Where is the error in docker-compose file?

Question

Docker

Good day!
I want to build a django application with postgresql.
dockerfile example

FROM python:3.6
ENV PYTHONUNBUFFERED 1

COPY ./requirements /requirements/
RUN pip install -r /requirements/local.txt

RUN apt-get update && apt-get upgrade

RUN apt-get install -y \
    postgresql-server-dev-all \
    postgresql-client

WORKDIR /app

EXPOSE 8080

docker-compose example

version: "2"
services:
  db:
    image: postgres
    expose:
      - "5432"
  web:
    restart: always
    image: test-project-django
    env_file: ./config/.env
    command: ./manage.py runserver 0.0.0.0:8080
    ports:
      - "8080:8080"
    volumes:
      - .:/app
    links:
      - db

Contents of the .env file

DJANGO_DEBUG=True
DJANGO_SECRET_KEY="secret"
DJANGO_DATABASE_URL=postgres:///docker_django

as a result, when I try to docker-compose up I get the following error

django.db.utils.OperationalError: 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"?

Tell me, please, how to fix it?

Answer 1

Likbez:
Regarding your problem: you have django configured to connect locally to a database that is not running (and it is not clear why it is in the image at all), while it should be configured to connect to another container.