MongoDB Docker Replicaset

version: '3'

services:
  mongo_1:
    container_name: mongo_1
    image: 'bitnami/mongodb:latest'
    environment:
      - MONGODB_REPLICA_SET_MODE=primary
    ports:
      - "30001:27017"
    networks:
      - mongonet
  mongo_2:
    container_name: mongo_2
    image: 'bitnami/mongodb:latest'
    depends_on:
      - mongo_1
    environment:
      - MONGODB_REPLICA_SET_MODE=secondary
      - MONGODB_PRIMARY_HOST=mongo_1
      - MONGODB_PRIMARY_PORT_NUMBER=30001
    ports:
      - "30002:27017"
    networks:
      - mongonet
  mongo_3:
    container_name: mongo_3
    image: 'bitnami/mongodb:latest'
    depends_on:
      - mongo_1
    environment:
      - MONGODB_REPLICA_SET_MODE=arbiter
      - MONGODB_PRIMARY_HOST=mongo_1
      - MONGODB_PRIMARY_PORT_NUMBER=30001
    ports:
      - "30003:27017"
    networks:
      - mongonet