docker-compose.yml

version: '3.8' # Specifies the Docker Compose version being used.

services:
  app:
    # Defines the primary application service
    build:
      context: . # Specifies the build context, i.e., the current directory.
      dockerfile: Dockerfile # Specifies the Dockerfile used to build this service.
    ports:
      - "3000:3000" # Maps port 3000 on the host to port 3000 in the container.
    environment:
      # Defines environment variables for the application.
      - DB_HOST=mongodb # Hostname for the MongoDB service.
      - DB_PORT=27017 # Port for the MongoDB service.
      - DB_DATABASE=files_manager # Name of the database used by the application.
      - REDIS_HOST=redis # Hostname for the Redis service.
      - REDIS_PORT=6379 # Port for the Redis service.
      - APP_PORT=3000 # Port used by the application.
    depends_on:
      # Ensures these services start before this one.
      - mongodb
      - redis
    volumes:
      - .:/files_manager # Mounts the current directory into the container for live development.
    networks:
      - file-manager-network # Connects the app service to the custom network.
    command: [ "npm", "run", "start-server" ] # Command to start the application.

  worker:
    # Defines a worker service, potentially for background tasks.
    build:
      context: . # Uses the same build context as the `app` service.
      dockerfile: Dockerfile # Uses the same Dockerfile as the `app` service.
    environment:
      # Environment variables for the worker.
      - DB_HOST=mongodb
      - DB_PORT=27017
      - DB_DATABASE=files_manager
      - REDIS_HOST=redis
      - REDIS_PORT=6379
    depends_on:
      # Ensures these services start before this one.
      - app
      - mongodb
      - redis
    volumes:
      - .:/files_manager # Shares the code directory with the container.
    networks:
      - file-manager-network # Connects the worker service to the custom network.
    command: [ "./start-both.sh" ] # Command to run the worker process.

  mongodb:
    # Defines the MongoDB database service.
    image: mongo:6 # Specifies the MongoDB image version.
    container_name: mongodb # Assigns a custom name to the container.
    ports:
      - "27017:27017" # Maps port 27017 on the host to port 27017 in the container.
    volumes:
      - mongo_data:/data/db # Persists MongoDB data on the host.
    networks:
      - file-manager-network # Connects MongoDB to the custom network.

  redis:
    # Defines the Redis in-memory data store service.
    image: redis:alpine # Specifies the lightweight Redis image version.
    container_name: redis # Assigns a custom name to the container.
    ports:
      - "6380:6379" # Maps port 6380 on the host to port 6379 in the container.
    volumes:
      - redis_data:/data/redis # Persists Redis data on the host.
    networks:
      - file-manager-network # Connects Redis to the custom network.

volumes:
  # Defines named volumes for persistent storage.
  mongo_data: # Volume for MongoDB data.
  redis_data: # Volume for Redis data.

networks:
  file-manager-network:
    # Defines a custom bridge network for inter-container communication.
    driver: bridge # Uses the bridge network driver (default for Docker Compose).