Add eviction minimum reclaim option to kubelet

cmd/kubelet/app/options/options.go

@@ -179,5 +179,6 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&s.EvictionSoftGracePeriod, "eviction-soft-grace-period", s.EvictionSoftGracePeriod, "A set of eviction grace periods (e.g. memory.available=1m30s) that correspond to how long a soft eviction threshold must hold before triggering a pod eviction.")
 	fs.DurationVar(&s.EvictionPressureTransitionPeriod.Duration, "eviction-pressure-transition-period", s.EvictionPressureTransitionPeriod.Duration, "Duration for which the kubelet has to wait before transitioning out of an eviction pressure condition.")
 	fs.Int32Var(&s.EvictionMaxPodGracePeriod, "eviction-max-pod-grace-period", s.EvictionMaxPodGracePeriod, "Maximum allowed grace period (in seconds) to use when terminating pods in response to a soft eviction threshold being met.  If negative, defer to pod specified value.")
+	fs.StringVar(&s.EvictionMinimumReclaim, "eviction-minimum-reclaim", s.EvictionMinimumReclaim, "A set of minimum reclaims (e.g. imagefs.available=2Gi) that describes the minimum amount of resource the kubelet will reclaim when performing a pod eviction if that resource is under pressure.")
 	fs.Int32Var(&s.PodsPerCore, "pods-per-core", s.PodsPerCore, "Number of Pods per core that can run on this Kubelet. The total number of Pods on this Kubelet cannot exceed max-pods, so max-pods will be used if this calculation results in a larger number of Pods allowed on the Kubelet. A value of 0 disables this limit.")
 }

pkg/apis/componentconfig/types.go

@@ -378,6 +378,8 @@ type KubeletConfiguration struct {
 	EvictionPressureTransitionPeriod unversioned.Duration `json:"evictionPressureTransitionPeriod,omitempty"`
 	// Maximum allowed grace period (in seconds) to use when terminating pods in response to a soft eviction threshold being met.
 	EvictionMaxPodGracePeriod int32 `json:"evictionMaxPodGracePeriod,omitempty"`
+	// Comma-delimited list of minimum reclaims (e.g. imagefs.available=2Gi) that describes the minimum amount of resource the kubelet will reclaim when performing a pod eviction if that resource is under pressure.
+	EvictionMinimumReclaim string `json:"evictionMinimumReclaim,omitempty"`
 	// Maximum number of pods per core. Cannot exceed MaxPods
 	PodsPerCore int32 `json:"podsPerCore"`
 	// enableControllerAttachDetach enables the Attach/Detach controller to

pkg/apis/componentconfig/v1alpha1/types.go

@@ -433,6 +433,8 @@ type KubeletConfiguration struct {
 	EvictionPressureTransitionPeriod unversioned.Duration `json:"evictionPressureTransitionPeriod"`
 	// Maximum allowed grace period (in seconds) to use when terminating pods in response to a soft eviction threshold being met.
 	EvictionMaxPodGracePeriod int32 `json:"evictionMaxPodGracePeriod"`
+	// Comma-delimited list of minimum reclaims (e.g. imagefs.available=2Gi) that describes the minimum amount of resource the kubelet will reclaim when performing a pod eviction if that resource is under pressure.
+	EvictionMinimumReclaim string `json:"evictionMinimumReclaim"`
 	// Maximum number of pods per core. Cannot exceed MaxPods
 	PodsPerCore int32 `json:"podsPerCore"`
 	// enableControllerAttachDetach enables the Attach/Detach controller to