Docker-compose environment variables

Question

I am trying to setup a postgres container and want to setup the postgres login with:

POSTGRES_USER: docker
POSTGRES_PASSWORD: docker

So I have

Answer 1

I struggled with this for a while and wasn't having luck with the accepted answer, I finally got it to work by removing the container:

docker-compose rm postgres

And then the volume as well:

docker volume rm myapp_postgres

Then when I did a fresh docker-compose up I saw CREATE ROLE fly by, which I'm assuming is what was missed on the initial up.

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The reasons for this are elaborated on here, on the Git repo for the Docker official image for postgres.