Pass arguments into docker container from docker-compose.yml

Question

I'm trying to migrate from manually invoking docker like this:

docker run -v /tmp/bazel:/data -p 9090:8080 buchgr/bazel-remote-cache --max_size=1300

to using a docker-compose.yml file, but cannot seem to know how to pass the --max_size to the container from it:

version: "3"
services:
  worker:
    image: buchgr/bazel-remote-cache
    deploy:
      mode: replicated
      replicas: 2
      restart_policy:
        condition: on-failure
        delay: 10s
        max_attempts: 3
        window: 120s
    ports:
      - 9090:8080
      - 6060:6060
        #args:
        #- max_size=1300
    volumes:
      - "/bazel_cache:/data"

  visualizer:
    image: dockersamples/visualizer:stable
    ports:
      - 8080:8080
    stop_grace_period: 1m30s
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]

What am I missing here? I've tried the args: .. bit but docker complains about it:

$ docker stack deploy -c docker-compose.yml bazel_remote_cache
args Additional property args is not allowed

David Maze · Accepted Answer · 2020-10-13 19:02:01Z

6

Anything you pass after the image name in docker run is interpreted as the "command" part, and you'd pass this in a command: field in docker-compose.yml:

version: "3"
services:
  worker:
    command: --max_size=1300

You can separately override the entrypoint: (equivalent to docker run --entrypoint) if you need to replace that field.

If you control the service, consider also making it possible to set these values via environment variables; this is generally easier to set at the deployment layer than providing command-line arguments. If you can make the default main command be short, specifying command: run_service --max_size=1300 as a complete command is also clearer here.

answered Oct 13, 2020 at 19:02

David Maze

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