Docker compose tips

Use docker-compose.override.yml

As describe here, if you create a docker-compose.override.yml next to your docker-compose.yml, you can override or add values to the docker file. This file is loaded by default. To ignore it, you must use the --ignore-override option.

For instance, with this docker-compose.yml:

version: '2'

web:
  image: example/my_web_app:latest
  links:
    - db
    - cache

db:
  image: postgres:latest

cache:
  image: redis:latest

and this docker-compose.override.yml:

version: '2'

web:
  volumes:
    - '.:/code'
  ports:
    - 8883:80

db:
  ports:
    - 5432:5432

when you run docker-compose up, it will be like you used this docker-compose.yml:

version: '2'

web:
  image: example/my_web_app:latest
  volumes:
    - '.:/code'
  ports:
    - 883:80
  links:
    - db
    - cache

db:
  image: postgres:latest
  ports:
    - 5432:5432

cache:
  image: redis:latest