Promote RotateKubeletClientCertificate to GA

Author: liggitt

cmd/kubelet/app/server.go

@@ -806,7 +806,7 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.Dependencies, featureGate f
 // buildKubeletClientConfig constructs the appropriate client config for the kubelet depending on whether
 // bootstrapping is enabled or client certificate rotation is enabled.
 func buildKubeletClientConfig(s *options.KubeletServer, nodeName types.NodeName) (*restclient.Config, func(), error) {
-	if s.RotateCertificates && utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletClientCertificate) {
+	if s.RotateCertificates {
 		// Rules for client rotation and the handling of kube config files:
 		//
 		// 1. If the client provides only a kubeconfig file, we must use that as the initial client

pkg/features/kube_features.go

@@ -78,6 +78,7 @@ const (
 
 	// owner: @mikedanese
 	// beta: v1.8
+	// ga: v1.19
 	//
 	// Automatically renews the client certificate used for communicating with
 	// the API server as the certificate approaches expiration.
@@ -593,7 +594,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	DevicePlugins:                  {Default: true, PreRelease: featuregate.Beta},
 	TaintBasedEvictions:            {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.19
 	RotateKubeletServerCertificate: {Default: true, PreRelease: featuregate.Beta},
-	RotateKubeletClientCertificate: {Default: true, PreRelease: featuregate.Beta},
+	RotateKubeletClientCertificate: {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.20
 	LocalStorageCapacityIsolation:  {Default: true, PreRelease: featuregate.Beta},
 	Sysctls:                        {Default: true, PreRelease: featuregate.Beta},
 	EphemeralContainers:            {Default: false, PreRelease: featuregate.Alpha},

pkg/kubelet/apis/config/types.go

@@ -122,8 +122,7 @@ type KubeletConfiguration struct {
 	TLSMinVersion string
 	// rotateCertificates enables client certificate rotation. The Kubelet will request a
 	// new certificate from the certificates.k8s.io API. This requires an approver to approve the
-	// certificate signing requests. The RotateKubeletClientCertificate feature
-	// must be enabled.
+	// certificate signing requests.
 	RotateCertificates bool
 	// serverTLSBootstrap enables server certificate bootstrap. Instead of self
 	// signing a serving certificate, the Kubelet will request a certificate from

pkg/kubelet/apis/config/validation/validation.go

@@ -110,9 +110,6 @@ func ValidateKubeletConfiguration(kc *kubeletconfig.KubeletConfiguration) error
 	if kc.RegistryPullQPS < 0 {
 		allErrors = append(allErrors, fmt.Errorf("invalid configuration: RegistryPullQPS (--registry-qps) %v must not be a negative number", kc.RegistryPullQPS))
 	}
-	if kc.RotateCertificates && !localFeatureGate.Enabled(features.RotateKubeletClientCertificate) {
-		allErrors = append(allErrors, fmt.Errorf("invalid configuration: RotateCertificates %v requires feature gate RotateKubeletClientCertificate", kc.RotateCertificates))
-	}
 	if kc.ServerTLSBootstrap && !localFeatureGate.Enabled(features.RotateKubeletServerCertificate) {
 		allErrors = append(allErrors, fmt.Errorf("invalid configuration: ServerTLSBootstrap %v requires feature gate RotateKubeletServerCertificate", kc.ServerTLSBootstrap))
 	}

staging/src/k8s.io/kubelet/config/v1beta1/types.go

@@ -177,8 +177,7 @@ type KubeletConfiguration struct {
 	TLSMinVersion string `json:"tlsMinVersion,omitempty"`
 	// rotateCertificates enables client certificate rotation. The Kubelet will request a
 	// new certificate from the certificates.k8s.io API. This requires an approver to approve the
-	// certificate signing requests. The RotateKubeletClientCertificate feature
-	// must be enabled.
+	// certificate signing requests.
 	// Dynamic Kubelet Config (beta): If dynamically updating this field, consider that
 	// disabling it may disrupt the Kubelet's ability to authenticate with the API server
 	// after the current certificate expires.