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// docker-compose
version: "3"

services:
  mongors1:
    hostname: mongors1
    container_name: mongors1
    image: mongo:4.0.6
    command: mongod --replSet mongors --port 27017 --dbpath /data/db
    ports:
      - 20001:27017
    volumes:
      - mongors1:/data/db

  mongors2:
    hostname: mongors2
    container_name: mongors2
    image: mongo:4.0.6
    command: mongod --replSet mongors --port 27017 --dbpath /data/db
    ports:
      - 20002:27017
    volumes:
      - mongors2:/data/db

  mongors3:
    hostname: mongors3
    container_name: mongors3
    image: mongo:4.0.6
    command: mongod --replSet mongors --port 27017 --dbpath /data/db
    ports:
      - 20003:27017
    volumes:
      - mongors3:/data/db

volumes:
  mongors1: {}
  mongors2: {}
  mongors3: {}

config = {
  _id: "mongors",
  members: [
    { _id : 0, host : "mongors1:27017" },
    { _id : 1, host : "mongors2:27017" },
    { _id : 2, host : "mongors3:27017" }
  ]
}

rs.initiate(config)

mongo 'mongodb;//localhost:20001,localhost:20002,localhsot:20003/?replicaSet=mongors'
mongo 'mongodb;//192.168.1.100:20001,192.168.1.100:20002,192.168.1.100:20003/?replicaSet=mongors'
....

version: "3"

services:
  mongos:
    container_name: mongos
    image: mongo:4.0.6
    command: mongos --configdb cfgrs/192.168.0.102:40001,192.168.0.102:40002,192.168.0.102:40003 --bind_ip 0.0.0.0 --port 27017
    ports:
      - 60000:27017
...............