docker-compose.yml

---
services:
  web:
    depends_on:
      - app
    image: nginx:${NGINX_VERSION:-1.25.1}-alpine
    volumes:
      - ${PWD}/templates:/etc/nginx/templates:ro
    networks:
      - app
    ports:
      - 8080:80

  app:
    depends_on:
      - db
    build:
      context: app
      args:
        - PYTHON_VERSION=${PYTHON_VERSION:-3.11.4}
        - POSTGRESQL_VERSION=${POSTGRESQL_VERSION:-15.3}
    networks:
      - app
      - db
    environment:
      - PGHOST=db
      - PGPORT=5432
      - PGUSER=postgres
      - PGPASSWORD=${POSTGRES_PASSWORD}
    stop_signal: SIGINT
    deploy:
      replicas: 3

  db:
    image: postgres:${POSTGRESQL_VERSION:-15.3}-alpine
    networks:
      - db
    volumes:
      - pgdata:/var/lib/postgresql/data/pgdata:rw
    environment:
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}

      # ! If the data volume you're using is a filesystem mountpoint (like with
      # ! GCE persistent disks), or remote folder that cannot be chowned to the
      # ! postgres user (like some NFS mounts), or contains folders/files (e.g.
      # ! lost+found), Postgres initdb requires a subdirectory to be created
      # ! within the mountpoint to contain the data.
      # ? https://github.com/docker-library/docs/tree/master/postgres#pgdata
      - PGDATA=/var/lib/postgresql/data/pgdata

networks:
  app:
  db:

volumes:
  pgdata: