Django in Docker database volume

Using Django
1

I am new to Django and have been playing with the following tutorial:
https://testdriven.io/blog/dockerizing-django-with-postgres-gunicorn-and-nginx/
When I am running the production example towards the end, users I ad via the admin interface don’t seem to persist if I rerun the docker container even though a volume is created for the postgres data. Any ideas?

version: '3.7'

services:
  web:
    build:
      context: ./app
      dockerfile: Dockerfile.prod
    command: gunicorn hello_django.wsgi:application --bind 0.0.0.0:8000
    volumes:
      - static_volume:/home/app/web/staticfiles
      - media_volume:/home/app/web/mediafiles
    expose:
      - 8000
    env_file:
      - ./.env.prod
    depends_on:
      - db
  db:
    image: postgres:12.0-alpine
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    env_file:
      - ./.env.prod.db
  nginx:
    build: ./nginx
    volumes:
      - static_volume:/home/app/web/staticfiles
      - media_volume:/home/app/web/mediafiles
    ports:
      - 1337:80
    depends_on:
      - web

volumes:
  postgres_data:
  static_volume:
  media_volume:

Here is a link to the project:
https://github.com/testdrivenio/django-on-docker

2

Hi!

After docker-compose down, what’s the output of docker volume ls?

Also volumes indentation has to be aligned with services. I struggled a bit with this one :laughing:

3

I figured out was my problem was. I am new to docker as well and was blindly using the -v option on my docker compose down command without realizing that it removes the volume :rofl:

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