Davanum Srinivas <******@****.***> 1706190440 -0500

			cfg: &kubeadmapi.ClusterConfiguration{
				ControllerManager: kubeadmapi.ControlPlaneComponent{
					ExtraArgs: []kubeadmapi.Arg{},
				},
			},
			expected: "127.0.0.1",
		},
		{
			desc: "setting controller manager extra address arg to something acknowledges it",
			cfg: &kubeadmapi.ClusterConfiguration{
				ControllerManager: kubeadmapi.ControlPlaneComponent{
					ExtraArgs: []kubeadmapi.Arg{

	// Flexvolume dir must NOT be readonly as it is used for third-party plugins to integrate with their storage backends via unix domain socket.
	flexvolumeDirVolumePath, idx := kubeadmapi.GetArgValue(cfg.ControllerManager.ExtraArgs, "flex-volume-plugin-dir", -1)
	if idx == -1 {
		flexvolumeDirVolumePath = defaultFlexvolumeDirVolumePath
	}

//
//   - TODO https://github.com/kubernetes/kubeadm/issues/2890
//   - Support custom environment variables in control plane components under `ClusterConfiguration`.
//     Use `APIServer.ExtraEnvs`, `ControllerManager.ExtraEnvs`, `Scheduler.ExtraEnvs`, `Etcd.Local.ExtraEnvs`.
//   - The ResetConfiguration API type is now supported in v1beta4. Users are able to reset a node by passing a --config file to "kubeadm reset".

			cfg: &kubeadmapi.ClusterConfiguration{
				ControllerManager: kubeadmapi.ControlPlaneComponent{
					ExtraArgs: []kubeadmapi.Arg{
						{Name: "node-cidr-mask-size-ipv6", Value: "83"},
					},
				},
			},
			isIPv6:       true,
			expectedMask: 83,
		},
		{
			name: "dual ipv4 custom mask",
			cfg: &kubeadmapi.ClusterConfiguration{
				ControllerManager: kubeadmapi.ControlPlaneComponent{

	}{
		yaml: dedent.Dedent(fmt.Sprintf(`
			apiServer:
			  timeoutForControlPlane: 4m
			apiVersion: %s
			certificatesDir: /etc/kubernetes/pki
			clusterName: LeCluster
			controllerManager: {}
			etcd:
			  local:
			    dataDir: /var/lib/etcd
			imageRepository: registry.k8s.io
			kind: ClusterConfiguration
			kubernetesVersion: 1.2.3
			networking:
			  dnsDomain: cluster.local

	if err := Convert_v1beta3_APIServer_To_kubeadm_APIServer(&in.APIServer, &out.APIServer, s); err != nil {
		return err
	}
	if err := Convert_v1beta3_ControlPlaneComponent_To_kubeadm_ControlPlaneComponent(&in.ControllerManager, &out.ControllerManager, s); err != nil {
		return err
	}
	if err := Convert_v1beta3_ControlPlaneComponent_To_kubeadm_ControlPlaneComponent(&in.Scheduler, &out.Scheduler, s); err != nil {
		return err
	}

	// +optional
	APIServer APIServer `json:"apiServer,omitempty"`

	// ControllerManager contains extra settings for the controller manager control plane component
	// +optional
	ControllerManager ControlPlaneComponent `json:"controllerManager,omitempty"`

	// Scheduler contains extra settings for the scheduler control plane component
	// +optional

	allErrs = append(allErrs, ValidateAPIServer(&c.APIServer, field.NewPath("apiServer"))...)
	allErrs = append(allErrs, ValidateControllerManager(&c.ControllerManager, field.NewPath("controllerManager"))...)
	allErrs = append(allErrs, ValidateScheduler(&c.Scheduler, field.NewPath("scheduler"))...)
	allErrs = append(allErrs, ValidateAbsolutePath(c.CertificatesDir, field.NewPath("certificatesDir"))...)

			Resources:       staticpodutil.ComponentResources("200m"),
			Env:             kubeadmutil.MergeKubeadmEnvVars(proxyEnvs, cfg.ControllerManager.ExtraEnvs),
		}, mounts.GetVolumes(kubeadmconstants.KubeControllerManager), nil),
		kubeadmconstants.KubeScheduler: staticpodutil.ComponentPod(v1.Container{
			Name:            kubeadmconstants.KubeScheduler,