return errors.Errorf("can not mix '--config' with arguments %v", mixedInvalidFlags)
	}
	return nil
}

func isAllowedFlag(flagName string) bool {
	allowedFlags := sets.New(kubeadmcmdoptions.CfgPath,
		kubeadmcmdoptions.IgnorePreflightErrors,
		kubeadmcmdoptions.DryRun,
		kubeadmcmdoptions.KubeconfigPath,
		kubeadmcmdoptions.NodeName,
		kubeadmcmdoptions.KubeconfigDir,
		kubeadmcmdoptions.UploadCerts,