Docker Compose

Docker Compose is a method for creating containers through configuration files.

Installation

Most Linux distributions offer a docker-compose package.

Configuration

Compose Files

Volumes

Docker supports two methods for binding volumes, hereafter referred to as the 'long syntax' and the 'short syntax'. Docker Compose supports two parallel methods. Upstream recommendation is to use the long syntax.

The long syntax is as follows:

container_name: CONTAINER
version: 0.1
services:
  web:
    image: IMAGE
    volumes:
      - type: bind
        source: relative/source/path
        target: /absolute/target/path
        read only: true

The short syntax is as follows:

container_name: CONTAINER
version: 0.1
services:
  web:
    image: IMAGE
    volumes:
      - relative/source/path:/absolute/target/path:ro

Port Management

To give a container access to ports, use:

container_name: CONTAINER
version: 0.1
services:
  web:
    image: IMAGE
    ports:
      - 8888:8888

Environment Variables

To pass in an environment variable from the local environment to a Docker container, use:

container_name: CONTAINER
version: 0.1
services:
  web:
    image: IMAGE
    environment:
      - VARIABLE1
      - VARIABLE2

See also

Docker com,pose reference documentation

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