predicates

package
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 Go to latest Published: Oct 27, 2017 License: Apache-2.0 Imports: 25 Imported by: 0

Documentation

Index

Examples

Constants

View Source 
const (
	MatchInterPodAffinity = "MatchInterPodAffinity"

	// DefaultMaxGCEPDVolumes defines the maximum number of PD Volumes for GCE
	// GCE instances can have up to 16 PD volumes attached.
	DefaultMaxGCEPDVolumes = 16
	// DefaultMaxAzureDiskVolumes defines the maximum number of PD Volumes for Azure
	// Larger Azure VMs can actually have much more disks attached.
	// TODO We should determine the max based on VM size
	DefaultMaxAzureDiskVolumes = 16

	// KubeMaxPDVols defines the maximum number of PD Volumes per kubelet
	KubeMaxPDVols = "KUBE_MAX_PD_VOLS"

	// for EBSVolumeFilter
	EBSVolumeFilterType = "EBS"
	// for GCEPDVolumeFilter
	GCEPDVolumeFilterType = "GCE"
	// for AzureDiskVolumeFilter
	AzureDiskVolumeFilterType = "AzureDisk"
)

Variables

View Source 
var (

	// NOTE: If you add a new predicate failure error for a predicate that can never
	// be made to pass by removing pods, or you change an existing predicate so that
	// it can never be made to pass by removing pods, you need to add the predicate
	// failure error in nodesWherePreemptionMightHelp() in scheduler/core/generic_scheduler.go
	ErrDiskConflict                          = newPredicateFailureError("NoDiskConflict")
	ErrVolumeZoneConflict                    = newPredicateFailureError("NoVolumeZoneConflict")
	ErrNodeSelectorNotMatch                  = newPredicateFailureError("MatchNodeSelector")
	ErrPodAffinityNotMatch                   = newPredicateFailureError("MatchInterPodAffinity")
	ErrPodAffinityRulesNotMatch              = newPredicateFailureError("PodAffinityRulesNotMatch")
	ErrPodAntiAffinityRulesNotMatch          = newPredicateFailureError("PodAntiAffinityRulesNotMatch")
	ErrExistingPodsAntiAffinityRulesNotMatch = newPredicateFailureError("ExistingPodsAntiAffinityRulesNotMatch")
	ErrTaintsTolerationsNotMatch             = newPredicateFailureError("PodToleratesNodeTaints")
	ErrPodNotMatchHostName                   = newPredicateFailureError("HostName")
	ErrPodNotFitsHostPorts                   = newPredicateFailureError("PodFitsHostPorts")
	ErrNodeLabelPresenceViolated             = newPredicateFailureError("CheckNodeLabelPresence")
	ErrServiceAffinityViolated               = newPredicateFailureError("CheckServiceAffinity")
	ErrMaxVolumeCountExceeded                = newPredicateFailureError("MaxVolumeCount")
	ErrNodeUnderMemoryPressure               = newPredicateFailureError("NodeUnderMemoryPressure")
	ErrNodeUnderDiskPressure                 = newPredicateFailureError("NodeUnderDiskPressure")
	ErrNodeOutOfDisk                         = newPredicateFailureError("NodeOutOfDisk")
	ErrNodeNotReady                          = newPredicateFailureError("NodeNotReady")
	ErrNodeNetworkUnavailable                = newPredicateFailureError("NodeNetworkUnavailable")
	ErrNodeUnschedulable                     = newPredicateFailureError("NodeUnschedulable")
	ErrNodeUnknownCondition                  = newPredicateFailureError("NodeUnknownCondition")
	ErrVolumeNodeConflict                    = newPredicateFailureError("NoVolumeNodeConflict")
	// ErrFakePredicate is used for test only. The fake predicates returning false also returns error
	// as ErrFakePredicate.
	ErrFakePredicate = newPredicateFailureError("FakePredicateError")
)

Functions

func AddUnsetLabelsToMap 

func AddUnsetLabelsToMap(aL map[string]string, labelsToAdd []string, labelSet labels.Set)

AddUnsetLabelsToMap backfills missing values with values we find in a map.

func CheckNodeConditionPredicate 

func CheckNodeConditionPredicate(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

CheckNodeConditionPredicate checks if a pod can be scheduled on a node reporting out of disk, network unavailable and not ready condition. Only node conditions are accounted in this predicate.

func CheckNodeDiskPressurePredicate 

func CheckNodeDiskPressurePredicate(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

CheckNodeDiskPressurePredicate checks if a pod can be scheduled on a node reporting disk pressure condition.

func CheckNodeMemoryPressurePredicate 

func CheckNodeMemoryPressurePredicate(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

CheckNodeMemoryPressurePredicate checks if a pod can be scheduled on a node reporting memory pressure condition.

func CreateSelectorFromLabels 

func CreateSelectorFromLabels(aL map[string]string) labels.Selector

CreateSelectorFromLabels is used to define a selector that corresponds to the keys in a map.

func EssentialPredicates 

func EssentialPredicates(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

EssentialPredicates are the predicates that all pods, including critical pods, need

func FilterPodsByNamespace 

func FilterPodsByNamespace(pods []*v1.Pod, ns string) []*v1.Pod

FilterPodsByNamespace filters pods outside a namespace from the given list.

func FindLabelsInSet 

func FindLabelsInSet(labelsToKeep []string, selector labels.Set) map[string]string

FindLabelsInSet gets as many key/value pairs as possible out of a label set.

Example

ExampleUtils is a https://blog.golang.org/examples styled unit test. 

labelSubset := labels.Set{}
labelSubset["label1"] = "value1"
labelSubset["label2"] = "value2"
// Lets make believe that these pods are on the cluster.
// Utility functions will inspect their labels, filter them, and so on.
nsPods := []*v1.Pod{
	{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "pod1",
			Namespace: "ns1",
			Labels: map[string]string{
				"label1": "wontSeeThis",
				"label2": "wontSeeThis",
				"label3": "will_see_this",
			},
		},
	}, // first pod which will be used via the utilities
	{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "pod2",
			Namespace: "ns1",
		},
	},

	{
		ObjectMeta: metav1.ObjectMeta{
			Name: "pod3ThatWeWontSee",
		},
	},
}
fmt.Println(FindLabelsInSet([]string{"label1", "label2", "label3"}, nsPods[0].ObjectMeta.Labels)["label3"])
AddUnsetLabelsToMap(labelSubset, []string{"label1", "label2", "label3"}, nsPods[0].ObjectMeta.Labels)
fmt.Println(labelSubset)

for _, pod := range FilterPodsByNamespace(nsPods, "ns1") {
	fmt.Print(pod.Name, ",")
}

Output:

will_see_this
label1=value1,label2=value2,label3=will_see_this
pod1,pod2,

func GeneralPredicates 

func GeneralPredicates(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

GeneralPredicates checks whether noncriticalPredicates and EssentialPredicates pass. noncriticalPredicates are the predicates that only non-critical pods need and EssentialPredicates are the predicates that all pods, including critical pods, need

func GetEquivalencePod 

func GetEquivalencePod(pod *v1.Pod) interface{}

GetEquivalencePod returns a EquivalencePod which contains a group of pod attributes which can be reused.

func GetResourceRequest 

func GetResourceRequest(pod *v1.Pod) *schedulercache.Resource

GetResourceRequest returns a *schedulercache.Resource that covers the largest width in each resource dimension. Because init-containers run sequentially, we collect the max in each dimension iteratively. In contrast, we sum the resource vectors for regular containers since they run simultaneously.

Example:

Pod: 

InitContainers
  IC1:
    CPU: 2
    Memory: 1G
  IC2:
    CPU: 2
    Memory: 3G
Containers
  C1:
    CPU: 2
    Memory: 1G
  C2:
    CPU: 1
    Memory: 1G

Result: CPU: 3, Memory: 3G

func NewMaxPDVolumeCountPredicate 

func NewMaxPDVolumeCountPredicate(filterName string, pvInfo PersistentVolumeInfo, pvcInfo PersistentVolumeClaimInfo) algorithm.FitPredicate

NewMaxPDVolumeCountPredicate creates a predicate which evaluates whether a pod can fit based on the number of volumes which match a filter that it requests, and those that are already present.

The predicate looks for both volumes used directly, as well as PVC volumes that are backed by relevant volume types, counts the number of unique volumes, and rejects the new pod if it would place the total count over the maximum.

func NewNodeLabelPredicate 

func NewNodeLabelPredicate(labels []string, presence bool) algorithm.FitPredicate

func NewPodAffinityPredicate 

func NewPodAffinityPredicate(info NodeInfo, podLister algorithm.PodLister) algorithm.FitPredicate

func NewPredicateMetadataFactory 

func NewPredicateMetadataFactory(podLister algorithm.PodLister) algorithm.PredicateMetadataProducer

func NewVolumeNodePredicate 

func NewVolumeNodePredicate(pvInfo PersistentVolumeInfo, pvcInfo PersistentVolumeClaimInfo, client clientset.Interface) algorithm.FitPredicate

NewVolumeNodePredicate evaluates if a pod can fit due to the volumes it requests, given that some volumes have node topology constraints, particularly when using Local PVs. The requirement is that any pod that uses a PVC that is bound to a PV with topology constraints must be scheduled to a node that satisfies the PV's topology labels.

func NewVolumeZonePredicate 

func NewVolumeZonePredicate(pvInfo PersistentVolumeInfo, pvcInfo PersistentVolumeClaimInfo) algorithm.FitPredicate

NewVolumeZonePredicate evaluates if a pod can fit due to the volumes it requests, given that some volumes may have zone scheduling constraints. The requirement is that any volume zone-labels must match the equivalent zone-labels on the node. It is OK for the node to have more zone-label constraints (for example, a hypothetical replicated volume might allow region-wide access)

Currently this is only supported with PersistentVolumeClaims, and looks to the labels only on the bound PersistentVolume.

Working with volumes declared inline in the pod specification (i.e. not using a PersistentVolume) is likely to be harder, as it would require determining the zone of a volume during scheduling, and that is likely to require calling out to the cloud provider. It seems that we are moving away from inline volume declarations anyway.

func NoDiskConflict 

func NoDiskConflict(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

NoDiskConflict evaluates if a pod can fit due to the volumes it requests, and those that are already mounted. If there is already a volume mounted on that node, another pod that uses the same volume can't be scheduled there. This is GCE, Amazon EBS, and Ceph RBD specific for now: - GCE PD allows multiple mounts as long as they're all read-only - AWS EBS forbids any two pods mounting the same volume ID - Ceph RBD forbids if any two pods share at least same monitor, and match pool and image. - ISCSI forbids if any two pods share at least same IQN, LUN and Target TODO: migrate this into some per-volume specific code?

func PodFitsHost 

func PodFitsHost(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodFitsHost checks if a pod spec node name matches the current node.

func PodFitsHostPorts 

func PodFitsHostPorts(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodFitsHostPorts checks if a node has free ports for the requested pod ports.

func PodFitsResources 

func PodFitsResources(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodFitsResources checks if a node has sufficient resources, such as cpu, memory, gpu, opaque int resources etc to run a pod. First return value indicates whether a node has sufficient resources to run a pod while the second return value indicates the predicate failure reasons if the node has insufficient resources to run the pod.

func PodMatchNodeSelector 

func PodMatchNodeSelector(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodMatchNodeSelector checks if a pod node selector matches the node label.

func PodToleratesNodeNoExecuteTaints 

func PodToleratesNodeNoExecuteTaints(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodToleratesNodeNoExecuteTaints checks if a pod tolerations can tolerate the node's NoExecute taints

func PodToleratesNodeTaints 

func PodToleratesNodeTaints(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

PodToleratesNodeTaints checks if a pod tolerations can tolerate the node taints

func RegisterPredicateMetadataProducer 

func RegisterPredicateMetadataProducer(predicateName string, precomp PredicateMetadataProducer)

Types

type CachedNodeInfo 

type CachedNodeInfo struct {
	corelisters.NodeLister
}

func (*CachedNodeInfo) GetNodeInfo 

func (c *CachedNodeInfo) GetNodeInfo(id string) (*v1.Node, error)

GetNodeInfo returns cached data for the node 'id'.

type CachedPersistentVolumeClaimInfo 

type CachedPersistentVolumeClaimInfo struct {
	corelisters.PersistentVolumeClaimLister
}

CachedPersistentVolumeClaimInfo implements PersistentVolumeClaimInfo

func (*CachedPersistentVolumeClaimInfo) GetPersistentVolumeClaimInfo 

func (c *CachedPersistentVolumeClaimInfo) GetPersistentVolumeClaimInfo(namespace string, name string) (*v1.PersistentVolumeClaim, error)

GetPersistentVolumeClaimInfo fetches the claim in specified namespace with specified name

type CachedPersistentVolumeInfo 

type CachedPersistentVolumeInfo struct {
	corelisters.PersistentVolumeLister
}

CachedPersistentVolumeInfo implements PersistentVolumeInfo

func (*CachedPersistentVolumeInfo) GetPersistentVolumeInfo 

func (c *CachedPersistentVolumeInfo) GetPersistentVolumeInfo(pvID string) (*v1.PersistentVolume, error)

type EquivalencePod 

type EquivalencePod struct {
	ControllerRef metav1.OwnerReference
}

EquivalencePod is a group of pod attributes which can be reused as equivalence to schedule other pods.

type FailureReason 

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

func NewFailureReason 

func NewFailureReason(msg string) *FailureReason

func (*FailureReason) GetReason 

func (e *FailureReason) GetReason() string

type InsufficientResourceError 

type InsufficientResourceError struct {
	// resourceName is the name of the resource that is insufficient
	ResourceName v1.ResourceName
	// contains filtered or unexported fields
}

InsufficientResourceError is an error type that indicates what kind of resource limit is hit and caused the unfitting failure.

func NewInsufficientResourceError 

func NewInsufficientResourceError(resourceName v1.ResourceName, requested, used, capacity int64) *InsufficientResourceError

func (*InsufficientResourceError) Error 

func (e *InsufficientResourceError) Error() string

func (*InsufficientResourceError) GetInsufficientAmount 

func (e *InsufficientResourceError) GetInsufficientAmount() int64

func (*InsufficientResourceError) GetReason 

func (e *InsufficientResourceError) GetReason() string

type MaxPDVolumeCountChecker 

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

type NodeInfo 

type NodeInfo interface {
	GetNodeInfo(nodeID string) (*v1.Node, error)
}

NodeInfo: Other types for predicate functions...

type NodeLabelChecker 

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

func (*NodeLabelChecker) CheckNodeLabelPresence 

func (n *NodeLabelChecker) CheckNodeLabelPresence(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

CheckNodeLabelPresence checks whether all of the specified labels exists on a node or not, regardless of their value If "presence" is false, then returns false if any of the requested labels matches any of the node's labels, otherwise returns true. If "presence" is true, then returns false if any of the requested labels does not match any of the node's labels, otherwise returns true.

Consider the cases where the nodes are placed in regions/zones/racks and these are identified by labels In some cases, it is required that only nodes that are part of ANY of the defined regions/zones/racks be selected

Alternately, eliminating nodes that have a certain label, regardless of value, is also useful A node may have a label with "retiring" as key and the date as the value and it may be desirable to avoid scheduling new pods on this node

type PersistentVolumeClaimInfo 

type PersistentVolumeClaimInfo interface {
	GetPersistentVolumeClaimInfo(namespace string, name string) (*v1.PersistentVolumeClaim, error)
}

type PersistentVolumeInfo 

type PersistentVolumeInfo interface {
	GetPersistentVolumeInfo(pvID string) (*v1.PersistentVolume, error)
}

type PodAffinityChecker 

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

func (*PodAffinityChecker) InterPodAffinityMatches 

func (c *PodAffinityChecker) InterPodAffinityMatches(pod *v1.Pod, meta algorithm.PredicateMetadata, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error)

InterPodAffinityMatches checks if a pod can be scheduled on the specified node with pod affinity/anti-affinity configuration. First return value indicates whether a pod can be scheduled on the specified node while the second return value indicates the predicate failure reasons if the pod cannot be scheduled on the specified node.

type PredicateFailureError 

type PredicateFailureError struct {
	PredicateName string
}

func (*PredicateFailureError) Error 

func (e *PredicateFailureError) Error() string

func (*PredicateFailureError) GetReason 

func (e *PredicateFailureError) GetReason() string

type PredicateMetadataFactory 

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

func (*PredicateMetadataFactory) GetMetadata 

func (pfactory *PredicateMetadataFactory) GetMetadata(pod *v1.Pod, nodeNameToInfoMap map[string]*schedulercache.NodeInfo) algorithm.PredicateMetadata

GetMetadata returns the predicateMetadata used which will be used by various predicates.

type PredicateMetadataProducer 

type PredicateMetadataProducer func(pm *predicateMetadata)

PredicateMetadataProducer: Helper types/variables...

func NewServiceAffinityPredicate 

func NewServiceAffinityPredicate(podLister algorithm.PodLister, serviceLister algorithm.ServiceLister, nodeInfo NodeInfo, labels []string) (algorithm.FitPredicate, PredicateMetadataProducer)

type ServiceAffinity 

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

type VolumeFilter 

type VolumeFilter struct {
	// Filter normal volumes
	FilterVolume           func(vol *v1.Volume) (id string, relevant bool)
	FilterPersistentVolume func(pv *v1.PersistentVolume) (id string, relevant bool)
}

VolumeFilter contains information on how to filter PD Volumes when checking PD Volume caps 

var AzureDiskVolumeFilter VolumeFilter = VolumeFilter{
	FilterVolume: func(vol *v1.Volume) (string, bool) {
		if vol.AzureDisk != nil {
			return vol.AzureDisk.DiskName, true
		}
		return "", false
	},

	FilterPersistentVolume: func(pv *v1.PersistentVolume) (string, bool) {
		if pv.Spec.AzureDisk != nil {
			return pv.Spec.AzureDisk.DiskName, true
		}
		return "", false
	},
}

AzureDiskVolumeFilter is a VolumeFilter for filtering Azure Disk Volumes 

var EBSVolumeFilter VolumeFilter = VolumeFilter{
	FilterVolume: func(vol *v1.Volume) (string, bool) {
		if vol.AWSElasticBlockStore != nil {
			return vol.AWSElasticBlockStore.VolumeID, true
		}
		return "", false
	},

	FilterPersistentVolume: func(pv *v1.PersistentVolume) (string, bool) {
		if pv.Spec.AWSElasticBlockStore != nil {
			return pv.Spec.AWSElasticBlockStore.VolumeID, true
		}
		return "", false
	},
}

EBSVolumeFilter is a VolumeFilter for filtering AWS ElasticBlockStore Volumes 

var GCEPDVolumeFilter VolumeFilter = VolumeFilter{
	FilterVolume: func(vol *v1.Volume) (string, bool) {
		if vol.GCEPersistentDisk != nil {
			return vol.GCEPersistentDisk.PDName, true
		}
		return "", false
	},

	FilterPersistentVolume: func(pv *v1.PersistentVolume) (string, bool) {
		if pv.Spec.GCEPersistentDisk != nil {
			return pv.Spec.GCEPersistentDisk.PDName, true
		}
		return "", false
	},
}

GCEPDVolumeFilter is a VolumeFilter for filtering GCE PersistentDisk Volumes

type VolumeNodeChecker 

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

type VolumeZoneChecker 

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

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