use feature gate instead of flag to control support for GPUs

cmd/kubelet/app/options/options.go

@@ -206,7 +206,6 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&s.BabysitDaemons, "babysit-daemons", s.BabysitDaemons, "If true, the node has babysitter process monitoring docker and kubelet.")
 	fs.MarkDeprecated("babysit-daemons", "Will be removed in a future version.")
 	fs.Int32Var(&s.MaxPods, "max-pods", s.MaxPods, "Number of Pods that can run on this Kubelet.")
-	fs.BoolVar(&s.ExperimentalEnableNvidiaGPU, "experimental-enable-nvidia-gpu", s.ExperimentalEnableNvidiaGPU, "Enable experimental Nvidia GPU support.")
 	// TODO(#40229): Remove the docker-exec-handler flag.
 	fs.StringVar(&s.DockerExecHandlerName, "docker-exec-handler", s.DockerExecHandlerName, "Handler to use when executing a command in a container. Valid values are 'native' and 'nsenter'. Defaults to 'native'.")
 	fs.MarkDeprecated("docker-exec-handler", "this flag will be removed and only the 'native' handler will be supported in the future.")

pkg/apis/componentconfig/types.go

@@ -362,8 +362,6 @@ type KubeletConfiguration struct {
 	BabysitDaemons bool
 	// maxPods is the number of pods that can run on this Kubelet.
 	MaxPods int32
-	// Enable experimental Nvidia GPU
-	ExperimentalEnableNvidiaGPU bool
 	// dockerExecHandlerName is the handler to use when executing a command
 	// in a container. Valid values are 'native' and 'nsenter'. Defaults to
 	// 'native'.

pkg/apis/componentconfig/v1alpha1/types.go

@@ -407,8 +407,6 @@ type KubeletConfiguration struct {
 	BabysitDaemons bool `json:"babysitDaemons"`
 	// maxPods is the number of pods that can run on this Kubelet.
 	MaxPods int32 `json:"maxPods"`
-	// Enable Nvidia GPU support on this node.
-	ExperimentalEnableNvidiaGPU bool `json:"experimentalEnableNvidiaGPU"`
 	// dockerExecHandlerName is the handler to use when executing a command
 	// in a container. Valid values are 'native' and 'nsenter'. Defaults to
 	// 'native'.

pkg/apis/componentconfig/v1alpha1/zz_generated.conversion.go

@@ -353,7 +353,6 @@ func autoConvert_v1alpha1_KubeletConfiguration_To_componentconfig_KubeletConfigu
 	out.HairpinMode = in.HairpinMode
 	out.BabysitDaemons = in.BabysitDaemons
 	out.MaxPods = in.MaxPods
-	out.ExperimentalEnableNvidiaGPU = in.ExperimentalEnableNvidiaGPU
 	out.DockerExecHandlerName = in.DockerExecHandlerName
 	out.PodCIDR = in.PodCIDR
 	out.ResolverConfig = in.ResolverConfig
@@ -531,7 +530,6 @@ func autoConvert_componentconfig_KubeletConfiguration_To_v1alpha1_KubeletConfigu
 	out.HairpinMode = in.HairpinMode
 	out.BabysitDaemons = in.BabysitDaemons
 	out.MaxPods = in.MaxPods
-	out.ExperimentalEnableNvidiaGPU = in.ExperimentalEnableNvidiaGPU
 	out.DockerExecHandlerName = in.DockerExecHandlerName
 	out.PodCIDR = in.PodCIDR
 	out.ResolverConfig = in.ResolverConfig

pkg/features/kube_features.go

@@ -73,6 +73,13 @@ const (
 	// Determines if affinity defined in annotations should be processed
 	// TODO: remove when alpha support for affinity is removed
 	AffinityInAnnotations utilfeature.Feature = "AffinityInAnnotations"
+
+	// owner: @vishh
+	// alpha: v1.6
+	//
+	// Enables support for GPUs as a schedulable resource.
+	// Only Nvidia GPUs are supported as of v1.6
+	Accelerators utilfeature.Feature = "Accelerators"
 )
 
 func init() {
@@ -90,6 +97,7 @@ var defaultKubernetesFeatureGates = map[utilfeature.Feature]utilfeature.FeatureS
 	ExperimentalHostUserNamespaceDefaultingGate: {Default: false, PreRelease: utilfeature.Beta},
 	ExperimentalCriticalPodAnnotation:           {Default: false, PreRelease: utilfeature.Alpha},
 	AffinityInAnnotations:                       {Default: false, PreRelease: utilfeature.Alpha},
+	Accelerators:                                {Default: false, PreRelease: utilfeature.Alpha},
 
 	// inherited features from generic apiserver, relisted here to get a conflict if it is changed
 	// unintentionally on either side:

pkg/kubelet/kubelet.go

@@ -787,7 +787,7 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 
 	klet.appArmorValidator = apparmor.NewValidator(kubeCfg.ContainerRuntime)
 	klet.softAdmitHandlers.AddPodAdmitHandler(lifecycle.NewAppArmorAdmitHandler(klet.appArmorValidator))
-	if kubeCfg.ExperimentalEnableNvidiaGPU {
+	if utilfeature.DefaultFeatureGate.Enabled(features.Accelerators) {
 		klet.gpuManager = nvidia.NewNvidiaGPUManager(klet, klet.dockerClient)
 	} else {
 		klet.gpuManager = gpu.NewGPUManagerStub()