[SOLVED] How to pass arguments to a pre-built docker image through docker compose

How to pass arguments to a pre-built docker image through docker compose

I want to pass some arguments to a prebuilt docker image through the compose file. So, I don't have the Dockerfile and I can't use the context.

For instance, in the docker hub documentation of the ganache-cli image, there is the possibility to use the following command to run

docker run --detach --publish 8545:8545 trufflesuite/ganache-cli:latest --accounts 10 --debug

The question is, how to pass this accounts 10 through the docker compose file?

So far I have

ganache:
  network_mode: 'host'
  image: "trufflesuite/ganache-cli:latest"

Solution

Whatever is used after the image name in a docker run command replaces any CMD statement in the image and is passed to the entrypoint as parameters - or, if there is no entrypoint - just run as a command.

To have the equivalent of your docker run command in a docker-compose file, you'd create something like this:

ganache:
  image: trufflesuite/ganache-cli:latest
  command: --accounts 10 --debug
  ports:
    - 8545:8545

Then you'd run it using docker compose up -d or docker-compose up -d depending on the version of compose you have installed.