6. Cô Lập Mạng Docker Compose: Phân Tách Network Nội Bộ, Giới Hạn Tài Nguyên & Xoay Vòng Log

# docker-compose.yml - CỤM DỊCH VỤ CÔ LẬP TOÀN DIỆN
version: '3.8'

networks:
  frontend-network:
    driver: bridge
  backend-network:
    internal: true # Cô lập hoàn toàn khỏi Internet

volumes:
  postgres_data:

services:
  postgres:
    image: postgres:16-alpine
    container_name: prod_postgres
    restart: unless-stopped
    environment:
      POSTGRES_DB: ${POSTGRES_DB}
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
    volumes:
      - postgres_data:/var/lib/postgresql/data
    networks:
      - backend-network
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
      interval: 10s
      timeout: 5s
      retries: 5

  app:
    build: .
    container_name: prod_app
    restart: unless-stopped
    env_file: .env
    ports:
      - "127.0.0.1:5000:5000" # Chỉ bind loopback cho Nginx
    networks:
      - frontend-network
      - backend-network
    depends_on:
      postgres:
        condition: service_healthy
    deploy:
      resources:
        limits:
          cpus: '2.0'
          memory: 1024M