adding kubelet flags for node allocatable phase 2

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

cmd/kubelet/app/options/options.go

@@ -225,8 +225,7 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.Float64Var(&s.ChaosChance, "chaos-chance", s.ChaosChance, "If > 0.0, introduce random client errors and latency. Intended for testing. [default=0.0]")
 	fs.BoolVar(&s.Containerized, "containerized", s.Containerized, "Experimental support for running kubelet in a container.  Intended for testing. [default=false]")
 	fs.Int64Var(&s.MaxOpenFiles, "max-open-files", s.MaxOpenFiles, "Number of files that can be opened by Kubelet process. [default=1000000]")
-	fs.Var(&s.SystemReserved, "system-reserved", "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for non-kubernetes components. Currently only cpu and memory are supported. See http://kubernetes.io/docs/user-guide/compute-resources for more detail. [default=none]")
-	fs.Var(&s.KubeReserved, "kube-reserved", "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for kubernetes system components. Currently only cpu and memory are supported. See http://kubernetes.io/docs/user-guide/compute-resources for more detail. [default=none]")
+
 	fs.BoolVar(&s.RegisterSchedulable, "register-schedulable", s.RegisterSchedulable, "Register the node as schedulable. Won't have any effect if register-node is false. [default=true]")
 	fs.MarkDeprecated("register-schedulable", "will be removed in a future version")
 	fs.Var(utiltaints.NewTaintsVar(&s.RegisterWithTaints), "register-with-taints", "Register the node with the given list of taints (comma seperated \"<key>=<value>:<effect>\"). No-op if register-node is false.")
@@ -264,4 +263,13 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&s.RemoteImageEndpoint, "image-service-endpoint", s.RemoteImageEndpoint, "[Experimental] The unix socket endpoint of remote image service. If not specified, it will be the same with container-runtime-endpoint by default. The endpoint is used only when CRI integration is enabled (--enable-cri)")
 
 	fs.BoolVar(&s.ExperimentalCheckNodeCapabilitiesBeforeMount, "experimental-check-node-capabilities-before-mount", s.ExperimentalCheckNodeCapabilitiesBeforeMount, "[Experimental] if set true, the kubelet will check the underlying node for required componenets (binaries, etc.) before performing the mount")
+
+	// Node Allocatable Flags
+	fs.Var(&s.SystemReserved, "system-reserved", "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for non-kubernetes components. Currently only cpu and memory are supported. See http://kubernetes.io/docs/user-guide/compute-resources for more detail. [default=none]")
+	fs.Var(&s.KubeReserved, "kube-reserved", "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for kubernetes system components. Currently only cpu and memory are supported. See http://kubernetes.io/docs/user-guide/compute-resources for more detail. [default=none]")
+
+	fs.StringSliceVar(&s.EnforceNodeAllocatable, "enforce-node-allocatable", s.EnforceNodeAllocatable, "A comma separated list of levels of node allocatable enforcement to be enforced by kubelet. Acceptible options are 'pods', 'system-reserved' & 'kube-reserved'. If the latter two options are specified, '--system-reserved-cgroup' & '--kube-reserved-cgroup' must also be set respectively. See https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md for more details. [default='']")
+	fs.StringVar(&s.SystemReservedCgroup, "system-reserved-cgroup", s.SystemReservedCgroup, "Absolute name of the top level cgroup that is used to manage non-kubernetes components for which compute resources were reserved via '--system-reserved' flag. Ex. '/system-reserved'. [default='']")
+	fs.StringVar(&s.KubeReservedCgroup, "kube-reserved-cgroup", s.KubeReservedCgroup, "Absolute name of the top level cgroup that is used to manage kubernetes components for which compute resources were reserved via '--kube-reserved' flag. Ex. '/kube-reserved'. [default='']")
+	fs.BoolVar(&s.ExperimentalNodeAllocatableIgnoreEvictionThreshold, "experimental-node-allocatable-ignore-eviction-threshold", s.ExperimentalNodeAllocatableIgnoreEvictionThreshold, "When set to 'true', Hard Eviction Thresholds will be ignored while calculating Node Allocatable. See https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md for more details. [default=false]")
 }

cmd/kubelet/app/server.go

@@ -40,6 +40,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apiserver/pkg/server/healthz"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
@@ -469,6 +470,14 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.KubeletDeps) (err error) {
 				CgroupDriver:          s.CgroupDriver,
 				ProtectKernelDefaults: s.ProtectKernelDefaults,
 				EnableCRI:             s.EnableCRI,
+				NodeAllocatableConfig: cm.NodeAllocatableConfig{
+					KubeReservedCgroupName:   s.KubeReservedCgroup,
+					SystemReservedCgroupName: s.SystemReservedCgroup,
+					EnforceNodeAllocatable:   sets.NewString(s.EnforceNodeAllocatable...),
+					KubeReserved:             kubeReserved,
+					SystemReserved:           systemReserved,
+					HardEvictionThresholds:   hardEvictionThresholds,
+				},
 			},
 			s.ExperimentalFailSwapOn)
 

pkg/apis/componentconfig/types.go

@@ -442,16 +442,6 @@ type KubeletConfiguration struct {
 	// manage attachment/detachment of volumes scheduled to this node, and
 	// disables kubelet from executing any attach/detach operations
 	EnableControllerAttachDetach bool
-	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
-	// that describe resources reserved for non-kubernetes components.
-	// Currently only cpu and memory are supported. [default=none]
-	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
-	SystemReserved ConfigurationMap
-	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
-	// that describe resources reserved for kubernetes system components.
-	// Currently only cpu and memory are supported. [default=none]
-	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
-	KubeReserved ConfigurationMap
 	// Default behaviour for kernel tuning
 	ProtectKernelDefaults bool
 	// If true, Kubelet ensures a set of iptables rules are present on host.
@@ -485,6 +475,32 @@ type KubeletConfiguration struct {
 	// This flag, if set, instructs the kubelet to keep volumes from terminated pods mounted to the node.
 	// This can be useful for debugging volume related issues.
 	KeepTerminatedPodVolumes bool
+
+	/* following flags are meant for Node Allocatable */
+
+	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
+	// that describe resources reserved for non-kubernetes components.
+	// Currently only cpu and memory are supported. [default=none]
+	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
+	SystemReserved ConfigurationMap
+	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
+	// that describe resources reserved for kubernetes system components.
+	// Currently only cpu and memory are supported. [default=none]
+	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
+	KubeReserved ConfigurationMap
+	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `SystemReserved` compute resource reservation for OS system daemons.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	SystemReservedCgroup string
+	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `KubeReserved` compute resource reservation for Kubernetes node system daemons.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	KubeReservedCgroup string
+	// This flag specifies the various Node Allocatable enforcements that Kubelet needs to perform.
+	// This flag accepts a list of options. Acceptible options are `pods`, `system-reserved` & `kube-reserved`.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	EnforceNodeAllocatable []string
+	// This flag, if set, will avoid including `EvictionHard` limits while computing Node Allocatable.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	ExperimentalNodeAllocatableIgnoreEvictionThreshold bool
 }
 
 type KubeletAuthorizationMode string

pkg/apis/componentconfig/v1alpha1/defaults.go

@@ -48,7 +48,12 @@ const (
 	defaultIPTablesDropBit       = 15
 )
 
-var zeroDuration = metav1.Duration{}
+var (
+	zeroDuration = metav1.Duration{}
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	// TODO: Set the default to "pods" once cgroups per qos is turned on by default.
+	defaultNodeAllocatableEnforcement = []string{}
+)
 
 func addDefaultingFuncs(scheme *kruntime.Scheme) error {
 	RegisterDefaults(scheme)
@@ -401,6 +406,9 @@ func SetDefaults_KubeletConfiguration(obj *KubeletConfiguration) {
 	if obj.CgroupDriver == "" {
 		obj.CgroupDriver = "cgroupfs"
 	}
+	if obj.EnforceNodeAllocatable == nil {
+		obj.EnforceNodeAllocatable = defaultNodeAllocatableEnforcement
+	}
 	if obj.EnableCRI == nil {
 		obj.EnableCRI = boolVar(true)
 	}

pkg/apis/componentconfig/v1alpha1/types.go

@@ -478,16 +478,6 @@ type KubeletConfiguration struct {
 	// manage attachment/detachment of volumes scheduled to this node, and
 	// disables kubelet from executing any attach/detach operations
 	EnableControllerAttachDetach *bool `json:"enableControllerAttachDetach"`
-	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
-	// that describe resources reserved for non-kubernetes components.
-	// Currently only cpu and memory are supported. [default=none]
-	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
-	SystemReserved map[string]string `json:"systemReserved"`
-	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
-	// that describe resources reserved for kubernetes system components.
-	// Currently only cpu and memory are supported. [default=none]
-	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
-	KubeReserved map[string]string `json:"kubeReserved"`
 	// Default behaviour for kernel tuning
 	ProtectKernelDefaults bool `json:"protectKernelDefaults"`
 	// If true, Kubelet ensures a set of iptables rules are present on host.
@@ -522,6 +512,33 @@ type KubeletConfiguration struct {
 	// This flag, if set, instructs the kubelet to keep volumes from terminated pods mounted to the node.
 	// This can be useful for debugging volume related issues.
 	KeepTerminatedPodVolumes bool `json:"keepTerminatedPodVolumes,omitempty"`
+
+	/* following flags are meant for Node Allocatable */
+
+	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
+	// that describe resources reserved for non-kubernetes components.
+	// Currently only cpu and memory are supported. [default=none]
+	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
+	SystemReserved map[string]string `json:"systemReserved"`
+	// A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs
+	// that describe resources reserved for kubernetes system components.
+	// Currently only cpu and memory are supported. [default=none]
+	// See http://kubernetes.io/docs/user-guide/compute-resources for more detail.
+	KubeReserved map[string]string `json:"kubeReserved"`
+
+	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `SystemReserved` compute resource reservation for OS system daemons.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	SystemReservedCgroup string `json:"systemReservedCgroup,omitempty"`
+	// This flag helps kubelet identify absolute name of top level cgroup used to enforce `KubeReserved` compute resource reservation for Kubernetes node system daemons.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	KubeReservedCgroup string `json:"kubeReservedCgroup,omitempty"`
+	// This flag specifies the various Node Allocatable enforcements that Kubelet needs to perform.
+	// This flag accepts a list of options. Acceptible options are `pods`, `system-reserved` & `kube-reserved`.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	EnforceNodeAllocatable []string `json:"enforceNodeAllocatable,omitempty"`
+	// This flag, if set, will avoid including `EvictionHard` limits while computing Node Allocatable.
+	// Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.
+	ExperimentalNodeAllocatableIgnoreEvictionThreshold bool `json:"experimentalNodeAllocatableIgnoreEvictionThreshold,omitempty"`
 }
 
 type KubeletAuthorizationMode string

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

@@ -396,8 +396,6 @@ func autoConvert_v1alpha1_KubeletConfiguration_To_componentconfig_KubeletConfigu
 	if err := v1.Convert_Pointer_bool_To_bool(&in.EnableControllerAttachDetach, &out.EnableControllerAttachDetach, s); err != nil {
 		return err
 	}
-	out.SystemReserved = *(*componentconfig.ConfigurationMap)(unsafe.Pointer(&in.SystemReserved))
-	out.KubeReserved = *(*componentconfig.ConfigurationMap)(unsafe.Pointer(&in.KubeReserved))
 	out.ProtectKernelDefaults = in.ProtectKernelDefaults
 	if err := v1.Convert_Pointer_bool_To_bool(&in.MakeIPTablesUtilChains, &out.MakeIPTablesUtilChains, s); err != nil {
 		return err
@@ -416,6 +414,12 @@ func autoConvert_v1alpha1_KubeletConfiguration_To_componentconfig_KubeletConfigu
 	out.ExperimentalFailSwapOn = in.ExperimentalFailSwapOn
 	out.ExperimentalCheckNodeCapabilitiesBeforeMount = in.ExperimentalCheckNodeCapabilitiesBeforeMount
 	out.KeepTerminatedPodVolumes = in.KeepTerminatedPodVolumes
+	out.SystemReserved = *(*componentconfig.ConfigurationMap)(unsafe.Pointer(&in.SystemReserved))
+	out.KubeReserved = *(*componentconfig.ConfigurationMap)(unsafe.Pointer(&in.KubeReserved))
+	out.SystemReservedCgroup = in.SystemReservedCgroup
+	out.KubeReservedCgroup = in.KubeReservedCgroup
+	out.EnforceNodeAllocatable = *(*[]string)(unsafe.Pointer(&in.EnforceNodeAllocatable))
+	out.ExperimentalNodeAllocatableIgnoreEvictionThreshold = in.ExperimentalNodeAllocatableIgnoreEvictionThreshold
 	return nil
 }
 
@@ -570,8 +574,6 @@ func autoConvert_componentconfig_KubeletConfiguration_To_v1alpha1_KubeletConfigu
 	if err := v1.Convert_bool_To_Pointer_bool(&in.EnableControllerAttachDetach, &out.EnableControllerAttachDetach, s); err != nil {
 		return err
 	}
-	out.SystemReserved = *(*map[string]string)(unsafe.Pointer(&in.SystemReserved))
-	out.KubeReserved = *(*map[string]string)(unsafe.Pointer(&in.KubeReserved))
 	out.ProtectKernelDefaults = in.ProtectKernelDefaults
 	if err := v1.Convert_bool_To_Pointer_bool(&in.MakeIPTablesUtilChains, &out.MakeIPTablesUtilChains, s); err != nil {
 		return err
@@ -590,6 +592,12 @@ func autoConvert_componentconfig_KubeletConfiguration_To_v1alpha1_KubeletConfigu
 	out.ExperimentalFailSwapOn = in.ExperimentalFailSwapOn
 	out.ExperimentalCheckNodeCapabilitiesBeforeMount = in.ExperimentalCheckNodeCapabilitiesBeforeMount
 	out.KeepTerminatedPodVolumes = in.KeepTerminatedPodVolumes
+	out.SystemReserved = *(*map[string]string)(unsafe.Pointer(&in.SystemReserved))
+	out.KubeReserved = *(*map[string]string)(unsafe.Pointer(&in.KubeReserved))
+	out.SystemReservedCgroup = in.SystemReservedCgroup
+	out.KubeReservedCgroup = in.KubeReservedCgroup
+	out.EnforceNodeAllocatable = *(*[]string)(unsafe.Pointer(&in.EnforceNodeAllocatable))
+	out.ExperimentalNodeAllocatableIgnoreEvictionThreshold = in.ExperimentalNodeAllocatableIgnoreEvictionThreshold
 	return nil
 }
 

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

@@ -266,20 +266,6 @@ func DeepCopy_v1alpha1_KubeletConfiguration(in interface{}, out interface{}, c *
 			*out = new(bool)
 			**out = **in
 		}
-		if in.SystemReserved != nil {
-			in, out := &in.SystemReserved, &out.SystemReserved
-			*out = make(map[string]string)
-			for key, val := range *in {
-				(*out)[key] = val
-			}
-		}
-		if in.KubeReserved != nil {
-			in, out := &in.KubeReserved, &out.KubeReserved
-			*out = make(map[string]string)
-			for key, val := range *in {
-				(*out)[key] = val
-			}
-		}
 		if in.MakeIPTablesUtilChains != nil {
 			in, out := &in.MakeIPTablesUtilChains, &out.MakeIPTablesUtilChains
 			*out = new(bool)
@@ -305,6 +291,25 @@ func DeepCopy_v1alpha1_KubeletConfiguration(in interface{}, out interface{}, c *
 			*out = new(bool)
 			**out = **in
 		}
+		if in.SystemReserved != nil {
+			in, out := &in.SystemReserved, &out.SystemReserved
+			*out = make(map[string]string)
+			for key, val := range *in {
+				(*out)[key] = val
+			}
+		}
+		if in.KubeReserved != nil {
+			in, out := &in.KubeReserved, &out.KubeReserved
+			*out = make(map[string]string)
+			for key, val := range *in {
+				(*out)[key] = val
+			}
+		}
+		if in.EnforceNodeAllocatable != nil {
+			in, out := &in.EnforceNodeAllocatable, &out.EnforceNodeAllocatable
+			*out = make([]string, len(*in))
+			copy(*out, *in)
+		}
 		return nil
 	}
 }

pkg/apis/componentconfig/zz_generated.deepcopy.go

@@ -177,6 +177,11 @@ func DeepCopy_componentconfig_KubeletConfiguration(in interface{}, out interface
 				(*out)[key] = val
 			}
 		}
+		if in.AllowedUnsafeSysctls != nil {
+			in, out := &in.AllowedUnsafeSysctls, &out.AllowedUnsafeSysctls
+			*out = make([]string, len(*in))
+			copy(*out, *in)
+		}
 		if in.SystemReserved != nil {
 			in, out := &in.SystemReserved, &out.SystemReserved
 			*out = make(ConfigurationMap)
@@ -191,8 +196,8 @@ func DeepCopy_componentconfig_KubeletConfiguration(in interface{}, out interface
 				(*out)[key] = val
 			}
 		}
-		if in.AllowedUnsafeSysctls != nil {
-			in, out := &in.AllowedUnsafeSysctls, &out.AllowedUnsafeSysctls
+		if in.EnforceNodeAllocatable != nil {
+			in, out := &in.EnforceNodeAllocatable, &out.EnforceNodeAllocatable
 			*out = make([]string, len(*in))
 			copy(*out, *in)
 		}

pkg/generated/openapi/zz_generated.openapi.go

@@ -13283,34 +13283,6 @@ func GetOpenAPIDefinitions(ref openapi.ReferenceCallback) map[string]openapi.Ope
 								Format:      "",
 							},
 						},
-						"systemReserved": {
-							SchemaProps: spec.SchemaProps{
-								Description: "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for non-kubernetes components. Currently only cpu and memory are supported. [default=none] See http://kubernetes.io/docs/user-guide/compute-resources for more detail.",
-								Type:        []string{"object"},
-								AdditionalProperties: &spec.SchemaOrBool{
-									Schema: &spec.Schema{
-										SchemaProps: spec.SchemaProps{
-											Type:   []string{"string"},
-											Format: "",
-										},
-									},
-								},
-							},
-						},
-						"kubeReserved": {
-							SchemaProps: spec.SchemaProps{
-								Description: "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for kubernetes system components. Currently only cpu and memory are supported. [default=none] See http://kubernetes.io/docs/user-guide/compute-resources for more detail.",
-								Type:        []string{"object"},
-								AdditionalProperties: &spec.SchemaOrBool{
-									Schema: &spec.Schema{
-										SchemaProps: spec.SchemaProps{
-											Type:   []string{"string"},
-											Format: "",
-										},
-									},
-								},
-							},
-						},
 						"protectKernelDefaults": {
 							SchemaProps: spec.SchemaProps{
 								Description: "Default behaviour for kernel tuning",
@@ -13388,8 +13360,71 @@ func GetOpenAPIDefinitions(ref openapi.ReferenceCallback) map[string]openapi.Ope
 								Format:      "",
 							},
 						},
+						"systemReserved": {
+							SchemaProps: spec.SchemaProps{
+								Description: "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for non-kubernetes components. Currently only cpu and memory are supported. [default=none] See http://kubernetes.io/docs/user-guide/compute-resources for more detail.",
+								Type:        []string{"object"},
+								AdditionalProperties: &spec.SchemaOrBool{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Type:   []string{"string"},
+											Format: "",
+										},
+									},
+								},
+							},
+						},
+						"kubeReserved": {
+							SchemaProps: spec.SchemaProps{
+								Description: "A set of ResourceName=ResourceQuantity (e.g. cpu=200m,memory=150G) pairs that describe resources reserved for kubernetes system components. Currently only cpu and memory are supported. [default=none] See http://kubernetes.io/docs/user-guide/compute-resources for more detail.",
+								Type:        []string{"object"},
+								AdditionalProperties: &spec.SchemaOrBool{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Type:   []string{"string"},
+											Format: "",
+										},
+									},
+								},
+							},
+						},
+						"systemReservedCgroup": {
+							SchemaProps: spec.SchemaProps{
+								Description: "This flag helps kubelet identify absolute name of top level cgroup used to enforce `SystemReserved` compute resource reservation for OS system daemons. Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"kubeReservedCgroup": {
+							SchemaProps: spec.SchemaProps{
+								Description: "This flag helps kubelet identify absolute name of top level cgroup used to enforce `KubeReserved` compute resource reservation for Kubernetes node system daemons. Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"enforceNodeAllocatable": {
+							SchemaProps: spec.SchemaProps{
+								Description: "This flag specifies the various Node Allocatable enforcements that Kubelet needs to perform. This flag accepts a list of options. Acceptible options are `pods`, `system-reserved` & `kube-reserved`. Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Type:   []string{"string"},
+											Format: "",
+										},
+									},
+								},
+							},
+						},
+						"experimentalNodeAllocatableIgnoreEvictionThreshold": {
+							SchemaProps: spec.SchemaProps{
+								Description: "This flag, if set, will avoid including `EvictionHard` limits while computing Node Allocatable. Refer to [Node Allocatable](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node-allocatable.md) doc for more information.",
+								Type:        []string{"boolean"},
+								Format:      "",
+							},
+						},
 					},
-					Required: []string{"podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "authentication", "authorization", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginDir", "cniConfDir", "cniBinDir", "networkPluginMTU", "volumePluginDir", "cloudProvider", "cloudConfigFile", "kubeletCgroups", "runtimeCgroups", "systemCgroups", "cgroupRoot", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "runtimeRequestTimeout", "rktPath", "rktAPIEndpoint", "rktStage1Image", "lockFilePath", "exitOnLockContention", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "registerSchedulable", "registerWithTaints", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "outOfDiskTransitionFrequency", "nodeIP", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "evictionHard", "evictionSoft", "evictionSoftGracePeriod", "evictionPressureTransitionPeriod", "evictionMaxPodGracePeriod", "evictionMinimumReclaim", "experimentalKernelMemcgNotification", "podsPerCore", "enableControllerAttachDetach", "systemReserved", "kubeReserved", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit"},
+					Required: []string{"podManifestPath", "syncFrequency", "fileCheckFrequency", "httpCheckFrequency", "manifestURL", "manifestURLHeader", "enableServer", "address", "port", "readOnlyPort", "tlsCertFile", "tlsPrivateKeyFile", "certDirectory", "authentication", "authorization", "hostnameOverride", "podInfraContainerImage", "dockerEndpoint", "rootDirectory", "seccompProfileRoot", "allowPrivileged", "hostNetworkSources", "hostPIDSources", "hostIPCSources", "registryPullQPS", "registryBurst", "eventRecordQPS", "eventBurst", "enableDebuggingHandlers", "minimumGCAge", "maxPerPodContainerCount", "maxContainerCount", "cAdvisorPort", "healthzPort", "healthzBindAddress", "oomScoreAdj", "registerNode", "clusterDomain", "masterServiceNamespace", "clusterDNS", "streamingConnectionIdleTimeout", "nodeStatusUpdateFrequency", "imageMinimumGCAge", "imageGCHighThresholdPercent", "imageGCLowThresholdPercent", "lowDiskSpaceThresholdMB", "volumeStatsAggPeriod", "networkPluginName", "networkPluginDir", "cniConfDir", "cniBinDir", "networkPluginMTU", "volumePluginDir", "cloudProvider", "cloudConfigFile", "kubeletCgroups", "runtimeCgroups", "systemCgroups", "cgroupRoot", "containerRuntime", "remoteRuntimeEndpoint", "remoteImageEndpoint", "runtimeRequestTimeout", "rktPath", "rktAPIEndpoint", "rktStage1Image", "lockFilePath", "exitOnLockContention", "hairpinMode", "babysitDaemons", "maxPods", "nvidiaGPUs", "dockerExecHandlerName", "podCIDR", "resolvConf", "cpuCFSQuota", "containerized", "maxOpenFiles", "registerSchedulable", "registerWithTaints", "contentType", "kubeAPIQPS", "kubeAPIBurst", "serializeImagePulls", "outOfDiskTransitionFrequency", "nodeIP", "nodeLabels", "nonMasqueradeCIDR", "enableCustomMetrics", "evictionHard", "evictionSoft", "evictionSoftGracePeriod", "evictionPressureTransitionPeriod", "evictionMaxPodGracePeriod", "evictionMinimumReclaim", "experimentalKernelMemcgNotification", "podsPerCore", "enableControllerAttachDetach", "protectKernelDefaults", "makeIPTablesUtilChains", "iptablesMasqueradeBit", "iptablesDropBit", "systemReserved", "kubeReserved"},
 				},
 			},
 			Dependencies: []string{

pkg/kubelet/cm/container_manager.go

@@ -16,7 +16,10 @@ limitations under the License.
 
 package cm
 
-import "k8s.io/kubernetes/pkg/api/v1"
+import (
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/kubernetes/pkg/api/v1"
+)
 
 // Manages the containers running on a machine.
 type ContainerManager interface {
@@ -56,6 +59,16 @@ type NodeConfig struct {
 	CgroupDriver          string
 	ProtectKernelDefaults bool
 	EnableCRI             bool
+	NodeAllocatableConfig
+}
+
+type NodeAllocatableConfig struct {
+	KubeReservedCgroupName   string
+	SystemReservedCgroupName string
+	EnforceNodeAllocatable   sets.String
+	KubeReserved             v1.ResourceList
+	SystemReserved           v1.ResourceList
+	HardEvictionThresholds   []evictionapi.Threshold
 }
 
 type Status struct {

pkg/kubelet/cm/node_allocatable.go

@@ -0,0 +1,164 @@
+// +build linux
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cm
+
+import (
+	"fmt"
+
+	"github.com/golang/glog"
+
+	"k8s.io/kubernetes/pkg/api/v1"
+	evictionapi "k8s.io/kubernetes/pkg/kubelet/eviction/api"
+)
+
+const (
+	defaultNodeAllocatableCgroupName = "/kubepods"
+	nodeAllocatableEnforcementKey    = "pods"
+	systemReservedEnforcementKey     = "system-reserved"
+	kubeReservedEnforcementKey       = "kube-reserved"
+)
+
+func createNodeAllocatableCgroups(nc NodeAllocatableConfig, nodeAllocatable v1.ResourceList, cgroupManager CgroupManager) error {
+	cgroupConfig := &CgroupConfig{
+		Name: CgroupName(defaultNodeAllocatableCgroupName),
+	}
+	if err := cgroupManager.Create(cgroupConfig); err != nil {
+		glog.Errorf("Failed to create %q cgroup and apply limits")
+		return err
+	}
+	return nil
+}
+
+// Enforce Node Allocatable Cgroup settings.
+func enforceNodeAllocatableCgroups(nc NodeAllocatableConfig, nodeAllocatable v1.ResourceList, cgroupManager CgroupManager) error {
+	glog.V(4).Infof("Attempting to enforce Node Allocatable with config: %+v", nc)
+	glog.V(4).Infof("Node Allocatable resources: %+v", nodeAllocatable)
+	// Create top level cgroups for all pods if necessary.
+	if nc.EnforceNodeAllocatable.Has(nodeAllocatableEnforcementKey) {
+		cgroupConfig := &CgroupConfig{
+			Name:               CgroupName(defaultNodeAllocatableCgroupName),
+			ResourceParameters: getCgroupConfig(nodeAllocatable),
+		}
+		glog.V(4).Infof("Updating Node Allocatable cgroup with %d cpu shares and %d bytes of memory", cgroupConfig.ResourceParameters.CpuShares, cgroupConfig.ResourceParameters.Memory)
+		if err := cgroupManager.Update(cgroupConfig); err != nil {
+			glog.Errorf("Failed to create %q cgroup and apply limits")
+			return err
+		}
+	}
+	// Now apply kube reserved and system reserved limits if required.
+	if nc.EnforceNodeAllocatable.Has(systemReservedEnforcementKey) {
+		glog.V(2).Infof("Enforcing system reserved on cgroup %q with limits: %+v", nc.SystemReservedCgroupName, nc.SystemReserved)
+		if err := enforceExistingCgroup(cgroupManager, nc.SystemReservedCgroupName, nc.SystemReserved); err != nil {
+			return fmt.Errorf("failed to enforce System Reserved Cgroup Limits: %v", err)
+		}
+	}
+	if nc.EnforceNodeAllocatable.Has(kubeReservedEnforcementKey) {
+		glog.V(2).Infof("Enforcing kube reserved on cgroup %q with limits: %+v", nc.KubeReservedCgroupName, nc.KubeReserved)
+		if err := enforceExistingCgroup(cgroupManager, nc.KubeReservedCgroupName, nc.KubeReserved); err != nil {
+			return fmt.Errorf("failed to enforce Kube Reserved Cgroup Limits: %v", err)
+		}
+	}
+	return nil
+}
+
+func enforceExistingCgroup(cgroupManager CgroupManager, cName string, rl v1.ResourceList) error {
+	cgroupConfig := &CgroupConfig{
+		Name:               CgroupName(cName),
+		ResourceParameters: getCgroupConfig(rl),
+	}
+	glog.V(4).Infof("Enforcing limits on cgroup %q with %d cpu shares and %d bytes of memory", cName, cgroupConfig.ResourceParameters.CpuShares, cgroupConfig.ResourceParameters.Memory)
+	if !cgroupManager.Exists(cgroupConfig.Name) {
+		return fmt.Errorf("%q cgroup does not exist", cgroupConfig.Name)
+	}
+	if err := cgroupManager.Update(cgroupConfig); err != nil {
+		return err
+	}
+	return nil
+}
+
+func getCgroupConfig(rl v1.ResourceList) *ResourceConfig {
+	// TODO(vishh): Set CPU Quota if necessary.
+	if rl == nil {
+		return nil
+	}
+	var rc ResourceConfig
+	if q, exists := rl[v1.ResourceMemory]; exists {
+		// Memory is defined in bytes.
+		val := q.Value()
+		rc.Memory = &val
+	}
+	if q, exists := rl[v1.ResourceCPU]; exists {
+		// CPU is defined in milli-cores.
+		val := MilliCPUToShares(q.MilliValue())
+		rc.CpuShares = &val
+	}
+	return &rc
+}
+
+func (cm *containerManagerImpl) getNodeAllocatableInternal(includeHardEviction bool) v1.ResourceList {
+	var evictionReservation v1.ResourceList
+	if includeHardEviction {
+		evictionReservation = hardEvictionReservation(cm.HardEvictionThresholds, cm.capacity)
+	}
+	result := make(v1.ResourceList)
+	for k, v := range cm.capacity {
+		value := *(v.Copy())
+		if cm.NodeConfig.SystemReserved != nil {
+			value.Sub(cm.NodeConfig.SystemReserved[k])
+		}
+		if cm.NodeConfig.KubeReserved != nil {
+			value.Sub(cm.NodeConfig.KubeReserved[k])
+		}
+		if evictionReservation != nil {
+			value.Sub(evictionReservation[k])
+		}
+		if value.Sign() < 0 {
+			// Negative Allocatable resources don't make sense.
+			value.Set(0)
+		}
+		result[k] = value
+	}
+	return result
+
+}
+
+// GetNodeAllocatable returns amount of compute resource available for pods.
+func (cm *containerManagerImpl) GetNodeAllocatable() v1.ResourceList {
+	return cm.getNodeAllocatableInternal(!cm.NodeConfig.IgnoreHardEvictionThreshold)
+}
+
+// hardEvictionReservation returns a resourcelist that includes reservation of resources based on hard eviction thresholds.
+func hardEvictionReservation(thresholds []evictionapi.Threshold, capacity v1.ResourceList) v1.ResourceList {
+	if len(thresholds) == 0 {
+		return nil
+	}
+	ret := v1.ResourceList{}
+	for _, threshold := range thresholds {
+		if threshold.Operator != evictionapi.OpLessThan {
+			continue
+		}
+		switch threshold.Signal {
+		case evictionapi.SignalMemoryAvailable:
+			memoryCapacity := capacity[v1.ResourceMemory]
+			value := evictionapi.GetThresholdQuantity(threshold.Value, &memoryCapacity)
+			ret[v1.ResourceMemory] = *value
+		}
+	}
+	return ret
+}