MongoDB Replica Set with Docker

docker-compose.yml

version: '2'
services:
  mongo1:
    container_name: mongo1
    image: daocloud.io/mongo
    ports:
      - 27017:27017
    expose:
      - 27017
    networks:
      - mongo
    command: mongod --replSet rs0 --smallfiles --oplogSize 128

  mongo2:
    container_name: mongo2
    image: daocloud.io/mongo
    expose:
      - 27017
    networks:
      - mongo
    command: mongod --replSet rs0 --smallfiles --oplogSize 128

  mongo3:
    container_name: mongo3
    image: daocloud.io/mongo
    expose:
      - 27017
    networks:
      - mongo
    command: mongod --replSet rs0 --smallfiles --oplogSize 128

networks:
  mongo:
    driver: bridge    

master

db.createUser(
{
    user: "xxx",
    pwd: "xxx",
    roles: [ "root" ]
})

docker exec -it mongo1 mongo
connecting to: test
> rs.initiate()
> rs.add("mongo2:27017")
> rs.add("mongo3:27017") 
> rs.status();

secondary

 rs.slaveOk();

http://www.jianshu.com/p/4d86e9c33e0d

http://shellfu.com/setting-up-a-mongodb-replica-set-on-docker/