core

package
v0.0.0-...-0a82f0e Latest Latest
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 Go to latest Published: Jan 24, 2019 License: Apache-2.0 Imports: 51 Imported by: 0

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Index

Constants

View Source 
const (
	// MaxKubernetesEmptyNodeDeletionTime is the maximum time needed by Kubernetes to delete an empty node.
	MaxKubernetesEmptyNodeDeletionTime = 3 * time.Minute
	// MaxCloudProviderNodeDeletionTime is the maximum time needed by cloud provider to delete a node.
	MaxCloudProviderNodeDeletionTime = 5 * time.Minute
	// MaxPodEvictionTime is the maximum time CA tries to evict a pod before giving up.
	MaxPodEvictionTime = 2 * time.Minute
	// EvictionRetryTime is the time after CA retries failed pod eviction.
	EvictionRetryTime = 10 * time.Second
	// PodEvictionHeadroom is the extra time we wait to catch situations when the pod is ignoring SIGTERM and
	// is killed with SIGKILL after MaxGracefulTerminationTime
	PodEvictionHeadroom = 30 * time.Second
)
View Source 
const (
	// ReschedulerTaintKey is the name of the taint created by rescheduler.
	ReschedulerTaintKey = "CriticalAddonsOnly"
)
View Source 
const (
	// ScaleDownDisabledKey is the name of annotation marking node as not eligible for scale down.
	ScaleDownDisabledKey = "cluster-autoscaler.kubernetes.io/scale-down-disabled"
)

Variables

This section is empty.

Functions

func CheckPodsSchedulableOnNode 

func CheckPodsSchedulableOnNode(context *context.AutoscalingContext, pods []*apiv1.Pod, nodeGroupId string, nodeInfo *schedulercache.NodeInfo) map[*apiv1.Pod]*simulator.PredicateError

CheckPodsSchedulableOnNode checks if pods can be scheduled on the given node.

func ConfigurePredicateCheckerForLoop 

func ConfigurePredicateCheckerForLoop(unschedulablePods []*apiv1.Pod, schedulablePods []*apiv1.Pod, predicateChecker *simulator.PredicateChecker)

ConfigurePredicateCheckerForLoop can be run to update predicateChecker configuration based on current state of the cluster.

func FilterOutExpendableAndSplit 

func FilterOutExpendableAndSplit(unschedulableCandidates []*apiv1.Pod, expendablePodsPriorityCutoff int) ([]*apiv1.Pod, []*apiv1.Pod)

FilterOutExpendableAndSplit filters out expendable pods and splits into:

  • waiting for lower priority pods preemption
  • other pods.

func FilterOutExpendablePods 

func FilterOutExpendablePods(pods []*apiv1.Pod, expendablePodsPriorityCutoff int) []*apiv1.Pod

FilterOutExpendablePods filters out expendable pods.

func FilterOutNodesFromNotAutoscaledGroups 

func FilterOutNodesFromNotAutoscaledGroups(nodes []*apiv1.Node, cloudProvider cloudprovider.CloudProvider) ([]*apiv1.Node, errors.AutoscalerError)

FilterOutNodesFromNotAutoscaledGroups return subset of input nodes for which cloud provider does not return autoscaled node group.

func FilterOutSchedulable 

func FilterOutSchedulable(unschedulableCandidates []*apiv1.Pod, nodes []*apiv1.Node, allScheduled []*apiv1.Pod, podsWaitingForLowerPriorityPreemption []*apiv1.Pod,
	predicateChecker *simulator.PredicateChecker, expendablePodsPriorityCutoff int) []*apiv1.Pod

FilterOutSchedulable checks whether pods from <unschedulableCandidates> marked as unschedulable by Scheduler actually can't be scheduled on any node and filter out the ones that can. It takes into account pods that are bound to node and will be scheduled after lower priority pod preemption.

func GetNodeInfoFromTemplate 

func GetNodeInfoFromTemplate(nodeGroup cloudprovider.NodeGroup, daemonsets []*appsv1.DaemonSet, predicateChecker *simulator.PredicateChecker) (*schedulercache.NodeInfo, errors.AutoscalerError)

GetNodeInfoFromTemplate returns NodeInfo object built base on TemplateNodeInfo returned by NodeGroup.TemplateNodeInfo().

func GetNodeInfosForGroups 

func GetNodeInfosForGroups(nodes []*apiv1.Node, cloudProvider cloudprovider.CloudProvider, listers kube_util.ListerRegistry,
	daemonsets []*appsv1.DaemonSet, predicateChecker *simulator.PredicateChecker) (map[string]*schedulercache.NodeInfo, errors.AutoscalerError)

GetNodeInfosForGroups finds NodeInfos for all node groups used to manage the given nodes. It also returns a node group to sample node mapping. TODO(mwielgus): This returns map keyed by url, while most code (including scheduler) uses node.Name for a key.

TODO(mwielgus): Review error policy - sometimes we may continue with partial errors.

func NewScaleTestAutoscalingContext 

func NewScaleTestAutoscalingContext(options config.AutoscalingOptions, fakeClient kube_client.Interface, listers kube_util.ListerRegistry, provider cloudprovider.CloudProvider) context.AutoscalingContext

NewScaleTestAutoscalingContext creates a new test autoscaling context for scaling tests.

func ScaleUp 

func ScaleUp(context *context.AutoscalingContext, processors *ca_processors.AutoscalingProcessors, clusterStateRegistry *clusterstate.ClusterStateRegistry, unschedulablePods []*apiv1.Pod,
	nodes []*apiv1.Node, daemonSets []*appsv1.DaemonSet, nodeInfos map[string]*schedulercache.NodeInfo) (*status.ScaleUpStatus, errors.AutoscalerError)

ScaleUp tries to scale the cluster up. Return true if it found a way to increase the size, false if it didn't and error if an error occurred. Assumes that all nodes in the cluster are ready and in sync with instance groups.

func UpdateClusterStateMetrics 

func UpdateClusterStateMetrics(csr *clusterstate.ClusterStateRegistry)

UpdateClusterStateMetrics updates metrics related to cluster state

func UpdateEmptyClusterStateMetrics 

func UpdateEmptyClusterStateMetrics()

UpdateEmptyClusterStateMetrics updates metrics related to empty cluster's state. TODO(aleksandra-malinowska): use long unregistered value from ClusterStateRegistry.

Types

type Autoscaler 

type Autoscaler interface {
	// RunOnce represents an iteration in the control-loop of CA
	RunOnce(currentTime time.Time) errors.AutoscalerError
	// ExitCleanUp is a clean-up performed just before process termination.
	ExitCleanUp()
}

Autoscaler is the main component of CA which scales up/down node groups according to its configuration The configuration can be injected at the creation of an autoscaler

func NewAutoscaler 

func NewAutoscaler(opts AutoscalerOptions) (Autoscaler, errors.AutoscalerError)

NewAutoscaler creates an autoscaler of an appropriate type according to the parameters

type AutoscalerOptions 

type AutoscalerOptions struct {
	config.AutoscalingOptions
	KubeClient             kube_client.Interface
	AutoscalingKubeClients *context.AutoscalingKubeClients
	CloudProvider          cloudprovider.CloudProvider
	PredicateChecker       *simulator.PredicateChecker
	ExpanderStrategy       expander.Strategy
	EstimatorBuilder       estimator.EstimatorBuilder
	Processors             *ca_processors.AutoscalingProcessors
	Backoff                backoff.Backoff
}

AutoscalerOptions is the whole set of options for configuring an autoscaler

type NodeDeleteStatus 

type NodeDeleteStatus struct {
	sync.Mutex
	// contains filtered or unexported fields
}

NodeDeleteStatus tells whether a node is being deleted right now.

func (*NodeDeleteStatus) AddNodeDeleteResult 

func (n *NodeDeleteStatus) AddNodeDeleteResult(nodeName string, result error)

AddNodeDeleteResult adds a node delete result to the result map.

func (*NodeDeleteStatus) DrainNodeDeleteResults 

func (n *NodeDeleteStatus) DrainNodeDeleteResults() map[string]error

DrainNodeDeleteResults returns the whole result map and replaces it with a new empty one.

func (*NodeDeleteStatus) IsDeleteInProgress 

func (n *NodeDeleteStatus) IsDeleteInProgress() bool

IsDeleteInProgress returns true if a node is being deleted.

func (*NodeDeleteStatus) SetDeleteInProgress 

func (n *NodeDeleteStatus) SetDeleteInProgress(status bool)

SetDeleteInProgress sets deletion process status

type ScaleDown 

type ScaleDown struct {
	// contains filtered or unexported fields
}

ScaleDown is responsible for maintaining the state needed to perform unneeded node removals.

func NewScaleDown 

func NewScaleDown(context *context.AutoscalingContext, clusterStateRegistry *clusterstate.ClusterStateRegistry) *ScaleDown

NewScaleDown builds new ScaleDown object.

func (*ScaleDown) CleanUp 

func (sd *ScaleDown) CleanUp(timestamp time.Time)

CleanUp cleans up the internal ScaleDown state.

func (*ScaleDown) CleanUpUnneededNodes 

func (sd *ScaleDown) CleanUpUnneededNodes()

CleanUpUnneededNodes clears the list of unneeded nodes.

func (*ScaleDown) GetCandidatesForScaleDown 

func (sd *ScaleDown) GetCandidatesForScaleDown() []*apiv1.Node

GetCandidatesForScaleDown gets candidates for scale down.

func (*ScaleDown) SoftTaintUnneededNodes 

func (sd *ScaleDown) SoftTaintUnneededNodes(allNodes []*apiv1.Node) (errors []error)

SoftTaintUnneededNodes manage soft taints of unneeded nodes.

func (*ScaleDown) TryToScaleDown 

func (sd *ScaleDown) TryToScaleDown(allNodes []*apiv1.Node, pods []*apiv1.Pod, pdbs []*policyv1.PodDisruptionBudget, currentTime time.Time) (*status.ScaleDownStatus, errors.AutoscalerError)

TryToScaleDown tries to scale down the cluster. It returns a result inside a ScaleDownStatus indicating if any node was removed and error if such occurred.

func (*ScaleDown) UpdateUnneededNodes 

func (sd *ScaleDown) UpdateUnneededNodes(
	nodes []*apiv1.Node,
	nodesToCheck []*apiv1.Node,
	pods []*apiv1.Pod,
	timestamp time.Time,
	pdbs []*policyv1.PodDisruptionBudget) errors.AutoscalerError

UpdateUnneededNodes calculates which nodes are not needed, i.e. all pods can be scheduled somewhere else, and updates unneededNodes map accordingly. It also computes information where pods can be rescheduled and node utilization level. Timestamp is the current timestamp. The computations are made only for the nodes managed by CA.

type StaticAutoscaler 

type StaticAutoscaler struct {
	// AutoscalingContext consists of validated settings and options for this autoscaler
	*context.AutoscalingContext
	// contains filtered or unexported fields
}

StaticAutoscaler is an autoscaler which has all the core functionality of a CA but without the reconfiguration feature

func NewStaticAutoscaler 

func NewStaticAutoscaler(
	opts config.AutoscalingOptions,
	predicateChecker *simulator.PredicateChecker,
	autoscalingKubeClients *context.AutoscalingKubeClients,
	processors *ca_processors.AutoscalingProcessors,
	cloudProvider cloudprovider.CloudProvider,
	expanderStrategy expander.Strategy,
	estimatorBuilder estimator.EstimatorBuilder,
	backoff backoff.Backoff) *StaticAutoscaler

NewStaticAutoscaler creates an instance of Autoscaler filled with provided parameters

func (*StaticAutoscaler) ExitCleanUp 

func (a *StaticAutoscaler) ExitCleanUp()

ExitCleanUp performs all necessary clean-ups when the autoscaler's exiting.

func (*StaticAutoscaler) RunOnce 

func (a *StaticAutoscaler) RunOnce(currentTime time.Time) errors.AutoscalerError

RunOnce iterates over node groups and scales them up/down if necessary

Source Files

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