Simple MongoDB cluster using docker compose (3 node cluster)

docker-compose.yml

version: '3'

services:
  node1:
    image: mongo
    ports:
      - 30001:27071
    volumes:
      - $HOME/mongoclusterdata/node1:/data/db
    networks:
      - mongocluster
    command: mongod --replSet comments
  node2:
    image: mongo
    ports:
      - 30002:27071
    volumes:
      - $HOME/mongoclusterdata/node2:/data/db
    networks:
      - mongocluster
    command: mongod --replSet comments
    depends_on :
      - node1
  node3:
    image: mongo
    ports:
      - 30003:27071
    volumes:
      - $HOME/mongoclusterdata/node3:/data/db
    networks:
      - mongocluster
    command: mongod --replSet comments
    depends_on :
        - node2

networks:
  mongocluster:
    driver: bridge

ports for mongo is 27017 and not 27071
Please correct