Selenium 4 Grid With Docker: Install Docker on Windows OS

Tutorial 26 - Selenium 4 Grid With Docker: Install Docker on Windows OS

What you will Learn:

  • Quick Overview of Selenium 4 Grid Integration with Docker

  • What is Docker container?

  • VM and​​ Docker Container are different

  • Install Docker on Windows

Quick Overview of Selenium 4 Grid Integration with Docker

So far, we have learnt how to setup a selenium hub and node on the same machine. In the real world, the hub and node(s) are setup on a separate machine. A separate machine can be a virtual machine or docker container (we will discuss the difference between them soon). We will now learn about how to integrate Selenium 4 grid with docker. Our hub (selenium server grid) will be setup in one machine and node will be setup in a docker container.​​ 

Before we actually start practically learning about Selenium 4 grid and Docker integration, we have to first understand about docker.

What is Docker container?

Let us understand the docker concept by supposing that you have to work on 2 important projects (or apps) in parallel.

#app 1 => has java 7 dependency

#app 2 => has java 8 dependency

Now if you setup java 7 on your machine (for app 1), you will not be able to work on app 2 on the same machine and vice-versa. This is a huge problem. Now what do we do?

The solution to this problem is that we will create 2 separate workspaces. First workspace will have all dependencies related to app#1 and second workspace will have all dependencies related to app#2. In​​ docker terminology, these workspaces are called as containers.

VM and Docker Container are different

Refer the above diagram to understand the difference between virtual machine and docker container.

The left hand side gives a simple overview of VM. So basically, we install Oracle virtualbox on our host operating system. We then setup guest machines on top of this oracle virtualbox. Finally we deploy the apps on these guest operations systems. VM is heavyweight and consumes lot of resources (RAM, cpu etc). Moreover, every VM will have its own kernel. The below figure is a glimpse of guest operating systems in oracle virtualbox. So, in summary, a virtual machine is a complete OS in itself (in the below figure, you can see 4 ubuntu virtual machines). So, in​​ our above example, you can say that, #app1 will be setup in ubuntu1 VM and #app2 will be setup in another ubuntu VM and so on

The right hand side gives an overview of docker container. Docker is lightweight and consumes less resources (docker shares​​ kernel of host OS). We simply have to install docker, create a container and then deploy app#1 inside this container. Similarly, we will create another container and deploy app#2. So these apps are containerized docker applications.

Install Docker on Windows

To install Docker on windows, go to the official page

https://docs.docker.com/docker-for-windows/install/


Click ‘Docker Desktop for Windows’

Double click the above exe to start​​ installation and grant windows admin permissions to proceed.​​ 

Ensure that both the checkboxes are selected as shown below

Click Ok and wait for installation to complete

‘Close and restart’ to restart your machine.

After restart, docker icon can be seen​​ on the desktop

Click the icon to start docker

You would see below message at the bottom right hand side tray of your machine. It might take 10-12 mins to start docker on your machine​​ 

You might get the below popup

Click Start, this might lead to below popup

If you get below popup, click ‘Continue’

Notice the url in the below popup:​​ https://aka.ms/wsl2kernel​​ 

Launch the url​​ https://aka.ms/wsl2kernel

You would​​ be redirected to below link:

https://docs.microsoft.com/en-us/windows/wsl/install-win10#step-4---download-the-linux-kernel-update-package​​ 

Click the above link to download latest package of wsl_update_x64.msi​​ 

Double click the package to install​​ 

Click Next to start installation

Grant windows admin permissions to proceed.

Click Next

Click Finish

Restart machine.

Click​​ docker icon on your desktop

You might get below popup

Click Start.

Grant windows permissions.

Also Check:​​ Selenium Webdriver Training

Click docker icon once more

You would see ‘Docker engine starting’

After few minutes below comes up

You can start or skip tutorial if you want to.

Let us click ‘Skip tutorial’ to start docker engine, see below

This may take few minutes. If you see above window for more than 5-7 mins or so, close the window and restart the docker desktop icon.

As shown below, when we mouse hover bottom left hand side​​ docker​​ ​​ icon, we can see RUNNING which means docker engine is now running​​ 

In the next article we would see some of the common problems encountered in docker installation on Windows OS and how to resolve them.

Thank you for reading!

Also Check:​​ Selenium Tutorials

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