docker-compose.yml

version: '3.8'  # Specifies the version of Docker Compose syntax to use.

services:
  web:
    image: fastapi-scraper  # The image to use for the FastAPI service. It assumes an image named 'fastapi-scraper' is available.
    build:
      context: .  # The build context is the current directory, meaning Docker will use the Dockerfile in this directory to build the image.
      dockerfile: Dockerfile  # Specifies the Dockerfile to use for building the image.
    ports:
      - "8000:8000"  # Maps port 8000 of the host to port 8000 of the container. This exposes the FastAPI application on port 8000.
    volumes:
      - .:/app  # Mounts the current directory (on the host) to /app in the container. This allows for live code updates and persistence.
    environment:
      - ENV=development  # Sets an environment variable ENV inside the container to 'development'. This can be used to differentiate between development and production environments.
    depends_on:
      - mongodb  # Specifies that the web service depends on the mongodb service. Docker Compose will start the mongodb service before the web service.
    networks:
      - app-network  # Connects the web service to the 'app-network' network.

  mongodb:
    image: mongo:latest  # Uses the latest MongoDB image from Docker Hub.
    ports:
      - "27018:27017"  # Maps port 27017 of the host to port 27017 of the container. This exposes MongoDB on port 27017.
    volumes:
      - mongodb-data:/data/db  # Mounts the volume 'mongodb-data' to /data/db in the container. This is where MongoDB stores its data.
    networks:
      - app-network  # Connects the mongodb service to the 'app-network' network.

networks:
  app-network:
    driver: bridge  # Defines a custom network named 'app-network' using the 'bridge' driver. This allows communication between services.

volumes:
  mongodb-data:  # Defines a named volume 'mongodb-data'. Docker manages this volume and persists MongoDB data across container restarts.