code: func (nDB *NetworkDB) Join(members []string) error {
  	nDB.Lock()
  	nDB.bootStrapIP = append([]string(nil), members...)
  	logrus.Infof("The new bootstrap node list is:%v", nDB.bootStrapIP)
  	nDB.Unlock()
  	return nDB.clusterJoin(members)
  }
docs: // Join joins this NetworkDB instance with a list of peer NetworkDB
  // instances passed by the caller in the form of addr:port