version: '3.3'
services:
  mongo:
    image: mongo:4.2
    restart: unless-stopped
    environment:
      MONGO_INITDB_ROOT_USERNAME: username  # mongo username
      MONGO_INITDB_ROOT_PASSWORD: password  # mongo password
    volumes:
      - "./data:/data/db"  # persistent mongo data
    ports:
      - "27017:27017"  # expose mongo port to host machine
    networks:
      nginx:
        aliases:
          - mongodb

networks:
  nginx:
    external: true