Mongo cluster

docker-compose.yml

version: '3.1'
services:
    mongo1:
      hostname: mongo1
      container_name: localmongo1
      image: mongo
      expose:
      - 27017
      restart: always
      entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
    mongo2:
      hostname: mongo2
      container_name: localmongo2
      image: mongo
      expose:
      - 27017
      restart: always
      entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs1" ]
    mongo3:
      hostname: mongo3
      container_name: localmongo3
      image: mongo
      ports:
      - 27017:27017
      restart: always
      entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs2" ]