Extending postgres image using dockerfile with POSTGRES_PASSWORD

Question

I'm extending the postgres image with an argument POSTGRES_PASSWORD=postgres so that my derived container would already have a default password using docker build with dockerfile.

Whenever I ran psql -U postgres on the container from the derived image i made from postgres, I get:

could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

On my DockerFile I have:

ARG POSTGRES_PASSWORD=postgres
FROM postgres:alpine

RUN apk add --update nodejs
RUN apk add --update npm
RUN apk add --update erlang
RUN apk add --update elixir

CMD ["/bin/bash"]

then I ran

docker build -t myImage .
docker run --name sample -d -it myImage
docker exec -it sample bash

I want to run psql -U postgres on sample container (image extended from postgres).

This seems like you're looking for an orchestration system like Docker Compose, more than trying to fix these things in a Dockerfile. The CMD setting to run a shell instead of starting the database would be the immediate cause of your error. — David Maze
– David Maze, Commented Apr 14, 2019 at 13:53
@DavidMaze Making an image with elixir and postgres running is not possible? Should I use docker compose to connect postgres image and elixir image? — Ken Tan
– Ken Tan, Commented Apr 14, 2019 at 14:39
Yes, you should absolutely run your database and applications in separate containers. — David Maze
– David Maze, Commented Apr 14, 2019 at 15:32

Schisme · Accepted Answer · 2019-04-14 20:18:13Z

2

Try to replace ARG POSTGRES_PASSWORD=postgres by ENV POSTGRES_PASSWORD postgres

The postgres docker image documentation state that this parameter is an Environement Variable, so this might help.

answered Apr 14, 2019 at 20:18

Schisme

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