Setup a mongodb replicaset using docker.

docker-compose.yml

services:
  mongo1:
    image: mongo:5
    container_name: mongo1
    ports:
      - 27017:27017
    networks:
      - mongoCluster
    command: >
      mongod --replSet myReplicaSet --bind_ip localhost,mongo1

  mongo2:
    image: mongo:5
    container_name: mongo2
    ports:
      - 27018:27017
    networks:
      - mongoCluster
    command: >
      mongod --replSet myReplicaSet --bind_ip localhost,mongo2

  mongo3:
    image: mongo:5
    container_name: mongo3
    ports:
      - 27019:27017
    networks:
      - mongoCluster
    command: >
      mongod --replSet myReplicaSet --bind_ip localhost,mongo3

  initiate-replica:
    image: mongo:5
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    networks:
      - mongoCluster
    entrypoint: >
      bash -c "
      sleep 5 &&
      mongosh --host mongo1 --eval \"
      rs.initiate({
        _id: 'myReplicaSet',
        members: [
          { _id: 0, host: 'mongo1' },
          { _id: 1, host: 'mongo2' },
          { _id: 2, host: 'mongo3' }
        ]
      })
      \" && 
      tail -f /dev/null
      "
networks:
  mongoCluster:
    driver: bridge