code: func CreateKubeConfigFile(kubeConfigFileName string, outDir string, cfg *kubeadmapi.InitConfiguration) error {
  	klog.V(1).Infof("creating kubeconfig file for %s", kubeConfigFileName)
  	return createKubeConfigFiles(outDir, cfg, kubeConfigFileName)
  }
docs: // CreateKubeConfigFile creates a kubeconfig file.
  // If the kubeconfig file already exists, it is used only if evaluated equal; otherwise an error is returned.