mongo1:
  hostname: mongo1
  container_name: localmongo1
  image: mongo
  expose:
    - 27017
  ports:
    - 27017:27017
  restart: always
  entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
  volumes:
    - <VOLUME-DIR>:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo
    expose:
      - 27017
    ports:
      - 27018:27017
    restart: always
    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo
    expose:
      - 27017
    ports:
      - 27019:27017
    restart: always
    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]