Docker Compose for Django + Celery + Redis + PostgreSQL

services:
  web:
    build: .
    command: gunicorn myproject.wsgi:application --bind 0.0.0.0:8000
    ports:
      - target: 8000
        mode: ingress
    environment:
      - DATABASE_URL=postgresql://postgres:${POSTGRES_PASSWORD}@db:5432/django
      - REDIS_URL=redis://redis:6379/0
      - DJANGO_SECRET_KEY=${DJANGO_SECRET_KEY}
      - DJANGO_SETTINGS_MODULE=myproject.settings.production
    healthcheck:
      test:
        - CMD
        - curl
        - -f
        - http://localhost:8000/
      interval: 30s
      timeout: 5s
      retries: 3
    depends_on:
      - db
      - redis
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
  worker:
    build: .
    command: celery -A myproject worker --loglevel=info
    environment:
      - DATABASE_URL=postgresql://postgres:${POSTGRES_PASSWORD}@db:5432/django
      - REDIS_URL=redis://redis:6379/0
      - DJANGO_SECRET_KEY=${DJANGO_SECRET_KEY}
      - DJANGO_SETTINGS_MODULE=myproject.settings.production
    depends_on:
      - db
      - redis
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
  beat:
    build: .
    command: celery -A myproject beat --loglevel=info
    environment:
      - DATABASE_URL=postgresql://postgres:${POSTGRES_PASSWORD}@db:5432/django
      - REDIS_URL=redis://redis:6379/0
      - DJANGO_SECRET_KEY=${DJANGO_SECRET_KEY}
    depends_on:
      - db
      - redis
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
  db:
    image: postgres:16
    ports:
      - target: 5432
        mode: host
    environment:
      - POSTGRES_DB=django
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
    healthcheck:
      test:
        - CMD-SHELL
        - pg_isready -U postgres
      interval: 10s
      timeout: 5s
      retries: 5
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
    x-defang-postgres: true
  redis:
    image: redis:7-alpine
    ports:
      - target: 6379
        mode: host
    healthcheck:
      test:
        - CMD
        - redis-cli
        - ping
      interval: 10s
      timeout: 5s
      retries: 5
    deploy:
      resources:
        reservations:
          cpus: "0.5"
          memory: 256M
    restart: unless-stopped
    x-defang-redis: true