skip pinging self for master and volume server

weed/shell/command_cluster_check.go

@@ -99,6 +99,9 @@ func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer i
 	// check between masters
 	for _, sourceMaster := range masters {
 		for _, targetMaster := range masters {
+			if sourceMaster == targetMaster {
+				continue
+			}
 			fmt.Fprintf(writer, "checking master %s to %s ... ", string(sourceMaster), string(targetMaster))
 			err := pb.WithMasterClient(false, sourceMaster, commandEnv.option.GrpcDialOption, func(client master_pb.SeaweedClient) error {
 				_, err := client.Ping(context.Background(), &master_pb.PingRequest{
@@ -175,6 +178,9 @@ func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer i
 	// check between volume servers
 	for _, sourceVolumeServer := range volumeServers {
 		for _, targetVolumeServer := range volumeServers {
+			if sourceVolumeServer == targetVolumeServer {
+				continue
+			}
 			fmt.Fprintf(writer, "checking volume server %s to %s ... ", string(sourceVolumeServer), string(targetVolumeServer))
 			err := pb.WithVolumeServerClient(false, sourceVolumeServer, commandEnv.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 				_, err := client.Ping(context.Background(), &volume_server_pb.PingRequest{
@@ -191,12 +197,9 @@ func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer i
 		}
 	}
 
-	// check between filers
+	// check between filers, and need to connect to itself
 	for _, sourceFiler := range filers {
 		for _, targetFiler := range filers {
-			if sourceFiler == targetFiler {
-				continue
-			}
 			fmt.Fprintf(writer, "checking filer %s to %s ... ", string(sourceFiler), string(targetFiler))
 			err := pb.WithFilerClient(false, sourceFiler, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 				_, err := client.Ping(context.Background(), &filer_pb.PingRequest{