kubeadm: add missing --config flag to mark-control-plane phase

cmd/kubeadm/app/cmd/options/constant.go

@@ -31,7 +31,7 @@ const APIServerExtraArgs = "apiserver-extra-args"
 // CertificatesDir flag sets the path where to save and read the certificates.
 const CertificatesDir = "cert-dir"
 
-// CfgPath flag sets the path to kubeadm config file. WARNING: Usage of a configuration file is experimental.
+// CfgPath flag sets the path to kubeadm config file.
 const CfgPath = "config"
 
 // ControllerManagerExtraArgs flag sets extra flags to pass to the Controller Manager or override default ones in form of <flagname>=<value>.

cmd/kubeadm/app/cmd/options/generic.go

@@ -33,7 +33,7 @@ func AddKubeConfigDirFlag(fs *pflag.FlagSet, kubeConfigDir *string) {
 
 // AddConfigFlag adds the --config flag to the given flagset
 func AddConfigFlag(fs *pflag.FlagSet, cfgPath *string) {
-	fs.StringVar(cfgPath, CfgPath, *cfgPath, "Path to kubeadm config file (WARNING: Usage of a configuration file is experimental).")
+	fs.StringVar(cfgPath, CfgPath, *cfgPath, "Path to a kubeadm configuration file.")
 }
 
 // AddIgnorePreflightErrorsFlag adds the --ignore-preflight-errors flag to the given flagset

cmd/kubeadm/app/cmd/phases/markcontrolplane.go

@@ -50,6 +50,7 @@ func NewMarkControlPlanePhase() workflow.Phase {
 		Example: markControlPlaneExample,
 		InheritFlags: []string{
 			options.NodeName,
+			options.CfgPath,
 		},
 		Run: runMarkControlPlane,
 	}