Use docker to build selenium grid distributed environment practice

The following are the practical steps to build a Selenium Grid distributed environment using Docker:

1. Install Docker: First, make sure you have Docker Engine installed. You can select the appropriate installation method according to your OS and complete the installation.
2. Compose the Docker Compose file: Create a file called docker-compose.yml and compose it with the following content:

version: '3'
services:
  hub:
    image: selenium/hub
    ports:
      - 4444:4444
  chrome:
    image: selenium/node-chrome
    depends_on:
      - hub
    environment:
      - HUB_HOST=hub
  firefox:
    image: selenium/node-firefox
    depends_on:
      - hub
    environment:
      - HUB_HOST=hub

1. Start the Selenium Grid environment: In a terminal, navigate to the directory containing the docker-compose.yml file and run the following command to start the Selenium Grid environment:

docker-compose up -d

This will download and start the required images and create a distributed environment consisting of Selenium Hub and two nodes (a Chrome node and a Firefox node).

1. Verify the environment: Visit http://localhost:4444/grid/console in your browser and you will see Selenium Grid's console page showing the configured nodes and their availability.
2. Running Tests: Now you can run Selenium tests in a distributed environment. In the test code, specify the URL of Selenium Grid as http://localhost:4444/wd/hub and select the desired browser (Chrome or Firefox).

Through these steps, you can use Docker to build a Selenium Grid distributed environment and run Selenium tests in parallel on multiple nodes. According to actual needs, you can also perform more advanced configurations and extensions, such as adding more nodes, configuring browser versions, and so on.