docker-compose.yaml

version: '3'
services:
  my-app:
    image: ${DOCKER_REGISTRY}/my-app:1.0.0
    ports:
      - 3000:3000
  # my-app application container by building image locally.
  # my-app:  # name of the application service.
  #   build: # specify the directory of the Dockerfile.
  #     context: .
  #     dockerfile: Dockerfile
  #   image: my-app:1.0.0 # image name built via Dockerfile from application.
  #   container_name: my-app # container name hosting the application image.
  #   ports:
  #     - 3000:3000 # specify ports forwarding
  #     # Below database enviornment variable for api is helpful when you have to use database as managed service.
  #   environment:
  #     - MONGO_DB_USERNAME=admin
  #     - MONGO_DB_PWD=password
  #   links:
  #     - "mongodb"
  # mongodb container image.
  mongodb:
    image: mongo
    ports:
      - 27017:27017
    environment:
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=password
    volumes:
      - mongo-data:/data/db

  # mongo-express container image.
  mongo-express:
    image: mongo-express
    restart: always # fixes MongoNetworkError when mongodb is not ready on starting mongo-express.
    ports:
      - 8080:8081 # specify ports forwarding.
    environment:
      - ME_CONFIG_MONGODB_ADMINUSERNAME=admin
      - ME_CONFIG_MONGODB_ADMINPASSWORD=password
      - ME_CONFIG_MONGODB_SERVER=mongodb
    depends_on:
      - mongodb
volumes:
  mongo-data:
    driver: local