support multiple masters

fix https://github.com/seaweedfs/seaweedfs/issues/6988

weed/admin/dash/admin_data.go

@@ -187,10 +187,13 @@ func (s *AdminServer) getMasterNodesStatus() []MasterNode {
 		isLeader = false
 	}
 
-	masterNodes = append(masterNodes, MasterNode{
-		Address:  s.masterAddress,
-		IsLeader: isLeader,
-	})
+	currentMaster := s.masterClient.GetMaster(context.Background())
+	if currentMaster != "" {
+		masterNodes = append(masterNodes, MasterNode{
+			Address:  string(currentMaster),
+			IsLeader: isLeader,
+		})
+	}
 
 	return masterNodes
 }
@@ -222,7 +225,8 @@ func (s *AdminServer) getFilerNodesStatus() []FilerNode {
 	})
 
 	if err != nil {
-		glog.Errorf("Failed to get filer nodes from master %s: %v", s.masterAddress, err)
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		glog.Errorf("Failed to get filer nodes from master %s: %v", currentMaster, err)
 		// Return empty list if we can't get filer info from master
 		return []FilerNode{}
 	}
@@ -257,7 +261,8 @@ func (s *AdminServer) getMessageBrokerNodesStatus() []MessageBrokerNode {
 	})
 
 	if err != nil {
-		glog.Errorf("Failed to get message broker nodes from master %s: %v", s.masterAddress, err)
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		glog.Errorf("Failed to get message broker nodes from master %s: %v", currentMaster, err)
 		// Return empty list if we can't get broker info from master
 		return []MessageBrokerNode{}
 	}

weed/admin/dash/admin_server.go

@@ -14,6 +14,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/credential"
 	"github.com/seaweedfs/seaweedfs/weed/filer"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/iam_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
@@ -21,11 +22,12 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
 	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/util"
+	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	"google.golang.org/grpc"
 )
 
 type AdminServer struct {
-	masterAddress   string
+	masterClient    *wdclient.MasterClient
 	templateFS      http.FileSystem
 	dataDir         string
 	grpcDialOption  grpc.DialOption
@@ -56,12 +58,29 @@ type AdminServer struct {
 
 // Type definitions moved to types.go
 
-func NewAdminServer(masterAddress string, templateFS http.FileSystem, dataDir string) *AdminServer {
+func NewAdminServer(masters string, templateFS http.FileSystem, dataDir string) *AdminServer {
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	// Create master client with multiple master support
+	masterClient := wdclient.NewMasterClient(
+		grpcDialOption,
+		"",      // filerGroup - not needed for admin
+		"admin", // clientType
+		"",      // clientHost - not needed for admin
+		"",      // dataCenter - not needed for admin
+		"",      // rack - not needed for admin
+		*pb.ServerAddresses(masters).ToServiceDiscovery(),
+	)
+
+	// Start master client connection process (like shell and filer do)
+	ctx := context.Background()
+	go masterClient.KeepConnectedToMaster(ctx)
+
 	server := &AdminServer{
-		masterAddress:        masterAddress,
+		masterClient:         masterClient,
 		templateFS:           templateFS,
 		dataDir:              dataDir,
-		grpcDialOption:       security.LoadClientTLS(util.GetViper(), "grpc.client"),
+		grpcDialOption:       grpcDialOption,
 		cacheExpiration:      10 * time.Second,
 		filerCacheExpiration: 30 * time.Second, // Cache filers for 30 seconds
 		configPersistence:    NewConfigPersistence(dataDir),
@@ -606,7 +625,8 @@ func (s *AdminServer) GetClusterMasters() (*ClusterMastersData, error) {
 
 	if err != nil {
 		// If gRPC call fails, log the error but continue with topology data
-		glog.Errorf("Failed to get raft cluster servers from master %s: %v", s.masterAddress, err)
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		glog.Errorf("Failed to get raft cluster servers from master %s: %v", currentMaster, err)
 	}
 
 	// Convert map to slice
@@ -614,14 +634,17 @@ func (s *AdminServer) GetClusterMasters() (*ClusterMastersData, error) {
 		masters = append(masters, *masterInfo)
 	}
 
-	// If no masters found at all, add the configured master as fallback
+	// If no masters found at all, add the current master as fallback
 	if len(masters) == 0 {
-		masters = append(masters, MasterInfo{
-			Address:  s.masterAddress,
-			IsLeader: true,
-			Suffrage: "Voter",
-		})
-		leaderCount = 1
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		if currentMaster != "" {
+			masters = append(masters, MasterInfo{
+				Address:  string(currentMaster),
+				IsLeader: true,
+				Suffrage: "Voter",
+			})
+			leaderCount = 1
+		}
 	}
 
 	return &ClusterMastersData{
@@ -1188,7 +1211,8 @@ func (as *AdminServer) GetConfigInfo(c *gin.Context) {
 	configInfo := as.configPersistence.GetConfigInfo()
 
 	// Add additional admin server info
-	configInfo["master_address"] = as.masterAddress
+	currentMaster := as.masterClient.GetMaster(context.Background())
+	configInfo["master_address"] = string(currentMaster)
 	configInfo["cache_expiration"] = as.cacheExpiration.String()
 	configInfo["filer_cache_expiration"] = as.filerCacheExpiration.String()
 

weed/admin/dash/client_management.go

@@ -16,11 +16,7 @@ import (
 
 // WithMasterClient executes a function with a master client connection
 func (s *AdminServer) WithMasterClient(f func(client master_pb.SeaweedClient) error) error {
-	masterAddr := pb.ServerAddress(s.masterAddress)
-
-	return pb.WithMasterClient(false, masterAddr, s.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
-		return f(client)
-	})
+	return s.masterClient.WithClient(false, f)
 }
 
 // WithFilerClient executes a function with a filer client connection
@@ -78,7 +74,8 @@ func (s *AdminServer) getDiscoveredFilers() []string {
 	})
 
 	if err != nil {
-		glog.Warningf("Failed to discover filers from master %s: %v", s.masterAddress, err)
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		glog.Warningf("Failed to discover filers from master %s: %v", currentMaster, err)
 		// Return cached filers even if expired, better than nothing
 		return s.cachedFilers
 	}

weed/admin/dash/cluster_topology.go

@@ -23,7 +23,8 @@ func (s *AdminServer) GetClusterTopology() (*ClusterTopology, error) {
 	// Use gRPC only
 	err := s.getTopologyViaGRPC(topology)
 	if err != nil {
-		glog.Errorf("Failed to connect to master server %s: %v", s.masterAddress, err)
+		currentMaster := s.masterClient.GetMaster(context.Background())
+		glog.Errorf("Failed to connect to master server %s: %v", currentMaster, err)
 		return nil, fmt.Errorf("gRPC topology request failed: %v", err)
 	}
 
@@ -40,7 +41,8 @@ func (s *AdminServer) getTopologyViaGRPC(topology *ClusterTopology) error {
 	err := s.WithMasterClient(func(client master_pb.SeaweedClient) error {
 		resp, err := client.VolumeList(context.Background(), &master_pb.VolumeListRequest{})
 		if err != nil {
-			glog.Errorf("Failed to get volume list from master %s: %v", s.masterAddress, err)
+			currentMaster := s.masterClient.GetMaster(context.Background())
+			glog.Errorf("Failed to get volume list from master %s: %v", currentMaster, err)
 			return err
 		}
 

weed/command/admin.go

@@ -22,6 +22,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/admin"
 	"github.com/seaweedfs/seaweedfs/weed/admin/dash"
 	"github.com/seaweedfs/seaweedfs/weed/admin/handlers"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
@@ -119,6 +120,14 @@ func runAdmin(cmd *Command, args []string) bool {
 		return false
 	}
 
+	// Validate that masters string can be parsed
+	masterAddresses := pb.ServerAddresses(*a.masters).ToAddresses()
+	if len(masterAddresses) == 0 {
+		fmt.Println("Error: no valid master addresses found")
+		fmt.Println("Usage: weed admin -masters=master1:9333,master2:9333")
+		return false
+	}
+
 	// Security warnings
 	if *a.adminPassword == "" {
 		fmt.Println("WARNING: Admin interface is running without authentication!")
@@ -153,7 +162,7 @@ func runAdmin(cmd *Command, args []string) bool {
 		cancel()
 	}()
 
-	// Start the admin server
+	// Start the admin server with all masters
 	err := startAdminServer(ctx, a)
 	if err != nil {
 		fmt.Printf("Admin server error: %v\n", err)