Connecting PostgreSQL db to Django project using Docker

问题

I have a problem connecting my Postgres database to django project on docker container. I have already tried every solution found on the internet and nothing seems to work. I've already added host all all all md5 to my pg_hba.conf file, listen_addresses = '*' to postgresql.conf. Here is log from lsof -i :5432:

postgres 19774 postgres    5u  IPv4 2046377      0t0  TCP *:postgresql (LISTEN)
postgres 19774 postgres    6u  IPv6 2046378      0t0  TCP *:postgresql (LISTEN)

I've tried to open 5432 port by using ufw allow 5432/tcp, it seems to be open.

My docker-compose.yml file:

version: '3.8'

services:
  db:
    image: postgres:12.0-alpine

    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    build: .
    container_name: db
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    networks:
      - djangonetwork
    ports:
      - '5432'

  web:
    build: 
        context: .
        dockerfile: Dockerfile
    command: python manage.py runserver 127.0.0.1:8000
    volumes:
      - ./TwitterClone/:/usr/src/TwitterClone/
    ports:
      - 8000:8000
    env_file:
      - ./.env
    depends_on:
      - db
    links:
      - db:db
    networks:
      - djangonetwork
networks:
    djangonetwork:
      driver: bridge
volumes:
  postgres_data:

settings.py:

try:
    DATABASE_PASSWORD = os.environ.get('POSTGRES_PASSWORD')
    DATABASE_USER = os.environ.get('POSTGRES_USER')
    DATABASE_NAME = os.environ.get('POSTGRES_DB')
except:
    print('Could not get environment variables')

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': DATABASE_NAME,
        'USER': DATABASE_USER,
        'PASSWORD': DATABASE_PASSWORD,
        'HOST': '127.0.0.1',
        'PORT': 5432,
    }
}

No matter what I try to do, I always end up getting that error:

django.db.utils.OperationalError: could not connect to server: Connection refused
Is the server running on host "127.0.0.1" and accepting
TCP/IP connections on port 5432?

Thank you in advance for any help, anything could help. Just let me know if you need more information from me, I will gladly provide it.

EDIT: I have edited my docker-compose file by deleting all networks related lines. Now I don't get the previous error, but it seems to have a problem with my PostgreSQL server running on port 5432:

ERROR: for db  Cannot start service db: driver failed programming external connectivity on endpoint db (a1ed9a70eddb931e5d2a26522cb95a2873e019029420f8b994146e6bebe5ce09): Error starting userland proxy: listen tcp 0.0.0.0:5432: bind: address already in use

来源：https://stackoverflow.com/questions/62729917/connecting-postgresql-db-to-django-project-using-docker

标签

django

postgresql

Docker