'Docker: Connection from debian to postgres?

I'm trying to run a E-learning community server (ECS) https://www.freeit.de/en/campusconnect_ecs/index.html on a docker-compose system. This ECS needs a postgres-DB to be installed. So this is my first try

docker-compose.yml

version: "3"
services:
  debian:
    container_name: debian_test
    build: './stuff'
    restart: on-failure
    command: ["sleep","infinity"]
    links:
       - db

  db:
    image: postgres
    restart: always
    environment:
      POSTGRES_USER: root
      POSTGRES_PASSWORD: example
    ports:
      - "5432:5432"

and stuff/Dockerfile:

FROM debian:stretch

RUN apt-get update && apt-get install -y \
mysql-common libpq5 libsqlite3-0 openssl libxml2 libxslt1.1 libssl1.0.2 libmariadbclient18 libevent-2.0-5 libevent-core-2.0-5 libevent-extra-2.0-5 libreadline7 apt-transport-https

So I have debian in the first container and postgres in the other container. Now I enter the debian container, where I have installed ECS...

docker exec -it debian_test bash

...run the ECS. But here I receive the error:

Called from /opt/ecs4/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.10/lib/active_support/dependencies.rb:240:in `load_dependency'
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"?

How is it possible to connect these two containers?

Best, Alex

postgresqldockerdocker-composedebian


Solution 1:[1]

First: Where is the database-connection defined? Only in the compose file? Normaly you should set at least the database-server-name somewhere.

Second: Check if the containers are running in the same network?

docker inspect CONTAINER_ID OR NAME

The section is "NetworkSettings" -> "Networks"

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Philipp Schneider

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