Basic Django app running in Docker

docker-compose.yml

version: '3'
services:
  web:
    build: .
    restart: "always"
    command: python manage.py runserver 0.0.0.0:8000
    depends_on:
      - database
    ports:
      - "8000:8000"

  database:
    image: postgres
    environment:
      POSTGRES_USER: django_test
      POSTGRES_PASSWORD: django_test
      POSTGRES_DB: django_test

Dockerfile

FROM python:alpine
RUN apk add --update \
    build-base \
    postgresql-dev
WORKDIR /source
ADD requirements.txt .
RUN pip install -r requirements.txt
ADD . /source
CMD python manage.py runserver

settings.py

# This is the only thing which needs to be changed in the settings, for the purposes of this demo
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'django_test',
        'USER': 'django_test',
        'HOST': 'database',
        'PORT': 5432,
    }
}