etcdserver: Check the initial cluster settings after checking if the WAL exists

etcdserver/config.go

@@ -27,7 +27,6 @@ import (
 
 // ServerConfig holds the configuration of etcd as taken from the command line or discovery.
 type ServerConfig struct {
-	NodeID       uint64
 	Name         string
 	DiscoveryURL string
 	ClientURLs   types.URLs
@@ -41,7 +40,12 @@ type ServerConfig struct {
 // VerifyBootstrapConfig sanity-checks the initial config and returns an error
 // for things that should never happen.
 func (c *ServerConfig) VerifyBootstrapConfig() error {
-	if c.NodeID == raft.None {
+	m := c.Cluster.FindName(c.Name)
+	// Make sure the cluster at least contains the local server.
+	if m == nil {
+		return fmt.Errorf("couldn't find local name %s in the initial cluster configuration", c.Name)
+	}
+	if m.ID == raft.None {
 		return fmt.Errorf("could not use %x as member id", raft.None)
 	}
 
@@ -49,12 +53,6 @@ func (c *ServerConfig) VerifyBootstrapConfig() error {
 		return fmt.Errorf("initial cluster state unset and no wal or discovery URL found")
 	}
 
-	// Make sure the cluster at least contains the local server.
-	m := c.Cluster.FindID(c.NodeID)
-	if m == nil {
-		return fmt.Errorf("couldn't find local ID in cluster config")
-	}
-
 	// No identical IPs in the cluster peer list
 	urlMap := make(map[string]bool)
 	for _, m := range c.Cluster.Members() {

etcdserver/config_test.go

@@ -51,7 +51,7 @@ func TestBootstrapConfigVerify(t *testing.T) {
 		}
 
 		cfg := ServerConfig{
-			NodeID:       0x7350a9cd4dc16f76,
+			Name:         "node1",
 			DiscoveryURL: tt.disc,
 			Cluster:      cluster,
 			ClusterState: tt.clst,

etcdserver/server.go

@@ -181,8 +181,9 @@ func NewServer(cfg *ServerConfig) *EtcdServer {
 		if err := cfg.VerifyBootstrapConfig(); err != nil {
 			log.Fatalf("etcdserver: %v", err)
 		}
+		m := cfg.Cluster.FindName(cfg.Name)
 		if cfg.ShouldDiscover() {
-			d, err := discovery.New(cfg.DiscoveryURL, cfg.NodeID, cfg.Cluster.String())
+			d, err := discovery.New(cfg.DiscoveryURL, m.ID, cfg.Cluster.String())
 			if err != nil {
 				log.Fatalf("etcdserver: cannot init discovery %v", err)
 			}
@@ -216,9 +217,9 @@ func NewServer(cfg *ServerConfig) *EtcdServer {
 
 	sstats := &stats.ServerStats{
 		Name: cfg.Name,
-		ID:   idAsHex(cfg.NodeID),
+		ID:   idAsHex(id),
 	}
-	lstats := stats.NewLeaderStats(idAsHex(cfg.NodeID))
+	lstats := stats.NewLeaderStats(idAsHex(id))
 
 	s := &EtcdServer{
 		store:      st,
@@ -647,8 +648,9 @@ func startNode(cfg *ServerConfig) (id, cid uint64, n raft.Node, w *wal.WAL) {
 	var err error
 	// TODO: remove the discoveryURL when it becomes part of the source for
 	// generating nodeID.
+	member := cfg.Cluster.FindName(cfg.Name)
 	cfg.Cluster.GenID([]byte(cfg.DiscoveryURL))
-	metadata := pbutil.MustMarshal(&pb.Metadata{NodeID: cfg.NodeID, ClusterID: cfg.Cluster.ID()})
+	metadata := pbutil.MustMarshal(&pb.Metadata{NodeID: member.ID, ClusterID: cfg.Cluster.ID()})
 	if w, err = wal.Create(cfg.WALDir(), metadata); err != nil {
 		log.Fatal(err)
 	}
@@ -661,9 +663,9 @@ func startNode(cfg *ServerConfig) (id, cid uint64, n raft.Node, w *wal.WAL) {
 		}
 		peers[i] = raft.Peer{ID: id, Context: ctx}
 	}
-	id, cid = cfg.NodeID, cfg.Cluster.ID()
+	id, cid = member.ID, cfg.Cluster.ID()
 	log.Printf("etcdserver: start node %d in cluster %d", id, cid)
-	n = raft.StartNode(cfg.NodeID, peers, 10, 1)
+	n = raft.StartNode(member.ID, peers, 10, 1)
 	return
 }
 

integration/cluster_test.go

@@ -105,7 +105,6 @@ func (c *cluster) Launch(t *testing.T) {
 		m.PeerListeners = []net.Listener{lns[i]}
 		cln := newLocalListener(t)
 		m.ClientListeners = []net.Listener{cln}
-		m.NodeID = clusterCfg.FindName(c.name(i)).ID
 		m.Name = c.name(i)
 		m.ClientURLs, err = types.NewURLs([]string{"http://" + cln.Addr().String()})
 		if err != nil {

main.go

@@ -141,8 +141,7 @@ func main() {
 
 // startEtcd launches the etcd server and HTTP handlers for client/server communication.
 func startEtcd() {
-	self, err := setupCluster()
+	if err := setupCluster(); err != nil {
-	if err != nil {
 		log.Fatalf("etcd: setupCluster returned error %v", err)
 	}
 
@@ -164,7 +163,6 @@ func startEtcd() {
 		log.Fatal(err.Error())
 	}
 	cfg := &etcdserver.ServerConfig{
-		NodeID:       self.ID,
 		Name:         *name,
 		ClientURLs:   acurls,
 		DataDir:      *dir,
@@ -262,37 +260,32 @@ func startProxy() {
 	}
 }
 
-// setupCluster sets cluster to a temporary value if you are using
+// setupCluster sets up the cluster definition for bootstrap or discovery.
-// discovery, or to the static configuration for bootstrapped clusters.
+func setupCluster() error {
-// Returns the local member on success.
-func setupCluster() (*etcdserver.Member, error) {
 	cluster = etcdserver.NewCluster(*initialClusterName)
 	set := make(map[string]bool)
 	flag.Visit(func(f *flag.Flag) {
 		set[f.Name] = true
 	})
 	if set["discovery"] && set["initial-cluster"] {
-		return nil, fmt.Errorf("both discovery and bootstrap-config are set")
+		return fmt.Errorf("both discovery and bootstrap-config are set")
 	}
 	apurls, err := pkg.URLsFromFlags(fs, "advertise-peer-urls", "addr", peerTLSInfo)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	switch {
 	case set["discovery"]:
 		cluster = etcdserver.NewCluster(*durl)
-		return cluster.AddMemberFromURLs(*name, apurls)
+		_, err := cluster.AddMemberFromURLs(*name, apurls)
+		return err
 	case set["initial-cluster"]:
 		fallthrough
 	default:
 		// We're statically configured, and cluster has appropriately been set.
 		// Try to configure by indexing the static cluster by name.
 		cluster.SetMembersFromString(*initialCluster)
-		m := cluster.FindName(*name)
-		if m != nil {
-			return m, nil
-		}
-		return nil, fmt.Errorf("cannot find the passed name %s in --initial-cluster bootstrap list.", *name)
 	}
+	return nil
 }