docker-compose.yml

# Define the version of docker-compose file format we are using
version: '3'


# Configure the networks available for in compose file
networks:

  # Redefine part of the default network
  default:

    # Just renaming it
    name: mmai-backend-network


# Define the services we are creating
services:

  # Create a service named mmai-db
  mmai-db:

    # Service uses the latest mongo Docker image
    image: mongo:latest

    # Name the container
    container_name: "mmai-db-container"

    # Expose container port 27017 to host machine port 27017
    # Essentially makes it so that if someone connects to the host running this
    # container on port 27017, it is directed to port 27017 on the container.
    # Outside the host computer, it looks like the host itself is running
    # something on port 27017, rather than a container running it.
    # Port 27017 is a standard MongoDB port.
    ports:
      - "27017:27017"
    
    # Define folders/files to use in the container
    volumes:

      # Use folder /db_data on the host machine to store the container's database files.
      # Allows us to destroy the container without destroying the database files,
      # because they are stored on the host and only shared to the container.
      - ./db_data:/data/db

      # Copy our init.js script to a folder that exists in the container already.
      # It's used to initialize the database. ":ro" makes it read-only.
      - ./init.js:/docker-entrypoint-initdb.d/init-mongo-js:ro


  # Create a service named mmai-api
  mmai-api:

    # Build an image using the mmai-api folder's Dockerfile
    build: ./mmai-api

    # Name the container
    container_name: "mmai-api-container"
    
    # Port 3000 is a standard Express port.
    ports:
      - "3000:3000"