kubeadm: Allow customizing the image repository via flags

cmd/kubeadm/app/cmd/init.go

@@ -152,11 +152,11 @@ func NewCmdInit(out io.Writer) *cobra.Command {
 	AddInitOtherFlags(cmd.Flags(), &initOptions.cfgPath, &initOptions.skipTokenPrint, &initOptions.dryRun, &initOptions.ignorePreflightErrors)
 	initOptions.bto.AddTokenFlag(cmd.Flags())
 	initOptions.bto.AddTTLFlag(cmd.Flags())
+	options.AddImageMetaFlags(cmd.Flags(), &initOptions.externalcfg.ImageRepository)
 
 	// defines additional flag that are not used by the init command but that could be eventually used
 	// by the sub-commands automatically generated for phases
 	initRunner.SetAdditionalFlags(func(flags *flag.FlagSet) {
-		options.AddImageMetaFlags(flags, &initOptions.externalcfg.ImageRepository)
 		options.AddKubeConfigFlag(flags, &initOptions.kubeconfigPath)
 		options.AddKubeConfigDirFlag(flags, &initOptions.kubeconfigDir)
 		options.AddControlPlanExtraArgsFlags(flags, &initOptions.externalcfg.APIServer.ExtraArgs, &initOptions.externalcfg.ControllerManager.ExtraArgs, &initOptions.externalcfg.Scheduler.ExtraArgs)

cmd/kubeadm/app/cmd/phases/controlplane.go

@@ -98,6 +98,7 @@ func getControlPlanePhaseFlags(name string) []string {
 		options.CfgPath,
 		options.CertificatesDir,
 		options.KubernetesVersion,
+		options.ImageRepository,
 	}
 	if name == "all" || name == kubeadmconstants.KubeAPIServer {
 		flags = append(flags,

cmd/kubeadm/app/cmd/phases/etcd.go

@@ -74,6 +74,7 @@ func getEtcdPhaseFlags() []string {
 	flags := []string{
 		options.CertificatesDir,
 		options.CfgPath,
+		options.ImageRepository,
 	}
 	return flags
 }