Docker Compose

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

Environment Variables

Environment variables are typically passed into Docker as a way to securely provide authentication, i.e. the root password for MariaDB. It would be antithetical to security to have the variables set within the Docker Compose file. Instead, instruct Docker Compose to pass in a variable that is set already in the local user's environment.

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

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