diff --git a/etcd/etcd.go b/etcd/etcd.go
index 4455bd741..5da3a3473 100644
--- a/etcd/etcd.go
+++ b/etcd/etcd.go
@@ -39,10 +39,9 @@ type Server struct {
 	raftPubAddr  string
 	tickDuration time.Duration
 
-	mode  atomicInt
-	nodes map[string]bool
-	p     *participant
-	s     *standby
+	mode atomicInt
+	p    *participant
+	s    *standby
 
 	client  *v2client
 	peerHub *peerHub
@@ -79,17 +78,13 @@ func New(c *config.Config, id int64) *Server {
 		raftPubAddr:  c.Peer.Addr,
 		tickDuration: defaultTickDuration,
 
-		mode:  atomicInt(stopMode),
-		nodes: make(map[string]bool),
+		mode: atomicInt(stopMode),
 
 		client:  newClient(tc),
 		peerHub: newPeerHub(c.Peers, client),
 
 		stopc: make(chan struct{}),
 	}
-	for _, seed := range c.Peers {
-		s.nodes[seed] = true
-	}
 
 	return s
 }
@@ -155,7 +150,7 @@ func (s *Server) Run() {
 			s.mu.Unlock()
 			next = s.p.run()
 		case standbyMode:
-			s.s = newStandby(s.id, s.pubAddr, s.raftPubAddr, s.nodes, s.client, s.peerHub)
+			s.s = newStandby(s.id, s.pubAddr, s.raftPubAddr, s.client, s.peerHub)
 			s.mode.Set(standbyMode)
 			s.mu.Unlock()
 			next = s.s.run()
diff --git a/etcd/standby.go b/etcd/standby.go
index 21d877f4a..09bd23917 100644
--- a/etcd/standby.go
+++ b/etcd/standby.go
@@ -40,8 +40,6 @@ type standby struct {
 	client  *v2client
 	peerHub *peerHub
 
-	nodes map[string]bool
-
 	leader      int64
 	leaderAddr  string
 	mu          sync.RWMutex
@@ -52,7 +50,7 @@ type standby struct {
 	*http.ServeMux
 }
 
-func newStandby(id int64, pubAddr string, raftPubAddr string, nodes map[string]bool, client *v2client, peerHub *peerHub) *standby {
+func newStandby(id int64, pubAddr string, raftPubAddr string, client *v2client, peerHub *peerHub) *standby {
 	s := &standby{
 		id:          id,
 		pubAddr:     pubAddr,
@@ -61,8 +59,6 @@ func newStandby(id int64, pubAddr string, raftPubAddr string, nodes map[string]b
 		client:  client,
 		peerHub: peerHub,
 
-		nodes: nodes,
-
 		leader:      noneId,
 		leaderAddr:  "",
 		clusterConf: config.NewClusterConfig(),
@@ -77,6 +73,7 @@ func newStandby(id int64, pubAddr string, raftPubAddr string, nodes map[string]b
 
 func (s *standby) run() int64 {
 	var syncDuration time.Duration
+	nodes := s.peerHub.getSeeds()
 	for {
 		select {
 		case <-time.After(syncDuration):
@@ -85,12 +82,14 @@ func (s *standby) run() int64 {
 			return stopMode
 		}
 
-		if err := s.syncCluster(); err != nil {
+		if update, err := s.syncCluster(nodes); err != nil {
 			log.Println("standby sync:", err)
 			continue
+		} else {
+			nodes = update
 		}
 		syncDuration = time.Duration(s.clusterConf.SyncInterval * float64(time.Second))
-		if s.clusterConf.ActiveSize <= len(s.nodes) {
+		if s.clusterConf.ActiveSize <= len(nodes) {
 			continue
 		}
 		if err := s.joinByAddr(s.leaderAddr); err != nil {
@@ -130,8 +129,8 @@ func (s *standby) serveRedirect(w http.ResponseWriter, r *http.Request) error {
 	return nil
 }
 
-func (s *standby) syncCluster() error {
-	for node := range s.nodes {
+func (s *standby) syncCluster(nodes map[string]bool) (map[string]bool, error) {
+	for node := range nodes {
 		machines, err := s.client.GetMachines(node)
 		if err != nil {
 			continue
@@ -140,21 +139,21 @@ func (s *standby) syncCluster() error {
 		if err != nil {
 			continue
 		}
-		s.nodes = make(map[string]bool)
+		nn := make(map[string]bool)
 		for _, machine := range machines {
-			s.nodes[machine.PeerURL] = true
+			nn[machine.PeerURL] = true
 			if machine.State == stateLeader {
 				id, err := strconv.ParseInt(machine.Name, 0, 64)
 				if err != nil {
-					return err
+					return nil, err
 				}
 				s.setLeaderInfo(id, machine.PeerURL)
 			}
 		}
 		s.clusterConf = config
-		return nil
+		return nn, nil
 	}
-	return fmt.Errorf("unreachable cluster")
+	return nil, fmt.Errorf("unreachable cluster")
 }
 
 func (s *standby) joinByAddr(addr string) error {