version: "3.9"

# Define services for your application
services:

  # Example web application service
  web:
    image: nginx:latest # Replace with your web application image
    container_name: web_app
    ports:
      - "80:80" # Expose port 80 for HTTP traffic
      - "443:443" # Expose port 443 for HTTPS traffic (configure SSL certificates)
    volumes:
      - ./html:/usr/share/nginx/html # Mount your web application files
      - ./nginx/conf.d:/etc/nginx/conf.d # Mount Nginx configuration files
    depends_on:
      - app # Ensure the app service is running before starting the web service
    restart: always # Restart the service if it fails
    healthcheck:
      test: ["CMD-SHELL", "curl -f http://localhost || exit 1"] # Check if the web server is responding
      interval: 30s # Check every 30 seconds
      timeout: 10s # Timeout after 10 seconds
      retries: 3 # Retry up to 3 times
    networks:
      - app_network # Connect to the application network
    deploy:
      resources:
        limits:
          cpus: "0.5" # Limit CPU usage to 0.5 cores
          memory: 512M # Limit memory usage to 512MB
    environment:
      - REPLACE_ME=YOUR_VALUE_HERE # Example environment variable

  # Example application service
  app:
    build:
      context: ./app # Path to the application Dockerfile
    container_name: app_service
    environment:
      - DATABASE_URL=postgres://user:password@db:5432/database # Database connection string
      - SECRET_KEY=YOUR_SECRET_KEY # Secret key for your application
    depends_on:
      - db # Ensure the database service is running before starting the app service
    restart: always # Restart the service if it fails
    healthcheck:
      test: ["CMD-SHELL", "curl -f http://localhost:8000/health || exit 1"] # Check if the application is responding
      interval: 30s # Check every 30 seconds
      timeout: 10s # Timeout after 10 seconds
      retries: 3 # Retry up to 3 times
    networks:
      - app_network # Connect to the application network
    deploy:
      resources:
        limits:
          cpus: "1" # Limit CPU usage to 1 core
          memory: 1G # Limit memory usage to 1GB
    volumes:
      - ./app:/app  # Mount the application code

  # Example database service
  db:
    image: postgres:14 # Use Postgres version 14
    container_name: database
    volumes:
      - db_data:/var/lib/postgresql/data # Persist database data
    environment:
      - POSTGRES_USER=user # Database user
      - POSTGRES_PASSWORD=password # Database password
      - POSTGRES_DB=database # Database name
    restart: always # Restart the service if it fails
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U user -d database"] # Check if the database is ready
      interval: 30s # Check every 30 seconds
      timeout: 10s # Timeout after 10 seconds
      retries: 3 # Retry up to 3 times
    networks:
      - app_network # Connect to the application network
    deploy:
      resources:
        limits:
          cpus: "0.5" # Limit CPU usage to 0.5 cores
          memory: 512M # Limit memory usage to 512MB

# Define networks for communication between services
networks:
  app_network:
    driver: bridge # Use a bridge network for internal communication

# Define volumes for persistent data storage
volumes:
  db_data: # Volume for database data