☀️ In this use case, we will see how to execute the selenium script execution inside AWS EC2 instances using Selenium grid and docker image.

Flow Diagram:

🦋 EC2 instance creation with preinstalled docker amazon Linux AMI

✏️ Go to AWS Management console, In AMI search for an 'docker' and select one of the Linux AMI where docker already been pre-installed as below.

✏️ Create a new key-pair in order to connect with EC2 instances. If you are using putty please make you are selecting the .ppk file

✏️ In Network settings, make sure you add the inbound security group with port 4444 and 7900 as below

✏️ Once you click create instances make sure your instance is up and running

✏️Click on connect option using SSH client as below

ssh -i "vj.pem" ec2-user@<ipv4 public dns>.compute-1.amazonaws.com

You can either use SSH Client via putty agent or windows powershell. Once you are connected you will get as below

🦋 How to install the docker in amazon EC2 instance if not installed

🐳 Consider that if selected AMI doesn't contain any docker. You can install the docker by using below commands

sudo yum update
sudo yum install -y docker
sudo usermod -a -G docker ec2-user
sudo service docker start
sudo chkconfig docker on

🐳 You can check for docker version using below command

docker --version

🦋 How to pull the selenium standalone chrome image from docker hub

👨🏻‍💻 In order to run your webdriver tests remotely. You need to pull and install the latest standalone selenium chrome version as below

docker run -d -p 4444:4444 -p 7900:7900 selenium/standalone-chrome:latest

👨🏻‍💻 To check containers are up and running. Enter the below command

docker ps -a

👨🏻‍💻 Similarly, if you need install the latest standalone firefox version. You can use the below command

docker run -d -p 4444:4444 -p 7900:7900 selenium/standalone-firefox:latest

👨🏻‍💻 Copy the IPV4 or public IPV4 address with colon 4444, open it in a new tab

👨🏻‍💻 You can check how many images installed using below docker command

docker images

👨🏻‍💻If you wish to install the docker compose to scale up the number of nodes. Below is the command

sudo curl -L https://github.com/docker/compose/releases/download/1.21.0/docker-compose-`uname -s`-`uname -m` | sudo tee /usr/local/bin/docker-compose > /dev/null
sudo chmod +x /usr/local/bin/docker-compose
docker-compose --version

🦋 Another way - Creation of selenium grid with docker compose yml file

✏️ Create the docker-compose yml file using below command

touch docker-compose.yml

✏️ Edit the newly created docker compose yml file in visual editor by pressing i in your keyboard. Enter the below yml file and quit using :wq!

version: "3"
services:
  chrome:
    image: selenium/node-chrome:4.14.1
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
      - SE_NODE_MAX_INSTANCES=3
  edge:
    image: selenium/node-edge:4.14.1
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443

  firefox:
    image: selenium/node-firefox:4.14.1
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443

  selenium-hub:
    image: selenium/hub:4.14.1
    container_name: selenium-hub
    ports:
      - "4442:4442"
      - "4443:4443"
      - "4444:4444"

✏️ Enter the following command to make the docker up and running

docker-compose up -d

✏️ You will get below output once done with your installation

✏️ You can check all the docker containers running by using the below command

docker ps -a

🦋 Checking the selenium grid using EC2 IPV4 address and port 4444

⭐ Checking the selenium grid using IPV4 public ip address and port 4444

🦋 Configure your EC2 IPV4 instance address in your execution script as a hub

☀️ You can check the current execution and queue size in your selenium grid as below

☀️ You can increase your queue size using below command

docker compose -f docker-compose-v3.yml up --scale chrome=2

☀️ Below are the changes to be done in your driver configuration files

public void user_login_page() throws MalformedURLException {
 WebDriverManager.chromedriver().setup();
 DesiredCapabilities capabilities=new DesiredCapabilities();
 capabilities.setBrowserName("chrome");
 driver = new RemoteWebDriver(new 
 URL("http://52.66.250.166:4444/wd/hub"), capabilities);
 driver.get("https://selectorshub.com/");
}

☀️ You can tear down the container using below command

docker-compose down

☀️ Please make sure terminate your ubuntu instances created to avoid costs

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