Docker is one of the leading container orchestration Tools in today’s market Hi all I welcome you to this full course session on Docker and what follows is the complete crash course on the same But before we begin, let’s take a look at today’s agenda So we’ll start off with introduction to Docker where we’ll talk about what is talker its components and it’s architecture after that We’ll talk about how to install and set up docker on Centos Machine and on Windows later on in the session We’re looking to dockerfile and commands We will understand how to create and run a Dockerfile and use various commands after that I’ll talk about how to use Docker compose and Docker swarm so over here, you’ll understand how two runways containers to host a single application and also coming to talk, uh, swa– you’ll understand how to create a cluster to achieve High availability moving forward in the session will look into Docker networking We will understand the various aspects of Docker networking and after that I’ll talk about Dockerize An application so over here, you’ll understand how to categorize an application either it be an angularjs application a micro service application for the node.js application And finally I’ll end this session by talking about the differences between docker and virtual version and also comparing docker versus kubernetes right with that I come to an end to my today’s agenda But before we begin I would like to request all of you to subscribe to our Edureka YouTube channel to get daily notified on the top trending Technologies on that note Let’s get started Why we need Docker So this is the most common problem that industries were facing as you can see that there is a developer who has built an application that works fine in his own environment But when it reach production there were certain issues with that application Why does that happens that happens because of difference in the Computing environment between tech and product So I hope you are clear with the first problem I’ll move forward and we’ll see the second problem them before we proceed with the second problem It is very important for us to understand what our microservices consider a very large application that application is broken down into smaller Services Each of those Services can be termed as microservices or we can put it in another way as well microservices can be considered a small processes that communicates with each other over a network to fulfill one particular goal Let us understand this with an example as you can see that there is an online shopping service application It can be broken Goin Down into smaller micro services like account service product catalog card server and Order server Microsoft is architecture is gaining a lot of popularity nowadays even giants like Facebook and Amazon are adopting micro service architecture There are three major reasons for adopting microservice architecture, or you can say there are three major advantages of using Microsoft’s architecture first There are certain applications which are easier to build and maintain when they are broken down into smaller pieces or smaller Services Second reason is suppose if I want to update a particular software or I want a new technology stack Of my module on one of my so base so I can easily do that because the dependency concerns will be very less when compared to the application as a whole apart from that The third reason is if any of my module of or any of my service goes down, then my whole application remains largely unaffected, so I hope we are clear with what are microservices and what are their advantages? So we’ll move forward and see what are the problems in adopting This Microsoft is architecture So this is one way of implementing microservice architecture over here As you can see that there is a host machine and on top of that host machine there are multiple virtual machines each of these virtual machines contains the dependencies for one micro service So you must be thinking what is the disadvantage here? The major disadvantage here is in Virtual machines There is a lot of wastage of resources resources such as RAM processor disk space are not you Lies completely by the Microsoft which is running in these virtual machines So it is not an ideal way to implement microservice architecture and I have just given an example of five microservices What if there are more than 5 micro Services? What if your application is? So huge that it requires 50 micro services So at that time using virtual machines doesn’t make sense because of the wastage of resources So let us first discuss the implementation of microservice problem that we just saw So what is happening here? There’s a host machine And on top of that host machine there’s a virtual machine and on top of that virtual machine, there are multiple Docker containers And each of these Docker containers contains the dependencies for one microservice So you must be thinking what is the difference here earlier? We were using virtual machines Now we are using were Docker containers on top of virtual machines Let me tell you guys Docker containers are actually lightweight Alternatives of virtual machines What does that mean in Docker containers? You don’t need to relocate any Ram or any disk space

So it will take the RAM and Space according to the requirements of applications All right Now let us see how Dockers all the problem of not having a consistent Computing environment throughout the software delivery lifecycle Let me tell you first of all Docker containers are actually developed by the developers So now let us see how dark or solve the first problem that we saw where an application works fine and development environment but not in production So Docker containers can be used throughout the SCLC life cycle in order to provide consistent Computing environment So the I’m environment will be present in Dev test and product So there won’t be any difference in the Computing environment So let us move forward and understand what exactly Docker is So the docker containers does not use the guest operating system It uses the host operating system Let us refer to the diagram that is shown There is the host operating system and on top of that host operating system There’s a Docker engine and with the help of this Docker engine Docker containers are formed and these containers have applications running in them And that requirements for those applications such as all the binaries and libraries are also packaged in the same container All right, and there can be multiple containers running as you can see that there are two containers here 1 & 2 so on top of the host machine is a darker engine and on top of the docker engine there are multiple containers and each of those containers will have an application running on them and whatever the binaries and library is required for that application is also packaged in the same container So I hope you are clear So now let us move forward and understand Docker in more detail So there’s a general workflow of Docker or you can say one way of using Docker over here What is happening a developer writes a code that defines an application requirements or the dependencies in an easy to write Docker file and this Docker file produces Docker images So whatever dependencies are required for a particular application is present inside this image And what are Docker containers Docker containers are nothing but the runtime instance of Docker image This particular image is uploaded onto the docker Hub Now, what is Docker hub? Docker Hub is nothing but a git repository for Docker images it contains public as well as private repositories So from public repositories, you can pull your image as well and you can upload your own images as well on to the docker Hub All right from Docker Hub various teams such as QA or production team will pull the image and prepare their own containers as you can see from the diagram So what is the major advantage we get through this workflow? So whatever the dependencies that are required for your application is actually present throughout the Software delivery life cycle if you can recall the first problem that we saw that an application works fine in development environment, but when it reaches production, it is not working properly So that particular problem is easily resolved with the help of this particular workflow because you have a same environment throughout the software delivery lifecycle be devtest or product So I’ll move forward and we’ll see for better understanding of Docker a Docker example So this is another way of using Docker in the previous example, we saw that Docker images were used and those images were uploaded onto the docker Hub I’m from Docker Hub various teams were pulling those images and building their own containers But Docker images are huge in size and requires a lot of network bandwidth So in order to say that Network bandwidth, we use this kind of a book look over here We use Jenkins servers or any continuous integration server to build an environment that contains all the dependencies for a particular application or a Always and that bill environment is deployed onto various teams, like testing staging and production So let us move forward and see what exactly is happening in this particular image over here developer has written complex requirements for a micro service in an easy to write dockerfile And the code is then pushed onto the get repository from GitHub repository continuous integration servers, like Jenkins will pull that code and build an environment that contains all they have dependencies for that particular micro service And that environment is deployed on to testing staging and production So in this way, whatever requirements are there for your micro service is present throughout the software delivery life cycle So if you can recall the first problem we’re application works fine in Dev, but does not work in prod So with this workflow we can completely remove that problem because the requirements for the microservice is present throughout the software delivery life cycle and this image also explains how easy it is to implement a Microsoft’s Using Docker now, let us move forward and see how Industries are adopting Docker So this is the case study of Indiana University before darker They were facing many problems So let us have a look at those problems one by one The first problem was they were using custom script in order to deploy their application onto various vm’s So this requires a lot of manual steps and the second problem was their environment was optimized for legacy Java based applications,

but they’re growing environment involves new Acts that aren’t solely java-based So in order to provide these students the best possible experience They needed to began modernizing their applications Let us move forward and see what other problems Indiana University was facing So in the previous problem of dog Indiana University, they wanted to start modernizing their applications So for that they wanted to move from a monolithic architecture to a Microsoft Office architecture and the previous slides We also saw that if you want to update a particular technology in one of your micro service it is Easy to do that because they will be very less dependency constraints when compared to the whole application So because of that reason they wanted to start modernizing their application They wanted to move to a Microsoft with architecture Let us move forward and see what are the other problems that they were facing Indiana University also needed security for their sensitive student data such as SN and student health care data So there are four major problems that they were facing before Docker now, let us see how they have implemented Docker to solve all these problems Eames the solution to all these problems was darker Data Center and Docker data center has various components, which are there in front of your screen first is universal control plane Then comes ldap swarm CS engine and finally Docker trusted registry Now, let us move forward and see how they have implemented Docker data center in their infrastructure This is a workflow of how Indiana University has adopted Docker data center This is dr Trusted registry It is nothing but the storage of all Docker images and each of those images contains the dependencies for one micro Service as we saw that the Indiana University wanted to move from a monolithic architecture to a Microsoft this architecture So because of that reason these Docker images contain the dependencies for one particular micro service, but not the whole application All right, after that comes universal control plane It is used to deploy Services onto various hosts with the help of Docker images that are stored in the docker trusted registry So it Ops Team can manage their entire infrastructure from one single place with the help of universal control plane web user interface They can actually use it to provision Docker installed software on various hosts and then deploy applications without doing a lot of manual steps as we saw in the previous slides that Indiana University was earlier using custom scripts to deploy our application onto VMS that requires a lot of manual steps that problem is completely removed here when we talk about security the role based access controls within the docker data center allowed Out of University to Define level of access to various teams For example, they can provide read-only access to Docker containers for production team And at the same time they can actually provide read and write access to the deputy So I hope we all are clear with how Indiana University has adopted Docker data center So we will move forward and see what are the various Docker components versus Docker registry Docker registry is nothing but the storage of all your Docker images your images can be stored either in public repositories or in private repositories These repositories can be present locally or it can be present on the cloud Dhaka provides a cloud hosted service called Docker Hub Docker Hub as public as well as private Streets from public repositories you can actually pull an image and prepare your own containers at the same time You can write an image and upload that onto the docker Hub You can upload that into your private repository or you can upload that on a public repository as well That is totally up to you So for better understanding of Docker Hub, let me just show you how it looks like so this is how Dokken have looks like so first you need to actually sign in with your own login credentials after that You will see a page like this, which says welcome to Docker Hub over here as you can see That there is an option of create repository where you can create your own public or private repositories and upload images and at the same time There’s an option called explore repositories this contains all the repositories which are available publicly So let us go ahead and explore some of the publicly available repositories So we have a repositories for nginx redis Ubuntu then we have Docker registry Alpine Mongo my SQL swarm So what I’ll do I’ll show you a centralized repository, so The centralized repository which contains the center OS image Now, what I will do later in the session, I’ll actually pull a centralized image from Docker Hub Now, let us move forward and see what are Docker images and containers So Docker images are nothing but the read-only templates that are used to create containers these Docker images contains all the dependencies for a particular application or a Microsoft Office You can create your own image and upload that onto the docker Hub And at the same time you can also pull the images which are are available in the public repositories and the in Docker Hub Let us move forward and see what are Docker containers Docker containers are nothing but the runtime instances of Docker images it contains everything that is required to run an application

or a Microsoft Office and at the same time It is also possible that more than one image is required to create a one container Alright, so for better understanding of Docker images and Docker containers, what I’ll do on my Ubuntu box, I will pull a centralized image and I’ll run a center as container in that So let us move forward and first install Docker in my Ubuntu box So guys, this is my Ubuntu box over here first I’ll update the packages So for that I’ll type sudo apt-get update asking for password it is done now Before installing Docker I need to install the recommended packages for that I’ll type sudo apt-get install line x – image – extra – you name space – are and now a line irks – image – extra – virtual and here we go Press why? So we are done with the prerequisites So let us go ahead and install Docker so for that I’ll type sudo apt-get install Docker – engine so we have successfully installed Docker if you want to install Docker and send two ways You can refer the center is Docker installation video Now we need to start this darker service after that I’ll type sudo service darker start So it says the job is already running Now What I will do I will pull us into his image from Docker Hub and I will run the center waste container So for that I will type sudo Docker pull and the name of the image That is st OS the first it will check the local registry for Centos image If it doesn’t find there then it will go to the docker hub for st OS image and it will pull the image from there So we have successfully pulled us into his image from Docker Hub Now, I’ll run the center as container for that I’ll type sudo Docker Run – it sent OS that is the name of the image And here we go So we are now in the Centre ice container Let me exit from this Clear my terminal So let us now recall what we did first We installed awkard on open to after that We pulled sent to his image from Docker Hub And then we build a sin to waste container using that sent OS image now I’ll move forward and I’ll tell you what exactly Docker compose is So let us understand what exactly Docker compose is suppose you have multiple applications on various containers and all those containers are actually linked together So you don’t want to actually execute each of those containers one by one but you want to run those containers at once with a single command So that’s where Docker compose comes into the picture So let us proceed over to talker installation First I’ll make sure my existing packages are up-to-date So for that I will type sudo yum update And here we go So no packages marked for update I will clear my terminal now Now I will run Docker installation script for that I’ll type curl – FS sell and now I’ll give the link https Get dot docker.com /sh on here we go This script adds the docker da triple repository and installs docker

It is done now Our next step is to start a Docker service So for that I will type sudo service Docker start Here we go So darker has now started successfully Now I will pull a Docker image for Ubuntu operating system Docker images are used to create containers if the image is not present locally Docker will pull the image from registry dot half.com Currently, I don’t have any image So I’ll pull an image for Ubuntu operating system and for that I’ll use sudo Docker run on the image name dot is a boon to and here we go As you can see unable to find image I can highlight that at my cursor as well So just notice it is unable to find an image locally That means it is pulling from registry dot hub doctor.com So it has downloaded newer image for Ubuntu In order to start using container, you need to type sudo Docker Run – it and the name of the image, which is Ubuntu and here we go As you can see that we are in Ubuntu container right now I’ll open one more tab Over here if you want to see all the running Docker containers, you can type sudo Docker PS and it will display it for you So as you can see the name of images Ubuntu and this is the container ID for that particular image So why should we use Docker for Windows? Now? The first reason is that it avoids the work on my machine, but doesn’t work on the production problem All right Now this problem occurs due to the inconsistent environment throughout the software development workflow For example, let’s say that a developer has built an application Action on Windows environment and when he sends the application for the testing server, it fails to run now this happens because the testing server operates on an outdated version of Windows now, obviously the application does not support the dependencies needed to run on the outdated version of Windows So because of the difference in the software versions in the development and testing server the application will fail but when it comes to Docker we can run our application within a container which contains all the dependencies of the Equation and the container can be run through our the software development cycle Now this practice provides a consistent environment throughout apart from that It improves productivity So by installing dog on Windows, we’re running Docker natively if you’ve been following doctor for a while, you know that Docker containers originally supported only Linux operating systems, but later doctor made its platform available for other operating systems, but with a simple limitation now the limitation was that Docker engine ran inside Line X based virtual machine image on top of the operating system So basically you could run Docker from Windows or any other operating system except Line-X was still the middleman but thanks to the recent release Docker can now natively run on Windows, which means that Linux support is not needed instead the docker container will run on Windows kernel itself All right, so guys just like I mentioned earlier Docker for Windows suppose native networking now not only the Docker container the entire dock or tool set is now compatible with Windows This includes a Docker CLI Docker compose data volumes and all of the other building blocks for darker eyes infrastructure, which are now compatible with Windows but houses advantages now since all the docker components are locally compatible with Windows They can run with minimal computational overhead Now, let’s move on to the prerequisites So before you install doctor for Windows, you need to check if Running on a Windows 10 Pro Edition Enterprise education student Edition 64-bit system Now guys a point to note here is that Docker will not run on any other windows version So if you’re running on an older Windows version, you can install the docker toolbox instead Okay now doctor for Windows requires or type 1 hypervisor and in the case of windows, it’s called the hyper-v

Now, what is hyper-v hyper-v is basically a lightweight virtualization solution built on top Top of the hypervisor framework so you don’t need a virtual box You just have to enable hypervisor All right, and also you need to enable the virtualization in buyers Now when you install doctor for Windows by default, all of this is enabled but in case you’re facing any issue during installation, please check if your hyper-v and your virtualization is enabled now, let’s move on to the demo So we’re going to begin with installing doc of a Windows Now before we go ahead guys you have to make sure that you’re using a Windows And pro Enterprise education or student Edition one more important point to note here is that if you’re using a virtual box on your system, you won’t be able to run it because virtualbox will not work with the hypervisor enabled but in order for your doctor for Windows to work on your system, the hypervisor must be enabled so guys basically you cannot run Docker for Windows and a virtual box on the same system side by side Okay, so if you have a virtual box in your system, it’s not going to work because you Be enabling your hypervisor So let’s get started by installing doc of a Windows Now in order to install doc of a Windows You neither Docker for Windows installer now, I’ll leave a link in the description box so that you can download the installer So guys have already installed the talk of a Windows installer Y’all can go ahead and download it from the link in the description now here you can see that I’ve run the installer So now let’s just wait for the installation to complete, okay? Now let us click on Okay All right, so it’s unpacking files All right So the installation is completed So guys once you’ve installed it just open the doctor for Windows app Alright, it’s here on my desktop So when you try to start the application, you’ll see a whale icon on the status bar All right here you can see the way like in now when the whale I can become stable It means that Docker has started and you can start working on it Okay, so this icon needs to get stable That means that Docker has started All right So you can see him message popped up like this Okay It says Docker is now up and running All right, so guys you can either login to your Docker Hub account from here or you can use the dock or login command and login All right I’m going to go ahead and log into my Docker Hub account So now you all can open up any terminal and start running dog commands So guys I’m going to be using Windows Powershell now make sure you run as an administrator because there are a lot of commands which require admin access Okay So yes, all right Now in order to check if we’ve successfully installed Docker what we’re going to do is we’re going to check the version of Docker So the command for checking the version is darker space – hyphen version All right So it’s a returning the version of Docker that I’ve installed which means that is successfully installed darker Okay So now that we know Docker is successfully installed Let’s run a few basic Docker commands Okay So let me just clear the terminal Now I’m going to run Docker run Hello world Now This is the most basic Docker command That’s run Once you install darker Okay, so I’m basically gonna run the hello world image now Let’s see what happens So it’s unable to find image locally So it’s going to pull the hello world image from Docker Hub Okay All right So this basically gives a hello from Dhaka message So we finish the First Command now, let’s try something different Yeah So you use Docker images command to check The images that you have in your system since we just ran this hello world image from Dhaka hump We have this image in our repository All right Now, let’s pull a Docker image from Docker Hub Okay Now in order to do that, you just use a simple command called Docker pull and the name of the image that you want to pull on it So I’m going to pull an Ubuntu image Let’s see how it works So it’s basically pulling a 1/2 image from Docker hub Alright now let’s run this image So guys, do you remember that? I said that whenever you run a Docker image, it runs as a Docker container So whenever I perform this command Docker Run – ID – D and name of the image All right So whenever I use Docker run and I run an image, it’s basically going to create a container from this image Okay, so it’s going to create an Ubuntu container Alright now the next command is darker space PS – A now basically this should show all the containers All right So basically we have two containers over here because we ran both of these images All right, so whenever you run an image it runs as a container, that’s exactly what I told you earlier Okay Let’s clear this now

Let me type this out and then I’ll tell you what this does All right And what I’m doing here is I’m just accessing or running container Okay This is the container ID, which is basically the Ubuntu image that we pull some basically giving the container ID of this Ubuntu image that we put now basically within the container Okay, you can perform commands like let’s say Echo Hello All right So it says hello Now what you can do is you can just exit from here All right, so you come out of the container Okay Now, let’s try to stop a running container Okay Let’s see August top and the container ID All right, so it stopped that container Okay All right So the next command is Docker commit Okay Let me just type this out and then I’ll tell you what it does Okay So basically I’m using the docker commit command So basically it’s going to create a new image on the local system So after Docker commit, I have the container ID and I’m going to create an image out of this and after a space I’ve mentioned zuleika / abun to now Julia A car is basically the name of my Docker Hub repository and Ubuntu is the name of the image All right So let’s see what happens So basically we created a new image over here So here you can see that there’s another image which is added which is delay – Ubuntu Okay It has a new image ID and so on All right now guys, if you perform this command without logging in to Docker Hub, they’re going to ask you to log in first Okay, and for that you can use the command, which is Docker login All right now Did he logged in earlier in the session? So that’s why it says login succeeded Otherwise, it’s going to ask you for your credentials All right, it’s one ask you for your username and your password Okay Now what we’re going to do is we’re going to push this image to Docker Hub So we’re going to use a darker push command Along with the name of my Docker Hub repository and the image name All right, so it’s preparing and it’s going to push this image to Docker Hub All right Now, let’s say that you want to delete a container So what you can do is you can use the docker RM command So basically the command goes darker RM and the container ID Okay Alright Now, let’s look at our containers now, we have only one container So basically the container with container ID this got deleted Okay Similarly You can also remove Docker images Alright so first Let’s look at the docker image ID that you want to remove All right, let’s say I want to remove zuleyka Ubuntu Okay I’m just going to use this image ID And the command is Docker RMI and the image ID Now Let’s look at the docker images Now, you can see only Ubuntu and hello world is there so this is how you remove Docker images and I also showed you how to remove Docker containers So those of you who want familiar with Docker have a good idea of how simple Docker commands work Alright, so now I’m going to create a simple python web application using Docker compose Okay Now, let me tell you a little bit about this application It basically uses flask framework and it maintains a hit counter in redis So guys for those of you who don’t know what flask is it is basically a web development framework, which is written in Python and red is is an in memory storage component It is basically used as a database Okay now guys, don’t worry If you don’t know by Thin this program is very understandable So we’re basically going to use a Docker compose to run to Services, which is web service and red service Now, what is application does is it’s going to maintain a hit counter every time you access a webpage So each time you access the website or hit counter gets incremented Okay It’s simple logic just increment the value of the hit counter when the web page is accessed Okay Alright, so let’s begin with creating a directory for your application It’s always a good practice to have a directory with stores all of your code All right So let’s start with creating a directory Let’s say web application All right Now I’m going to change to that directory So guys have already typed out the entire code because I didn’t want to waste a lot of time So what I’m going to do is I’m just going to open up the files and I’ll explain what the code does All right, so I have all of my code written in notepad plus plus so I’m just opening up notepad Also guys, I want to tell you that you don’t have to install python or red is which is going to use Docker images for Python and redness Okay So first what you do is you have to create a python file Okay I’ve called it web app So I’m not going to spend a lot of time We are just tell you what we’re doing So first of all, we’re going to begin with importing the dependencies So we’re going to import real time we need red is we also need flask Okay These are the requirements that are going to import after that We just initializing name of the application So here we just hosting the database and we’re connecting to read is using the port number

six three seven nine All right This is the default code Then we Define the get hit count function this basically a returns a number of hits So we are also setting the read rise to 5 in case the page does not load while all of this holds true The incremented hits are returned And if there’s an arrow then we have an exception So we have also defined exception in case of errors this function is basically to display the hello world message along with the hit comes so this is the python file It’s very simple guys Very understandable You don’t have to be a pro in Python to understand This is very understandable Alright now, the next file you’re going to create is a txt File which are named requirements dot txt Okay now over here, I’m just going to add my requirements which is flask and redis So next we have the doc of file Now this talk of file is used to create Docker images Okay I mentioned this earlier in the session that you require doc of files to create doc images Okay So first we’re just setting the base image So we’re building an image starting with Python 3.4 now in this line, which is going to add the current directory into this – code path of the image Then we’re going to change the working directory to this path after this you’re going to use a packet manager of python to install the requirements that are mentioned in my requirements dot txt file Okay So these two were the requirements which is flask and redis And then finally we do setting the default command for the containers to python web app Okay, so it’s basically going to run my web app Now we finally have a Docker compose file Like I mentioned earlier that a Docker compose or a Amel file is going to contain all of the services So there is Web service over here and there is redis service So we’re basically running two containers over here or do Services over here, which is web and red is so now the web service is basically building the dockerfile in the current directory All right the dot signifies the current directory and it forwards the exposed Port 5000 on the container to the port 5000 on the host machine Now The red is service is basically using a redis image pulled from Docker Hub So guys, this was all about the files you need Create a web application file, which is a python file And then you have a requirements dot txt file Then you have to have a Docker file and a Docker compose file to run both of these services So guys now that I’ve explained the various files, what I’m going to do is I’m going to run both of these services or both of these containers by using the darker – compose up command Alright guys, make sure to create all of these four files and you have to create them obviously in the web application directory So if I do LS, I know that I have a Docker compose dot yongle file I have a dog of file I have requirements Dot txt And I have a web app dot python file Now Let’s use Docker – compose up to run all of these containers So just building from my doctor file So now it’s installing my requirements over here So now it’s running my web app dot python file now It’s creating two Services over here, which is web service and redis service So what I’m going to do is I’m going to look at the output by using kitematic So guys I told you earlier that kitematic is basically a UI tool for Doc of windows So just left-click on the dock icon over here and here you’re going to see kitematic Okay click on it But I think I’m facing an arrow I’m just going to go back to my files and see if I have missed out any line All right, so over here I have written RT This is actually import time Okay This was a simple mistake So let me just save this and let’s try and run this again now, it should definitely work I’ll just clear the terminal and we’re going to use Docker – compose up All right Now that’s what I’m going to do is I’m going to show you the output using kitematic Here you can see an option kitematic So click on this now It shows two applications over here, which are running one is the web service and the other is the redis service Now, when you go to the web service, you can see the output over here Let’s click on this So whenever you refresh the page the hit count increases So this is how the application works If you keep refreshing the headcount will keep increasing so guys, this was a simple web application and I also showed you all how to view this using kitematic Okay So now you can see that this is green, which means that it’s running All right, you can also be star the container you can stop it You can enter into the container and you can run a few commands Okay, you can use kitematic in a lot of other ways Let’s go about writing a Docker file First of all, your dockerfile is just gonna be a file Okay Just going to be a text file without any dot txt extension

Okay Your dockerfile will basically contain commands and arguments only and that is all that is needed to run Okay, these commands and arguments but additionally if you want to just comment something if you want to use bogus lines, then you can use it then you can write it by using this hashtag over here Okay So technically it might involve you having commands and arguments Okay So Mike imagine arguments are the ones which are going to help me customize my Docker image and the commands are something which I can write for my explanation Okay So if I #over your then whatever comes in that particular line after the hashtag would be ignored So if I say print welcome to enter a garden, I’m just giving a sample here So this line will be completely ignored and not executed But however in the second line if I have run Ecco, welcome to Erica, then this line would be executed Okay And in this case, I have my commands and arguments run is going to be my command and Echo welcome to enter Rekha will be my arguments so I can have argument one I can have argument to I can have argument three and many more Okay, but by default your arguments would be just too okay I will have one command and then two arguments Okay, so let me go into more details of these things and by details I want to talk about the different syntax that I can use your the different functionalities or the different commands that I can use Okay So let me start off by talking about the most important command which is nothing but the from command so from is the most important command because without the from command you cannot write a Docker file because the from command is what is used to specify a base Docker image Okay in my case I was specified your Ubuntu which means that I will be using an Ubuntu as my base Docker image and all my customizations will be on top of my Ubuntu image Now think of it very much like you working on a server or you working on a Linux machine Okay, you have an Ubuntu machine with you and then if you want to execute or deploy your application on that particular machine of yours, you have to install everything, right? So you’ve not done the other steps though, but so far by using a from Ubuntu it means that you have an Ubuntu machine with you So this is just the base image, which can be equivalent To you just having an open to machine Okay, and what do you do after that on to that particular Docker image depends on the other functionalities and then moving on to the next command is the Run command Now, this is again, I would say the second most used command because at the end of the day if you want to run a particular image or if you want to run a particular command, then you use this run command in my case if I have an open-door image on if I want to install say Java or Jenkins or react or curl then I will be using this run command Okay, so I have my run command and then my argument Would be app get install with a yes flag I’m saying react or Jenkins or whatever Okay, so that’s what my run command does It’s basically for executing any come out of mine, but it has a slight difference when compared to CMD Okay, because run is used to run a command Okay, it can be a command which is it could be a shell command or it could be a command which basically runs my image into a container Okay, and that is what the difference is with respect to CMD with CMD you again can execute A shell commands like I’ve done here I can say CMD Echo Welcome to edu Rekha, but however, I cannot use a CMD command for building my Docker image Okay, so I cannot execute my Docker image or I cannot build my Docker image with the help of the CMD command So if I want to ask you to come out of my shell I can you either run or CMD and if I want to basically build my documents, then I can only use run in such places CMD don’t work Okay So moving on the next important command is the entry point command Okay, the entry point command is basically used To basically override whatever function your CMD command does or the entry point basically suggests that when you’ve finished building your Docker image, then the command which is specified with the entry point that will be the one which will be executed first when you run the docker container of that particular image, right so I can build a Docker image which has this entry point Come on and my Docker image will be built and when I execute that particular Docker image, then the command which is specified with entry point will be the first And to be executed, okay, and the additional functionality that entry point has is the one which I already said, which is nothing but it can override your CMD command So take for example over here So here I’m saying CMD, welcome to Ed Eureka Okay, and here if I say a three-point Echo then my entry point Well basically overwrite this because most of the time you are CMD command would be the first set of commands We should be executed in your dockerfile Okay, you can have a lot of things but in your CMD command you will have some set of arguments present over here So This case I have one command and then one argument but with my entry point, if I say entry point Echo, then this would be used as my argument to execute this argument of mind Okay, so that is the whole point of entry point And this is the subtle difference between entry point and CMD entry point can basically override your CMD commas So next comes the add command now the add command or the copy command These are cons which can be used interchangeably

because the add command is used to copy whatever files which are therein One particular directory to another directory Okay, so it could be copying files from my host to my container Okay So I’m seeing add and then I can just specify the path of my source after that for the space I can specify the path of my destination to where I want to copy my files Okay So this is also pretty self-explanatory and then the environment command now if my application needs a particular environment variable then then I can specify to my Docker container that this application needs certain environment variables and this environment variable is present So an example of this could be if you want to execute Java program, then you need Java right and you have to set your environment variables so I can specify my Java environment variables like this in turn my Docker container So my environment would be my command and these would be my arguments So server Works would be my argument 1 and this would be my argument to alright, so that was one example, and then the next important command that you have to be aware of is the working directory command in your Docker container a lot of times you would Would want to go into a particular container and then start execution inside that container, especially when you want to execute certain commands in the Shell, right? So if you want to use the CMD command inside your dockerfile, then you want to basically execute a particular command on the shell, correct? But where exactly do you want to execute that command because these commands will be executed from inside the container and inside the container if you want to customize the place by you want to execute that command if you want to change the place where the CMD command will be executing its arguments then you have to say The working directory over here So you will say working directory and you’ll just set the path over here And then whenever you have a CMD command, which gets executed then that CMD command will be executed in this particular path Okay, so pretty simple, right and then we have the Expos command and the Expos command is a very important command in case of front-end applications because so with the Expos command you can specify a port number and you can specify that this application would be active on this particular port number inside the container Okay And yeah, this will be the one which is running inside the container and however, if you want to execute the same particular application and you want to run on a particular port number on your host, then you have to do the port mapping but that comes later on but inside the dockerfile, this is how we specify that and remember this is going to be only specific to your container And this port number is only going to be used from inside your container The next thing is the maintainer command so it’s not a very technical thing But if you want to tag your name along with the image, which you are building then you can use this Not to specify who’s the person that’s metering this particular Docker images before you approach the docker Hub And then that way whoever uploads or downloads your image from the doctor up will know that okay This is the guy that basically built your image Okay, so we can just set your name over here And this has to be present only after the from command That’s the point which you have a node and then we have the user command and if you want a particular user to execute or to run a container, then you can use this user command and specify the user ID of that particular user whom you want to acute the docker container Okay, so it’s pretty simple, right? So the user here is my command + 7 5 1 is the argument and this particular user who’s having this uid will be executing that particular Docker container of mine And then we have the one last comment that we are going to talk about which is nothing but the volume command So this volume command is basically used to set a custom path where your container will store all the files So this is the place where all the files related to your Docker container will be present and even if you want Containers to share the same path then you can use this volume So this path it can be shared by multiple containers So logically if you have multiple containers which are hosting the same application, then you might want them all to use the same path right where it’s stored So this is the path where it can be present So that’s it And now let’s move on to our demo And first I will show you how to install your Apache web server and I will show you how to write a Docker file Okay So in the first demo of mine, I have a simple dockerfile when I’m first all using an Ubuntu image as my base image and then I’m saying maintainer is at Eureka and then I’m running a few commands Even if you’re trying to install Apache on your local machine on Ubuntu, then you will have to probably run these commands will offer do an AB get update this basically updates my Advocate repositories Okay, and then you’ll have to mainly install your Apache service So the command for that is app get install Apache where in your Apache will be downloaded from your app data repository and then you will want to clean your object repository So you’ll use the app get clean command And most importantly we are deleting this particular path Okay, so you will have these files which are there in this particular path We’re live apt lists Okay, so whenever you use an app get update and if you get an error that time then that’s because of the files which are present in this particular path So to avoid any error that comes in the future we are deleting whatever is created over here Okay and RM – RF is what is used for that and our run command is what performs all of these so I have up to four functions

or four commands which need to be done And I’m using one run command and using an and over here Okay, and a percent to say that I have multiple commands which need to be run So that’s the thing and for my apartheid work after set my environment variables and that’s what I’ve done here So it’s pretty simple and it’s the same as the installation process It’s just that I’m setting it manually insert the dockerfile on my own Okay So for Apache run user for Apache run group and for Apache log directory, there are various parts where it has to be present and that’s what have a specified Arguments over here So these are my first arguments and these are my second arguments and then I’m saying expose T Which means that on port number 80 my Apache service would be hosted Okay, but remember this is only from within the container Okay, if I want to access it on my host machine then after the port mapping while starting this particular container of mine, so in my inside my container on port number 80 Apache will be present and finally if I want to start this Apache service, then I have to go to this particular path and then after Art that apache2 service right? I’m doing the same thing over here using my CMD So using the CMD command I’m saying go to this particular slash user slash sbin slash apache2 and I’m saying execute this and run it in foreground mode So – D is the flag, which we have to specify and then I’m saying foreground to basically get the UI up and running and to get it hosted Okay now to show you the same demo Let me open up my virtual machine where I have prepared this Docker file So this is my VM I hope you all can see my VM over here Okay, so I’ll just open up my terminal and I’ll bring up my Mozilla Firefox Okay, so let me do an LS and then I have my documents folder right? So let me do CD documents and I let me do LS so I have dockerfile here Let me do cat Docker file and show you that I have the same code present over here Okay So what I explain right now as to how to install Apache and then use the various commands I have Copy that same code into this particular dockerfile of mine Now The first thing after do is build a Docker image, which is going to be my custom Docker image out of this Docker file Okay, and the second thing after do is to run that particular Docker image into a container All right So let me get started with the first thing So if you want to basically build a Docker image from your dockerfile the command is Doc a build – t and then you have to specify the name of your Docker image Okay, so I’m going to say my Apache image Okay, and then I’ll just say the place where the docker file is present by mentioning period so by mentioning period it means that the dockerfile can be present in this particular directory and based on that dockerfile This Docker image would be built So let me hit and oh and just wait for the Viennese steps to be performed Okay, so step one step two step Three and then all the different steps, which I specified in semi dockerfile are being executed one after the other So my first step here is nothing but from Ubuntu which means that I’m pulling a base Ubuntu image that is present over here And then I’m saying step number two make a dareka as the maintainer and then step number three bottom installing various functionalities Okay So let this complete Okay, I think this part can be forwarded and moved ahead Okay, so I think all the steps have been executed successfully because I’ve got this message right successfully built and the idea of my Docker image So if you intermittently see step for executed step 5 executed step six step seven and step eight everything I’ve been executed So my Docker image has been built and then I can verify the Same by running this command Docker images Okay Let me say pseudo Docker images and as you can see here my Apache image with the latest tag hasn’t built Seconds ago All right, and this is the size of this particular Docker image of mine Now, let me use this Docker image and bring up the docker container out of this image And the command for that is pseudo Docker run and now up to specify the port number because inside my Docker file and specify that the application has to be active on port number 80 and if I want to access that application on my host machine then after do the port mapping Port mapping of my host port to my container border, so let me I say – p and say 80 colon 80 So this means that port number 80 of my container will be mapped to my port number 80 of my host Okay So first comes the host then comes the container and after this I can just simply specify the image which I want to build right so I can say the name of the images might Apache image and I can also give a name to my particular container I can say – – Game equal to app one

Okay, so I can give enter and yes, so ignore this message But anyways, my Apache servers would have been installed So let me just go here And if you remember it was port number 80 where it was hosted right? So, let me just type in localhost Colon 8080 and yes, it says that it works This is the default page for the server and the server is running but no content has been added yet That’s because I have not Not done anything manually, but it’s just that have hosted the same service which I got This is my party service which I have installed Okay, so my service is running now and I can verify that from a different terminal So let me just go here and say Docker PS, okay So dog appears and you can see that my Apache image was the name of the image And then the name of the container is app1 and this has been continued rise and it’s basically created these many seconds ago right now if I want to stop running the service I can either stop this container over here I can run a command to stop the container or I can simply use a control C And with that I’m out, right this container is not being executed anymore So this is a shortcut but it’s not advisable Either the command to stop a container is Docker stop and then container ID So I will show you how to do it with the second demo Okay, but let me just go here and verify that again So if I refresh this then the page is not accessible anymore That means my container is not running and hence The server’s not working So that’s the end of the first demo of mind which shows how to install and how to install Apache Okay So let me just do a sudo Docker PS – A over here and show you that the same container over here with the same idea Has exited okay and let me clear the screen here and over here too Okay, and then get my second demo So my second demo is all about installing engines So again to install in my engines server, I’ll follow the same steps Okay, at first for all users are going to base image and I’ll be installing my answering service on my Ubuntu machine So that’s why I’m doing from Ubuntu and then I’m specifying maintainer at Eureka and then similarly I’m using or are running the command Run apt-get update run apt-get install – why and drinks and then I’m doing add an index dot HTML Okay Now first of all, let me tell you that with respect to the previous demo I ran these two commands on the same line correct with an ampersand here I’ve just divided into two lines So it’s just to show you the functionality and the shortcut which are used in the previous demo Okay, but otherwise, it’s all pretty much the same and then what is new here is the index dot HTML because with engines this index dot HTML is Created by default So I just created an index dot HTML file and then I put my own code in that index dot HTML file and that is what I’m putting inside my container over here So if you remember the add command basically copies, what is there in one path to the destination path? So this is my source path, which is my host path And this is going to be my container part so index.html, which was there in my same folder that is copied inside my container So there is engines inside the user / – are okay So inside that there’s another folder called HTML and inside that folder the index.html file will be copied and once it’s copied over there from here I’m using an entry point command so that whenever my container is running right, so I have my Docker image and then when I execute the docker container, then this line would be executed So these will be built though All the environment would be set up over here But this command slash user slash sbin slash engines So this is the service which needs to be started so my doctor is going to particularly Go to this particular path and then start my engine service by giving the flag – G and Demon off So demon of your basically helps me bring my application for the foreground Okay So if it’s demon on then the application will be running in my background Okay, but since I was specified demon off over here and because I’ve specified demon off and brought it to my foreground I can see the UI and I can only see the UI if I say the particular port number and that is what I’ve done in my final line absurd expose port number 80 again, so if I have said exposed port Number 80 it means that in my container is going to be hosted on port number 80 and I can map this to my host port in my run command Okay, and when I run the command I’m going to repeat again when I run the command This would be executed on this was what brings up my engines service Okay So let me go back to my terminal and show you the file But however, it’s not in the documents folder So let me go back and go to my downloads folder Okay, so here I have my index dot HTML file and then I have my Docker file for Roaring engines So first, let me do a cat dockerfile So it’s the same set of code, which I explained few seconds back and then let me also do cat index dot HTML and this is basically my HTML code

which will be displayed on my UI So the title of my page is going to be a direct cause Docker engines tutorial and then in h tags, I have a hell of a trick are loners and then I have a P tag where I was specified something So this is the back end of HTML file and this is how any HTML file is built, right? So I’ve just copied it and I’ve pasted it So this is how the backend HTML of any web page will look like right So I’ve just created that and hosted I actually had it on my machine and then I basically put it inside my Docker container and then I’m going to start the engine service when I start the engine service this index dot HTML file will be picked up and be used as the default page or the first page which comes up in my view I okay So let me clear the screen and first of all execute this dockerfile now to build the doctor made out of this dog The command is Docker build – tea and then after specify the name of the image Let me say my engines image And then after this, let me see the path with the docker file is present and I can do that by specifying Dot and let me go ahead and also specify pseudo Okay So my first tip executed Second Step also executed and so is my third step and let’s just wait for all the steps to be executed so that my Custom Image is built and trust me This is my custom Ubuntu image, okay Okay, so that was my bill command And if I want to execute or bring up the container out of this particular image of mine, I can use the command Docker Run – PL specify the port number barrier to be active and let me again say 80 colon 80 followed by the name of this particular container I can say name is equal to app to and then I’ll just specify the image which I am going to use So my And drinks image So this is the name of my image, right and however after also specify pseudo over here, so if I had enter my container would be active and since I’ve specified entry point Basically, it would go to that particular path and start my service So let me just go to localhost and check if that’s working Okay, I’m going to say localhost 8080 and yes, this is my ending service Of course It’s a little different from my Apache service and I’ve customized this one to say that this is my page title To iterate cause Docker engines tutorial and then I have a specified Hello at a record low nose And then this right this is what I also showed you some time back in that index dot HTML file So this time let me show you how to stop this particular container by not doing control C, but by actually stopping your container in a healthy way So let me open up the second tab over here and over here Let me say pseudo Docker PS This would first fall lists down there Regular engines image of mine Okay This is the container ID So I’m going to copy this container ID and then stop this particular container I can say pseudo Docker stop and then container ID and my container would have stopped by now So if I go back to the other tab, you can see that I’ve got control back here, which means that my application is stopped being deployed So if I refresh this page you can see that I do not have access to the page anymore, right? So that’s how you host any application of yours And that’s how you bring it down with the hell Of your containers, okay in some of your fingers you can get anything done and that’s why doctor is really good and really useful commands that you see on your screen here the other ones which are most commonly used So if you are a develops engineer or if you’re just someone that’s working on Doc Ock then you might have already used these commands or you might use them in your future Some of those commands are darker version doctor helped broker pull Docker run Kaka build Docker log in Dhaka push Docker PS your pH stands for Docker processes And this command is used to see what are the active containers currently and then we have Docker images Then you have doctor stop go kill There is Docker RM which of course stands for dr Remove Docker RMI, which stands for remove images we have Docker exec and this is used to access the bash of any active container and then we have dr Commit We have doc or import Docker export the upper Container Docker compose Turkish warm and Docker service So these are the 20 plus Docker commands, which are most commonly used now without wasting much time Let me get started and discuss each of these commands darker version This command is used to find out what is the version of your Docker engine? Okay So remember there will be two flags that will come in before writing version and then we have another command which is Docker again to flags and then help now This is basically used to list down all the possible That you can use with Docker So here Docker will be a parent command and whatever child commands

that are possible here as permutation combinations Those would be less down Now Let me quickly open my terminal and execute these two commands for you Do remember that I will be using my Linux virtual machine Okay, and and this Linux virtual machine of mine is an open to machine and it’s hosted on my VM Like I said, so it’s going to open my terminal over here and the First Command that We were supposed to execute is darker version, right? So as you can see the version of my doc origin is 17.0 5 Okay, so that’s how this command works Now the next command that we were supposed to execute is Docker help that of course, we’re also come with two hyphens and like I told you there are various commands that you haven’t talked up like dr Attached Docker build talker Comet, dr CP dr Create Docker deaf So all of these Todd the other child commands that can be used with Daka Okay as a primary command So I hope that was clear and at any point of time if you people have any doubt with respect to the usage of any command in da core, then you can just use the help right? I’ll help will basically tell you the different commands are there along with a description? So it’s also explain what each and every command does now, let’s say you have Docker a built then you can see the explanation that it says build an image from um a Docker file, right? So that’s a good enough explanation If I was a guy that’s working on Docker then I would know which option to use right similarly for everything So for Docker RM, it says remove one or more containers and then for Docker for DACA start, it says start one or more stopped containers and many more So whenever in your free time, you can use the docker Health command and see what are the different commands possible along with their explanation Okay, so I am going to clear the screen and go back my PPT Check what are the next set of commands that I can execute and remember these are all still basic Docker commands Okay So the next command is Docker pull Now the docker full command is used to pull any image from the docker Hub Okay, and then we have Docker images command, which of course list down all the images in your local repository Now in the previous command, we do a Docker pull, right? So for the first time you will not have any image in your local repository You will have to pull it from your Docker Hub, and when you pull it from your Docker Hub, it gets stored in your local repository And once it is there in your local repository, you can run the docker images command and then check all the different images So all the images would be listed down Okay, so that’s about these two commands and then we have Docker Run Come on Now the docker run command is basically used to execute that image and I’m pretty sure you are aware that whatever you download from the docker Hub our images right and if you Running instance, or if you want it to be active then you have to run it because what you will have to deal with they are containers, right? I’ll to get containers running then you have to basically run those images That’s the same thing that we are doing here The Commander’s Docker run along with the image name So supposing I am pulling it Ubuntu image from Docker So I will be using this command Docker pull Ubuntu Okay, and if I want to execute this image and get a running continue Rod of it then I would have to basically go here and run the command Docker run along with that particular image name Docker run Ubuntu Okay guys, so I think you have a decent understanding of these three commands Now, let me again go back to my terminal and execute these three commands and show you how they work So I’m back to my terminal here Okay So here let me write down the command Docker pull Ubuntu Now by running this command I am pulling the latest Ubuntu image from my Docker Hub Okay, so, Hit enter in spite of the fact that I did not specify any tag over here as late as it’s pulling the latest image that is available on the docker Hub Okay So let the process happen guys Give it a minute Perfect So now you can see the status here, right? It says it has downloaded on your image for Ubuntu that is with the tag latest Now if I want to check if this image is actually been pulled then I can run the command Docker images now, let me run that command by fostering the screen and then actually running the command Docker images when you hit enter, like I said, you have the entire list of images available in your repository over here The entire list is down over here Like so you have customer made you have rather than S / Custom Image, right? So this is another image which I created if you want to check if your images latest, then you look at it Ubuntu here, right? So this has a tag as latest and this was an image which was created 10 days ago in my local repository and it is about a hundred and 12 Mb

Okay This is the one which we downloaded recently and it has the latest tag So this is how you check the different images that you have Have in your local repository guys Okay, so I’m going to clear the screen and now it’s all about executing a Docker image So for sample purpose, I can even run any kind of Animation get a container, right? So before I execute an Ubuntu image, let me execute a simple hello world container So for that I’m going to say Docker run Hello world Now remember when we say Docker run hello world You might ask me a question That is Hello World already present in my life Repository Well, the answer is it’s actually already present So I have an image of hello world in my local repository But even if I do not have the hello world image in my local repository this command will run because when you do a Docker run command, this would first of all look for this particular image in your local repository If the image is not present then it will go to the docker Hub and look for an image with this particular name and it will pull that image with the latest tag Okay, so run does two things As it pulls and it executes Okay So let me hit enter and there you go It says hello from Docker, right? So this is the hello world container for Docker Now the reason I did not execute the Ubuntu images because I want to make a few modifications to that image But if you want to make a few modifications to that image, then you have a different set of commands which are involved So let me go through those commands and then get back to what I was supposed to do that was about Docker run and then we have something called as Doctor Built Okay, and this Docker build command is used to build a custom image of yours supposing you have a low bun to image Okay, but you do not want it exactly as it is and you want to make a few adjustments to that So one other example for that would be the note image right in my previous sessions have had sessions on Docker swarm had a session on Docker compose and many more right so over there what happens is I’m using a node.js image as my base image and then I’m building my entire application on that At so what you had your risk? You have a base load image? Okay, and on that note image, you build your entire application impede an angular application or beat a mean stack application and the command that you use to build the entire application is the docker build command And as you can see, this is the syntax we have to say Docker built with the flag – tea and the tea flag what it does is it basically tells you that you can give your name with a tad Order our image with your building because this image is going to be your image right your customly building this image So when you custom build this image, you can give it your own name and that’s what this is and followed by that with a space I have specified a DOT here now the dot specifies that the dock of file which is needed to build This Docker image is present in the current directory where this command is being executed Now, how do I specify the entire path of my dockerfile then? I didn’t I wouldn’t be Be specifying the dot over here, right? But in that case if I’m specifying the entire path then that means that my Docker file is present and some other location not necessarily in the same location where the command is being executed Okay I hope that was a little fear you people so now if you’re still not here, let me give you a demonstration and then you will be able to understand this in a better fashion Okay So let me open my terminal again and currently we are in the slash home slash iterator directory now for the demo purpose I had created a new Docker file Let me first open and show you that dockerfile Okay, and that Docker file is present in the downloads demo folder of mine If I do an LS, there is a dockerfile perfect So let me say cat dockerfile In fact, let me open this in G edit So pseudo G edit dockerfile Yes Now the dockerfile is the most important file if you want to build your own custom images because whatever you want for the application to run those dependencies are Fide in this file We have the same which is the base image that you have to first of all download from the doctor up and use that as a basis where application and then you have to say the other commands that you want to run now in this demo of Mind simply downloading an Ubuntu image from the docker Hub, and I’m just echoing this sentence Hi, this is version from Ed wake up So it’s a very simple process right? I’m pulling one able to image and I’m doing an echo on that particular image so you can just save this closest Profile and then execute this particular dockerfile Okay And since I am in this folder I can use the dot to specify that the docker file is present in this directory Now, let me first clear the screen and then run that command again So the command is darker till – tea let’s give the name of the image

as my custom Ubuntu image custom Ubuntu Well, that’s good enough, right? And then I’m going to say dot because the dockerfile to build this my customer been to image is present in the same path Okay So it says my customer going to should be in lowercase Okay, no problem So, let me just check my dockerfile once okay Now the reason I got this is because my image name cannot be in caps So what I’m going to do is let me read on the command with a different name possibly in small letters My customer going to okay, perfect the command got executed So if you can see here, it says selling the build context to the doctor demon and since I had specified only two steps in my dockerfile those two steps are being executed here Step One is it’s pulling the Ubuntu image from the docker Hub And since it’s already there in my local repository It’s using whatever is there Okay and step two is running the echo statement Hi This is what in from Federica, right? Right This is the second step and the same Echo Command has been executed over here Hi, this is Worden from Ed Wake up, correct? Perfect So I hope you guys got a good understanding of this particular command because this is the most important command if you want to make it as a devops engineer or a person that’s regularly working on Docker because all of the images that you will be working on in your office or in your workspace You will have to be working on custom images for your application I remembered how this command is used and how the applications are bit So let me just clear the screen and go back to my slides and see what is the next command in store for us Okay So the next command is the docker container come on and this Docker container command is basically used to manage your containers Now, let’s say you have a number of containers and because so many containers are active at the same time your system may be lagging right there’s a performance issue So at that time you might want to close or end certain containers Right kill their process So at that point of time you can use the container command and kill the container straight away So it’s just one of the different options that we have So there are a number of other commands which can be used with Docker container as The Parent Command and I would request you to look up the set of commands on Docker docks Okay, but for now, let me just go back to my terminal and execute one of these commands and show you how they work So let me go back to my terminal here and here I’m going to run that Come on Docker container and let me run Docker containers logs Okay, but so here Let me run the command Docker container logs to basically find out the different logs that are associated with my container Okay Now the thing is in arguments after specify the container name or the container ID And since I don’t note right now then we first find out what is my container ID Okay, so I’m going to do a dock of PS command To list down the different containers Okay, if there are no active containers, so I’m going to do a – a flag So these two commands I will explain in detail at a later point of time guys Okay, but anyways getting back to our problem here, you can see that the hello world container got executed, right? So I want to copy the container ID here And now I’m going to find out what are the logs of this Docker container logs And then I’m going to paste the container ID this way Whatever logs Generated for this container Those would be displayed perfect worked as with the container executed again So the same thing can be done for any of the other containers Okay If I do a Docker PS – A and C There are so many other containers which are there right in my system I can copy the container ID of any of these and I can execute the same thing again and again, Docker container logs, right and then I can paste this So this time the logs of this particular container, which is nine months six and this entire ID This logs have come out and like I said with Docker container, you have various other options, correct? You have options like Docker container kill, you have Docker container remove and all those things so I can use a Docker container remove and hit enter And basically when I do that this particular container has off so if Remember the CCC right? This container is the hello world container And when I said RM this container is removed So if I go back and do Docker PS – A then the first entry for the helloworld container would not be present And yes, as you can see it’s not present, right the hello world container is not present here Now That’s what I’m going to show you So we’re clear my screen and now let me get back to my slides So I basically executed the docker container logs command

And the docker container RM command, so you have various other options Like I said, we have the container kill which can be used if you want to kill any one particular container Okay, you can use the docker container run command to start any container which has been temporarily stopped or which is inactive Okay, and if you want to again start the container from something that has been stopped you can use the docker containers start from at and these are just a few of the commands and the entire list of Docker container Runs can be found in Dr. Dobbs Okay, so I would request you to go to doctor docs and then see the entire list of commands If you want to learn more about this command in the meanwhile, let me go to the next slide and country with our session The next command that we’re going to talk about is the docker log in command Okay, and as simple as it sounds this is used to log into your Docker Hub account can any of you guess why we would need to login? Well, it’s for the simple reason that you might want to push any of your image that you have created locally, right? So when you’re working with a team who are all using Docker, then you can just pull the docker image or create a new Docker image from scratch at your end and build a container And if you want to share that container with other people in your team, then you can upload it to Docker Hub, right? So, how do you upload it to Docker Hub? So if you want to upload it, you don’t have any other work around so you do it through the terminal and to do it through the I know you have to first do a docket login Once you have logged in using your Docker container credentials, then you can simply start pushing your Docker image to the docker Hub Okay, so that’s why this come on is really important So let me go to my terminal and show you this command the command is dr Log in when I hit enter it says login with your doc ready to push all images from Docker Hub If you don’t have a doctor ID, it says head over to this website So this is where you can create a new Docker ID, okay And the username it says in Brackets it says what ananas that’s my username because I’m already logged in So I’m just going to hit enter without entering the username again and the password I can enter is my password so that of course I’m not going to reveal to you people But once you enter the password and hit enter then it says login succeeded, right if your credentials are a match then you are successfully logged in and once you’re logged in you can start pushing your Docker images, which you work down low Lee do your Docker Hub? Okay, perfect Right So let’s clear the screen and get back to our slides now Like I said, the next command is basically the push your Docker image to your Docker Hub Remember the command should have your doctor ID / the image name? Okay, my Ubuntu image This may be the name of the image that you might have created locally Okay, but if you want to push it to the docker Hub, you have to tag it with a name and that name should be your doctor ID Okay, so let me get to the terminal and show you how this command works So let me first look for the image that I want to upload to my Docker Hub Okay So when I hit Docker images the list of all the images come out and if you remember my customer Boon to is the name of the image, which I created now, let me try pushing this image to the docker Hub Okay, so I’m going to copy this and first clearing the screen and here I need to tag this image with my dog Writing right because right now it has the name my customer going to and I cannot upload it to Docker Hub with this name now since I have to tag it with my name, there’s a command called Docker tag and here you have to specify what is that which image that you want to tag? So the images my customer born to and here let me specify my Docker ID / the image name, so I’m going to save Warden NS Okay Now that’s my doctor ID and Slash Mike custom Ubuntu image, right? So this is the name of my image I can even change the name, but I’ve just retained my custom open to as a name of my image So when I hit enter this image would be getting uploaded to Docker hub And now this image has been renamed to what the nest / my custom open to we can verify the Same by running the command Docker images and as you can see here, there is there is one image with the name Mike customer 1 2 and then there is another image with Walden NS / my customer burn to correct Now This is what I have to upload So now I can use the docker push come out So I’m going to say Doc a push and then simply specify the image that you want Doc a push-button lettuce / my customer going to hit enter and the image would be getting uploaded to Docker Hub And once when you do it from your end

after this command is executed successfully you can go to your Docker Hub and check that your image, which you created locally has been uploaded to the doctor about it can be shared and access by other people Okay? Okay, perfect So this shows that my image has been uploaded and let me just clear the screen And get back to my slides and move forward and this command is something that I already excluded some time back Right if you remember I use the docker PS command to identify which are the containers which are currently active in my system right in my doctor engine So that’s what this does PS basically stands for processes And when you hit Docker processes, then all the container processes, which are currently running in your dock origin would be listed However, if you append this command with a a flag, right? Then all the containers which are inactive even those containers would be listed down So that is a difference between these two commands Docker PS and Docker PS with a flag a now Let me go to my terminal and show you that so Docker PS first Okay, and right now there are no entries because there are no containers which are currently active But if you want to find out all the containers irrespective of whether they are active or whether they are not active then it would list down all the containers in my system Right or in my host and that’s what it’s going to do Docker PS – name and as you can see there’s an entire list of Docker containers over here There is the customer Mage which I created and then there are various other images over here, which I used to build a container and I’ll show you how they work in my previous sessions So the contact list angular and then there is a demo app one These were images which are used for my Dockers swamp and for my Docker compose videos respectively, so if you want to go and see those videos And the link will be there in the description below guys and I would request you to go through those images to understand other Docker Concepts better Okay, because dr Campos and Docker swamp, they are the advanced concepts and Docker and that’s a must know if you want to make it as a doctor professional the link for those videos are in the description below So let me just clear the screen and get back to what I was doing So the next command that we have is the docker stop command now the Dockers top commanders basically used to shut down any container So if There’s any container in your Docker engine which is running right in your host And if you want to stop it, then you can use this command and do note that This command would not be shut down right away It might take a few seconds because it would be graceful shutdown waiting for the other dependencies to shut first Okay It’s not a force stop It’s a very gentle stop That’s what this commanders but we have something called as a Docker kill command Okay and what this doctor kill command does has it ungracefully stops your container as if there is Container that is actively running it would straightaway kill it in spite of its something similar to for skill, right? So that is a difference between these two commands Docker stop and Docker kill kill would straightaway kill your command now before I show a hazard of this, let me go forward and talk about a few more commands There is something called as a Docker remove right Docker RM this one what it does is it removes a container at this point of time you have to remember that if you want to remove any container from your host you have to First stop it and how will you stop it by the two commands that I explained in the previous two slides you either for skillet, or you kill it gracefully using the docker stop command or the locker kill command and once you’ve used those two commands, you can remove them from your repository Okay, and we have another command That is the docker RM I okay So the doctor Adam would remove containers, but if you want to remove images itself from your repository, then you can use the docker RMI command Okay guys, so these are the four different Enter commands that we have your which is are regularly used Now Let me open my terminal and show you how they work first Let me do a Docker PS and since there are no containers which are currently active What I’m going to do is I’m going to start a service Okay, I want to containerize a particular service and then I will show you how to stop it or kill it or remove it Okay There is one particular image demo app one Okay, which I use to deliver my previous session There was the docker compose session right over there I used that particular image and I created an angular application So I’m going to first start that service and the command for that is Docker Run – – RM I want to say port number is for to double 0: for to double zero because it’s an angular application Let’s give it a name It’s – – name right So let’s give it a name my angular application or let’s give a name My Demo up Patient Okay and demo app one is the name of that image So when you hit enter first, the image would come up right damage would be spun and the container will come up Let’s just wait

for the container to become active So let me first open a new tab of this terminal Okay, and here let me run the command Docker PS and you can see that few 42 seconds ago This app was created right the demo app one here It says the web pack is compiled successfully So if Go to my Firefox the service would be active The angular application would be active Okay, but if I want to temporarily stop this container or if I want to kill this then I can use those commands Docker stop or I can use Docker kill Okay, so let’s use those commands and see how they work I’m going to say danke stop followed by the container riding Correct hit enter So the doctors are stopped Now If I do a Docker PS command, this container would not be active Okay and over here also, you can see that which was temporarily compiled It has ended right here in the service is not hosted anymore So that’s how the docker stop command works So let me go to this command and restart the same service And over here this time instead of using the docker Stop command Let me say Docker kill Okay Sorry I’ve just used the same container ID Right? So I need to do a Docker PS first Okay And yeah now this is the container ID, which I have to kill so I’m going to say dr Kiehl pasting this culinary and a tender and that’s container has also ended so you’re in the service has exited from here, right? So that’s how you kill a container That’s different between the stop command and the kill command Okay, so I’m going to clear the screen and after these two commands that are two commands like Docker RM and Docker RMI, right? They are used to remove containers and Respectively, so let me go ahead and do that first Let’s run the command Docker RM Okay, and now we have to specify which container you want to kill or remove So for that purpose Let me first find out which are the different Docker containers There are there in my system So when I do a Docker PS – A there are a number of containers and from here Let me remove this test angular container Okay This is the name of the image and this is the container ID So I’m going to copy this container ID and go back here Let me clear it and here let me run the docker or em with the container writing and when this is return it means at my container has been deleted successfully and the benefit with this is I have freed up a little more space in my host right in my doctor region now guys are similarly we saw how to remove a container Okay now, let me go here Let me do a Docker images So this is the other list of the different images that are there in my repository And if I want to remove any of these images, then I can do Docker RMI and what we have here is we have a resume John we have an Alpine image, which I do not need So let me copy this redis image and remove this image from my repository So the command is Docker RMI this time because remove image is what it stands for and I can specify the image name or I can even specify the image ID So So image name is good enough So that’s what’s happening, right? It says untagged and deleted perfect now I can clear the screen and what I wanted to show you I’ve showed you already know if I run the docker images card again, then redis would not be visible here so you can see Alpine, but you can’t see red is correct So that’s how it works So, let me go back to my slides and go to the next command We spoke about stop We spoke about kale We spoke about Docker RM, and we also spoke about Docker or am I now Next command that is in question is the docker exec Command Okay This command is used to access any Act of container Right? Any container that is actively running If you want to access the bash of that particular container, then you can use this exact command Okay, and we use a it flag over here So you can either use – ID together or you can use hyphen I space hyphen T Now What I does is it’s basically it says access your Boehner in interactive mode, so that’s the option this flag specifies and that’s why we’re able to access the container Okay, and you have to specify which container you want to access followed by the word bash So let me go back to my terminal and show you how that works So over here, let me clear the screen and do a Docker PS and check which Cardenas are actively running None of them are running right now So let me start a container over here Okay Let me do a dog Are in fact I can start one of the containers I started sometime back the demo app one, right? The one I spoke about is the angular application Let me start this same container Let’s wait for it to come up perfect

Now it says webpack compiled successfully So now let me go to my browser and hit localhost photo double zero because my angular application is active on port number for to double 0, right So this is that angular application, which I was talking about So So if I go back to my terminal you can also see that I have specified photo double zero as the port which is to be used to access that application on my host And this is the port number it’s running on internally in my container So I’m mapping my container port to my host port and because of this I could access that angular application on my web browser now getting back to our slides We are supposed to use the docker exec command to access this container, right? So right now I cannot access this curtain over here Let me access this curtain of in a new terminal So this is the new terminal and here if I do the same Docker PS command, the new container is active So from here, let me copy the container ID and then run the command Docker exec with the flag It followed by the container ID and then bash bingo So right now I am inside this container So all this time I would this was the user right Erica at the rate Ubuntu This was my host machine and this is my username right now Now I’m logged in as a root user inside the container with the hammer having the I’d eat this one because this is what I specified over here So now we are not in my local system We are inside the container and what can we find inside the container? We would basically find dependencies libraries and the actual application code of this particular angular application, which is both sit over here Right which you can see all the project codes would be present inside this container, correct So let’s verify if that is the case By checking if you are actually there and by doing an LS, you can see all the different files here We have a Docker file, which was used to build this application And then we have a package dot Json file, which is the most important file to build any Android application or any means that application and then we have protractor dot corner of dot J’s, which is used to test any other applications and then we have so many others right? We have an SRC folder We have 1 e 2 e folder and then you have noticed Code module So this is where all your project dependencies are stored Correct? So package.json specifies What are the project dependencies that you want? And this is where it’s all stored So this is my Android application Right? So if I go One Directory back, I am in this SRC folder now Okay Let me do an LS I have a pure let me go One path back again and do an LS and your you can see that I have other photos like bin games include lip local has been shared and SRC now These are inside my container I hope this was enough evidence for you I hope it was so I’m back here And yeah, that’s how you access your container If you want to make changes you can make changes yard Okay, and since we are inside the container, let’s just create a new file So let’s just say touch F1 So the touch command is used to create an empty file, right? So now if I do cat F1, of course, there is nothing but let me do a sudo G edit Okay, so I don’t need to give a pseudo Because I’m already logged in as root user So I’m just going to do g8f one Okay, so it’s not letting me access this Command, right? Okay guys Anyways, that’s how you access the container Okay So let me just clear the screen and if you want to exit the container exit The Bash then you should use the command exit So when you hit exit your back as the adric our user on your Ubuntu host system interesting, right? So I’m going to clear the screen and go back to my slides and check what’s next and then we have the docker commit command And what this Docker commit commanded does is that it basically creates a new image of an edited container on the local repository It’s simple words It creates a new image of any container which you have edited, correct So let’s execute this doctor commit command and see how that works Let me go to my terminal here Let’s first run the docker PS command check This is the container ID I access my Docker container So I hope something is would have been there So A new image of that particular Docker container Okay, so I’m going to say copy and run the command Docker Comet and then specify the container ID of your container and followed by that you have to specify the name of your new image so I can say what an NS / my image, right my angular image So this would basically create an image of this Container which is running and big or perfect it’s done So if I run the command Docker images, then there will be a new image with this name and tag Let’s verify that by going to Docker images

Let’s go up and as you can see there is version Alice / my angular image Perfect This is what we want to verify correct So let me clear the screen and go back here And yes the work package compiled successfully This was the message We got earlier So anyways Let’s not worry about that That’s what a Docker command does So if I want to stop this cutting a service then from the new terminal, let me just kill that container service for X So this is the ID would have copy this and then I’m Gonna Save Docker container stop and my container would have stopped So here Yes, my service has stopped over here Bingo So I’m going to clear the screen and both the places Okay now, let me get back to my slides So So the next command that we’re going to talk about is the docker export command, correct? So the docker export command is basically used to export any Docker image in your system into a tar file, correct? So this tar file is going to be saved in your local file system and it’s not going to be inside Docker anymore This is another way of sharing your Docker images, right? So one way was by uploading it to Docker Hub But in case you don’t want to do that, you don’t want to upload it to Docker Hub because the image is very heavy so that This is an alternative which is used in the industry where we do a Docker export from one machine and we save that image as a tar file and this start file is imported inside the destination system and over there It can be accessed again and the container can be run So let me show you an example of that by first of all getting to it Okay, so it says Docker export, right? So this is the syntax for that Okay, you say Docker export you use the output flag with two hyphens you can Specify the name of the tar file that you want to store it with and then you have to specify your image name over here Okay So the image name over here is my container so you’ll have to specify you are amazed name So let me go to my virtual machine and what are the docker images that I have available? There is what Dennis / my anger image There is my custom Ubuntu So what I’ll do is let me save this my custom Ubuntu image Okay This is my image and the image ID is Straight to I want to copy this go back to this terminal and what I’ll do here is I’ll say Docker export double – which is the flag I’m going to say output flag is equal to F to specify the name of my tarfaya, right? So my Docker tar file, I can say I can say that my Docker tar file and Hereafter specify the container name So Docker images wouldn’t do for that So I’m to do a Docker PS – A so I have a custom image You’re right So let me save this particular image So I’m going to copy the content already copy this and paste it over here which indicates that I will create a top five of this particular container and this stuff I’ll would be saved in this repository itself in America advisable to now since it’s a heavy container It’s going to take a few seconds and it’s done and we can verify that by doing And LS the name we gave us my Docker tar file, correct? And then you can see there’s a my docket our file which is basically a tg5 So if you go back to your documents, you can see that there’s a new tire file my Docker tar file that is created and you can modify the same my docket our file over here This is the newly created tar file so I can go back to my slides here and let me just clear the screen Okay, perfect So going back to my slides I’ll show you how the docker export command works And what’s the benefit now in the next slide we have the docker import command The docker import command is basically used to import any tar file If you have any tar file, which has been given to you by your fellow developer and if you want to create a container out of that one, then you have to import it, right So how is that possible? So this is the syntax for that The command is Docker import and then the complete path of that demo file of that tar file, okay So for this particular purpose, I have already created one tar file because I wanted to create one which can be imported very soon So I created a tar file over here demo taught so it is present inside my downloads folder, correct So let me import that file So I’m going to say darker import and then I’m after specify the complete path So it’s slash home slash a dareka /downloads / demo Tower, let’s hit enter and this particular image has been successfully imported You can verify that by seeing the first few characters of the newly created image

Okay So let’s run the command Docker images over here and you can see that just recently 23 seconds ago New Image was created right with the same image re to 3ef and does the same image audio over here, right? It starts with the same sequence characters and right now it has Your name so that is how you easily import Docker images? Okay, the first exported and then you can import it So let me just clear the screens of both the tabs and now getting back to my slides mom download my doctor import command and now comes the advanced Docker commands Okay So after here we saw the docker commands which are very basic and you know, which can be executed easily But here comes the challenging part Docker compose and Docker swamp, right? These are all Advanced concepts and DACA which solves a lot of business problems And of course the commands are also little Advanced nature So first, let’s start with Docker compose, you know, there are two variations to it and the to syntax can be seen over here doctor – compose built and Docker – compose up So these are the two commands which work very similar to Docker build and Docker run, right? So Docker build is basically used to build a new image from a Docker file Correct? Similarly Docker compose build is used to build your Docker compose by using your Docker yawm Al file Now your Yama file stands for yet another markup language And now in the yongle file, we can specify which all containers we want to be active Okay, and you have to specify the path of the different doctor files, which will be used to create those containers or those services and that’s what Docker compose does, right? It creates multiple services And it’s basically used to manage all those services and the start them at one go so it would use more than one dockerfile Probably If you go through my previous video on Docker compose have explained it in detail over there I have used three different Docker files and using those three doctor files I have created three services, right and the three different services are the angular service the express and load service and the mongodb service The mongodb was used as a database the express and load was used as My back-end server and angular was used for my front table Okay Now the link to this video is present in the description below Okay, but let me just quickly wrap this up by saying that if you want to build that you use a Docker compose built and if you want to start your Docker compose and start the container service, then you can use the docker compose up This is very similar to the docker run command Okay, and that’s what your Docker compose does, right? It creates multiple doctors services and computer Rises each of them and gets the different containers Has to work together so perfect Let me go back to my terminal and let me do that for you So Docker PS, there is nothing So right now we are in the home / it reca folder, correct So let me do LS and there is a folder called means that cap So I’m going to Siri into this particular folder and here if I do an LS, you can see that there’s a Docker compose document file So let me do a g edit docker Campos dot yml file So here you can see that I have specified the commands to create three different Services one is the angular service others the express service and finally my database service Okay I’ve explained all these things in my previous video I repeat the link for that video would be in the description below Okay So let me quickly execute this Yaman file Okay, so if I do a docker Campos build then this command would look for this Docker compose file inside this directory Okay, and then it would you know, once this image is built I can sit we execute that command by using the docker compose up Okay, so I’m just going to replace build with up this way My Docker compose would also be up and running earlier I showed you an Android application and this time is going to be a entire Means like application which is going to involve everything mongodb Express angular and node.js so my expense is up and running My angular is up and running My mongodb is active on port number two seven zero one seven My expense would be active on port number 3000 and angular as usual would be active on port number for to double zero So let’s verify the Same by going over here Okay It also says we’re back up I successfully so this time if I refresh this there’s a different application that would Come up, correct So this is my main stack application or important photo double zero is the front end on port number 3000 This is my server end which simply says full bar and then and port number two seven zero

Sorry zero one seven There is my mongodb, right? So these are the three different Services which are active on my waist port numbers So going back to my terminal I can do a Docker PS to verify that there are three different Services of mine which are running If I want to stop each of these Services, I can simply do a Ctrl C from here and hopefully it stops Yes All three services has stopped Let me execute the same command and this time yeah, they’re all gone Right so the docker PS command shows no containers active bingo So I’m going to clear the screen out Okay and go back to my slides and go to the next command and the next Advanced command that we have is the docker swamp command Docker compose I told you was to basically have a multi container application Right and Doc a swarm is however used to manage multiple Docker engines on various hosts, right? So usually you might be aware that your Docker engine is hosted on one particular host and you’re executing your Docker commands over there, right? That’s what we were doing all this time Even dr Campos did that on the same host three different Services were started but with Docker swamp, the benefit is that we can start those services in Multiple machines so you will have a Master machine which is nothing but the doctor manager as visible from here and then you will have different slaves or the charcoal as worker in Docker terms So you have a manager and work up and whatever service you start at The manager will be executed across all the machines which are there in that Docker swamp cluster Okay So it says right it creates a network of Docker engines or hosts to execute the containers in parallel and the biggest benefit of Dr. Swarm is scaling up and ensuring High availability Okay, so some of the commands which are associated with Docker swarm are these if you want to first of all start off creating a Docker storm, then you use this command Docker swarm in it And you say advertise Okay, and then you have 192 168 dot one dot hundred It’s supposed to be two hyphens over here Okay Yeah So this is how the syntax is supposed to be doctors swamp in it – – Advertise – add up and then you have to specify the IP address of your manager machine So if I start the swamp from this particular host of mine, then this would assume the role of my manager Okay, and in this syntax remember after specify my own IP address so that the other workers who will be joining my network would subscribe to my IP address over here So let’s quickly go and execute this First Command Let me show that to you Okay, so Let me open up the terminal and the command is darker swamp in it which sells for initialized with the flags advertised adder and then the IP address so the IP address of my VMS hundred Okay, so when I hit enter see what happens it says swarm is initialized and this is the current mode This particular node is now a manager Okay? And if you want other machines to join this particular manager as workers, then the after use this token, so we offer just copy this go to the other machines and execute it supposing this is another machine of mine Okay I’m giving you an example so over here you would have to taste that token Okay So this is called the token you just hit enter and then you will join us a worker Okay? So that’s how the docker swamp command verse now I cannot go into too much details with respect to how Docker swamp works Okay, because there again it will take a lot of time and if you want to actually learn Doc a swamp you can go and watch the other video which I delivered a couple of months back right that video is called Docker swab for high availability Okay, and that is a detailed video and you will enjoy that video because with that video I have shown how dr Swann can be used and you will see the power of dock In that particular video, so I would request you to go there and the link for it is again Below in the description Okay, so I would request you to go there if you want to learn more about Docker swamp, but getting back to our slides we have other commands You’re right So the docker swarm join is what I already explained to you So followed by this you will have a token So if you give that you can join a particular swamp cluster as a worker Okay, so if you want to regenerate that particular token, which is needed to join that particular cluster then add the managers and you can Execute this command Docker swamp join token, so it would generate that open and give it to you and similarly If you want to leave the docker swamp cluster, then you can execute this command Docker swamp leave Okay So if you execute this command straight away at the workers end or the nodes,

then it would simply leave okay, but at the managers and it would not leave just like that you’d have to append the flag Force So let me show you that Let me just execute the command Docker swarm leave It was a vodka it would leave right away But since it’s a manager, like I said, it says use the force option So let’s use that okay doc a swarm leave with double flat force and it says the node has left the swamp perfect Right? So this is all about Docker swamp guys Okay, so let me go back to my slides and cover the one last command that is that for today and that command is the docker service command So this command is used to control Any existing Docker service beat any container or Bagheera Docker compose or Docker swamp or anything else? Right So talker service is a very underutilized command I would say because if you want to control your different nodes when you’re in a Docker swamp, then you use the docker service you use a Docker service command to list down The different nodes are there in your cluster you use a Docker service PS command to find out what containers are being executed in a particular node, and then You want to scale the number of containers supposing you have a cluster of five machines and then you have five containers running in each of those machines If you want to scale those containers to 25, that means you will be executing five containers on each machine, right? So for that you have to use a command Docker service scale if you want to stop any container on any particular node, then you use a command Docker service stop And then if you want to find out the different logs, then you use command Docker servers logs Docker servers are on and so on Right So the docker service command is let me repeat it’s used in sync with your Dockers warm and Docker compose primarily So that’s why these form the advanced Docker commands So let me go to my terminal and quickly show you a glimpse of this So it’s Docker service If we do an LS, you will not have any options listed because it says this is not a swamp manager currently, but if I start my Docker swamp and then if I run the same command Docker serve as l Then you can see that the output is different right? I have a few attributes your ID name mode, which is basically details about the different worker nodes in my cluster But since no worker has Norma cluster, there are no entry job So that’s how it is So, let me just add that So that is the docker serve as LS If you want to find out the logs, then you can do that too Docker service logs So if you use the doctor service log, you have to specify which service you want to check the logs off And what is the task? Right so which tasks and which service so it’s that simple guys, so that’s how da cursor which is used Okay guys And again if you want to stop any service if you want to remove any service you can use these commands doctor service stopped or doctor service remove What is Docker compose So the definition says Docker compose is used to run multi container applications Multi containers, right? So well, the thing is you use one container usually to host one service right now That’s what we discuss all this time Now, let’s take a case of a massive big application All right on it has multiple services And in fact, there are multiple web servers which need to be placed separately on a particular server or on a particular VM because it might cause an overhead because maybe 2/3 so was cannot be hosted on the same same machine So at that time what we usually do is we we create we have a new VM and we hosted their right or we have a new server all together For example, if you want to have if you want to monitor your your application, then you might probably use niosh So nagios you may have there’ll be times that you’ll have to hose it separately in a different machine and similarly you will have made very other various various So I was like Jenkins and many web services so that time, you know instead of having a different different machine or having a different VM We can simply have a different container Okay, you can have these multiple Services hosted in these multiple containers So each container will be hosting one service and then these containers would be home run such that they can interact with one another Okay exactly how it works in the you know in case of servers or VM so it’s exactly the same way but it’s just that it’s going to be one command very simple command, which is gone Oh, you know get your doctor composer and this Docker compose up It’s like a grid right so it will run All the three containers at the same time it will host all these and it will get them to interact with one another So that’s what that’s the benefit with the docker compose And that’s the whole point of today’s session Right? I want to show you how awesome Docker compose has this way So Yeah moving on to what I’m actually going to show

you in today’s session I’m going to show you how to set up a mean stack application like I mentioned earlier So first of all, the mean in means that has four different things So the m stands for mongodb, which is the database and E stands for Express a chance for angular and n stands for node.js now together They are this is a full stack application Okay now since we are using a combination of Chortles we a comet to a means like application Okay, that’s what it’s acronym to so this full sack application is again a web service so such that, you know, you have a front end client and you have a back-end server and then you have a database So whenever you have your clients or your customers interacting with your web server it would they would be interacting with the client Okay, the client of your thing front end client so the data that they pass over there, right? Whatever As they perform or whatever requests they make that would go to the client Sorry that would go to the server and the server would you know do the necessary function? So it would have to sometimes need to fetch the data from the database So in that case it would fetch the data and provide a response or sometimes it might have to do with these are the functions So the actual functionality would be done by the server and the displaying part would be done by the client and the actual data would be stored inside the database So that’s how The foods like application works its combination of for these three services the front end client a back-end server and a database and that’s what I’m going to use Right So if I want to have these three services, then I would have to create three different containers Right? So I have a container number one, which I can use for mongodb which would be my database have continued number two, which I can use for my back-end server I’m going to use express and node.js in combination and the third service that I’m going to use is my front end Client, okay So I’m going to use angular for that purpose now, I’ll be hosting these three services inside these three containers and each of these three containers would become would be built from their respective doc of files Okay, as you can see there’s dockerfile one dockerfile to and dockerfile three now in the same way that I explained in the previous slide We have a Docker file should build the image first and then that would be spun into a container the same process follows here also Okay It’s just that for each of these containers separately We would be built if we would be using a Docker file and each of these doctor This would be called, you know one after the other with the help of our Docker compose file So Campos is what is the key term that you need to note here? And the compose file is it’s a yamen file basically, okay yet another markup language and in the common file you for you specify the location by a Docker file is present and then you also specify the port numbers that container needs to use to interact with the other container Okay, and at times if you have a database in place, you might also have to specify by the link of the database server and the database will be connected So for that purpose you do that So that’s how the docker compose works And that’s the overview that I’ve given you right three containers, you know built from 3 doctor files, which would be called by the docker compose file, which is a yeoman file and there you go You will have a web application hosted that’s up and running All right, I mean is nothing but a full stack application that that involves The combination of these four Technologies angular node.js and express and mongodb Okay So the three services that might mean sack application involves are primarily they are the front end client the back-end web server and the database So this is the same thing that I explained a couple of minutes earlier But since you have a pictorial representation, I hope this can you can relate to this better, right? And my friend and client is going to be my angler and the backend server would be no Jason Express and database is going To be mongodb Okay, so you guys should have any problems now and these three services would be hosted separately in the three different containers Okay, and that would be built from my Docker compose file So that’s what I’m going to do now Now, let’s see how to do containerize and deploy a mean app by using Docker compose great, so First of all, let me open my Virtual Machine So first of all, I have my terminal here and now I want to show you my project Okay? So this is my main stack app is the folder where I have my project present So as you can see there is one angular app folder, which is basically containing all the codes of my for my for my client for the front end This is the back end server where all my codes are press it again And this is the composed file which I have written and this Docker compose file is what is going to do all the work for us Okay

It is really Work and one thing you might notice here is that I don’t have a Docker file for my mongodb Right? So I mentioned earlier that I would be using a doctor or file for creating the dirt container But in this case, I don’t really need to do that Okay So a Docker file is a little complicated procedure, but for my database, I don’t need to build something from scratch and I don’t need something customized so I can just simply use an existing mongodb image, which is there on the docker Hub I can use that and Link that with my back-end server So that’s why I don’t have that but instead I have directly called that mongodb image over here Okay So this is the yongle file and if you guys are watching this video at later point of time, you can also relate and you can understand what I have specified here because I have mentioned the in comments I mentioned what each and every line does Okay, so it’d be helpful for you people do come back and have a look at this later if you are having any problem, but in the meanwhile, let me explain each line here So in the first line we are saying the In to be used is 3.0 Okay, so you have to install a version of Docker compose separately and Doctrine will anyways be there, right and you have to download a version of Docker compose which matches your Docker engine version Okay, because certain versions of compose is not compatible with certain versions of engine So you have to just look up the right version and I am using version 3.0 of compose and I have version 1.1 six of my doctor engine Okay, so just make no doubt make note of that And yeah, you are specify the version that’s gonna be our first night and after that you simply specify the different services that you want to run Okay you the command the key word for that is services and you give a collinear and you specify the three different container names? Okay And each of these containers will contain the actual services So in case of my angler just going to be the name of my container number 1 right and here I’m saying build this container from the documents that’s present in this particular folder This particular path Okay, similarly expresses the name of the second container and I’m asking it to build this container from the dockerfile that’s present in this particular path Express So in case of my mongodb image creating the container with the name of database and I’m not giving a Docker file here I’m just saying pull the image from the docker Hub Okay, so it would use a image that is the Mongo image with the latest tag and it would Use that okay So let me just quickly go to my photo and show you where the rock of eyes are present So this is the angular app now since my compost pile is here from my compost file This is the pathway my Docker file will be present Right? So this is that Docker file So let me just open this dog for and keep it here and similarly if you can if I put this go back there’s Express server folder, right? So this is the code where my coach for server-side is present and my Docker file for that is present over here So Now coming back to my yamen file after specifying the path of each of these darker files specifying the port numbers on which they should be running inside my you know, where the port mapping how the port mapping happens So whatever application hosting inside the docker container, right that will be hosted in one particular port number of your darker So you have to map it to one of your port numbers of your Local Host machine If you want to see the you–if you want to interact with the web browser then you have But map it with a particular port number Okay So I have a said this is going to be the local machine port number on which it would be visible And this is the port number on Docker where the application is going to be running Okay Similarly for express Its 3000: 3004 mongodb It’s to 7 0 1 7: two seven zero one seven So each of these port numbers are default for these applications Okay, so I haven’t done much of a deal over here Let me just since I’ve explained the Camel file in a decent fashion Okay, there’s one more thing left There is links Okay Now this line if you see I’m linking my server side to my database Okay now since I have a database where it meets the fetch data from on a regular basis, we have to give the keyword links with a colon and the specify the container name So that’s why my third container is going to be the mongodb container It’s going to have the container name of database and I’m linking that over here All right, so it’s pretty simple And now that I’ve explained each of these Campos files it’s time I explain the doctor files so This is the first Docker file, which I created for my front end and it’s very similar to the dockerfile that I use for my previous session If you people remember if any of you are aware there in that session, you might realize that first of all, I’m using a from command to pull the load image Okay with the version 6 I’m doing this from the broker up and inside this image

I’m creating a new directory Okay make directory is the Linux command that you use I’m doing that with the pflag I’m creating this pot Okay, so I’m using the pflag so that creating the entire path the parent path also / user / SRC Okay, so I’m creating this folder inside my Docker image and I’m changing the working directory to the newly created folder or new newly created path Okay project path And what we need to do is we have to copy all your dependencies have to copy all your past or your project codes and all these things right? So that’s what I mentioned to you when I was delivering the slides all your Project codes all your applications codes the dependencies libraries will all be packaged together So that’s what we are doing here first thing copy the package or Json file to the project path Okay Now if you can let me just show you the package or using file So this is the package or Json file First of all, I’m copying this one inside my Docker container Docker image now, that’s because this file is the most important file which has details about which dip version of dependencies are needed for your code For my angular code which is present over here, but he followed my angular code represented in s RC / app path So whatever I would need the versions of that dependencies would be have to would have to be mentioned in the package.json file Okay So I’m copying this file inside my current Image First and Afric copy it I’m running a npm cash clean command Okay, so MDM search for node package manager It demands your application here and caching is understand You’re just removing the cashier It’s not a very important command but the important commanders npm install So when you give the npm install command what this does is it would first of all look for the package dot Json file Okay, the npm which is node package manager would look for the package.json file and whatever versions of dependencies are mentioned inside it Those would be downloaded Okay, and they will be present inside a new folder called nodes underscore modules okay, so that would be created and it would have to be moved to this particular path inside your it should be moved inside your documents Right so that command is what I’m doing next So after downloading the node underscore modules all the actual dependencies that along with the actual project codes So those also I’m copying by giving the.com and you’re okay So when I say dot whatever is present in the host machine everything in that particular path would be copied to my Docker container path of this and then I’m simply doing an Exposé photo double zero Indicating the fact that I want this container to have an open port at this photo double zero Okay, and the same folder of 0 is what I’m using over here since full double zero is where angular is hosted a mapping that to my host machine sport of photo double zero Okay this I do in the yamen file But anyways, when I specify the port number, but it’s running I can simply do a npm start command Okay, and when you run an npm start It’s your son your node package manager, but would straightaway look for your codes So your codes would be present inside the SRC folder Okay, you have another folder called so it would look for everything here and whatever is present here It would start executing them And yeah, that’s a of course the dependencies would be present inside the same image So your application will be successfully hosted in that way Okay and similarly going to the third doctor or second dockerfile This is Creating the this oversight Okay, and if you can notice there’s not much of a difference So the almost every step is the same except for me exposing the port number here So I’m saying my server would be hosted at Port number 3000 of my Docker container Okay, and this again, I’m mapping in the human file to the host machine port number 3000 Okay So that’s the only difference This is the only difference in both the doctor files And now that I have also mentioned where these files are present inside My almond file I can simply execute this Docker compose file to have my service to my having to have my servers hosted So the command for that is let me check Where am I right now? Okay home / a trigger I’m going to see Dee do the folder and here we have the same set of files and folders, right? So this is the file that we want to execute and the command to execute the docker compose file is Doc Oh – compose space up Okay There’s a very simple command and you dockerfile would basically be executed as you can see It’s starting the angler one container database one container and the server side container great So guys, this is going to take a minute Okay, the angel abs

are the development server is listening on localhost for 2.0 Great This is this indication of my client side Okay, so it says webpack compiled successfully That’s great My web services are hosted Now What I can do is I can open my web browser here and go to those particular port numbers and see if my services up and running So if you remember my client is hosted at Port number for to double 0, right So let’s hit enter I can either give localhost or I can give Either of that will do and as you can see my angular client is up and ready and my app is simply about having a forum page Okay, so I can add details You’re my first name last name phone number he deals and Just click on add to get the details and that details would go to my database so that it’s a very simple application which we have created And similarly you can verify if the client if the server is running by going to the port number where it was hosted and you can recall this is the port number was hosted on Fubar great So this was the authentication that I needed and localhost two seven zero one seven is when mongodb is hosted So for mongodb container, we get a message like this It looks like you are trying to access mongodb over HTTP on the native driver port and if you get this message, it means your continues operatic very good Alright so we can just Let’s start web application by giving the name Behavior Okay So the first name, let me say I’m going to have my own name I’m going to save our them All right last name I’ll go Venice phone number I can just give a random number here Okay, and if I say add this data would go into my database That’s my mongodb container All right, great So it shows that already I have these rails present Okay, so I have this one record and now this record has been added Okay Now let’s verify that by making an API call Now I have only explain the client aspect The service had aspect is something that didn’t explain right you guys might you guys should know by now that the client will take the request from the sorry the server would take the request from the client and query on that Right? If it if there’s a you know, if there is if there is a request to access the database then it would fetch it from the database and respond to the client So let’s do that This of course is the UI that I created which shows my database but anyways to verify if the same thing has gone into my database Actually we can do that by going to the server here and Going to this particular URL, okay, there’s a / EPA / contacts, right? So this is basically an API call that my server is making and at this URL at / AP / contacts It can view what data is present inside my container So it’s it says that the first record that is present is this one it has an idea of this which was generated automatically And of course the first name last name and the phone number was what was given okay, and this was the this was the record that I created And as you can see when this is present, so if you want a little if you want to play around a little bit you can do that and let me just do that by deleting one of these records Okay I’m going to delete the first record And now if I just go back and refresh this page, you can see that the first record is gone Okay, so we have this version We have NS and the phone number now, that’s because we deleted that from the database itself and I made a call from my server from a client Sorry, so I hit a delete button Button from my client that Quest went to my server first and the server would indirectly go to the database and delete that particular record And since I did a / AP / contacts as I refresh this this would return whatever is present inside the database so it’s that’s what is visible here Right? So currently this is the only record that is present in my container in my data mongodb database, right? So that’s what’s visible here and similarly this To functionalities I showed you there are a couple of more functionalities and you know that we can do with this image You can retrieve one particular record If you want to you can do all these things Okay, and this is just my application You can come up with your own customizations You can build your application in your own way, correct? And you can do all these and of course I cannot go into depth I can teach you in detail what the words different parts of this application is but instead I can point you to one of The videos which is, you know, a red record video which has a complete tutorial on how to create a mean stack application

Okay So let me just give you the link of that video in some time But before that I just want to quickly show you that this was the express server page And again, we had the package or Json file here the Apple IDs, which is basically the entry point into my server and in this app dot JS file, we would have details about what apis are there what functions Function calls can be made and whenever that particular function call is made by the client Then it would be routed to this route dot J’s file inside the routes folder Okay So the definition of those functionalities would be present here So whatever actions need to be performed when clicked on that there will be specified here So that’s how the server communicates with the database and forth Right? So that’s how it works And yeah, that’s the explanation of both the mean stack At the company explanation write the angular app and the express server What is Docker swamp? So a Docker swamp is a technique to create and maintain a cluster of Docker engines Okay Now what I mean when I say a cluster of Docker engines is that they will be many Docker engines connected to each other forming a network Okay Now this network of Docker engines is what is called as a Docker swarm cluster And as you can see from the image over here, this is the architecture of Docker swarm cluster Okay, and there will always be one doctor manager In fact, it is the docket manager which basically initializes the whole swarm and with the manager they will have many other nodes on which the service would be executing So there will be times when the service will also be executing at the manager sent but basically the managers primary role is to make sure that the services or the applications are running Earning perfectly on the docker nodes Okay Now whatever applications or services that are specified or requested they will be divided and they would be executed on the different Docker nodes Now this app is called as load balancing, right the load is balance between all the other nodes So that’s what happens with the Dockers warm And that’s the role of a doctor managers Now, let’s go and see what are the features of Dockers warm and why it’s really important and whites You know the go to standard in the industry That’s because with Docker swamp, there is high availability of these Services Okay It’s so much so that they can be hundred percent High availability all the time, right? That’s what high availability means, right So how is that possible that’s possible? Because at any point of time even if one node goes down then the services which are running inside that note They can start the manager will make sure that that service is just that Services started on other nodes, right? So the service is not hampered even though the note maybe down the load is balanced between the other nodes which are active in the swamp So that that’s what a Docker manager does and that’s why the doctor manager is heart of the Curse one cluster Okay, that’s one feature The other feature is auto load balancing Now again, the auto load balancing is something that is related to high availability itself We’re at any point of time If there is any downtime at those times, the manager will make sure that those services are not stopped and they are continued and executed on other nodes, right so that the manager would do but along with that load balancing also comes into the picture when you’re when you want to scale up your service Has supposing you have say three applications and you have bought three notes for that Right? So including the manager you will have 4 nodes because manager is also technically a node Okay, so you have a manager node, and then you have three different nodes So in this case the three services which you deploy they will be running on three different nodes And if you want to scale them at a later point of time, let’s say you want to scale them up to 10 Services Then at that time you the concept of Auto load balancing would still come into the picture We’re in the attend services They would be divided between the nodes All right, so it would be such that you will have three probably three services running on one node 3 more services running on the other node, and the remaining three services on the other node And the one service that is left out that would you know, sometimes be run on the manager or it would be load balanced on some other node Okay, and the best part of Dockers you don’t need to do any load balancing It’s all done or on its own right? So there’s an internal DNS server with which the deed The doctor manager manages and the DNS server, make sure that it allocates It makes the DNS server make sure that all the nodes are connected in the cluster and whenever any your load is coming it would balance the traffic between the different nodes Okay So that’s one big Advantage with auto load balancing and another feature is that of decentralized axis?

So when we say decentralized access it means that we can access these managers or these notes from anywhere So if you have these These managers or order or these nodes hosted on any server Then you can simply SSH into that particular server and you can get access to that particular manager or node So if you access the manager, then you can control what services are being deployed to which nodes Okay, but if you log in or if you sh into the server which is a node then you can control or see which service is running inside that node itself Okay, but however, you can’t control the other nodes if you are inside a node only the The manager node can do that for you? But anyways, all that we need is to log into or SSH into a doctor manager and you know control which services are running right? So that’s all we need that can happen this way and of course it’s very easy to scale up deployment So I also spoke about that earlier where you know, you can if you want let’s say you already have but answers and if you want to certainly scale it up to 50 or say a hundred servers hundred Services, then what you can do is you can just buy a few more sir Us and deploy those hundred Services into those servers, right? So it’s a very simple or very simple functionality where you can do it with just one single command one single command is all it takes to scale up your number of services or applications to the desired amount Right and you will have multiple Services running inside that same Docker node So each node can have a probable probably have 10 or 15 service is running and it basically depends on the number of nodes Are you have but Ideally, you wouldn’t you shouldn’t do that You cannot have but too many services running inside the same note because that causes performance issues Right? So all those things you can do and finally is this concept of rolling updates and rolling update is by far the most catchy feature because when we said rolling updates we what we mean is these applications are Services which are running right? They will have to be updated at one point of time or the other down the line you will have to update it So at that time what will You cannot you know upload update manly in every single machine, right? If you don’t have darker if you have hosted your web servers on either virtual machines or on actual web servers, then what happens at that time, you would have to go to each and every system and then probably updated everywhere right or you might have to use other configuration management tools But with the help of Docker, you don’t have all those problems You can simply, you know specify the the you can use the rolling updates functionality for that And you can specify a delay So in the delay, it would update one service or each service which is hosted or deployed inside every node It will update each of those Services one after the other with a delay of the specified amount of time Right so between so even when one surface is getting updated the other service is not down and because of that there is high availability since the other service is still up and running you don’t there is no downtime caused, right so you can be sure of that In spite of and rolling updates are very simple also, so you just again it just one command and you’re all done That’s these are the benefits of for Dockers Home and these are reasons why you should Implement Docker swamp in your organization If you have a massive web application web servers, which is deployed over multiple servers So that’s the big benefit with the Dockers warm, right? So moving on to the next slide Okay Now it’s time for the demo Okay Now, let’s see how to achieve High availability with Docker swamp But before I get started with the Hands-On part where I would be showing you on my virtual machines, I want to First go through what I want to show you with respect to high availability Okay, and how to achieve it with Docker swarm? Okay, so first of all so first of all men terms of high availability The ideal definition is that you have the application of the services deployed in each of the web servers? Okay Now look at this architecture where I have about two nodes and I have one manager Okay, and I have Docker engine running on each of these each of these nodes and each of these are all highly available Okay So at this point of time, I don’t have any problem okay with respect to any services and my application is deployed in each of these servers Okay, each of these servers or each of these nodes So at this point Time if I access if I try to access my browser, and if I try to access this port number in my browser, I can see my application running Okay Now this is the application which I will be showing you my demonstration on and this is also the application which I executed a couple of sessions back Okay, the the link of this application the demo of this I will share it at the end of the session

Okay, but don’t worry about that because this session is all about Docker swamp So getting back Back, what I was saying is since these are hosted in each of these servers I can access the application that I have deployed on each of these machines But look at this scenario where my service is only hosted on one particular node this time Okay I have the other services connected to my cluster Okay This is my swamp cluster where it’s all connected, but the application is not hosted on these two nodes So at this time, can you guess what happens? Can anybody does anybody think that the application will not be accessible on these machines? Can anybody tell me that if you people think like that, can you just Well, if you think like that, then you people are wrong because since it’s connected in a cluster these Docker whatever is hosted on one particular node, they can also be accessible on other nodes So even even in spite of the fact that these servers do not have the application running the web port on which this application is hosted, right? This port number will be internally exposed to all the nodes inside this cluster and since the port number on which it’s running over here that is for to double zero That is exposed to the cluster then in all the other nodes in the cluster on the same port number for to double zero The application with would be accessible right same thing with even this particular node So on for two double zero, you can access this angular application This is the second scenario of high availability But this is just a scenario where you don’t have your application This is when this is the third scenario where High availability is actually being implemented, okay? Okay Now you have a scenario where you have your three nodes and two of your nodes or one of your nodes goes down Okay So this time you don’t have your application itself forget about the fact that doctor is not the application not hosted forget about that fact Think about this scenario where your node is not accessible It’s down for some reason for some natural Calamity at that point of time Do you think you can’t access it? You can well that’s because the the again the nodes will be connected inside the docker class The swamp cluster and the port number would be exposed So because of this reason you would still be able to access you would still be able to view the angular application on these servers right now That’s the benefit of having a Docker swarm cluster All right So this is how the hive a high availability factor is achieved with the help of doctors form And this is what I’m going to show you in my hands on part But before I go to that part, let me just just quickly run through these Docker swamp commands Okay So these commands is what I will be using extensively in my demo and they’re also the most common swamp commands that you need to use when you’re starting with your Dockers warm cluster Okay So first of all to initialize the swamp you use this command you say Docker swarm and in it, you use double flag and say advertised Adder Okay followed the followed by that you specify the IP address of the manager machine or that same machine where you are Starting this service Okay So the when you when you do this, whatever IP address is specified here that particular machine would be acting as a manager Okay It is also ideally the same machine on which this command is running right the IP address of the of what you specify your it should be the same machine So that’s the thing and whenever you you should this command this swarm would be initiated along with the manager being this particular machine Gene which has this IP address Okay That’s what happens when you do a initializing the when you initialize the Swarm and of course when you initialize the Swarm you will get a token It’s more like a the key Enter key using which your other workers can join your Docker cluster Okay, but getting back to our Dockers warm, once you finish lies your swamp you can list the different services that are running inside that swamp Okay, you can list the different you can list the different Nodes that are running you can check which all nodes are connected to your swamp cluster You can check what all tasks of services are running You can check you can create a new service new service as in a new container and then you can also remove that a new container and you can scale them up using these commands Okay So use the docker service LS to list down the services that are running then if you want to drill down on one particular service and check in which node one particular service is running then you can the docker service PS command Okay, so it lists down that process when you shoot with the name of the service that you want to check for and then if you want to create a new service, then you use this command of Docker service

create then you specify the name of the servers in fact and you got to specify the image with you want to which you want to use to build that particular container and service? And finally to remove a service you use this Docker service rm4 by the name of that particular service And finally if you want to scale your services, then you can use this command Docker service scale and then you can just specify the name of the service and you can specify the number that you want to scale it up to Okay So in this case if I had the servers which are which was which had two replicas then by simply specifying is equal to 5 I can out of scale it up to five different I was right So those are these are the swamp commands which Which are applicable from the manager and and now going back to the node and if you want to list down all the nodes that are there in your swamp Then you can use the docker node less Okay, do note that here It was all about the different Services Okay, and these commands cannot be run on the docker nodes? Okay They can only be run on the docker managers Okay So here you have the docker node LS which lists lists down all the managers And the nodes and then if you do a Docker node PS followed by the service, which you want to in fact, if you do a Docker node PS it basically lists down all the containers or services that are running inside that machine Okay Now this command again, it can be run on even nodes Okay, this cannot be run on all the nodes So the node LS it can be only run on the manager And finally if you want to remove a particular node from your service from your cluster then you can run Run the command Docker node RM followed by the ID of that particular node Okay, but at times you might not be able to do that That’s because the node might still be connected to the cluster So in that case, what you have to do is you have to use a Docker swarm leave command When you use this command you can you can get if you run these commands from the nodes Then the nodes would leave the cluster and then You can just end your cluster, right and finally you if you can just run the Dockers mom leave from the manager and then you can end the whole cluster itself So even the manager would leave and manager would ideally be the last instance to live right? So when there are nodes there you cannot you cannot have the manager leave with the notes being present So that’s one thing and at times you would be given a error saying that you cannot leave the cluster because you’re a man What that I’m you can use the flag Force flag Okay So at this time you are as a manager you can leave the cluster and your cluster session ends there, right? So these are the top commands which are in question So yeah, I think it’s time for me to go to my session Okay, it’s time to go to my Hands-On session Where I’ll open up my virtual machines So for the demo purpose, I have got three different VMS Okay, and inside these vm’s I have three different Docker engines and I will be basically using two of the doctrines as my node And I would be using one of them as my manager Okay So this is my manager one as you can see over here and This is the password Okay So this is the manager one, which I’m going to start the service the whole swarm and the services from here Okay, and if I go here? This is my worker one as you can see over here All right And this is worker to now in these two nodes I would be executing my applications or Services Okay So first of all, if you want to create the swamp service, then you have to run the command Dhaka swamp in it advertise Adder followed by the IP address So the IP address of this manager machine is 192 dot 168 Sorry dot one sixty eight dot one dot hundred Okay, so great So my swarm is initialized and as it says if you want to add a workout with this warm, then you have to run this token Okay Now this is the token Let me copy this token And run this at the nodes and okay So I’m going to go to worker 1 I’m going to paste this token And when I hit enter it says this node has joined the swamp as a worker Now Let me verify that if I go back here and if I issue the command Docker node list,

then it says that I have one manager which is myself myself is being indicated by this aspect Okay referring to this own system, which is also the leader So it says manager status leader correct The state is And availability it’s active and recently I added the worker node So it says even this is available Now, let me go to the third VM and enter the token here and it says even this node has joined as a worker now if I go back to the manager and run the same node list command, you can see that the worker to has also come in now Okay now that’s because I have issued the join command at my node And so I’m going to clear this clear the screen and now we can start creating our services So first of all, if you want to create a service the command is docker service create followed by the name of the name flat Okay So you specify the name of the service that you want to give ammo? Let’s say I want to say angular application I will say this and followed by this we should specify the name of the image So the image name is demo app one Okay, and along with this I also want to specify the port number on which I want to do The Binding because the angular application which is being hosted in one particular Port number in turn my container that has been mapped to my browser port number right if I want to access it on my web browser that is this Firefox So for that reason, I will use the – pflag and I’m going to say photo double zero of the browser Port should be mapped to photo double zero of my contain Abode So this is the command Okay Now this command simply creates one instance of this service angular app, which will be built from this image demo app one Okay, and it would Bose the port number 4 Double Zero from the container to the port number for 2.0 of my browser So let me hit an enter And let’s see what happens We got to give it a few seconds because it’s a big application, right? Yeah So now let’s do a talker Docker service LS, okay You can see that one Android application is created Now This is just a warning Okay, you can ignore this because this is the confirmation that your service has been started Okay, you can ignore such warnings if you just what you need to look for Now If you get this image ID, then it means that your service has been created Okay This is the service ID basically so as you can see you’re right Now the mode is not replicated There is just one single instance and the same thing you can see Got it says replicas is one the same name which is specified the image that it used and the port number where it’s active right now Okay Now let me do a docket PS command from the manager and check if this application is running inside this node So yes, it says that this application is running over here now parallely Let me go to my worker one Okay, this is also connected to the same cluster So I’m going to do what Docker PS over here You can see that I have got no output So this means that there is no container that are started inside this node Okay This is the worker 1 similarly Let me go to work or two and say Docker PS again, there is no output when it come you know with this Okay It says no I started now if I go back to the manager and verify I can verify where in which node this application is started and the command for that is docker service PS followed by the name of the application that is and lower rap So when I hit enter you can see that the name of the application is this this is the ID and image that was there and the note but it’s running So it’s hosted in the manager one in my system itself It’s hosted Okay primary system The results say it is run running and the current seed is running about a minute ago Okay Now let me go to my browser and access Local Host for to double zero Now as you can see this particular, this is the Android application which I’ve hosted Okay Now I’ve explained what this application is about in one of my previous actions I would request you to go to that video and get more details about this application Okay I’m going to just quickly get back to my session here with respect to swarm So since I have started my application I can access over here Now as I explained earlier all the nodes in your cluster

can see the application that you’ve started Right I explained that order right now Let’s verify that by going to the other nodes So in spite of the container not being hosted on this particular node, I can get the same local I can get the same anger application over here because the port number would be exposed internally between the different nodes in that cluster Same thing with my Docker worker to right So if I do well, I’ve already done a Docker PS you can see there is no container here So let me just quickly go here and do a local host for double zero Yeah, so you can see the application is hosted Even on this particular node Now this is good news So this means that your application is successfully hosted on the cluster and it’s accessible on all the nodes right now I’m gonna do a Docker node LS And yeah, we have three different nodes It’s the application executed over here if you want to verify that you can also do this docker service LS, okay, it just one application And if I do PS with the angular name with the image name, it says it’s running here Great This is one this is one of the scenarios which I want to show you Okay, but I want to show you another scenario where the application can be hosted on multiple nodes at the same time from the manager Okay, and the command is not going to be too lengthy also Okay So last time what I did I basically executed the container at Right, so that was executed only over here Let me but before I go to the next scenario, let me remove this service Okay, so the command to remove the services Docker service? remove Angular app so when you get this output, it basically means our application has stopped the deployment has been removed So if I try and refresh this folder will report it says it’s unable to find anything there and similarly you won’t be able to find it on any of the other nodes also because the cluster itself does not have access to this particular angular application right now, but now let me go back to what I was talking about the second scenario where I can start the same service On all the three nodes, okay The same dock ourselves, which I created I’m going to issue that with a slight modification So after my port options after this flag, I’m going to use this flag of mode Okay, I’m going to say mode is global now with the help of this flag The application which I am deploying which I am, you know hosting this will be basically deployed onto all of the all the three nodes of mine Okay, we can so I can show you that by first hitting enter and let’s see what the status comes Okay, so we did just take a few seconds because it’s being deployed to multiple nodes, right? That’s the only thing so yeah again, the service has been created This is the service ID Now Let’s do a Docker PS and check and there’s one instance of this application running in this same manager Okay, like before it’s running over here also and let me verify that if it’s running over here this time by running the same Docker PS command Yes, as you can see sounding seconds ago This application was created and similarly if I go to the third VN and run the same Docker PS command It’s opened over here Also, this means that the application this time was deployed to all the three nodes parallely Okay, we can also verify that by going to the foldable reports of each of these machines So this time the app is back up right? It’s running again Same thing I can refresh this And I will see the application coming here Just connecting And similarly over here Also, I will have the same success scenario Okay It’s connected Great This is the movie rating system that is been deployed and all and across all the three VMS Now let me verify this give you the way you can confirm This is by running the docker Service First you do the docker service LS Command Okay So with this you have the more s Global, okay, and it says replicas 3 of 3 that’s because there are three different nodes connected and since it’s deployed to all the three it says replicas 3 of 3, correct The only difference last time was it was one out of one the same as three or three and to give you a for to drill down Further into details as to if it’s running on each

of these nodes we can use the command Docker service PS followed by the application name that is angular app So when I hit enter As you can see it says there’s one instance running on Walker one one instance running on manager one and the third instance running on worker to great So this is what we this is the real fun part with Docker right with once we command you can do all these things So let me also I mean, we just verified this right now now comes the concept of high availability if any of my node goes down then what happens But I still get access to my application over there right that question needs to be answered So, let’s see if that is going to happen So for that Let’s say well my internet of my worker one, right? This is my worker one Right? Let’s say I am I enter my notice down and to get my note down I’m just going to do a disconnect Okay, so right now it’s not connected to the internet And if I go here and do a Docker node LS command, which would list down all the different nodes in my system You can see that The status of worker one is down Okay all this time It was getting we were getting ready That’s because the state is was that’s because the server server was up But since I turned off the internet in my worker one, it’s telling state is as down but in spite of that I won’t have any problems accessing any application, okay? So even though I refresh it you can see that on this port number I could access the application That’s because in spite of the fact that this node is connected to the cluster I can access this Right and the Very fact I can do that is because all the machines are all the nodes in the cluster will have the port number opened, right? It would be exposed between all the other nodes the same concept I explained during my slides, right? So in spite of the fact that my note being down I could do this now this solves one If I availability, right? So in this case, even if I have like multiple nodes going down then some of the nodes which are you know, good enough which are healthy dose can service They those can satisfy all my services for a temporary period of time, but of course, I’d have to bring up my your notes again, right? So this is how one high availability can be accessed that that’s one thing So, let me just go back to my worker 1 and N able internet again Okay, so that I can continue with my demonstration Okay connected now, so if I do a doc or node Docker node LS again? Let me just refresh this Huh? Yes now it says the state is ready Great I’m going to just clear the screen Now since I ran last last command where I did it in global mode, I had an instance running on each of the nodes, right? So this time let’s say I don’t want to do that I have three different nodes, but I want to host the application only on two nodes Well, I can do that Also, I can set the number of replicas of my service over there in the command where I’m starting my service So let me go back to that start command and modify it as per our needs so I’m going to remove this Mode Global Once you remove this flag You can add you can add Replicas and set the number of services you want Okay, but before this I would have to remove the service, right? Sorry, my bad I just forgot to do that So let’s say Docker service remove angular app, so I’m have removed it now and I’m going to restart the service Okay So now let me start modifying this start command So I’m going to remove this global mode and I’m going to say Replicas and I’m going to set the replicas to to now this would indicate that I will have to running instances of this service between the three nodes Okay, it will load balance between the three nodes and the manager will choose on its own It will deploy the application on two of the best performing nodes Let’s verify if that’s happening So yeah the success so it’s successful We can verify that by doing a docker Note PS Okay This would basically less down if the container is present in this node Yeah, there is one container or One servers running over here But to get a detailed to get more details Let’s run the docker service PS command, okay

Let me just clear the screen out and run the command again for you So when I do this it says that two instances have been created right one has been started on my worker 1 and the other husband started on my manager one right two instances between the three nodes Let me also do this just for you Let me do a Docker service LS should to confirm the replicas, right? It says the mode is replicated mode and it’s two out of two, correct So no No hassle anywhere here, right? So if I refresh it, I would still have the angular application hosted This is worker one Its enemies host over here, so I don’t need to verify anything But to give you a confirmation I can do that also by running the docker PS command So the docker PS would list down all the containers and services running in this particular node So when I hit enter I have one entry here, okay for once I was at got started however in this node to the worker to I do not have the application right? So let me verify that by Running the command Docker PS Okay, it’s not running here There’s no service But in spite of that the application would be running here So that’s the concept of Docker cluster wherein all the nodes will get access to what’s there in the docker cluster So that’s the fact And now comes the concept of scaling up and scaling down, right? This is one thing which a lot of people have this doubt because it’s not always done right in spite of having a cluster where you have only three nodes we can scale it up to any number of services that we want to so right now I have a two different Services, right if I do a darker service and if I do LS you can see that there are two Services running now if I want to Scaled up to let’s say five Services I can do that too That would also happen and the simple command do that is Docker service scale and we should choose the application and we have to set the number we want to scale it up to let’s say I want to scale it up to 5 So in this case three more services would be added on to this cluster Okay I’m going to go ahead and hit enter And yeah, so it says the app the application has been scaled to 5 now Let me run the same Docker service list command And when I do that it says right now the three replicas have already been started and let’s give it a time Let’s give it a few minutes so that it can start on all the other nodes Okay, in the meanwhile, I’m going to clear I’ll clear the screen first and I will do a docker service BS and angular app this would tell me on which nodes my applications are going to get deployed So it says out of the five on worker one Yeah, they’re on two of those services will be running on worker 1 Okay, as you can see our service number one This is the service number two, right? This is running on worker one and again on vocal to there will be two Services running You can see the so Services over here worker to and then on manager one There is one server is running This is because I scale it up from two to five Now Let me do a Docker service list command to check if all my replicas or up Yes So we’ve given sufficient time and buying up all the services are up and running we can check it over here, but we don’t need to because we know for sure that it’s going to be hosted anyways, so this is good news, correct So yeah, this is this is how we can easily scale up We can easily scale down and we can achieve a lot A lot of comfort by using Docker, correct? So, yeah, so yeah guys So this come brings an end to my session to my Hands-On session have also showed you how to scale up and scale down I’ve showed you the concept of high availability Also the whole concept of load balancing happened here, but I still there is one more thing, which I also want to add on from my side Okay, and that is why will Services be executed at the managers and write a manager ideally does not Is not supposed to do any work, right? That’s what the workers offered the manager just manages So this is the question that you can come up with It’s a very valid question

So if I want to do that, then I can you know again run this one command and enable that functionality also Okay, and the command to do that is there is Docker node update I can use the availability flag here Okay, and I can say drain and I can choose which node I want to drain So when I saw drain basically stops allocating services to that particular node, which is specified so you over here if I specify manager one then and if I hit enter Then from now on the surface, which is allocated over here, right? This would shut down and a new service will be created on either Walker one or work or two that would happen or if I Want to drain my manager I can also drain one of the workers I can either drain work of one avocado But let’s say for our in our case We want to down the manager so I can do that by simply hitting enter over here And yes, we’ve got this as the return return value That’s great So now if I do Docker service PS angular application, which is the same command you can see that the manager one has been shut down Okay, and there has been an additional service that has started on worker 1 So right now there is worker one running is one two and three so three running on vodka one and these two are running on worker to right So I’m going to clear the screen here and we execute the same command and also show you what happens Now when I do a darker node list, okay, the nodelist will basically lays down all the nodes connected inside that cluster Right? So I’m going to do a Docker node list and over here this time You can see that for my manager one, which is this ID The state is ready However, availability is not active It is drained Okay, even though it is a leader it is brain So from now on if I scale up the servers or whatever I do even if in case of high availability at that time Am I cannot know services will be allocated to my manager unless and until I remove the train Okay, I can you know, remove the drain by again specifying the command of active So let me run that command and show you that so here instead of saying drain if I change the availability to active then I can start allocating services to my manager also So if I hit enter it says I’ve got manager one has the return value Again, if I run the same document LS command availability is there and from now on whichever if I if I scale up at only at that point of time, well my manager start getting resources So these would what are or what our existing right? This will not get allocated to my manager in case of there’s any downtime if any of my node goes on then at that time manager one will get access Right and yeah that would happen So this is the simple demonstration which I on to show you it sounds simple but this solves a lot of Industry issues Correct? It’s one of the one of the best tools I have worked on Docker and Dockers warm is one amazing technology that also have witnessed So I hope you’ve also understood what kind of you know what I’m talking about over here, correct So yeah that brings an end to my demonstration here So before I deep dive into what exactly is Takin it working Let me show you the workflow of talker All right guys So this is the general workflow of talker So a developer writes a code that defines all the application requirements and dependencies in an easy to write dockerfile and this talk of file produces Docker images So whatever dependencies are required for a particular application is present inside this image And then when we run this Docker image, it creates an instance And that is nothing but the docker containers this particular image is then uploaded onto the docker Hub So from these repositories, you can pull your image as well as you can upload your images onto the docker Hub, then from the docker Hub, very steams just a quality assurance team or the production team will pull the images and prepare their own containers, as you can see from the diagram Now these individual containers will communicate with each other through a network to perform all the actions required This is nothing but talk a networking So what exactly is Takin it working So when containers are created these isolated containers have to communicate between each other Right? So the communication Channel between all the containers introduces the concept of talker networking All right So now what would be the goals of Dhaka networking?

So Docker is flexible In other words, I mean pluggable by flexibility I mean that you can bring in any kind of applications or operating systems or Any kind of features in Docker and deploy them in Docker next door can be easily used in cross-platform by cross-platform I mean, you can have n number of containers running on different operating systems, like one container can run on the Ubuntu host other container can run on the window host Etc like that Right so you can have all these containers work across with the help of swamp clusters After that we have doctor offering scalability as talker is a fully Booted that work It makes the applications grow and scale individually, then we have talker using decentralized network this enables the capability to have application spread and highly available So in the event that a container or a host suddenly missing from your pool of resources, we can automate the process of either bringing up additional resources or passing over to the services that are still available apart from offering the decentralized network We have talked of being really user-friendly so doctor makes it really easy to automate the deployment of your services or containers that would mean a make things easy for you in your day-to-day life And finally we have darker offering out-of-box support So the ability to use talk Enterprise Edition and getting all the functionality is very easy and straightforward make stock a platform to be very easily used So those with the goals of Docker networking now to enable these capabilities we have the container Booking management and to do that we have to live Network Now What is this live Network select network is an open source in which you can read through the source code and you can automate all of that as an open source So left network is basically a talk library that implements all of the key Concepts that make up the CNM model Now what exactly is this container Network model? Well contain a network model formalizes the steps required to provide networking for containers while providing Being an abstraction that can be used to support multiple network drivers So CNM requires a distributed key-value store, like console to store the network configurations The container Network model has interfaces for ipam plugins and network plugins The ifan plug-in apis are used to create delete address pools and allocate or deallocate container IP addresses, whereas the network plug-in apis are used to create or delete the networks and add or remove the containers from Looks I’ll continue Network model is basically built on three main components the sandbox endpoints and the network object itself So a sand box contains the configuration of a containers Network stack just basically includes the management of the containers interfaces routing tables and DNS settings Now a Sandbox may contain many end points from multiple networks, right and then point is something which joins a Sandbox to a network endpoint can belong to only one a network but may only belong to one sandbox and finally as I was talking about network network is a group of endpoints that have the ability to communicate with each other directly Now that you know a brief about the container Network model Let me tell you the various objects involved in this model the container Network model comprises of five main objects the network controllers drivers Network and point and sandbox starting with network controller Network The object provides the entry point into the lip Network that exposes the simple apis for users such as the docker engines to allocate and manage networks since lip that work supports multiple active drivers both inbuilt and remote network controller allows users to bind a particular driver to a given Network Next comes driver driver is not a user visible object but drivers provide the actual implementation that makes the network work Driver can be both in built-in remote to satisfy various use cases and deployment scenarios The driver owns the network and is responsible for managing the network which can be further improvised by having multiple drivers participating in handling various Network management functionalities after the driver object We have the third object as network network object is an implementation of the container Network model as I said Network controllers provide apis to create and manage the network Object whenever a network is created or updated the corresponding driver will be notified of the event the lip Network treats Network object at an abstract level to provide the connectivity between a group of end points that belong to the same network and then also simultaneously isolate them from the rest the driver performs

the actual work of providing the required connectivity and isolation The connectivity can be within the same host or across the multiple hose after that the next object That we have is endpoint as I discussed before and point Maley represents a service endpoint So it provides the connectivity for services exposed by a container in a network with other services provided by other containers in a network So the network object provides the apis to create and manage and points and an endpoint can be attached to only one network since end point represents a service and not necessarily a particular container and point has a global scope within the cluster as well And finally, we have the sandbox So the sandbox represents containers network configuration such as the IP address Mac address roots and DNS entries a Sandbox object is created when the user request to create an in point on the network the driver that hand us the network is responsible to allocate the required network resources such as the IP address and pass the info called a Sandbox info back to the live Network So the lip network will make use of the OSP Civic constructs to populate the network configuration into the containers that is represented by the sandbox So a Sandbox can have multiple endpoints attached to different networks Alright guys, so that was a brief about the various Network model objects Now, let me tell you to various network drivers that are involved in Dhaka networking Dhaka networking has mainly five network drivers involved with it the bridge host None overly and Macklin Network So starting with the bridge Bridge network is the default Network driver So if you do not specify a driver then this is the type of networking you’re creating So the bridge network is a private internal Network created by the docker on host All the containers are attached to this network by default The containers can access each other using this internal IP And if it is required to access any of these containers from the outside world, then port forwarding of this containers is performed to map the port onto the docker host East Bridge networks are usually used when your applications run and Standalone containers that need to communicate Another type of network is the host Network This removes the network isolation between the docker host and the docker containers and then it uses the host networking directly So if you were to run a web server on Port 5000 in a web app container attached to the host Network, it is automatically accessible on the same boat externally without requiring to Is the port as a web container uses the host Network? This will also mean that unlike before you will now not be able to run multiple web containers on the same host on the same port as to put are now common to all the containers in the host Network The third option is the none Network The containers are not attached to any network and to not have any access to the external network or the other containers This is usually used in conjunction with a custom network drive Over and is not available for swarm Services The next Network that we have in the list is overlay Network So to understand this network Let’s consider a scenario Let’s say we have multiple doc host running containers each talk a host has its own internal private Bridge Network in the 172 Point 2 point 17 series allowing the other containers running on each host to communicate with each other However containers across the hosts have no way of communication with each other unless Published reports on those containers and set some kind of routing yourself This is where the overlay Network comes into play with Doc is warm You could create a new network of type overly which will create an internal private Network that spans across all the nodes participating in the swamp cluster We could then attach the containers or services to this network using the network option while creating a service and then we could get them communicate with each other through this overlay Network so you can see that That you can use overlay networks to facilitate communication between a swarm service and a standalone container or between two Standalone containers on different docherty mints And finally we have the last Network That is the Macklin Network So Macklin networks allow you to assign a MAC address to a container making it appear as a physical device on your network Then the talk a demon Roots traffic to the containers by the Mac addresses And then the Maitland driver is sometimes the best Choice when dealing with Legacy applications that expect to be directly connected to the physical Network rather than routed through the docker host Network stack So guys that was about the waitress network drivers Now, let me brief you a little bit about talk a swarm and tell you the significance of torque a swamp in Dhaka networking in simple words

If we have to Define doc a swamp then doc a swarm is a cluster of a machine or running on Docker this provides scalable and reliable platforms to run many containers Owners which enables the it administrators and developers to establish and manage a cluster of Takin notes as a single virtual system So as we know that Docker swarm is a technique to create and maintain cluster of talker engines What exactly is this cluster of talker engines? So let me tell you that in a cluster of talker engines There will be many Docker engines connected to each other forming a network this network of talk engines is what is called as a Docker swamp cluster as You can see from the diagram on the screen and this is also the architecture of taka swamp cluster So they will always be one doctor manager In fact, it is to talk a manager which basically initializes the whole swarm and with the manager They will have many other notes on which the server should be executing So there will be times when the service is also executing at the managers and but the managers role is to make sure that these services are the applications are running perfectly on the docker nodes Now whatever applications or services that are specified or requested, they will be divided and then they would be executed on different notes as you can see in the diagram here So these different notes are nothing but the workers Alright guys, that’s all you need to know about Docker networking Now Let’s move on to the Hands-On part in a Hands-On part first I’m going to show you how to create a simple Network and how to deploy the service over your network and after that will create a swamp cluster and then we’ll connect to services and And we will scale a single service Alright, so let’s get started with our hands on so first we’re going to deploy an application named apache2 by creating a Docker service in the default Network That is the bridge Network So apart from that will also initialize the swamp cluster as we want it to work on two different nodes That is the manager node and the worker node So for that let me open my terminal and then let me type in the command sudo talker swarm in it – hi – advertise – addr and then mention the IP address, right? So I’ll mention the IP address of the manager node And then I’ll click on enter Once you click on enter you’ll be asked for the password So type in the password and then you can see that the Swarm has been initialized now to connect the slave node to this particular manager You have to copy this link and then go to the sleeve note open the terminal and then paste it here so you can see that this node has joined the Swarm as a Look up so that is the manager and this is the slave now Let’s go back to the manager node and over here We’re going to deploy an application named apache2 by creating a Docker service So for that you have to type in the command Docker service create – – name give the name of the application – – more that is which more we want it to work We want you to work in the global mode – d – P that is port forwarding And then we’ll mention the port where it’s going to work So it’s going to work on 8 0 0 3 and then mention the account name from which the docker image has been pulled So once you click on enter you can see that your doctor service has been created now to check whether your doctor service has been created a lot You can use the command Docker service Ellis So this will list all your running services at present We just have one service that is apache2 now to check whether it is running or not You have to go to the slave node And then open the web browser here and then let’s go to the Local Host to the port a 0 0 3 So let’s go to the port So you can see a message that it works So that means our application has been deployed onto a container and then it is also connected to the swamp cluster So the worker also has this particular application now if you want to deploy a multi-tier application in a swamp cluster, how will you do that? So let me show you how to do that So before I do that, let me tell you what are we going to connect? So basically we have two applications That is the web application and the mySQL database So the web application has two parameters Is that is the course name and the course ID and once you mentioned the details and you click on submit query it will be automatically stored in the mySQL database This multi-tier application is connected with each other through the overlay Network So let’s start doing it So first, let’s create the overlay Network So for that you have to type in the command Docker Network Create – D overlay my overlay one So my overly one is basically the name of the network that I am giving you can give any other name that you want after that Let’s create a service for the web application So for that I’ll again type

in the command Docker service create – – name name of the application as web app one – d – – Network and will connect it to my overlay one network and then – be for port forwarding and then we’ll mention the port on which it is going to run and then we’ll mention the Account Details from which this Docker image will be pulled So after that you can just click on enter so you can see that you’re talking service has been created So let’s check it once again So for that you’ll type in the command as talk a service Ellis So you can see that the web app one service has been created now, we’ll create another service for the MySQL application So for that you’ll type in the command Docker service create – – name MySQL that is the name of the application – d – – Network the network to which we want to get connected is my overlay 1 – P for port forwarding Let’s mention the port and then the account details for that You mentioned the Account Details So you can see that your doctor service has been created So let’s check again So for that will type in the command Docker service Ellis and you can see that the MySQL service has been also created Now, what you have to do is you have to go to the web application and inside which you have to make some changes So to go inside the web app service You need to know the container ID So to know the container ID, you have to type in the command Docker PS So this will list all the container IDs that are present on this node so you can see But up one and a bash you two are present at present We need container ID for web app one, right? So to go inside this container, you’ll type in the command Docker exe see – i t and then copy this container ID and then paste it here and then end the command with bash so you can see that you’ve gone inside this container Now, you have to go to a file index dot PHP and make some changes So for that we will type in the command Nano and mention the directory So this PHP file opens up now, you have to change the server name to mySQL since we want to get connected to the MySQL server and then change the password to ADT Eureka and let’s say we keep the database name as Hands-On after that use the keyboard shortcut Ctrl X, press on Y and then save the file So once you’re done with this, you have to exit the container so for that type in exit and you can exit the container now You must have observed here that only the web app and the Apache to Services can be seen on this node Whereas we are not able to find the MySQL that is because it is present in the slave node So let me show you there So let me go to the terminal type in Docker PS and you can see that the MySQL service is over here So why is that? So that’s because swarm is performing load balancing It is dividing its containers into two different notes so that you can balance the load properly So now what you have to do is you have to go inside MySQL container so for that you’ll type in the command Docker exe see – i t and then mention the container ID of this particular container and then end the command with bash So you’ll go inside this particular container now, once you’re inside this particular container, you need the access to use MySQL commands So for that you’ll type in the command MySQL – you route – P Ed Eureka So once you type in this command, you can see that you have got the access to use the MySQL commands So – you is basically the user and – P is for the for the password and if you have a question that why were using – it here that’s because we are opening the container in the interactive mode So once you get the axis of MySQL, you have to create a database and then you have to create a table inside it so for that you’ll use the MySQL commands such as create database Hans on And then you have to use the database So for that you’ll type in the command use hands on So you can see a message that the database has been changed Now, you have to create a table So for that type in the command create table, let’s say courses is the name of the table and then mention the two parameters So we have course name which is of where cat-type Let’s say, it allows a length of 15 characters and let’s say we have course idea of where cat types of 12 characters and after that close the bracket and this creates a Able for you after that you have to exit your MySQL connection So for that you’ll type in exit

and then you have to again come out of this container So again type in the command exit and you’ll be out of this container Now, what you have to do is you have to go to the slave mode and then run this index dot PHP file So for that let me open localhost since the web application service was running on 8 0 0 1 and index dot PHP file All right, so you can see that our doc a sample app has been opened up now before you include the details Let me go back to my web app container and let me show you what all has changed in the file So you have to mention the server name to be MySQL your username to be root password to be your password and then database what I’ve mentioned there that is Hands-On and the name and ID would be the parameters that are would give so it will be course name and course ID and then you have a basic PHP file in which you cried the SQL command that in certain Took the course name and the course ID which will basically include the details that we fill into the application to be stored directly into this table Now, let’s go back to the slave node And now let’s mention some details So let’s say we mention a detail to be blockchain and the course ID to be randomly some number and then we’ll submit the query once you submit the query you can see that a new record has been created successfully So let me just create few records Alright, so I’ve typed in few records Now Let’s go back to a MySQL container and get into the database and see if a table has all the records entered store or not So let’s go back to the terminal So now let me type in the command Docker PS and then I’ll type in Docker exe see – it mention the container ID now I’ll type in the command MySQL – you route – P Ed Eureka So this will give my MySQL connection So now I’ll type in the command as use Hands-On So database has been changed now I’ll type in the commander show tables So it Will show me the tables that have included in database, so I have this table included Now Let me type in the command select star from courses So this will basically lists all the details that are stored inside this table So you can see that we have entered so many details with the help of this web app and that would directly stored into a mySQL database So guys, that’s how you can you know, connect multi-tier applications over the overlay Network now if you want to scale any particular This you can just scale that service by using a simple command So for that you have to go back to your manager node, and then use the command Docker PS to list all the containers light So we have two containers Let’s suppose we want to scale this web app service for around five times So you can do that with a simple command that is stalker service scale web app 1 is equal to 5 so you can see that the web app one service has been scaled to five times Now if you want to check whether it is working or not, you just have to type in the command Docker service PS web app one so you can see five instances of the same services So guys that’s how you know, you can deploy a simple application over the default Network and also connect multi-tier applications with an overlay Network And finally you can scale any particular services So guys that was a short demo on talking networking The project that I’m going to show you that of an angular application, which is created by my team and what I’ll be doing is I’ll be deploying this angular application by implementing the devops strategy The first topic that I’m going to talk about today is what is angular and after I talk about angular and give you an introduction I’m going to talk about what is devops, right? So this is going to be very brief I’ll quickly talk about these two things and then I’m going to go to the third topic which is the different devops tools and techniques to achieve continuous deployment because this is the highlight of today’s session I will be spending a lot of time on this slide and on the final slide, which is continue Rising an angular application the devops way and the divorce we basically includes a combination of these three tools get Jenkins and Docker All right guys, so enough talk Let me get started with my first topic and that is what is angular So angular is an open source, client-side framework for deploying single page web applications, right and the keyword that you need to note here is single page applications And that’s acronym Das es PA There are quite a few Technologies for developing single page applications So anger is a very popular one react.js is another popular technology similarly vue.js and we have a couple mode and well the thing

that you go to ask me here is why single page applications right? So you You might ask Why are we why am I having a demo one single page applications? Right? Well, the answer for that is because single page applications are the way forward They are more effective and they are easier to build and they come with a lot of other benefits that that I of course convention today’s session because they’ll get to detail but I do have a couple of been a beneficiary of that are mentioned on the slide and you can see that on your screen now And the biggest reason under under most important factors single page applications, which are Reno created by Technologies like angular and the other JavaScript Technologies These applications are really fast and they are fast because while accessing any webpage which is developed in angular or such technologies that I’m your browser will fully render the entire D om in one single time and later on it only modifies that view or the content display to you when you interact with that web page Great, and even these modifications will be done by the JavaScript which runs in the background And yeah, you can see an example of an SP architecture over here Right? So you have so any anyway, basically any web application which is developed, you know with the help of angular, right? So they’ll be called single page applications and they’ll have three different components First of all or well let’s not say three components in my example It’s three compounds but General they’ll have different components and the components that you can expect there to be are those of a navigation bar where you can switch from one one tap to another tab, then you will have a sidebar right again you Now filter down to different options that you want to be displayed and then of course, you’ll have a Content you’ll have a Content bar, right so similar to how we have a sidebar will have another component called the content which will be the actual display So whatever you’re actually viewing on your you know on your web page that will be displayed over here And what is displayed here can be controlled from here by clicking on the different information or you can also control that by switching or clicking on a different option in the navigation bar or in the sidebar So So you can switch you can switch the view the view like that And when when you do it this way, your browser will not take too much time to fetch the information from the server because the entire Dome will be felt at one goal So that’s the big benefit with single page applications and especially angular implements, you know anger is used for developing single page applications That’s why it’s the way forward and its really popular and it’s you know, the technology is really coming up So my team has developed developed a single page application using angular and that’s what I’m going to deploy today, right? Now let me quickly go to the next slide and talk about what is devops here Right? I’m sure everyone here knows what devops is it’s a software development approach which involves continuous development continues testing continuous integration continuous deployment and continuous monitoring of the software throughout its development lifecycle Well, I’ve mentioned this numerous times my video sessions and I expected to know this Okay, but what I what you might not know is which of these tools are used for continuous deployment Right So on a higher level I can see that Docker is most important tool for achieving continuous deployment Okay, but as you can see on the screen, I will also be showing the act of continuous development and continuous integration in today’s session So continuous development is achieved with the implementation of git and GitHub continuous integration is achieved with the implementation of Jenkins and continuous deployment is achieved with the implementation of docker Well using GitHub you can pull the code from the repository, right and then using Jenkins We can deploy that code to the production environment or the servers or virtual machines whichever suits you and then finally we can make use of Docker to containerize those deployments So that’s how the different the devops tools that you see here get Jenkins and Doc up That’s how they can be orchestrated to achieve, you know Automation and you know for software development So that’s how things go and in my anger application I’m going to use these three tools right these three drops tools Now moving on to the next slide Now this slide which is all about deploying an angular application This is the most interesting slide in today’s session and you can ask me why and the reason for that is, you know, the reason it’s interesting is because we are using Docker majorly, right? We are pulling all the code from get and then we are using Jenkins integrated into darker and we are creating multiple containers by using Docker Basically Docker container sizes application along with all its dependencies, right and when we say contain arises It means that we are packaging the code of the application along with all the required packages and dependencies in a lightweight manner, which is not too heavy on the server on which we are deploying the application tool, right so and the best part with these Docker containers are that they can be run on any operating system irrespective of the one it was built on

Well what that means is I can containerize any application in my case Well, let’s it in my case I have the angular application Right? What kind of dependencies will my angular application app the see that your angular application would primarily need are those of node.js node package manager, which is again sync acronym Das npm And of course the package dot Json file, right? So no DS is basically going to be the back end for your angular application and p.m Is going to install and angular application and maintain all its dependencies and the versions of those dependencies and the package dot Json file is again the most important file right because it’s going to contain details about your project about watched what Dependencies are needed and what versions of dependencies are needed all these things will be present in your package dot Json file So basically these three files will be the dependencies and in my case, what I can do with help of container is that you know, I can have a container I can install all these dependencies I can place them all together and I can simply you know, you know without having an operating system that’s actually powering it You know, I can package all these things into this particular container and I can just you know, share it with The people and what the other people have to do is they just have to you know run the container and they can just boot it with the help of any operating system Right? So that’s the benefit with containers so developers can containerize any app that’s created in a Mac operating system and probably they can upload that container or image to Docker Hub and someone in remote location can download that Docker image and you know, it’s been a contender out of it while the personal that’s remotely located while he’s having a different operating system The guy who built the application right who sorry who built the docker image, he could have been he could have done it using a different operating system and the guy who’s actually running the container at you know, a remote location We can have a different operating system So that’s the big benefit So you guys are getting the advantage that lies you’re right with the help of Docker and with the help of continue Rising all your applications and dependencies – the actual operating system Okay So anyways, I think it’s time to move on and now I’ve reached my demonstration aspect right? So now that I’ve told you what exactly is what I’m going to do, right that’s going to be the architecture of how I’m going to deploy my angular application Now that you know it I’m going to start with my demonstration and what I’m going to do is I’m going to do it with the help of continuous deployment using Jenkins a Docker and we will also use GitHub from where we will be pulling the code right? So let me first of all open my Machine for that So first of all to achieve this continuous deployment like I told you Jenkins is the broker, right? So Jenkins is the one that pulls the the code from the repository and that is what which is going to help us build Docker images and spell containers out of those images So what I have to do is have to first of all open my web browser and launch my Jenkins Jenkins the dashboard, right? So Jenkins is by default hosted on port number 80 So let me just Lon CH that particular web, you know Lawns at Port number on my Local Host Sorry for the delay guys It’s lying a little bit Right, so just the port number by Jenkins is hosted Now in the meanwhile, let me just quickly go to my terminal and so we my project folder where my actual application is present so here’s a dominant and my project is present in this folder I’ve created a demo folder inside which there’s a top movies, right? So the top movies is the project which I created the project folder and what you see here These are the different files and folders present inside this project folder Let me also open it to my file explorer here and explain what these different packages files and folders are Forum So this is the project that I created and as you can see there are a number of files are and the number one file that I want to talk about Is that of a Docker file right now the Profile is basically used to build your Docker images and spend containers or of those Docker images, right and to build your Docker images you specify the commands inside the dockerfile, right? And then you just you know, execute that Docker image which is built by issuing the drunk command that I’m your Docker container would be spun and that I’m your container would be ready and your application will be hosted on a particular port number and then would be put to a it would be mapped to a particular port on your local looks so all these functionalities are done with the help of Of dockerfile, okay now but that is only with respect to Docker

and the other things here the other folders and the files that you see here These are with respect my angular application So we have different files like the package.json file We have known underscore modules We have done we have SRC folder So all these things well, first of all, let me talk about the package.json file right now this package or Json file is a very important file which contains all the details about my project it contains which version of which Which dependencies my project needs words the name of my project what versions of dependencies my project needs to implement? All these details will be present inside my package.json file So without the package or Json file your application cannot get hosted its you know, for those of you on you can consider this to be like the metadata, right if we will know what is the metadata So baggage out Jason does a similar role right? But here comes the question How will the package.json file be initiated right from? How do you Acute the package.json file What’s the first step? And that’s where this whole node underscore modules folder comes into the picture Right? So you have a command called npm install, right? So npm install is nothing but n PM stands for node package manager, right? So it installs all the dependencies that your project needs and when you run the command npm install through your terminal, so at that time it will look for the package or Json file in that particular directory So I have to execute the npm install from the A tree where my package or Json file is present from your if I execute that command that I’m it would first fall initiate the package.json file and whatever dependencies are present over here for my project for my code All those would be installed and downloaded and installed from from the node repository right in my case would be no order no repository But yeah, otherwise it you just downloaded from the internet and you would have it already and all those dependencies will be present inside this folder called node underscore modules Right and this this folder node underscore modules is going to be a very heavy folder, right? There’s gonna be a lot of content here So it’s ideal that you know, you don’t place it in the GitHub If you want to share your project with someone else you I’d you in the real world environment What happens is you just share the package.json file and when they do the npm install the time they would you know, automatically get all the dependencies installed as per the package dot Json file, whatever specified you so that’s what it does and then you have other files You’re right the configuration files like Protracted odd configuration file you have the typescript configuration file typescript lint configuration file and you have the other other files are so guys All these configuration files are the configuration for your angular applications right beat the typescript configuration or the linting configuration of the protractor All these can be considered, you know, basically, these are of the boiler plates that come with the actual angular application So that’s these are these are dependencies, right? So you need it with your project and and the folder SRC So this is where your actual project would be present So what about code you’ve written for your Android application that will be present here So yeah, these are basically the contents of my repository and these are what is needed for continue Rising my angular application and maybe you would find you know, you have not explained this folder ID to e, so this one basically, you know is used for, you know, the end-to-end testing So whatever is needed for that it’s president This package up But yeah on a high level this is what you need to know These are the packages And the first thing that I got to do is to to do containerize this application The first thing I have to do is after pull the code from our GitHub repository and I will do that with the help of Jenkins, right? So even though I have it locally in a real-world environment developers or you know Engineers would we would pull this code from GitHub? Right? So I will show you how that happens by first of all going through my Jenkins dashboard here This is my dashboard I already have a object called demo So this is the one that I want to show you a demonstration of so this contains I’ve already pre-built the environment so that I don’t waste much time and no downloading everything and you know, because downloading everything and installing everything would take a lot of time So if I have the environment ready I can just shoot you straight away So I have it over here and if I go to configure I can show you what are the elements that have defined already? So let’s just wait for this to come up for a minute First of all, we have to go under the source code management, right? So this is where you need to first of all enter the GitHub repository from where you want to pull your code right now Let me just open this repository and show you what I’m going to pull It’s basically the same content that is there in my local host in my in my whole system, right? So whatever whatever you saw here are the file explorer Most of the contents over here are there in my GitHub repository except for the node modules because this gets installed automatically when you run the package or Json file Yeah, so you guys see this right?

So we have the same Adobe folder we have the SRC folder and then we have various other files like the angular CLI Jason we have the docker ignore We have the dockerfile that’s present while the docker file is present inside the GitHub repository The reason I have I have the dockerfile inside the the GitHub repository is because wherever my code is present, right, so that’s where my execution should ideally happen And if I have my dockerfile present in the same directory Then I can run my dockerfile I can use my dockerfile to build my Docker image inside that repository and it will also look for the dependencies and the angular code for my application all these things from the same repository So that’s why I have the dockerfile in the same Repository Right, so that’s what doc file is used for and then similarly we have the other dependencies like the package dot Json the 80s conflict got audition the other things which I spoke about which was there over here So the same thing we have in our GitHub repository So getting back to our Jenkins Be forceful specify that you want to pull the code from here And what we do next is we can go down to the build option So under build we have our shell here, right? So whatever commands you specify here, they would be executed on your shell So since I am using a Linux system, I have chosen to execute these commands on my ex on my shell well in case you guys are executing it at your end, you know, if you’re using a Windows system, you might probably want to choose Windows batch command and then specify the commands that you want to run a new windows CLI, right, so that’s the only difference but yeah, whatever commands I specify here They will be run on my shell and the commander And first of all running is that of Docker build and building the image called demo app one So right now I’m using the dockable – t flag T command to build a new image called demo app one and it would build this application based on the dockerfile which is present in this folder So this is the folder where my dog Is present right so I can you know, in case I do a CD and if I give this folder then I would have moved to that particular directory and then I can just simply replace this path with a DOT So that’s another alternative But yeah, otherwise, you can specify the entire absolute power also here So I’ve done that and it’s basically creating a new image based on the dockerfile and the instructions present inside the dockerfile in this command And then in the second command is the docker run command And okay, so the image was created your demo app one So that image is basically being run Okay, you spend on an image into a container by running this command Docker run and you specify other options while doing this, you know, we specify flag flag RM we specify single flag copy and then we specify the port numbers So the the pflag is used for mapping your Docker containers put to your host machine sport so over here the photo double zero that you see here This is the port number of my yard Host machine on which the subsequent or the equivalent port on which my Docker container, right? So whatever is basically president medical container the port number whatever was hosted at that would be visible inside my photo double zero port in my your host system Okay So yeah, it’s an angular application right? It’s a web application So what you have to do is you have to host that and one of the ports and I have see by default angular applications are hosted on port number 4 double zero and I have also specified The same in the package dot Json file So that’s where you specify the path the port number and what I’m saying here is whatever is running inside my Docker container in port number for two double zero, that should also be visible or available in the port number 4 double zero of my host machine So that’s what the flag is transferred And then we have the name of giving I’m giving this container, which I’m building I’m giving it a name top movies one And yeah, this is basically the image same image that we are First of all spending with head buffer dockerfile So these are the two common that I’ll be running and at this point of time if there are any any of you who are new to Jenkins or you are if you are new Docker if you execute the same commands from your you know, execute shell you might have a problem So can you can anyone can any of you guess what that problem might be right so I can give you a hint the problem would lie over here Okay, so it would lie right at the beginning of this command Well, no problem See the thing is any Docker command that has to be run It has to be run with the pseudo axis Right only a root user can only the root can execute any document especially the build

and the Run command Okay, but there are some few commands which can be executed without the pseudo but these two commands especially needs to access if you’re excluding the same two commands from your terminal then you can just simply, you know, prefix this whole command with sudo here and then the shell would prompt you for the password and then you can The password but what would you do in case of Jenkins? Right? So this is Jenkins You cannot know put pseudo here because Jenkins cannot manually enter the password for root access, right? So root credentials Jenkins does nap So in this case, what you need to do is you have to give the pseudo credentials or the root credentials to Jenkins itself So Jenkins is actually a user if you guys notice if you go under you know, if you if you know, or let me just tell you this Jenkins is a separate user because it’s a web server, right and any commands that you execute through Jenkins, it would be executed as the user Jenkins So what you have to do is similar to have you, you know, use us, you know, you execute commands without pseudo how you create a new Docker group And you add your user the user from which are executing you add that user to the group similar to that You have to add your Jenkins user to the docker group and you should give the dog a group The Root axis So the docker group would basically be on par Through in terms of the access that it has over the system So that’s the important step that we need to do because otherwise if you don’t enable this axis, then your current your commanders are going to get executed It would say failure permission denied So that’s the thing And yeah, if you have these two were ready then it’s pretty much ready, right your dockerfile would be you know used to build the image and then that image would be used to get the container out So I’m just going to save this and quickly show you how to build this application Okay So to build the application we can simply go to build now, right? You can see the build history or these are the previous times I run the same command and if I do it again bill now just build a scheduled and do it see a new-build pop up over here build number 212, right? So if I click on this and if I go to console output over here You’d get to see what is the status of this build So let me just go here Yeah, if you go to console output, you will get to see what’s happening So similar to the output that you get on your terminal something that you’ll get over here Okay, we’re here already So let me just quickly go up As you can see the first set of commands have started executing using your you know by Jenkins and you know the first of course the first one was to pull the data the code from get right there from the git repository So whatever was there is being fetched over here And then the First Command that we’re executing on the shell can be, you know differentiated with this command the plus symbol basically indicates that it’s command as being executed on the Champs the command prompt so the comma the docker build – t demo app is the command that’s being built and when you build it you can That there are various steps being performed So for each line in your dockerfile, there will be a step that will be performed Now Let me quickly go to the dockerfile and explain what are the different steps that are going to be performed Okay So at this point of time, I’m going to go back here and let me open the dockerfile and explain the different steps Because if we want to host a note, you know, if you want to host an angular application we have to first of all Bill pulled a node image, right? Your angular application would be present or you know, it would be a hosted only with only when there’s a load application which is running at the back end So the First Command that is from it’s going to pull the node image which has the tag 6 right so version number 6 of 4 node, so probably this is what is going to get pulled with the help of from node 6 and when it pulls Then what do you call it was you have to use the Run command to make a directory inside this particular image So you use the – pflag to specify the path that you want to create / user / Sr C / app So you’re creating this particular path inside your Docker image, which you pulled and then you’re changing the working directory to the path that you created by using this command working work dir and this and the first thing that you got to do that you need to notice here is Is the package or Json file which is are present in my local system that I’m moving to my path, which I created inside my Docker image now that is because this is the file that contains all the dependencies that are needed to to do basically download all the node and a node node modules, right? So what about dependencies are are there inside the node modules? They will be downloaded with the help of package or Jason So right now it’s present in my local system am specifying that so stirring Docker to copy this file into the A patio and then when your once you’ve done that it asked me to run the npm cash clean now,

if you are, you know running the npm install for the first time or if you’re using npm the first time you might not need it but since I’ve run this command earlier and the using it because I want to avoid any version conflicts between the different dependencies Right? So dependencies can be afraid of different versions of angular 2 version or angular for version on all those so I’m just using this two different to to you know, keep myself healthy there and Then I’m using their run npm install So this is the most important command which would basically start everything So the npm is the node package manager And when I the moment I issue this command my package dot Json file would be searched for and one it’s located the commands there the dependencies which are there inside those would be created inside a Docker modules, right? Sorry node modules inside that folder Everything would be created So that’s what this command does And all the next command is all about copying every single file or folder which is present inside my you know, instead of my host directory that I’m copying it into my host folder So the other files that are those of configuration files that I spoke about earlier, the the typescript configuration file, the typescript lent files are all those applications will also be copied to this image inside my door, you know to this path instrument Docker image and then I’m finally saying expose for the for to double zero because this Port on which my angularjs application would be hosted and then I’m finishing it off with by specifying this command of npm start So you do the npm install here So at this point of time your dependencies are ready Everything is ready to be your application is ready to be deployed and hosted and the start is what is going to actually do the hosting on to this port number for to double 0, right So that’s what the the dockerfile instructions are and the same instructions have been Earning on my Jenkins So it says Step 1 of 9 It’s pulling from here and it’s moving to this directory and it’s you know, creating a new directory moving the working directory to this and then copying the package So each and every path step is being executed one after the other if any of them fail, then you would have a notification saying this step failed and check your command So all those details but anyways since ours is a successfully built This is the idea of my image, which was generated, right? And yeah, this is the tag And added to it and the next command that’s being run from a shell is the docker run command with the – – RM flag and the pflag right the same command which I explained earlier And when this command is executed it says that your energy source is being hosted So this is the Local Host Port which are mentioning on which I wanted to run and you can see the state as you’re right It says zero percent 10 percent here you have again, you know 10 passenger and we are basically it keeps increasing So we have 11 percent So it’s a big process So there’s a lot of dependencies that gets downloaded and in the meanwhile that we saw the dockerfile that I was expecting the dockerfile We have all our packages downloaded and installed and your applications actually hosted So it says webpack compiled successfully, right? So this is the success message If I now open the localhost photo double zero, then you would see that my angular application is running up and running Right, so you can see that the application name is movie rating system And this is something that can tell you This was the application which my team created for me and this apple This project is all about no the top 250 movies that you have to watch before you die Right some of the you know, the biggest blockbuster hits of Hollywood So all those are present here, you know, the it’s it’s the anger you will get the angular feel over here by looking at the different components So the log out Option that you see here This is a different component Right? If I log out then I will add not get to see the list of movies But if you login only then you will get to see that right and then you have the navigation bar You are where you can switch to different tabs You can go to the it reca home tab You can go to the you know the about tab where again we have weather details and then if you login successfully then, you know, you will get to see the the movie list that we have So let’s just wait for just to log in and I can show you the movie list that we have Yeah, so you had a movie list here, right? So in the navigation bar, let me just click on this movie list and you can see the 250 movies that we choose are You know, I have been the best ever Hollywood movies Yeah, so the number one movie that you have to watch is the Shawshank Redemption, right? And then we have all movies like Godfather

the part 2 of Godfather Dark Knight Will agreement Which again is my favorite movie We have Schindler’s List We have a number of movies here which you know, which is a favorite of course and we’ve created an application this way and this is a simple web application a single page web application that we created and you can create all these things if you know, you know how to work with the node.js and if you know how to work with angularjs Right similarly similarly If I go to the Erica tab, we have details about a drink over here So, you know, we believe in Tech up your skills ReDiscover learning so we have that, you know live classes and expert instruction So these are the this is the interface that we built that we created in our application and that’s what I want to show you and in the movies list again, I mean, of course we have the list of movies and if you click on any of the movies, you can look at the details of that movie as in when it was released What is a John of the movie who was a director actor writer who are the actors in the movie and what readings it has got so whatever data we have here with respect to ratings and right around Stars These were basically, you know, you know basically got from IMDb, right? So it was those I’m going to be ratings at you know, we are using as dataset in today’s session We are going to discuss about the two most popular devops tools, which is Jenkins and darker and we are going to see how these tools can be Created to achieve a better software delivery workflow So first off let me run you through today’s agenda first We are going to see what exactly Jenkins is and how it works Next We’re going to see how dark or solves the problem of inconsistent environment by contain advising the application Once we’re done with that We’ll briefly have a discussion on microservices because on the Hands-On part I’m going to deploy a micro service based application by using Jenkins and Docker now after you’ve got a brief idea about microservices, we’re going to Look at a use case and see how to solve a problem statement by using Jenkins and darker And finally, we’re going to move on to the Hands-On part where we will deploy a micro service based application by using Docker and Jenkins So guys, I hope you find the session interesting and informative Let’s get started with our first topic now before listing down a few features of Jenkins Let me tell you some fun facts about Jenkins currently There are over 24,000 companies, which use Jenkins to Some of you that is Google Tesla Facebook and Netflix Now there has to be a reason why such reputed and successful companies make use of Jenkins Now, let’s discuss a few key features and see why Jenkins is so important All right Now, the first feature is that it is an open source freely available tool which is very easy to use It has various features like the build pipeline plug-in, which lets you graphically visualize the output and apart from that There is also a feature known as user input which lets you interact With Jenkins All right Now one major feature of Jenkins is that it implements continuous integration Now what is continuous integration every time a double up or commits into a source Control Management that commit is continuously pulled built and tested using Jenkins Now, how does Jenkins do all of this now? Jenkins has over 2,000 plugins which allow it to integrate with other tools like darker get selenium Etc So by integrating with other tools it make sure that the Fed development process is fully automated All right, so it is also an automation server which make sure that the software delivery cycle is fully automated Now, let’s see how Jenkins works So here you can see there is a group of developers committing the code into the source code repository Now every time a developer makes a commit is stored in the source code repository Now what Jenkins does is every time a commit is made into the source code repository Jenkins will pull that comment build it test it and deploy it by using plugins and other tools All right now not only is it used for continuous integration It can also be used for His delivery and continuous deployment with the help of plugins So by integrating with other tools, the application can be deployed to a testing environment The user acceptance test and load testing is performed to check the application is production-ready and this process is basically continuous delivery Now, it can also make use of plugins to continuously deploy the applications to a live server So here we saw how Jenkins can be used for continuous integration continuous delivery and continuous deployment by integrating I’m with other tools All right Now, let’s move on to what is darker Now before we discuss about Docker, let’s compare virtualization and containerization Now the goal of virtualization and containerization is to solve the problem of the code works on my machine, but it does not work on the production Now this problem happens because somewhere along the line you might be on a different operating system Now, let’s say your machine is a Windows machine

and you’re pushing the go to a line X server now, this will usually result In error because the windows and Linux support different libraries and packages and that’s why your code works on the development server and not on the production server All right Now when it comes to virtualization, every application is run on a virtual machine now the virtual machine will basically let you import a guest operating system on top of your host operating system Now this way you can run different applications on the same machine All right Now you’re wondering what is the problem with virtualization? Now one major drawback of virtualization is that running multiple virtual machines on the same host operating system will degrade the performance of the system now this is because the guest operating system running on top of your host operating system will have its own set of Kernel and set of libraries and dependencies which take up a lot of resources like the hard disk processor and RAM and another drawback is that it takes time to boot up which is very critical when it comes to a real-time application All right Get rid of these drawbacks containerization was introduced now in containerization that is no guest operating system So instead the application will utilize the host operating system itself So basically every container is going to share the host operating system and each container will have its own application and application-specific libraries and packages All right So within a container there is going to be an application and the application specific dependencies I hope this is clear guys Now that we’ve discussed containerization Let’s see how Docker uses containerization now Docker is basically a containerization platform which runs applications within different Docker containers So over here you can see that there is a host operating system on top of which there is a Docker engine Now this Docker engine will basically run contain a number one in container Number two Now Within These two containers are different applications along with that dependencies Alright, so basically within a container The application is going to have its own dependencies installed So it does not have to bother any other container Okay So basically there is process level isolation that happens You’re all right Now there are three important terminologies to remember when it comes to Docker Now the first is the dockerfile now the dockerfile basically contains the code which defines the application dependencies and requirements All right, and through the dock of file, you’re going to produce the docker image which contains all the dependencies such as the libraries And the packages of the application next is the docker container Now every time a Docker image is executed It runs as a Docker container So basically Docker container is a runtime instance of a Docker image So now let’s look at a dock or use case now over here You can see that I’ve created a Docker file Now within the dockerfile are basically defined the dependencies of the application Now out of this Docker file or Docker image is created So basically the libraries and the packages that the application needs Installed within the docker image now every time the docker images run It runs as a Docker container Now, these Docker images are pushed into a repository known as Docker Hub Now this repository is very similar to the git repository where in you’re committing code into the git repository in this case You’re going to commit Docker images into the docker Hub repository All right Now you can either have a private or public repository depending on your requirements now after the image is published a Docker Hub the production team Or the testing team can pull the docker images on their respective servers and then build as many containers as they want All right Now this ensures that a consistent environment is used throughout the software development cycle Now, let’s look at water microservices now guys, I’m going to explain what microservices is because we need to deploy a micro service based application in our demo just to take it up a notch I’ve implemented microservices Now first Let’s look at the monolithic architecture now over here Let me explain this with a Example now on the screen you can see that there is an online shopping application which has three services customer service product service and card service Now these services are defined within the application as a single instance So when I say single instance, it means that these three servers will share the same resources and databases which make them dependent on each other Now if they share resources, obviously that dependent on each other right now, you must be wondering what’s wrong in this architecture Now, let’s say that the product service stops working because of some problem now because the services are dependent on each other the customer and the card service will also stop functioning So basically if one service goes down, the entire application is going to go down All right Now when it comes to a micro service application the structure of the application is defined in such a way that it forms a collection of smaller services or microservices and each service has

its own database and resources All right, so basically Customer Microsoft product micro service and card micro service will have their own database and their own resources and therefore they’re not going to be dependent on each other All right, so they are basically independent autonomous microservices Alright Now, let’s look at a few advantages of microservices Now, the First Advantage is independent development Now when it comes to a monolithic application developing the application takes time because each feature has to be built one after the other so in the case of the Online shopping example only after developing the customer service the product service can be started So if the customer service takes two weeks to build then you have to wait until customer service is completed and only then you can start building the product service All right, but when it comes to a micro service architecture, each service is developed independently, and so you can develop customer service card service and product service parallely, which will save up a lot of time Alright now the next Advantage is in When deployment now similar to Independent development each service in a micro service application can be deployed irrespective of whether the service before it was deployed So each service can basically deploy individually now fault isolation Now when it comes to monolithic application, if one of the services dropped working, then the entire application will shut down but when it comes to a micro service architecture, the services are isolated from each other So in case anyone service shuts down There will be no effect on any other service now The next Advantage is mixed technology stack now each micro service can be developed on different technology Now, for example, the customer service can be built on Java and the product service can be built on Python and so on Alright, so basically you’re allowed to use mixed technology to build your microservices The next is granular scaling now granular scaling means that every service within an application can be scaled independently Basically, the services are not dependent on each other They can be developed deployed at any point of time irrespective of whether the previous service has been deployed or not So guys, I hope you are clear with the advantages now over here We’re going to compare how microservices can be deployed by using virtual machines and Docker containers All right Now when it comes to a virtual machine now, let’s say that we have a micro service application which has five Services now in order to deploy these five services on a virtual machine Gene will need 5 virtual machines All right Now each virtual machine will be for one micro service now, for example, if I allocate 2 GB RAM for each virtual machine then five of these virtual machines will take up 10 GB RAM and the microservices may not even require so much of resources So we just end up wasting these resources and at the same time you’re occupying too much disk space which will degrade the system’s performance Now, let’s see how Docker containers deploy microservices So instead of running five virtual machines, we can just run five Docker containers on one virtual machine now by doing this we’re saving up a lot of resources, but when it comes to a Docker container, you don’t have to preallocate any Ram the docker container will just utilize the resources that are needed And another point to remember here is that Docker containers are light-weighted They do not require additional guest operating system instead They just share the host operating system All right, so this makes them very lightweight when compared to a virtual machine Now let’s move on to the use case now Basically, we’re going to try and understand the problem with the help of an analogy now over here You can see that in the favorable environment The soil is fertile and the tree is water at a regular basis And as a result of this the tree grows properly, but when the tree grows in an unfit environment, whether required dependencies for growing a tree are not present, then the tree will die All right now similarly when an application runs on an inconsistent environment, which is not both the application dependencies Then the application will fade All right guys Now let’s look at the problem statement with a small example Now, let’s say that it developers building an application using lamp stack Now after the application is developed it is sent for testing now this application runs properly on the testing server, but when it is deployed to production a feature or the entire application fails now this may happen because the Apache version of the lamp stack is outdated on the production server so due to the Difference in the software versions on the production and development server the application fails now in order to get rid of the inconsistent environment problem We’re going to deploy an application using Docker now Docker will make sure that the environment throughout the development cycle is consistent now deploying a monolithic application can cause many problems like for example, if one other feature of the application stops working, then the entire application will shut down

So for this reason we are going to create a micro service based application And build it on the Jenkins server and finally use Docker to maintain a consistent environment throughout the cycle So over here you can see that there are four micro services and for each microservices I’ve built a Docker file All right So first let me discuss what each of these microservices do now the account service and the customer service are the main microservices but as the discovery and Gateway services are supporting microservices now account service will basically hold the account details of a customer and similarly the customer service will have a list of Customer details now Discovery service, which is the supporting service will hold details of the services that are running on the application and apart from that It will also register every service in the application Now what a Gateway service does is on receiving a client request It will route the client requests to the destination service now to be more specific it will provide the IP address of the destination service Okay So now that you know how these microservices work Let’s move on to the next part now basically A sickly these micro services are coded and that dependencies are put into a Docker file Now for each of these doc of files or Docker images created by packing the docker image with a jar files Now, how do you create a jar file? A jar file is created by running the ambient clean install command, which basically cleans up anything that was created by the previous Bill and it will run the pom.xml file which will download the needed dependencies So whatever dependencies are needed are stored in this jar file All right Now once the dockerfile is packaged with the jar file then a darker image is created for each of these micro services So here we are going to use Jenkins to automate all of these processes So Jenkins is basically automatically going to build and then push these Docker images to Docker Hub Now after the images are pushed to dock a ham the quality assurance or the production team can pull these images and build as many containers are to fit All right So basically over here we’re going to create Docker files for each of these These micro services and then we’re going to package these doc of files along with the jar files and create a Docker image for each of these micro Services All right Now after creating the docker images, we’re going to push these images to Docker Hub after which the quality assurance or a production team will pull these Docker images onto their respective servers and build as many containers as they want I hope this is clear So now let’s practically Implement all of this Alright guys, so I’ve logged into Jenkins and I’ve created for different jobs each for one micro service All right Now, let me just show you the configuration of one of these jobs Now, let’s go to account service Let’s go to configure So guys make sure that you enter your GitHub repository here So go to source code management click on get and then enter your repository URL over here Now, let me just show you what we’re doing here Now within the build step I’ve selected execute shell now Let me just show you how that’s done So it’s simple just go to add build step and click on execute shell So when you click on execute shell or command prompt will open like this and you can type this code on that Now what I am doing here is first I’m changing the directory to account services because I’m running the account service within this job after that I’m performing an MBA and clean install which I explained earlier now once we’re done with that we’re going to build a Docker image and then we’re going to push it to your Docker Hub account Now, these are the credentials to my Docker Hub account Where’s the Lakers? Are you? Name of my Docker Hub account and enter a car – demo is a repository that I’ve created in my Docker Hub account and click on apply and save our bathroom account services are built Jaws for the other services as well Now Let me just show you customer service Also Let’s go to configure now within the source code management Like I said earlier enter your repository URL after that go to the build steps over here You can see that I’m changing the directory to customer service then I’ll perform MBA Clean installed So next I’m going to build Docker images now over here customers basically the tag of the image So whenever this image is going to get pushed to my doctor harm the tag is going to be customer All right, now similarly for account service the tag was account Now, I’ve done the same thing for all the other jobs All right, click on apply and save now guys in order to run these for jobs as one workflow I’ve created a build pipeline Now this pipeline will basically execute these four Jobs in one workflow Now, if you want to know how to create a build pipeline, please refer the video in my description box I’m going to leave a link where you can see how to create a build pipeline All right Now, let me just show you my GitHub account now over here, you can see that I have account service customer service Discovery service Gateway service And also there’s Zipkin service now guys, this service basically keeps a track of all the other services So it’s going to keep a track of where the requests are going

and how the Are getting sent from account service through customer service now with an account service You can see that I have a dock of Carl Jenkins file and a Bomb Dot XML file All right guys, now let’s start building an application Just click on the run now here you can see that account service is getting executed Now, let’s individually go to account service first Let’s click on account service All right here you can see that it’s building this job So basically here what we’re going to do is we’re going to change the directory to account service After that, we’re going to perform an MBA and clean install and then we’re going to build an image and push that image to Docker Hub All right, so guys remember to provide your Docker Hub credentials Now this job has successfully executed now after the job has executed is going to trigger the next job, which is customer service Now, let’s look at the build pipeline now over here This is turned green because account services completed execution now customer service is currently running so Let’s look at the build in customer service So after the gun service is completed execution Where’s you can also check the output of account service from here scroll down and says success now after Gonzales has finished Let’s trigger the customer service So customer service starts executing now now let’s individually look at customer service now over here, you can see that customer services building now in this job You’re basically going to change the directory to customer service after that We’re going to perform an MV and clean and Tall command and then we’re going to build and push a Docker image to Docker Hub All right So once this is completed the next job in the pipeline will get executed Okay? Alright guys, so this is successfully executed Now, you can see that customer service is also turned green, which means that it has successfully finished building Alright Alright guys, so you can see that customer service is completed execution Now, let’s trigger the build of Discovery service Now, let’s look at the output of Discovery service So guys, you can see the output from here itself Let’s click on console All right So within the discovery service again, we’re going to change the directory to Discovery service after that We’re going to perform an MBA and clean install and once we’re done with that we’re going to build an image and then we’re going to push it to Docker Hub guys Make sure you have entered your dog or have credentials Alright guys So this is completed execution You can see that it says success now, it’s triggering the new bill, which is Gateway service So here you can see that Gateway Services started execution Let’s look at the console output All right, so similarly in Gateway Service First you’re going to change the directory to Gateway service after that you’re going to perform an MV and clean install command and once you’re done with that you’re going to build an image and then push it to Docker hub So guys Gateway service and successfully completed execution Now the bill pipeline has fully turn green, which means that the entire workflow has completed execution Now, let’s go to our Docker Hub account and see if all these images got pushed to Docker Hub All right, so I’m going to my doctor harm now Let’s go to the editor a car demo Repository Now over here, you can see that the account customer Discovery and Gateway Services all of these four images of push to Docker Hub All right So with this we have come to the end of the demo now after pushing these images to Dhaka harm any quality assurance team or any testing team can pull these images onto their respective servers so they can easily deploy this to production Docker and node.js tutorial so why use node.js with Docker? So as it speeds up the application deployment process deployment becomes easier that the lot of things which you don’t need to look at while deploying if it runs locally on your Docker container surely it will run on any other machine or any other server on any Docker container application portability increases you’re developing on Windows deploying on On a Linux you don’t need to care about all that if it works in one container it’ll work in another container simplifies the Version Control process promotes componentry use very light footprint and puts less overhead on the app Now, let’s start with a simple node app I’ll do npm in it I create an empty project So we have a empty package dot

Json file will go ahead and install Express So we’ll try to create a very simple hello world application using Express So it will be a web application Express is a very popular web framework created on node So you’ve now if we Open the package dot diesel we can see that the name of the application and mainly in the dependencies We have expressed listed over here Okay, we’ll create our app dot J’s file That will be our app Let’s write our application over here First we’ll import the express module We’ll use that object of the express module to create our app object We’ll use the app object to listen for this is where we actually starting our HTTP server and as to listen on a particular port We can use any port number over here 3000 the port numbers are a commonly used are three thousand eighty eighty or eighty eight eight four times Basically any number any port that is open on your system And finally we’ll just create one route where the app would be giving a responsive that route is hit in the browser We’ll just send Hello from Docker Okay, I think that’s all we need is a simple demo will try and run this Okay, I’m listening on 3,000 blue errors will open this Okay Hello from Dhaka We have it great So I’ll close this now now let’s talk our eyes this application So as you remember the three basics of Docker dockerfile Docker image Docker container We need a Docker file over here Destroyed dockerfile, no need to give any extension Okay still text file will open this Not this is where we will tell doc of what to do before moving on with the commands This is the docker Hub website Hub dr.com I suggest you please create account on this website, or I guess when you go to install when you go to download the docker, I think it will tell you to create an account or Docker ID So once you have an account on half doctor.com you go to explore and this is where you see all the popular images of talker So anytime you’re working with any language platform For example, let’s say notice in our case or PHP or dotnet or using a database is let’s say like over here post cry or couchbase all these standard Technologies They have their own official Docker images already on the docker Hub You don’t need to create images for these from scratch because these are all readily available to use So in our case right now, we need to use the node on the docker So you just search for node Okay, and yes, you can see we have node is an official image of official image means this particular Docker image is created by the people who create a node Okay, like Mongo Express So this Docker image is created by the people who actually create the Mongo Express Library Okay, and then obviously there are verified Publishers, like for example, Microsoft and anybody can upload a Docker image over here in the hub Okay, and you can also filter Them by the categories the kind of image that you want the supported OS supported architectures, etc Etc So for us all we need is this node Docker image? So this is the image upon which our image will be built and the container would be working Okay, so coming down how to use this image Okay So you need to go to this guide will open the setup page of node Okay So over here create a Docker file in your node.js app project specify the know Road base image with your desired version This will be the first line of our dockerfile So this is the official Docker image that we want to use and this is the version of that Docker image not the version of node You can have a look at all the supported Docker image versions of node I think 10 is good for us I think it is the latest one We don’t actually need to go and dig into which version supports what but this is good for us for now Okay, moving forward now What do we want to tell Docker to do? First we’ll create a working directory for the docket So this is where we are telling Docker to like create a app directory for itself where whatever work or things

The doctor needs to do for our application doctor can put it inside the app folder Will tell Docker to copy our package dot Json and if you remember dockerfile is inside our app folder Okay So this is inside our app folder So we don’t need to give any paths for any files that you are referencing so I can directly say copy package.json inside the app Okay run npm install So this is like very easily understandable commands copy package dot Json inside the app folder and then run the npm install So this command will be Inside this folder of the docker container and what npm install would do is whatever packages are listed inside package dot Json if you remember we have expressed so those packages will be installed Okay, then we tell Docker to now dot over here means the current directory the file isn’t so this is our current directory and metering Docker to copy everything from the current directory to the app folder and then run the command node So this is the command which even we used to run the node app Okay So this is what Taco would run inside its container and lastly if you remember we had a port number which we were using for us It’s 3,000 So we need to expose a Number as well, okay Yeah, so I think this is it we are done now We’ll try and run this inside Docker Okay So first we need to build the docker image We only have a dark of file right now So next step is to build a Docker image from the dockerfile We need to give a name to the docker image I’ll name it Hello Docker Okay, because the mistake that I did is to put a dot in the end So just in the current directory we are in okay So as you can see, these are the commands that is running one by one It’s going through all the steps from Note 10 What dir copy back as dot Json run npm install and this over here It might take a while because it needs some time to download the packages listed in package dot Json Okay, and then it went through everything fine Okay Now we have the image created now, we need to run the docker app So the Almond for that is Docker run Also again, we do have the docker documentation online, which you can refer any time Okay, so any language any platform technology, you learn always try and refer to the official documentation, if you can like refer from it study from it That is the best always another thing even in the terminal in the console You know, you can always look at help it will list out all the options that you can give to the command So these are the options for the Run command not the docker command the Run command Okay all the options for the the docker command would be darker help Okay So these are all the sub commands and options that you can use with Docker So moving on we’re going to run the image occur run now, it means we want the docker to run in an interactive shell So if you look at the options, that’s not required, but it’s good Okay, so – i – I interactive keeps standard input open even if not – And T allocate a pseudo TTY TTY means or terminal so Docker run And we want to tell Docker which Port we exposing and which Port via using inside the application So again, if you look at help, there is this P option publish lists publish a container sport to the host So we’ll be creating a Docker container, which is running on the host host is over Windows operating system We need to tell which Port the docker is exposing and which Port is being used by the app inside this port 3000 over here and this mm Oh why Will be different Okay, it’s not compulsory that there should be the same all the time We can have 8,000 over here 3000 over here And all we need to do is map it in the command But over here is the same so Docker run So the it what basically would do is I’ll show you when the command runs So this first 3000 is the port number of we listed in the dockerfile the port exposed by doctor And the second one is what our app is using Okay now our image name was hello Soccer let’s run this Okay We have some error it says it’s already allocated

Okay, we’ll try another put this may be due to because I was already doing some tests and running this now once I have changed the dockerfile, I need to rebuild my image will run the build command again Okay Now I will run the image Docker run interactive’s 888 and 3000 inside the application Hello talker And we have running now Let’s try and run again Okay, the site can’t be reached now if you remember we have this talker toolbox thing open and it has its own machine IP hundred 192.168 attend and hundred port number 3000 Okay, so I’m sorry, but I had another instance running already on that Port that is why it did not allow me to run that Docker image on that particular Port I changed my dockerfile port to double it double it and that is the one that is being exposed So for us over here the port number should be double a double date and that is where I see the message Hello from darker, which is what actually we have used Hello from Docker The reason why 3000 is working is because there’s always The another Docker instance running in the background, which I hadn’t closed and it says hello world So there’s actually another Docker container already running on that port and that is why it did not allow me to run the docker container on this port So as you can see I already had one running which I forgot about sorry about that So our app is running right now on the port double it double it and that is the port exposed by talker to my operating system, which is Windows, but the Port on which the app is running inside the docker container is 3,000 So the app is still running on three thousand but Docker is exposing our app to put double it double it and that is what we have mapped over here and – – IIT means it’s interactive right now this message what you’re seeing is actually from a console inside the docker container This is not from our own CMD or command line Okay So now I can press control C to end this Okay Yeah, so as you can see it has ended Okay, so I was able to give it the command to end it and that came and went to the console of the container So I hope you enjoyed it the small demo Okay And yeah, this is what we actually did basically create the know Jesus I have created dockerfile build the image and then execute it Let’s look into the topics for today’s session So we’ll start today’s session by understanding What is a virtual machine and then I’ll tell you the benefits of virtual machine after understanding that I’ll tell you what our talk of containers and then I’ll tell you the benefits of Docker containers after an introduction of virtual machine and talk of containers I’ll tell you the difference between Docker containers and virtual machine and then the uses of them So now let’s get started with the first topic for today’s session that is what is virtual machine a word Your machine is an emulation of a computer system in simple terms It makes it possible to run what appears to be on many separate computers on Hardware that is actually one computer the operating systems and their applications share Hardware resources from a single host server or from a pool of host servers Each virtual machine requires, its own underlying operating system And then the hardware is virtualized not only this but a hypervisor or a virtual machine monitor is a software We’re firmware or a hardware that creates and runs virtual machines It sits between the hardware and the virtual machine and is necessary to virtualize the server since the Advent of affordable virtualization technology It departments have embraced virtual machines as the way to lower costs and increase efficiencies now with the note of this let me tell you the benefits of virtual machines So the benefits of virtual machines are mainly all the operating system resources Sis are available to all the applications They have established management and security tools and not only this but they’re better known for security controls Now who are the popular virtual machine providers while the popular virtual machine providers are VMware K VM virtualbox Zen and hyper-v So now that you’ve understood what is the virtual machine? Let me tell you what Docker containers are

So as we all know that Docker is the company driving the container movement and the only container platform provider to edges every application across the hybrid cloud with containers instead of virtualizing the underlying computer like a virtual machine only the operating system is virtualized container sit on the top of a physical server and each container shares the host operating system kernel and usually the binaries and libraries to now sharing the operating system resources Just libraries significantly reduces the need to reproduce the operating system code and means that the server can run multiple workloads with a single operating system installation containers are thus exceptionally light and they’re only megabytes in size and they just take few seconds to start in contrast with that virtual machines Take minutes to run and are an order of magnitude larger than the equivalent container all that The container requires is enough of an operating system Ting programs in libraries and a system resource to run a specific program what this means is that in practice You can put two to three as many as applications on a single server with containers that you can with a virtual machine in addition to this with containers You can create a portable consistent operating environments for development testing and deployment So now that I’ve told you about containers, let me tell you the Types of containers so mainly there are two different types of containers that is the Linux container and the docker containers So the Linux container is a Linux operating system-level virtualization method for running multiple isolated Linux systems on a single host Whereas darker started as a project to build single application Linux containers introducing several changes to the Linux containers that make containers more portable and flexible to use at a high level We can say that Soccer is a Linux utility that can efficiently create ship and run containers So now that I’ve told you the different types of containers, let me tell you the benefits of containers So containers offer reduced it management resources They reduce the size of the snapshots They’re used in quicker spinning of apps and they also make sure that the security updates are reduced and simplified and they also make sure that there is less code to transfer migrate and upload workloads Now who are the popular container providers? Well, the popular container providers are the lyrics containers to talk and Windows server So now that I’ve told you individually what a container is what a virtual machine is and how do these two work now? Let me show you the major differences between Docker containers and virtual machines Well, the major difference is come with operating support security portability and performance So let’s discuss each one of these terms one by one and let’s know the differences between both of them So let’s start with the operating system Support the basic architecture of Docker containers and virtual machines differ in their operating system supports containers are hosted in a single physical server with the host operating system, which is shared among them But the virtual machines on the other hand have a host operating system and an individual guest operating system inside each virtual machine irrespective of the host operating system The guest operating system can be anything like it can be Linux windows or any other our operating system Now the docker containers are suited for situations where you want to run multiple applications over a single operating system kernel, but if you have applications or servers that need to run on different operating system flavors, then virtual machines are required sharing the host operating system between the containers make them very light and helps them to boot up in just a few seconds Hence the overhead to manage the container system is very low compared to that of Virtual machines now, let’s move on to the second difference that is Security in Docker since the hose kernel is shared among the containers the container technology has access to the kernel subsystems as a result of which a single vulnerable application can hack the entire host server providing root access to the applications and running them with a Superuser privileges is therefore not recommended in Docker containers because of these security issues on the other hand And virtual machines are unique instances with their own kernel and security features They can therefore run applications that need more privileged and security Now moving on to the third difference that is portability Docker containers are self-contained packages that can run the required application

since they do not have a separate guest operating system They can be easily ported across different platforms The containers can be started and stopped in a matter of few seconds compared That of vm’s due to the lightweight architecture This makes it easy to deploy Docker containers quickly in servers on the other hand virtual machines are isolated server instances with their own operating system They cannot be ported across multiple platforms without incurring compatibility issues for development purposes where the applications have to be developed and tested in different platforms Docker containers are the ideal choice now, let’s move on to the Final difference that is performance darker and virtual machines are intended for different purposes So it’s not fair to measure the performance equally but the lightweight architecture makes Docker containers less resource-intensive than the virtual machines as a result of which containers can start up very fast compared to that of virtual machines and also the resource usage varies among the two in containers the resource usage such as CPU memory input output varies With the load of traffic in it unlike the case of watching machines There is no need to allocate resources permanently two containers scaling up and duplicating The containers is also an easy task compared to that of virtual machines as there is no need to install an operating system in them So now that I’ve told you the differences between Docker containers and virtual machines, let me show you a real life case study of how Docker containers And virtual machines can complement each other So all of us know PayPal, right? So PayPal provides online Payment Solutions through their account balances bank accounts credit cards or promotional financing without sharing the financial information today PayPal is leveraging openstack for the private clouds and run smoother than 1 lakh virtual machines Now, one of the biggest desire of PayPal’s business was to modernize their data center infrastructures making it more on demand Improving its security meeting compliance regulations and also making everything cost efficient So they wanted to refactor the existing Java and C++ Legacy applications by doc Rising them and deploying them as containers this called for a technology that provides a distributed application deployment architecture and can manage workloads But must also be deployed in both private and public Cloud environments So PayPal uses talk a commercial solution Solutions to enable them to not only provide gains for the developers in terms of productivity and Agility but also for the infrastructure teams in the form of cost efficiency and enterprise-grade security The tools being used in production today include talk of commercially supported engines Docker trusted registry and as well as talk a compose the company believes that containers and virtual machines can co-exist and thus they combined these two technologies leveraging Docker containers and Two machines together gave PayPal the ability to run more applications while reducing the number of total virtual machines and also optimizing their infrastructure this also allowed PayPal to spin up new applications much more quickly and also on an as-needed basis since containers are more lightweight and instantiate in a fraction of second while virtual machines take minutes They can roll out a new application instance quickly patch up an existing application Ian or even as the capacity to compensate for peak times within the year, so this helped PayPal to drive Innovation and also outpaced the computations So guys, that’s how the company gained the ability to scale quickly and deploy faster with the help of Docker containers and virtual machines So now let me summarize the complete session in a minute for you So Docker is a containerization app that isolates applications at the software level if a virtual This a house the docker container is a hotel room If you do not like the setup, then you can always change the hotel room as it is much easier than changing a house, isn’t it? So similarly as a hotel has multiple rooms sharing the same underlying infrastructure doctor offers the ability to run multiple applications with the same host operating system and sharing underlying resources now, it is often observed that some of them believe that Docker is better than a virtual Machine, but we need to understand that while having a lot of functionality and being more efficient in running applications Docker cannot replace virtual machines, both containers and virtual machines have their own benefits and drawbacks and the ultimate decision will depend on your specific needs

But let me also tell you that the some general rules of thumb that is what your machines are a better choice for running applications that require all of the operating system resources and functionalities Well, you need to run multiple applications on servers or have a wide variety of operating systems to manage Whereas the containers are a better choice when your biggest priority is to maximize the number of applications running on a minimal number of servers But in many situations the ideal setup is to likely include both with the current state of virtualization technology, the flexibility of virtual machines and the minimal resource requirements of containers work together to provide Environmental Moments with the maximum functionality These will be the parameters I’ll be comparing these two tools against insulation cluster configuration GUI scalability auto-scaling load balancing updates and rollbacks data volumes and finally logging and monitoring Okay Now before I get started with the difference, let me just go back a little bit and give you a brief about communities and Doc is warm Okay now first of all, At ease and Dockers warm are both container orchestration tools orchestration is basically needed when you have multiple containers in production and you will have to manage each of these containers and that’s why you need these tools Okay, Cuban eighties was first of all created by Google Okay, and then they donated the whole project to the cloud native Computing foundation And yeah now it’s a part of the CN CF open source project Okay, and since communities was Google’s brainchild It has a huge developer community and a lot of people who are contributing Two communities So if you have any errors at any point of time when you’re working with kubernetes, then you can straight away put that error on github.com or stackoverflow and you will definitely have solutions to those errors So that’s the thing about communities and we consider Cuban at ease to be more preferable for a complex architecture because that’s when the whole power of Cuban and is comes out So communities is really strong Okay, if you’re going to use a very simple architecture may be an application which has very few services and which needs very few containers Then you’re not going to really see the power of Been at ease when you have like hundreds of thousands of containers and Broad that’s when kubernetes is actually beneficial and that’s why you see the difference between Cuban IDs and Dockers Wang, right? So Doc is form on the other hand is not that good when you have to deal with hundreds of containers Okay, so functionality wise they are pretty much head-to-head with each other Okay So with both you can set up your cluster, but yeah, dr Swarm is little easier and it’s more preferable when you have less number of containers Okay, but whatever it is if you are dealing with fraud environment Then Cuban at ease is your solution because Cuban artists will ensure your classes strength in prod a little more at least when you compare it to dock a swamp Okay, and yeah the doctors from Community is unfortunately not as big as the communities because Google is basically bigger than darker and darker swarm is again owned by and Marion by darker ink, so that is the deal with kubernetes and doctors from all right, but never mind the fact that the base continues which are used for these are again Docker containers So at the end of the day Docker is definitely going to be a part of communities and as part of dr It’s just what you do after your containers That’s what matters the container management part Okay So anyway, I have given you a good brief about these two tools Okay Now, let’s get down to the functional differences between these two Let’s start with insulation and cluster configuration now for setting up your cluster with kubernetes is going to be really challenging in the beginning because you will have to set up multiple things You have to first bring up your to Cluster Then you have to set up the storage volume for your cluster and then you have to set up your environment and then you have to bring up Up your dashboard You have to bring up your Port Network And when you bring up your dashboard, you have to do the cluster role binding and all these things Okay, and then finally you can get your node to join your cluster Okay, but with Docker swamp, it’s pretty simple and straightforward You need to run one command to bring up the cluster and one command add the node end for it to join the cluster and to simple commands and your classes running You can straight away get started with deploying Okay So this is where kubernetes fall short It’s a little more complicated, but it’s worth the effort because the classes And that you get with kubernetes is way more stronger than doctors warm Okay, so when it comes to failure mechanisms and to Recovery in such places kubernetes is little faster And in fact Humanities will give you more security compared to Dhaka swarm because because your containers are more likely to fail with swamp Dynamic Cuban at ease so it’s not like I’m saying that your containers will definitely fail but if at all they feel then there are more chances of your continuous feeling at swamp than with Cuban at ease Okay, so that’s about the cluster strength and If you are really important about your product moment, and if you have a business, which is basically running over these containers, then I would say your preference should be Cuban at ease because at the end of the day business and your continuous running in prod are more important, so the plaster is more important and that’s why Cuban at he’s now moving on to the next parameter We have GUI now Humanities wins over here also

because Humanity’s provides a dashboard over which we can basically controller cluster not just control we can also figure out and get know What is the status of your Start and how many pods are running in your class? Stop? How many deployments are there? How many containers are running how many services are running and which are your nodes you will have all these details in a very simple fashion Okay, so it’s not like you don’t get all these things with doctors form Okay, you get it with dr Swann also, but you don’t have a gy over here There’s one dashboard where you can visually see everything so you can use the CLI with Docker swamp and you can use the CLI with kubernetes also, but it’s just that communities provide you a dashboard which is a little better and to our eyes It’s a little More easier to understand when you see graphs when you see your deployments would say you’re all your diplomas a hundred percent healthy when you see something like that You will relate to it a lot more and you will like it a lot more so that this additional functionality which you get with kubernetes Okay, so that’s where humanity is wins over here And I also want to add another point that with your kubernetes dashboard You can easily scale up your containers and you can also control your deployments and make new deployments in a very simple fashion So even non-technical people can use kubernetes, okay? But I mean if you are a non technical person then what are you doing with containers? Right? So that’s what veterans would say So season developers would say that I mean if you’re not technical enough to deal with containers, then you don’t deserve to be here So that is one point which can defend orcas warm but it does not change the fact that Cuba Nattie is makes our life easier now moving on to the third one, which is scalability both communities and Dockers warm are very good for scaling up Okay So that is the whole point of these tools So when we see orchestration, this is the biggest benefit Okay communities can scale up very fast Just swarm can also scale up very fast, but there’s a saying that swarm is five times faster than Humanities when it comes to scaling up That is the point So I think swarm this nut just communities over here to Victory, right? But yeah, whatever it is It’s scaling up That’s what matters since both can do it Well and good So the next point is auto-scaling now if I was a Salesman then I would use this whole point of Auto scaling as my sales pitch because Auto scaling is all about intelligence right with Cuban at ease Your communities will always be analyzing your service Eric and whenever there’s a certain increase in your traffic, your communities will automatically scale up your number of containers Okay, and then when the traffic reduces then automatically or number of containers will also be scaled down Okay, so there’s no manual intervention whatsoever I don’t need to barge in So if there’s a weekend coming up and if I’m pretty sure that my website is going to get a lot of traffic over the weekend over the Saturday and Sunday, then I don’t have to manually configure my deployments for the weekend Humanities will automatically do that for me and with DACA swarm That is a major drawback because you cannot do auto-scaling you will have to do it manually Okay, you can do scaling It’s not that scaling is a big deal but during emergency situations It’s really important Okay, communities will automatically analyze that okay, you’re getting a lot of traffic today and it will automatically scale it up for you Okay, but swamp is a little different and if there’s an emergency and if your containers are running out of the number of services, which they can request then they cannot do anything I mean worst case scenario, they will just die out Okay So this is a Cuban at ease winds during these emergency situations because auto-scaling is not possible with talk us warm now moving on to my next point which is load balancing Okay Now with Cuban at ease at times you will have to manually configure these load balancing options Okay with Docker swarm You don’t need to do that because it’s automatically done Now The reason you should do it with Cuban at ease is because in communities you will have multiple nodes and inside each node You will have multiple pods right and inside these pods You will have many containers Now if your service is basically spanning over multiple containers running in different parts, then there’s this concept of load balancing which you have to manually configure because pods can let all the containers inside them to talk to each other Okay, but when it comes to managing your load between these pods, that’s where the challenge comes especially when these pods are on different nodes Okay So you will face times when you will have to manually configure these load balancing and you will have small issues Okay, but it’s not that it’s going to be a major you can still deal with it but swamp wizard because you have no The phones over here You have a swarm cluster in which there are containers So these containers can be easily discovered by others Okay, so they use IP addresses and they can easily just discover each other and you’re all good So that’s the point and now coming to the sixth point which is ruining updates and rollbacks Let’s say that these two are very important aspects and these are some of the best features of these two tools Okay Now rolling updates is basically needed for any application now, we’re a software application which is using Cuban at ease Or not whether it’s using Docker swarm or not any application needs updates Okay So rolling updates is really important because any application would need to have updates to it Right any software application any web application It definitely needs updates to its functionality Okay Now if your application is basically containerized then at any point of time,

you don’t need to bring down your containers and then make the updates with the help of using these containers the different containers and these parts can be progressively given the updates Okay, so Cuban at ease We have the concept of PODS and inside the pods We have multiple containers, right? So in Cuban at is what happens is these rolling updates are gradually sent to each of these pods as a whole So all the containers inside the pods will be gradually given these rolling updates Okay with Docker swarm You have the same thing, but it’s a little different because you don’t have pods the rolling updates are gradually sent to all the containers one after the other That’s the only difference Okay rolling updates are gradually sent to different containers and communities and in Dhaka swamp But in Cuba nattie’s it’s to all the containers within the same pod Okay, ruining updates sent one after the other to the different containers in the same pot That’s the point and when it comes to rollbacks again both provide the same thing Okay, you can roll back your changes So if your master at any point of Time figures out that you’re rolling up it is going to fail then you have an option of rollback You actually have the functionality in both communities and andhakas form But the point is there’s no automatic roll back in case of your kubernetes cluster of your master Turns out that the update is going to fail then it will automatically roll back to the previously stable condition But with swamp the Swarm manager will not automatically do it I mean it provides optionality to roll back but it’s not automatic That is the only difference between these two So I think over here also communities slightly beats doctors warm Okay just nudges ahead of it And now coming to the seventh point which is nothing but data volumes now data volumes is a very key concept because you can have a shared volume space for different containers, okay The conceptual difference between these two is that in Cuba Nettie’s you have multiple ports and only containers inside that one particular pod can have a shared volume Okay, and the difference with Q Docker swarm is that since there are no pods pretty much any container can share the shared space with other containers So that is the only difference Okay, so I don’t think I would go ahead and rate these two It’s just a functionality and a conceptual difference between these two tools Okay now moving on to the last Point logging and monitoring so with kubernetes you have Built tools which does the logging for you and also the monitoring happens Okay So there is a particular directory where you can go and you can read your logs and you can find out where your errors are what your deployment failed why something happened you can get all those details because it automatically does the logging and the monitoring part is used by your master to basically analyze what’s your cluster state is at all the time What is the status of all your notes? What is the status of the different pods in the nodes are all the containers up and running our continuous responsive So communities uses monitoring for All these purposes, okay, but with DACA swarm, there is no inbuilt tool and you have to use third-party tools something like an e LK, right? So I’ve done that before and I’ve set up a LK to work with my doctors mom and it pretty much does the same thing Okay So with L kill, you can correct all the logs you can figure out where the error is and even monitoring can be done But it’s just that L key is again not a very easy tool to set up and use that extra step which you have to do with the respect to dr Swarm Okay, so I think that’s pretty much the end of the function Novelties and the concept of differences between these two tools communities and dr Swann now that is the end of the theory part over here I want to open up for DACA swamp and communities and show you a demonstration and give you a feel as to how they work Okay So for that, let me open up my VMS where these two are installed Let me start the demo with Docker swarm first So can everybody see my VM over here So I have what two virtual machines I have a master and I have a slave but when it comes to Dockers warm, they’re not called master and slave but they are rather called manager and woke up So my manager is the manager of the cluster and my worker would be the one that would be executing the services All right So like I said with your doctor swarm, it’s very easy to bring up the cluster and the command to do that is very simple You can just specify Docker swarm in it advertised adder and just specify the IP address of your master Okay, so in my case my master or my man I’d be addresses this one Okay So if I just hit enter then everything is up and ready I get the joining token And if I just execute this command at my node and then my cluster would be ready and I would be joining my cluster Okay, so I’m going to copy this Let me go to my worker and here let me paste this if I hit enter then it says that this node has joined the Swarm as of worker brilliant, right? So that’s as quick as it is and with your master you got this message saying to add a manager to the Swarm you should Use this other command Okay, but that’s only if you want another node to join as a master or as a manager, but otherwise this command is good enough So your cluster has been initialized and in just a few seconds, right? So it’s as simple as that if you want to deploy an application, you can go ahead and straight away do that Let me show you a simple application

Let me run a hello world and show you I can use the command Docker service create and let me give the name as Hello world Okay, and the image to be used as the hello world image? Okay, so I will basically get a container having the name of hello world and that would be created and it could be both it could be running in both the manager and on my node, but if I want one replica of that running in both my manager and my node, then I can set then there’s another flag I can use to set that Okay, and that is the mode flag I can say mode is equal to Cool So with this I will have one container running on my manager end and one continue in my node And this is where the differences with respect to Cuba Nettie’s because in Cuba not he’s only your nodes will run the services your manager or your master will not execute any service Okay, it’ll only manage the whole deployment Okay, so that was a spelling mistake in my command So let me just go here and say service Okay So let’s just wait for a few seconds until my container is up and running great So as you can see my service has been created and this is my ID if I want to verify my cluster State and to check if my services are ready I can run these commands I can do a Docker node PS Okay in this way, I’ll know how many continuous came up and on which nodes they were executed So it says on my manager there were four of these that started Okay, and of course it’s a hello world containers So it’s basically shut down immediately And I can do a Docker know Del s to identify how many members are there in my cluster? So with this you can see that there are ideas for two different nodes one is my worker and the other is my manager, right? And that’s how simple it is with Docker, but with kubernetes it’s a little more different Okay, so I think by now you got a good idea of how simple Dockers warmest Okay, and besides I can also check the service status by running a few commands, right? So I have a docker As service lso this would basically list down the containers which are there and the services Okay So it says I have a Hello World container which is running and it’s in replicated mode and there is one replica of this particular container, right so I can also check more I can do a Docker service PS and I can say the name I can say hello world and I have videos about my container Right? So initially there was one container with start off in my worker and then it got shut down and then one more on my And then a couple of them on my manager So these are the details and this is how you drill down Right? So you specify that I need one particular service That is the Hello World Service and I need this many replicas wherein I want them running on my manager and my Walker and then the container has been deployed and it’s running and that’s what you can see here Right? So that is about Docker swamp and let me bring the VM down and bring up my communities bm’s to show you a demonstration of Cuban at ease Okay Well, I hope the concept was clear you but in case if you have any doubt, then I would request you to go to enter a girl’s YouTube channel and watch my video on Docker swarm where I’ve shown load balancing between the different nodes and I’ve also shown how to ensure High availability Okay So in the meanwhile, let me just shut this down to bring down the cluster I can basically get my notes to leave the cluster first and then shut down the classroom itself So if I want to bring down my cluster, I can do it with a simple command But before I do that, let me stop the service That created Okay So Docker service RM and hello world was a name So I want to stop the service and now there are not going to be any replicas of this service or this container Okay Now, let me go back to my node And here let me leave the cluster the Swarm cluster Okay, and the simple command for that is darker swarm leave So if I hit the command at the node and then this node will leave the swamp Okay So if I run the docker node LS command over here then the entry you for my note will be gone It would have only one entry that is my manager Okay, but anyways, if I want to bring the password to an end, then I can get you in my manager to leave the cluster and I can execute the same command for that I can say Swarm leave and everything is back So yeah, let me use Force Okay, no one has left So that’s a bit darker swarm Okay Let me just close this terminal and go to my next demo So now let me open up my VMS which have the kubernetes running Okay So this is my community’s master and this is my Cuban at ease node Okay Now the thing is that I’m not showing you the entire set up over here because it’s really complicated All right, so I don’t want to go ahead and execute all the 1015 commands and show you the entire process set up because it’s going to take a lot of time to do that rather If you want to know

how to do the cluster set up with kubernetes, then you can go and see the blog which I have written And also there’s another video on how to setup the kubernetes cluster All right So these two would do you of any help the YouTube video and the blog and the link to both of them are below in the description Okay So, let me just straight away get started and tell you what I have already done if I have one Set up the cluster Then there are a lot of things which I should have done Okay starting from here So basically I have started my inner command over here I’ve specified which Port Network I’m using I’m going to use a Calico Port networks of specified that and specify the address where the other nodes are to subscribe Okay, and then there are various commands which after run with respect to setting up the environment Okay these and then I basically set up the calcio Padova here and then I have made room for setting up the dashboard and then I brought my proxy up, okay Okay, and then from the second terminal I’ve done few more things I have brought up my dashboard account So I have created a service account for my dashboard And then I have done the cluster old binding by saying that this dashboard that I am the admin and give me the admin privileges So I’ve done that here and then basically obtained the key which is basically the authentication key for accessing the dashboard So these are the so many other commands which are needed to be executed from the Masters end before your no joints And then after that I basically went to my node And then I executed the one command which I was asked to execute Okay So this was the joint command a generated at my master So I took that and I paste it here and then my node successfully has joined the cluster So this was the entire process and you can go to my blog and to my videos and go through this whole process Okay, so I have also brought up the dashboard, right? So let me just straight away go to the dashboard and show you how simple it is how easy it is to make any deployment because that is the whole advantage With your dashboard right doctor for may be easier That’s what I showed you with communities It’s much more better And this is the communities dashboard that comes up it comes up on this port number All right, and if you want to start your deployment, it’s very very simple Okay, you can just go to this create button over here click on Create and then you have option You can either write your Json script or you can upload the Json file, which I have already written or you can click on this create an app over here It’s basically a click functionality and here you can just put Your app name So let’s say I want to deploy the same Hello World app So I’ll just put the hello I will give the name over here hello world and then the basement which I want to use for this is going to be the hello world image is going to be present in my Docker Hub registry or the Google Registry So hello world is the image and let’s say I want three pause initially Okay and let me just straight away Click deploy Okay, and with that your application is deployed and similarly if there’s anything else you want a containerized It’s a simple if it’s going to be Nanjing server or a tomcat or an Apache server, which you want to deploy you can just choose the base image and hit on the deploy button and yes, it’s straight away deployed and you’ll get something like this which would show what is the overview and what is the status of your cluster? Okay, as you can see my deployments mypods and replica sets Everything is healthy a hundred percent, right? So this is my deployments So it says that two out of three pods are running So let’s just give it a few minutes and then all the three pods will be up and running Okay, you got to give it a few seconds because it’s just 19 seconds old and yeah, these are the three pods The third one is coming up Okay, because yeah, it says terminated because the hello world container its self destruct container, right? It prints hello world and exits That’s what happens here Same thing with replicas sets have mentioned two or three pods, which means that at all times there will be three pods running and my replica sets and replication controller is the one that will control this password Okay So yeah, that is pretty much it and that’s how easy and simple it is to work with kubernetes He’s right So you can have your own opinion You can choose whether you want to use Cuban at ease or you can choose if you want to use Docker swarm Okay, so my take on this is if you have a very simple application, then you would rather be better off with dr Storm Okay, and also if you have a very few clusters, which you are dealing with, but if you’re dealing with a real Prada environment, then I would say Cuban IDs is a better option And also when the containers are many number when you have a lot of containers, then it’s easier to work with communities You can just specify the configurations You can say that I need this many containers running at all the times I need this many nodes which are connected to my classroom and I will have these many Paul’s running in these nodes and whatever you say that will be followed by our communities So that is y cubed he’s is better in my opinion and you can have your own version So whatever your choices between the two I would like to listen to your opinion You can please put in your opinion in the comment box And if you have any doubts you can let me know Alright So before I end this video I would like to talk about the market share between Cuban at ease and Dockers warm when it comes to new articles or blogs written on these two tools

Then communities beats doctors form 9 is to 1 for every nine blogs written on humanities as one at known dr Swamp So that is the differential 90 percent to 10 percent Same thing with web searches, right? So communities has you know Vamo searches 90% more searches as compared to dr Storms 10% search and same thing you can say for GitHub stars and for your GitHub comments Okay So culinary is pretty much wins on every term here and it’s way more popular and it’s way more used and it’s probably more comfortable And if you have any problem at any point of time, you have a huge Community which will help you out with all the replies right off whatever your errors So if you want Simplicity, I would say go for doctors warm, but if you want classes friend and if you want to ensure High availability in your Prada specially then Humanities is your tool to go for but however, both are equally good And they are pretty much neck to neck on all the grounds and this was a statistic, which I picked up from Platform 9, which is a very famous or tech company, right? So they write about that So I think on that note, I would like to conclude today’s session and I’d like to thank you for watching the video to the very end Do let us know and what topics you want us to make more videos, and it would be a pleasure for us to do the same and with that I’d like to take my leave Thank you and happy learning I hope you have enjoyed listening to this video Please be kind enough to like It and you can comment any of your doubts and queries and we will reply them at the earliest do look out for more videos in our playlist And subscribe to Edureka channel to learn more Happy learning

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