version: '3'
services:
  app:
    container_name: docker-node-mongo
    restart: always  //to restart the service if failed
    build: . // to get the image from current work dir not dockerhub(Dockerfile)
    ports:
      - '80:3000'
    links:
      - mongo
  mongo:
    container_name: mongo
    image: mongo // to get image from dockerhub
    ports:
      - '27017:27017'