docker-compose.gunicorn.yml

version: '3.8'

services:
  web:
    build: .
    ports:
      - 5000:5000
    volumes:
      - .:/app
    # Gunicorn logs are written to ./access.log and error.log files
    command:
      [
        'gunicorn',
        '-c',
        'deploy/gunicorn_config.py',
        '--workers',
        '4',
        '--access-logfile',
        '/app/access.log',
        '--error-logfile',
        '/app/error.log',
        '--log-level',
        'debug',
        '--capture-output',
        'app:create_app()',
      ]
    environment:
      FLASK_APP: app:create_app()
      ENV: production
      # Do not store passwords in git the in real-world setting!
      SQLALCHEMY_DATABASE_URI: postgresql://db:password@db:5432/db
      SQLALCHEMY_POOL_SIZE: 30
      SQLALCHEMY_MAX_OVERFLOW: 0
  db:
    image: postgres:13.4-alpine
    ports:
      - 5432:5432
    volumes:
      - pg_data:/var/lib/postgresql/data/
    environment:
      - POSTGRES_DB=db
      - POSTGRES_USER=db
      # Do not store passwords in git the in real-world setting!
      - POSTGRES_PASSWORD=password

volumes:
  pg_data: