Docker Compose

Environment Variable Reading

Through .env: TODO

Through inline env variables

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version: '3.8'
services:
  app:
    image: your-image:latest
    environment:
      - USER_NAME=${USER}
    volumes:
      - /home/${USER}/data:/data
    build:
      context: .
      args:
        USER_NAME: ${USER}

• we are creating a new environment variable USER_NAME=${USER}.
• We are mounting /home/${USER}/data (local machine) to /data (docker)

Use Cases

• docker-compose.yml:

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    stdin_open: true  # Keep stdin open to allow interactive mode, docker run -i
    tty: true         # Allocate a pseudo-TTY, docker run -t
  

  • docker ps -a: see all recently launched and exited containers
• Launch a docker container based on platform:
  • In docker-compose.yml:

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      services:
        runtime:
          profiles:
            - arm
    

  • In an upper level script:

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      ARCH=$(uname -m)
      CURRENT_DIR=$(dirname $(realpath docker-compose.yml))
      if [ "$ARCH" = "aarch64" ]; then
          docker compose --profile arm up
      fi
    

    Launch Docker Containers

• Caution: Docker containers are not completely ephemeral

  • Use docker composeup --build with --build to build the containers so they are ephemeral

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