读取容器的特定 Docker env_file

Question

I have a project with a .env file at the root of a Maven project that contains project related information. I want to have a separate env file called .creds.env in a module directory in the project so that I can add it to .gitignore . The .creds.env file contains a user name and password in the following format:

USER_NAME=user
USER_PASSWORD=password

In docker-compose.yml , I have the following to read the .creds.env file for the service:

  myservice:
    env_file:
      - ./module/.creds.env
    container_name: myservice
    build:
      context: ./
      dockerfile: ./module/Dockerfile
      args:
        USER_NAME: ${USER_NAME}
        USER_PASSWORD: ${USER_PASSWORD}

But the username and password are only being read from the root .env file and not from the module .creds.env

The project structure is like below:

|__ .env
|__ docker-compose.yml
|__ module
     |__ Dockerfile
     |__ .creds.env

I need help figuring out how to read the .creds.env file for the myservice container and continue to read the .env file for everything else.

Answer 1

You should remove USER_NAME and USER_PASSWORD in the root .env file.

Sounds like you can assume that your environments will always include the .creds.env file.

If you need a default value that you currently reference in .env , you may be able to use shell parameter substitution in your compose file:

  myservice:
    env_file:
      - ./module/.creds.env
    container_name: myservice
    build:
      context: ./
      dockerfile: ./module/Dockerfile
      args:
        USER_NAME: ${USER_NAME:-user}
        USER_PASSWORD: ${USER_PASSWORD:-mypass}