klog.V(1).Infoln("[bootstrap-token] loading admin kubeconfig")
	adminConfig, err := clientcmd.LoadFromFile(file)
	if err != nil {
		return errors.Wrap(err, "failed to load admin kubeconfig")
	}
	if err = clientcmdapi.FlattenConfig(adminConfig); err != nil {
		return err
	}

	adminCluster := adminConfig.Contexts[adminConfig.CurrentContext].Cluster