docker-compose.yml

version: '3.9'

services:
  web:
    image: nginx:latest  # Specifies the image to use
    container_name: my_nginx_container  # Name for the container
    restart: always  # Restart policy: no, always, on-failure, unless-stopped
    ports:
      - "80:80"  # Maps port 80 on host to 80 in container
    environment:
      - NGINX_HOST=${NGINX_HOST}  # Environment variables from .env file
      - NGINX_PORT=${NGINX_PORT}
    env_file:
      - .env  # Load environment variables from .env file
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf  # Mount a volume
    networks:
      - my_network
    depends_on:
      - db  # Ensures web starts after db
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost"]  # Check service health
      interval: 30s  # Run health check every 30s
      retries: 3  # Number of retries before marking unhealthy
      timeout: 10s

  db:
    image: postgres:latest
    container_name: my_postgres_container
    restart: unless-stopped
    ports:
      - "5432:5432"
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    env_file:
      - .env  # Load environment variables from .env file
    volumes:
      - pg_data:/var/lib/postgresql/data
    networks:
      - my_network

  redis:
    image: redis:latest
    container_name: my_redis_container
    restart: on-failure
    ports:
      - "6379:6379"
    networks:
      - my_network

volumes:
  pg_data:  # Named volume to persist PostgreSQL data

networks:
  my_network:
    driver: bridge  # Network driver type