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Docker-compose-intro.md

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Docker-compose

Docker-compose sits on top of docker and creates high-level abstractions - services composed of a number of Docker containers, setting parameters that would otherwise be passed to Docker on the command-line:

  • Names of images
  • Names of containers
  • Environment variables
  • Port bindings
  • Volume bindings
  • Container links
  • ... and other tweaks

In our deployments, customizable parameters are in separate environment variable files referenced from the docker-compose files.

Once you customize the variables (having them in a separate file referenced via env_file makes them separate from the code), you can then:

  • Start everything up (interactively) and watch the console:

      docker-compose up

  • Cancel this session with Ctrl-C

  • Start again in the background (detached):

      docker-compose up -d

  • Watch the logs with:

      docker-compose logs -f

(and again escape with Ctrl-C - this time just detaching)

  • Stop and remove the containers:

      docker-compose stop
  docker-compose rm -f -v

  • Up again:

      docker-compose up -d

  • Fetch updated images:

      docker-compose pull

  • Update (re-create) the running containers:

      docker-compose up -d

Note: docker-compose up -d updates (re-creates) the container whenever anything changes, otherwise just make sure the container is started. So if a new image is ready (pulled) or the environment variables file has changed, it would get re-created.