Docker Compose virtual development environment

docker-compose.yml

---
version: '2.1'

networks:
  app-net:

volumes:
  db-data:
  lib-data:

services:
  collect-deps:
    image: python:3.7-slim
    command: pip install --user -r requirements.txt
    environment:
      - DJANGO_DEBUG=1
      - DJANGO_DB_HOST=${DJANGO_DB_HOST:-database}
      - DJANGO_DB_PASS=${DJANGO_DB_PASS:-app}
      - DJANGO_DB_USER=${DJANGO_DB_USER:-app}
      - DJANGO_DB_NAME=${DJANGO_DB_NAME:-app}
    working_dir: /usr/src/app
    volumes:
      - .:/usr/src/app
      - lib-data:/root/.local/lib/python3.7/site-packages
    networks:
      - app-net
    depends_on:
      - database

  app:
    image: python:3.7-slim
    command: python manage.py runserver 0.0.0.0:8000
    environment:
      - DJANGO_DEBUG=1
      - DJANGO_DB_HOST=${DJANGO_DB_HOST:-database}
      - DJANGO_DB_PASS=${DJANGO_DB_PASS:-app}
      - DJANGO_DB_USER=${DJANGO_DB_USER:-app}
      - DJANGO_DB_NAME=${DJANGO_DB_NAME:-app}
    working_dir: /usr/src/app
    ports:
      - 8000:8000
    volumes_from:
      - collect-deps
    networks:
      - app-net
    depends_on:
      - database
      - collect-deps

  database:
    image: postgres:10-alpine
    restart: on-failure
    ports:
      - 5423:5432
    environment:
      - POSTGRES_DB=app
      - POSTGRES_PASSWORD=app
      - POSTGRES_USER=app
      - POSTGRES_INITDB_ARGS="-E 'UTF-8'"
    volumes:
      - db-data:/var/lib/postgresql/data:rw
    networks:
      - app-net