Remove clusterName flag, just use config file

cmd/kubeadm/app/apis/kubeadm/fuzzer/fuzzer.go

@@ -55,7 +55,7 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
 			obj.CIImageRepository = ""
 			obj.UnifiedControlPlaneImage = "foo"
 			obj.FeatureGates = map[string]bool{"foo": true}
-			obj.ClusterName = "kubernetes"
+			obj.ClusterName = "foo"
 			obj.APIServerExtraArgs = map[string]string{"foo": "foo"}
 			obj.APIServerExtraVolumes = []kubeadm.HostPathMount{{
 				Name:      "foo",
@@ -133,7 +133,7 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
 			obj.TLSBootstrapToken = "foo"
 			obj.Token = "foo"
 			obj.CRISocket = "foo"
-			obj.ClusterName = "kubernetes"
+			obj.ClusterName = "foo"
 		},
 	}
 }

cmd/kubeadm/app/cmd/init.go

@@ -186,10 +186,6 @@ func AddInitConfigFlags(flagSet *flag.FlagSet, cfg *kubeadmapiext.MasterConfigur
 		`Specify the node name.`,
 	)
 	flagSet.StringVar(
-		&cfg.ClusterName, "cluster-name", cfg.ClusterName,
-		`Specify the cluster name`,
-	)
-	flagSet.StringVar(
 		&cfg.Token, "token", cfg.Token,
 		"The token to use for establishing bidirectional trust between nodes and masters.",
 	)

cmd/kubeadm/app/cmd/join.go

@@ -154,9 +154,6 @@ func AddJoinConfigFlags(flagSet *flag.FlagSet, cfg *kubeadmapiext.NodeConfigurat
 		&cfg.NodeName, "node-name", "",
 		"Specify the node name.")
 	flagSet.StringVar(
-		&cfg.ClusterName, "cluster-name", cfg.ClusterName,
-		"Specify the cluster name.")
-	flagSet.StringVar(
 		&cfg.TLSBootstrapToken, "tls-bootstrap-token", "",
 		"A token used for TLS bootstrapping.")
 	flagSet.StringSliceVar(

cmd/kubeadm/app/cmd/phases/kubeconfig.go

@@ -189,7 +189,6 @@ func getKubeConfigSubCommands(out io.Writer, outDir, defaultKubernetesVersion st
 			cmd.Flags().StringVar(&token, "token", token, "The token that should be used as the authentication mechanism for this kubeconfig (instead of client certificates)")
 			cmd.Flags().StringVar(&clientName, "client-name", clientName, "The name of user. It will be used as the CN if client certificates are created")
 		}
-		cmd.Flags().StringVar(&cfg.ClusterName, "cluster-name", cfg.ClusterName, "Specify the cluster name.")
 
 		subCmds = append(subCmds, cmd)
 	}