replicaset_conf = {
  _id: 'demo-dev',
  members: [
    {
      _id: 0,
      host: '127.0.0.1:27001'
    },
    {
      _id: 1,
      host: '127.0.0.1:27002'
    },
    {
      _id: 2,
      host: '127.0.0.1:27003'
    }
  ]
}