Docker - Docker Compose

As an automation tester, I want run multi-container Docker application easily. To do that, I need to use the Docker Compose to run the multi-container with the YAML file.

Note: Basically, the Docker Compose is existed in Docker Desktop.

Prerequisite

• Docker is installed

Install Compose plugin

• (Mac, Win, Linux) Docker Desktop: If you have Desktop installed then you already have the Compose plugin installed.
• Linux systems: To install the Docker CLI’s Compose plugins use one of these methods of installation:
  • Using the convenience scripts offered per Linux distro from the Engine install section.
  • Setting up Docker’s repository and using it to install the compose plugin package.
  • Other scenarios, check the Linux install.
• Windows Server: If you want to run the Docker daemon and client directly on Microsoft Windows Server, follow the Windows Server install instructions.

Run the first Docker Compose

To run the first Docker Compose, we can following these steps.

• Create new file docker-compose.yml with below content

version: "3"
services:
  chrome:
    image: selenium/node-chrome:4.0.0-rc-1-prerelease-20210618
    volumes:
      - /dev/shm:/dev/shm
    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_OVERRIDE_MAX_SESSIONS=true
      - SE_NODE_MAX_SESSIONS=10

  firefox:
    image: selenium/node-firefox:4.0.0-rc-1-prerelease-20210618
    volumes:
      - /dev/shm:/dev/shm
    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_OVERRIDE_MAX_SESSIONS=true
      - SE_NODE_MAX_SESSIONS=10     
 
  selenium-hub:
    image: selenium/hub:4.0.0-rc-1-prerelease-20210618
    container_name: selenium-hub
    ports:
      - "4442:4442"
      - "4443:4443"
      - "4444:4444"

• Access the folder contain the new file and run the command

  docker compose up

• After the setting up is done, we access the url http://localhost:4444/ui/index.html to verify it is run correctly.

Video guide