cmd := &cobra.Command{
		Use:   "upgrade",
		Short: "Upgrade your cluster smoothly to a newer version with this command",
		Run:   cmdutil.SubCmdRun(),
	}

	cmd.AddCommand(newCmdApply(flags))
	cmd.AddCommand(newCmdPlan(flags))
	cmd.AddCommand(newCmdDiff(out))
	cmd.AddCommand(newCmdNode(out))
	return cmd
}

func addApplyPlanFlags(fs *pflag.FlagSet, flags *applyPlanFlags) {
	options.AddKubeConfigFlag(fs, &flags.kubeConfigPath)

	This command can only run on the control plane nodes where the kubeconfig file "admin.conf" exists.
	To skip the internet check, pass in the optional [version] parameter.
`)

// newCmdPlan returns the cobra command for `kubeadm upgrade plan`
func newCmdPlan(apf *applyPlanFlags) *cobra.Command {
	flags := &planFlags{
		applyPlanFlags: apf,
	}