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predicates.go
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/*
Copyright 2014 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 predicates
import (
"errors"
"fmt"
"os"
"regexp"
"strconv"
"k8s.io/klog"
"k8s.io/api/core/v1"
storagev1 "k8s.io/api/storage/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/rand"
"k8s.io/apimachinery/pkg/util/sets"
utilfeature "k8s.io/apiserver/pkg/util/feature"
corelisters "k8s.io/client-go/listers/core/v1"
storagelisters "k8s.io/client-go/listers/storage/v1"
volumehelpers "k8s.io/cloud-provider/volume/helpers"
v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
v1qos "k8s.io/kubernetes/pkg/apis/core/v1/helper/qos"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/scheduler/algorithm"
priorityutil "k8s.io/kubernetes/pkg/scheduler/algorithm/priorities/util"
schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
schedutil "k8s.io/kubernetes/pkg/scheduler/util"
"k8s.io/kubernetes/pkg/scheduler/volumebinder"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
const (
// MatchInterPodAffinityPred defines the name of predicate MatchInterPodAffinity.
MatchInterPodAffinityPred = "MatchInterPodAffinity"
// CheckVolumeBindingPred defines the name of predicate CheckVolumeBinding.
CheckVolumeBindingPred = "CheckVolumeBinding"
// CheckNodeConditionPred defines the name of predicate CheckNodeCondition.
CheckNodeConditionPred = "CheckNodeCondition"
// GeneralPred defines the name of predicate GeneralPredicates.
GeneralPred = "GeneralPredicates"
// HostNamePred defines the name of predicate HostName.
HostNamePred = "HostName"
// PodFitsHostPortsPred defines the name of predicate PodFitsHostPorts.
PodFitsHostPortsPred = "PodFitsHostPorts"
// MatchNodeSelectorPred defines the name of predicate MatchNodeSelector.
MatchNodeSelectorPred = "MatchNodeSelector"
// PodFitsResourcesPred defines the name of predicate PodFitsResources.
PodFitsResourcesPred = "PodFitsResources"
// NoDiskConflictPred defines the name of predicate NoDiskConflict.
NoDiskConflictPred = "NoDiskConflict"
// PodToleratesNodeTaintsPred defines the name of predicate PodToleratesNodeTaints.
PodToleratesNodeTaintsPred = "PodToleratesNodeTaints"
// CheckNodeUnschedulablePred defines the name of predicate CheckNodeUnschedulablePredicate.
CheckNodeUnschedulablePred = "CheckNodeUnschedulable"
// PodToleratesNodeNoExecuteTaintsPred defines the name of predicate PodToleratesNodeNoExecuteTaints.
PodToleratesNodeNoExecuteTaintsPred = "PodToleratesNodeNoExecuteTaints"
// CheckNodeLabelPresencePred defines the name of predicate CheckNodeLabelPresence.
CheckNodeLabelPresencePred = "CheckNodeLabelPresence"
// CheckServiceAffinityPred defines the name of predicate checkServiceAffinity.
CheckServiceAffinityPred = "CheckServiceAffinity"
// MaxEBSVolumeCountPred defines the name of predicate MaxEBSVolumeCount.
// DEPRECATED
// All cloudprovider specific predicates are deprecated in favour of MaxCSIVolumeCountPred.
MaxEBSVolumeCountPred = "MaxEBSVolumeCount"
// MaxGCEPDVolumeCountPred defines the name of predicate MaxGCEPDVolumeCount.
// DEPRECATED
// All cloudprovider specific predicates are deprecated in favour of MaxCSIVolumeCountPred.
MaxGCEPDVolumeCountPred = "MaxGCEPDVolumeCount"
// MaxAzureDiskVolumeCountPred defines the name of predicate MaxAzureDiskVolumeCount.
// DEPRECATED
// All cloudprovider specific predicates are deprecated in favour of MaxCSIVolumeCountPred.
MaxAzureDiskVolumeCountPred = "MaxAzureDiskVolumeCount"
// MaxCinderVolumeCountPred defines the name of predicate MaxCinderDiskVolumeCount.
// DEPRECATED
// All cloudprovider specific predicates are deprecated in favour of MaxCSIVolumeCountPred.
MaxCinderVolumeCountPred = "MaxCinderVolumeCount"
// MaxCSIVolumeCountPred defines the predicate that decides how many CSI volumes should be attached
MaxCSIVolumeCountPred = "MaxCSIVolumeCountPred"
// NoVolumeZoneConflictPred defines the name of predicate NoVolumeZoneConflict.
NoVolumeZoneConflictPred = "NoVolumeZoneConflict"
// CheckNodeMemoryPressurePred defines the name of predicate CheckNodeMemoryPressure.
CheckNodeMemoryPressurePred = "CheckNodeMemoryPressure"
// CheckNodeDiskPressurePred defines the name of predicate CheckNodeDiskPressure.
CheckNodeDiskPressurePred = "CheckNodeDiskPressure"
// CheckNodePIDPressurePred defines the name of predicate CheckNodePIDPressure.
CheckNodePIDPressurePred = "CheckNodePIDPressure"
// 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"
// EBSVolumeFilterType defines the filter name for EBSVolumeFilter.
EBSVolumeFilterType = "EBS"
// GCEPDVolumeFilterType defines the filter name for GCEPDVolumeFilter.
GCEPDVolumeFilterType = "GCE"
// AzureDiskVolumeFilterType defines the filter name for AzureDiskVolumeFilter.
AzureDiskVolumeFilterType = "AzureDisk"
// CinderVolumeFilterType defines the filter name for CinderVolumeFilter.
CinderVolumeFilterType = "Cinder"
)
// IMPORTANT NOTE for predicate developers:
// We are using cached predicate result for pods belonging to the same equivalence class.
// So when updating an existing predicate, you should consider whether your change will introduce new
// dependency to attributes of any API object like Pod, Node, Service etc.
// If yes, you are expected to invalidate the cached predicate result for related API object change.
// For example:
// https://github.com/kubernetes/kubernetes/blob/36a218e/plugin/pkg/scheduler/factory/factory.go#L422
// IMPORTANT NOTE: this list contains the ordering of the predicates, if you develop a new predicate
// it is mandatory to add its name to this list.
// Otherwise it won't be processed, see generic_scheduler#podFitsOnNode().
// The order is based on the restrictiveness & complexity of predicates.
// Design doc: https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/predicates-ordering.md
var (
predicatesOrdering = []string{CheckNodeConditionPred, CheckNodeUnschedulablePred,
GeneralPred, HostNamePred, PodFitsHostPortsPred,
MatchNodeSelectorPred, PodFitsResourcesPred, NoDiskConflictPred,
PodToleratesNodeTaintsPred, PodToleratesNodeNoExecuteTaintsPred, CheckNodeLabelPresencePred,
CheckServiceAffinityPred, MaxEBSVolumeCountPred, MaxGCEPDVolumeCountPred, MaxCSIVolumeCountPred,
MaxAzureDiskVolumeCountPred, MaxCinderVolumeCountPred, CheckVolumeBindingPred, NoVolumeZoneConflictPred,
CheckNodeMemoryPressurePred, CheckNodePIDPressurePred, CheckNodeDiskPressurePred, MatchInterPodAffinityPred}
)
// FitPredicate is a function that indicates if a pod fits into an existing node.
// The failure information is given by the error.
type FitPredicate func(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error)
// NodeInfo interface represents anything that can get node object from node ID.
type NodeInfo interface {
GetNodeInfo(nodeID string) (*v1.Node, error)
}
// PersistentVolumeInfo interface represents anything that can get persistent volume object by PV ID.
type PersistentVolumeInfo interface {
GetPersistentVolumeInfo(pvID string) (*v1.PersistentVolume, error)
}
// CachedPersistentVolumeInfo implements PersistentVolumeInfo
type CachedPersistentVolumeInfo struct {
corelisters.PersistentVolumeLister
}
// Ordering returns the ordering of predicates.
func Ordering() []string {
return predicatesOrdering
}
// SetPredicatesOrdering sets the ordering of predicates.
func SetPredicatesOrdering(names []string) {
predicatesOrdering = names
}
// GetPersistentVolumeInfo returns a persistent volume object by PV ID.
func (c *CachedPersistentVolumeInfo) GetPersistentVolumeInfo(pvID string) (*v1.PersistentVolume, error) {
return c.Get(pvID)
}
// PersistentVolumeClaimInfo interface represents anything that can get a PVC object in
// specified namespace with specified name.
type PersistentVolumeClaimInfo interface {
GetPersistentVolumeClaimInfo(namespace string, name string) (*v1.PersistentVolumeClaim, error)
}
// CachedPersistentVolumeClaimInfo implements PersistentVolumeClaimInfo
type CachedPersistentVolumeClaimInfo struct {
corelisters.PersistentVolumeClaimLister
}
// GetPersistentVolumeClaimInfo fetches the claim in specified namespace with specified name
func (c *CachedPersistentVolumeClaimInfo) GetPersistentVolumeClaimInfo(namespace string, name string) (*v1.PersistentVolumeClaim, error) {
return c.PersistentVolumeClaims(namespace).Get(name)
}
// CachedNodeInfo implements NodeInfo
type CachedNodeInfo struct {
corelisters.NodeLister
}
// GetNodeInfo returns cached data for the node 'id'.
func (c *CachedNodeInfo) GetNodeInfo(id string) (*v1.Node, error) {
node, err := c.Get(id)
if apierrors.IsNotFound(err) {
return nil, err
}
if err != nil {
return nil, fmt.Errorf("error retrieving node '%v' from cache: %v", id, err)
}
return node, nil
}
// StorageClassInfo interface represents anything that can get a storage class object by class name.
type StorageClassInfo interface {
GetStorageClassInfo(className string) (*storagev1.StorageClass, error)
}
// CachedStorageClassInfo implements StorageClassInfo
type CachedStorageClassInfo struct {
storagelisters.StorageClassLister
}
// GetStorageClassInfo get StorageClass by class name.
func (c *CachedStorageClassInfo) GetStorageClassInfo(className string) (*storagev1.StorageClass, error) {
return c.Get(className)
}
func isVolumeConflict(volume v1.Volume, pod *v1.Pod) bool {
// fast path if there is no conflict checking targets.
if volume.GCEPersistentDisk == nil && volume.AWSElasticBlockStore == nil && volume.RBD == nil && volume.ISCSI == nil {
return false
}
for _, existingVolume := range pod.Spec.Volumes {
// Same GCE disk mounted by multiple pods conflicts unless all pods mount it read-only.
if volume.GCEPersistentDisk != nil && existingVolume.GCEPersistentDisk != nil {
disk, existingDisk := volume.GCEPersistentDisk, existingVolume.GCEPersistentDisk
if disk.PDName == existingDisk.PDName && !(disk.ReadOnly && existingDisk.ReadOnly) {
return true
}
}
if volume.AWSElasticBlockStore != nil && existingVolume.AWSElasticBlockStore != nil {
if volume.AWSElasticBlockStore.VolumeID == existingVolume.AWSElasticBlockStore.VolumeID {
return true
}
}
if volume.ISCSI != nil && existingVolume.ISCSI != nil {
iqn := volume.ISCSI.IQN
eiqn := existingVolume.ISCSI.IQN
// two ISCSI volumes are same, if they share the same iqn. As iscsi volumes are of type
// RWO or ROX, we could permit only one RW mount. Same iscsi volume mounted by multiple Pods
// conflict unless all other pods mount as read only.
if iqn == eiqn && !(volume.ISCSI.ReadOnly && existingVolume.ISCSI.ReadOnly) {
return true
}
}
if volume.RBD != nil && existingVolume.RBD != nil {
mon, pool, image := volume.RBD.CephMonitors, volume.RBD.RBDPool, volume.RBD.RBDImage
emon, epool, eimage := existingVolume.RBD.CephMonitors, existingVolume.RBD.RBDPool, existingVolume.RBD.RBDImage
// two RBDs images are the same if they share the same Ceph monitor, are in the same RADOS Pool, and have the same image name
// only one read-write mount is permitted for the same RBD image.
// same RBD image mounted by multiple Pods conflicts unless all Pods mount the image read-only
if haveOverlap(mon, emon) && pool == epool && image == eimage && !(volume.RBD.ReadOnly && existingVolume.RBD.ReadOnly) {
return true
}
}
}
return false
}
// 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 NoDiskConflict(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
for _, v := range pod.Spec.Volumes {
for _, ev := range nodeInfo.Pods() {
if isVolumeConflict(v, ev) {
return false, []PredicateFailureReason{ErrDiskConflict}, nil
}
}
}
return true, nil, nil
}
// MaxPDVolumeCountChecker contains information to check the max number of volumes for a predicate.
type MaxPDVolumeCountChecker struct {
filter VolumeFilter
volumeLimitKey v1.ResourceName
maxVolumeFunc func(node *v1.Node) int
pvInfo PersistentVolumeInfo
pvcInfo PersistentVolumeClaimInfo
// The string below is generated randomly during the struct's initialization.
// It is used to prefix volumeID generated inside the predicate() method to
// avoid conflicts with any real volume.
randomVolumeIDPrefix string
}
// VolumeFilter contains information on how to filter PD Volumes when checking PD Volume caps
type VolumeFilter struct {
// Filter normal volumes
FilterVolume func(vol *v1.Volume) (id string, relevant bool)
FilterPersistentVolume func(pv *v1.PersistentVolume) (id string, relevant bool)
}
// 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.
//
// DEPRECATED
// All cloudprovider specific predicates defined here are deprecated in favour of CSI volume limit
// predicate - MaxCSIVolumeCountPred.
//
// 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 NewMaxPDVolumeCountPredicate(
filterName string, pvInfo PersistentVolumeInfo, pvcInfo PersistentVolumeClaimInfo) FitPredicate {
var filter VolumeFilter
var volumeLimitKey v1.ResourceName
switch filterName {
case EBSVolumeFilterType:
filter = EBSVolumeFilter
volumeLimitKey = v1.ResourceName(volumeutil.EBSVolumeLimitKey)
case GCEPDVolumeFilterType:
filter = GCEPDVolumeFilter
volumeLimitKey = v1.ResourceName(volumeutil.GCEVolumeLimitKey)
case AzureDiskVolumeFilterType:
filter = AzureDiskVolumeFilter
volumeLimitKey = v1.ResourceName(volumeutil.AzureVolumeLimitKey)
case CinderVolumeFilterType:
filter = CinderVolumeFilter
volumeLimitKey = v1.ResourceName(volumeutil.CinderVolumeLimitKey)
default:
klog.Fatalf("Wrong filterName, Only Support %v %v %v ", EBSVolumeFilterType,
GCEPDVolumeFilterType, AzureDiskVolumeFilterType)
return nil
}
c := &MaxPDVolumeCountChecker{
filter: filter,
volumeLimitKey: volumeLimitKey,
maxVolumeFunc: getMaxVolumeFunc(filterName),
pvInfo: pvInfo,
pvcInfo: pvcInfo,
randomVolumeIDPrefix: rand.String(32),
}
return c.predicate
}
func getMaxVolumeFunc(filterName string) func(node *v1.Node) int {
return func(node *v1.Node) int {
maxVolumesFromEnv := getMaxVolLimitFromEnv()
if maxVolumesFromEnv > 0 {
return maxVolumesFromEnv
}
var nodeInstanceType string
for k, v := range node.ObjectMeta.Labels {
if k == v1.LabelInstanceType {
nodeInstanceType = v
}
}
switch filterName {
case EBSVolumeFilterType:
return getMaxEBSVolume(nodeInstanceType)
case GCEPDVolumeFilterType:
return DefaultMaxGCEPDVolumes
case AzureDiskVolumeFilterType:
return DefaultMaxAzureDiskVolumes
case CinderVolumeFilterType:
return volumeutil.DefaultMaxCinderVolumes
default:
return -1
}
}
}
func getMaxEBSVolume(nodeInstanceType string) int {
if ok, _ := regexp.MatchString(volumeutil.EBSNitroLimitRegex, nodeInstanceType); ok {
return volumeutil.DefaultMaxEBSNitroVolumeLimit
}
return volumeutil.DefaultMaxEBSVolumes
}
// getMaxVolLimitFromEnv checks the max PD volumes environment variable, otherwise returning a default value
func getMaxVolLimitFromEnv() int {
if rawMaxVols := os.Getenv(KubeMaxPDVols); rawMaxVols != "" {
if parsedMaxVols, err := strconv.Atoi(rawMaxVols); err != nil {
klog.Errorf("Unable to parse maximum PD volumes value, using default: %v", err)
} else if parsedMaxVols <= 0 {
klog.Errorf("Maximum PD volumes must be a positive value, using default ")
} else {
return parsedMaxVols
}
}
return -1
}
func (c *MaxPDVolumeCountChecker) filterVolumes(volumes []v1.Volume, namespace string, filteredVolumes map[string]bool) error {
for i := range volumes {
vol := &volumes[i]
if id, ok := c.filter.FilterVolume(vol); ok {
filteredVolumes[id] = true
} else if vol.PersistentVolumeClaim != nil {
pvcName := vol.PersistentVolumeClaim.ClaimName
if pvcName == "" {
return fmt.Errorf("PersistentVolumeClaim had no name")
}
// Until we know real ID of the volume use namespace/pvcName as substitute
// with a random prefix (calculated and stored inside 'c' during initialization)
// to avoid conflicts with existing volume IDs.
pvID := fmt.Sprintf("%s-%s/%s", c.randomVolumeIDPrefix, namespace, pvcName)
pvc, err := c.pvcInfo.GetPersistentVolumeClaimInfo(namespace, pvcName)
if err != nil || pvc == nil {
// if the PVC is not found, log the error and count the PV towards the PV limit
klog.V(4).Infof("Unable to look up PVC info for %s/%s, assuming PVC matches predicate when counting limits: %v", namespace, pvcName, err)
filteredVolumes[pvID] = true
continue
}
pvName := pvc.Spec.VolumeName
if pvName == "" {
// PVC is not bound. It was either deleted and created again or
// it was forcefully unbound by admin. The pod can still use the
// original PV where it was bound to -> log the error and count
// the PV towards the PV limit
klog.V(4).Infof("PVC %s/%s is not bound, assuming PVC matches predicate when counting limits", namespace, pvcName)
filteredVolumes[pvID] = true
continue
}
pv, err := c.pvInfo.GetPersistentVolumeInfo(pvName)
if err != nil || pv == nil {
// if the PV is not found, log the error
// and count the PV towards the PV limit
klog.V(4).Infof("Unable to look up PV info for %s/%s/%s, assuming PV matches predicate when counting limits: %v", namespace, pvcName, pvName, err)
filteredVolumes[pvID] = true
continue
}
if id, ok := c.filter.FilterPersistentVolume(pv); ok {
filteredVolumes[id] = true
}
}
}
return nil
}
func (c *MaxPDVolumeCountChecker) predicate(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
// If a pod doesn't have any volume attached to it, the predicate will always be true.
// Thus we make a fast path for it, to avoid unnecessary computations in this case.
if len(pod.Spec.Volumes) == 0 {
return true, nil, nil
}
newVolumes := make(map[string]bool)
if err := c.filterVolumes(pod.Spec.Volumes, pod.Namespace, newVolumes); err != nil {
return false, nil, err
}
// quick return
if len(newVolumes) == 0 {
return true, nil, nil
}
// count unique volumes
existingVolumes := make(map[string]bool)
for _, existingPod := range nodeInfo.Pods() {
if err := c.filterVolumes(existingPod.Spec.Volumes, existingPod.Namespace, existingVolumes); err != nil {
return false, nil, err
}
}
numExistingVolumes := len(existingVolumes)
// filter out already-mounted volumes
for k := range existingVolumes {
if _, ok := newVolumes[k]; ok {
delete(newVolumes, k)
}
}
numNewVolumes := len(newVolumes)
maxAttachLimit := c.maxVolumeFunc(nodeInfo.Node())
if utilfeature.DefaultFeatureGate.Enabled(features.AttachVolumeLimit) {
volumeLimits := nodeInfo.VolumeLimits()
if maxAttachLimitFromAllocatable, ok := volumeLimits[c.volumeLimitKey]; ok {
maxAttachLimit = int(maxAttachLimitFromAllocatable)
}
}
if numExistingVolumes+numNewVolumes > maxAttachLimit {
// violates MaxEBSVolumeCount or MaxGCEPDVolumeCount
return false, []PredicateFailureReason{ErrMaxVolumeCountExceeded}, nil
}
if nodeInfo != nil && nodeInfo.TransientInfo != nil && utilfeature.DefaultFeatureGate.Enabled(features.BalanceAttachedNodeVolumes) {
nodeInfo.TransientInfo.TransientLock.Lock()
defer nodeInfo.TransientInfo.TransientLock.Unlock()
nodeInfo.TransientInfo.TransNodeInfo.AllocatableVolumesCount = maxAttachLimit - numExistingVolumes
nodeInfo.TransientInfo.TransNodeInfo.RequestedVolumes = numNewVolumes
}
return true, nil, nil
}
// EBSVolumeFilter is a VolumeFilter for filtering AWS ElasticBlockStore Volumes
var EBSVolumeFilter = 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
},
}
// GCEPDVolumeFilter is a VolumeFilter for filtering GCE PersistentDisk Volumes
var GCEPDVolumeFilter = 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
},
}
// AzureDiskVolumeFilter is a VolumeFilter for filtering Azure Disk Volumes
var AzureDiskVolumeFilter = 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
},
}
// CinderVolumeFilter is a VolumeFilter for filtering Cinder Volumes
// It will be deprecated once Openstack cloudprovider has been removed from in-tree.
var CinderVolumeFilter = VolumeFilter{
FilterVolume: func(vol *v1.Volume) (string, bool) {
if vol.Cinder != nil {
return vol.Cinder.VolumeID, true
}
return "", false
},
FilterPersistentVolume: func(pv *v1.PersistentVolume) (string, bool) {
if pv.Spec.Cinder != nil {
return pv.Spec.Cinder.VolumeID, true
}
return "", false
},
}
// VolumeZoneChecker contains information to check the volume zone for a predicate.
type VolumeZoneChecker struct {
pvInfo PersistentVolumeInfo
pvcInfo PersistentVolumeClaimInfo
classInfo StorageClassInfo
}
// 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 NewVolumeZonePredicate(pvInfo PersistentVolumeInfo, pvcInfo PersistentVolumeClaimInfo, classInfo StorageClassInfo) FitPredicate {
c := &VolumeZoneChecker{
pvInfo: pvInfo,
pvcInfo: pvcInfo,
classInfo: classInfo,
}
return c.predicate
}
func (c *VolumeZoneChecker) predicate(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
// If a pod doesn't have any volume attached to it, the predicate will always be true.
// Thus we make a fast path for it, to avoid unnecessary computations in this case.
if len(pod.Spec.Volumes) == 0 {
return true, nil, nil
}
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
nodeConstraints := make(map[string]string)
for k, v := range node.ObjectMeta.Labels {
if k != v1.LabelZoneFailureDomain && k != v1.LabelZoneRegion {
continue
}
nodeConstraints[k] = v
}
if len(nodeConstraints) == 0 {
// The node has no zone constraints, so we're OK to schedule.
// In practice, when using zones, all nodes must be labeled with zone labels.
// We want to fast-path this case though.
return true, nil, nil
}
namespace := pod.Namespace
manifest := &(pod.Spec)
for i := range manifest.Volumes {
volume := &manifest.Volumes[i]
if volume.PersistentVolumeClaim != nil {
pvcName := volume.PersistentVolumeClaim.ClaimName
if pvcName == "" {
return false, nil, fmt.Errorf("PersistentVolumeClaim had no name")
}
pvc, err := c.pvcInfo.GetPersistentVolumeClaimInfo(namespace, pvcName)
if err != nil {
return false, nil, err
}
if pvc == nil {
return false, nil, fmt.Errorf("PersistentVolumeClaim was not found: %q", pvcName)
}
pvName := pvc.Spec.VolumeName
if pvName == "" {
scName := v1helper.GetPersistentVolumeClaimClass(pvc)
if len(scName) > 0 {
class, _ := c.classInfo.GetStorageClassInfo(scName)
if class != nil {
if class.VolumeBindingMode == nil {
return false, nil, fmt.Errorf("VolumeBindingMode not set for StorageClass %q", scName)
}
if *class.VolumeBindingMode == storagev1.VolumeBindingWaitForFirstConsumer {
// Skip unbound volumes
continue
}
}
}
return false, nil, fmt.Errorf("PersistentVolumeClaim is not bound: %q", pvcName)
}
pv, err := c.pvInfo.GetPersistentVolumeInfo(pvName)
if err != nil {
return false, nil, err
}
if pv == nil {
return false, nil, fmt.Errorf("PersistentVolume not found: %q", pvName)
}
for k, v := range pv.ObjectMeta.Labels {
if k != v1.LabelZoneFailureDomain && k != v1.LabelZoneRegion {
continue
}
nodeV, _ := nodeConstraints[k]
volumeVSet, err := volumehelpers.LabelZonesToSet(v)
if err != nil {
klog.Warningf("Failed to parse label for %q: %q. Ignoring the label. err=%v. ", k, v, err)
continue
}
if !volumeVSet.Has(nodeV) {
klog.V(10).Infof("Won't schedule pod %q onto node %q due to volume %q (mismatch on %q)", pod.Name, node.Name, pvName, k)
return false, []PredicateFailureReason{ErrVolumeZoneConflict}, nil
}
}
}
}
return true, nil, nil
}
// GetResourceRequest returns a *schedulernodeinfo.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 GetResourceRequest(pod *v1.Pod) *schedulernodeinfo.Resource {
result := &schedulernodeinfo.Resource{}
for _, container := range pod.Spec.Containers {
result.Add(container.Resources.Requests)
}
// take max_resource(sum_pod, any_init_container)
for _, container := range pod.Spec.InitContainers {
result.SetMaxResource(container.Resources.Requests)
}
return result
}
func podName(pod *v1.Pod) string {
return pod.Namespace + "/" + pod.Name
}
// 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 PodFitsResources(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
var predicateFails []PredicateFailureReason
allowedPodNumber := nodeInfo.AllowedPodNumber()
if len(nodeInfo.Pods())+1 > allowedPodNumber {
predicateFails = append(predicateFails, NewInsufficientResourceError(v1.ResourcePods, 1, int64(len(nodeInfo.Pods())), int64(allowedPodNumber)))
}
// No extended resources should be ignored by default.
ignoredExtendedResources := sets.NewString()
var podRequest *schedulernodeinfo.Resource
if predicateMeta, ok := meta.(*predicateMetadata); ok {
podRequest = predicateMeta.podRequest
if predicateMeta.ignoredExtendedResources != nil {
ignoredExtendedResources = predicateMeta.ignoredExtendedResources
}
} else {
// We couldn't parse metadata - fallback to computing it.
podRequest = GetResourceRequest(pod)
}
if podRequest.MilliCPU == 0 &&
podRequest.Memory == 0 &&
podRequest.EphemeralStorage == 0 &&
len(podRequest.ScalarResources) == 0 {
return len(predicateFails) == 0, predicateFails, nil
}
allocatable := nodeInfo.AllocatableResource()
if allocatable.MilliCPU < podRequest.MilliCPU+nodeInfo.RequestedResource().MilliCPU {
predicateFails = append(predicateFails, NewInsufficientResourceError(v1.ResourceCPU, podRequest.MilliCPU, nodeInfo.RequestedResource().MilliCPU, allocatable.MilliCPU))
}
if allocatable.Memory < podRequest.Memory+nodeInfo.RequestedResource().Memory {
predicateFails = append(predicateFails, NewInsufficientResourceError(v1.ResourceMemory, podRequest.Memory, nodeInfo.RequestedResource().Memory, allocatable.Memory))
}
if allocatable.EphemeralStorage < podRequest.EphemeralStorage+nodeInfo.RequestedResource().EphemeralStorage {
predicateFails = append(predicateFails, NewInsufficientResourceError(v1.ResourceEphemeralStorage, podRequest.EphemeralStorage, nodeInfo.RequestedResource().EphemeralStorage, allocatable.EphemeralStorage))
}
for rName, rQuant := range podRequest.ScalarResources {
if v1helper.IsExtendedResourceName(rName) {
// If this resource is one of the extended resources that should be
// ignored, we will skip checking it.
if ignoredExtendedResources.Has(string(rName)) {
continue
}
}
if allocatable.ScalarResources[rName] < rQuant+nodeInfo.RequestedResource().ScalarResources[rName] {
predicateFails = append(predicateFails, NewInsufficientResourceError(rName, podRequest.ScalarResources[rName], nodeInfo.RequestedResource().ScalarResources[rName], allocatable.ScalarResources[rName]))
}
}
if klog.V(10) {
if len(predicateFails) == 0 {
// We explicitly don't do klog.V(10).Infof() to avoid computing all the parameters if this is
// not logged. There is visible performance gain from it.
klog.Infof("Schedule Pod %+v on Node %+v is allowed, Node is running only %v out of %v Pods.",
podName(pod), node.Name, len(nodeInfo.Pods()), allowedPodNumber)
}
}
return len(predicateFails) == 0, predicateFails, nil
}
// nodeMatchesNodeSelectorTerms checks if a node's labels satisfy a list of node selector terms,
// terms are ORed, and an empty list of terms will match nothing.
func nodeMatchesNodeSelectorTerms(node *v1.Node, nodeSelectorTerms []v1.NodeSelectorTerm) bool {
nodeFields := map[string]string{}
for k, f := range algorithm.NodeFieldSelectorKeys {
nodeFields[k] = f(node)
}
return v1helper.MatchNodeSelectorTerms(nodeSelectorTerms, labels.Set(node.Labels), fields.Set(nodeFields))
}
// podMatchesNodeSelectorAndAffinityTerms checks whether the pod is schedulable onto nodes according to
// the requirements in both NodeAffinity and nodeSelector.
func podMatchesNodeSelectorAndAffinityTerms(pod *v1.Pod, node *v1.Node) bool {
// Check if node.Labels match pod.Spec.NodeSelector.
if len(pod.Spec.NodeSelector) > 0 {
selector := labels.SelectorFromSet(pod.Spec.NodeSelector)
if !selector.Matches(labels.Set(node.Labels)) {
return false
}
}
// 1. nil NodeSelector matches all nodes (i.e. does not filter out any nodes)
// 2. nil []NodeSelectorTerm (equivalent to non-nil empty NodeSelector) matches no nodes
// 3. zero-length non-nil []NodeSelectorTerm matches no nodes also, just for simplicity
// 4. nil []NodeSelectorRequirement (equivalent to non-nil empty NodeSelectorTerm) matches no nodes
// 5. zero-length non-nil []NodeSelectorRequirement matches no nodes also, just for simplicity
// 6. non-nil empty NodeSelectorRequirement is not allowed
nodeAffinityMatches := true
affinity := pod.Spec.Affinity
if affinity != nil && affinity.NodeAffinity != nil {
nodeAffinity := affinity.NodeAffinity
// if no required NodeAffinity requirements, will do no-op, means select all nodes.
// TODO: Replace next line with subsequent commented-out line when implement RequiredDuringSchedulingRequiredDuringExecution.
if nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution == nil {
// if nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution == nil && nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution == nil {
return true
}
// Match node selector for requiredDuringSchedulingRequiredDuringExecution.
// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
// if nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution != nil {
// nodeSelectorTerms := nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution.NodeSelectorTerms
// klog.V(10).Infof("Match for RequiredDuringSchedulingRequiredDuringExecution node selector terms %+v", nodeSelectorTerms)
// nodeAffinityMatches = nodeMatchesNodeSelectorTerms(node, nodeSelectorTerms)
// }
// Match node selector for requiredDuringSchedulingIgnoredDuringExecution.
if nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution != nil {
nodeSelectorTerms := nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms
klog.V(10).Infof("Match for RequiredDuringSchedulingIgnoredDuringExecution node selector terms %+v", nodeSelectorTerms)
nodeAffinityMatches = nodeAffinityMatches && nodeMatchesNodeSelectorTerms(node, nodeSelectorTerms)
}
}
return nodeAffinityMatches
}
// PodMatchNodeSelector checks if a pod node selector matches the node label.
func PodMatchNodeSelector(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
if podMatchesNodeSelectorAndAffinityTerms(pod, node) {
return true, nil, nil
}
return false, []PredicateFailureReason{ErrNodeSelectorNotMatch}, nil
}
// PodFitsHost checks if a pod spec node name matches the current node.
func PodFitsHost(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
if len(pod.Spec.NodeName) == 0 {
return true, nil, nil
}
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
if pod.Spec.NodeName == node.Name {
return true, nil, nil
}
return false, []PredicateFailureReason{ErrPodNotMatchHostName}, nil
}
// NodeLabelChecker contains information to check node labels for a predicate.
type NodeLabelChecker struct {
labels []string
presence bool
}
// NewNodeLabelPredicate creates a predicate which evaluates whether a pod can fit based on the
// node labels which match a filter that it requests.
func NewNodeLabelPredicate(labels []string, presence bool) FitPredicate {
labelChecker := &NodeLabelChecker{
labels: labels,
presence: presence,
}
return labelChecker.CheckNodeLabelPresence
}
// 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
func (n *NodeLabelChecker) CheckNodeLabelPresence(pod *v1.Pod, meta PredicateMetadata, nodeInfo *schedulernodeinfo.NodeInfo) (bool, []PredicateFailureReason, error) {
node := nodeInfo.Node()
if node == nil {
return false, nil, fmt.Errorf("node not found")
}
var exists bool
nodeLabels := labels.Set(node.Labels)
for _, label := range n.labels {
exists = nodeLabels.Has(label)
if (exists && !n.presence) || (!exists && n.presence) {
return false, []PredicateFailureReason{ErrNodeLabelPresenceViolated}, nil
}
}
return true, nil, nil
}
// ServiceAffinity defines a struct used for creating service affinity predicates.
type ServiceAffinity struct {
podLister algorithm.PodLister
serviceLister algorithm.ServiceLister
nodeInfo NodeInfo
labels []string
}
// serviceAffinityMetadataProducer should be run once by the scheduler before looping through the Predicate. It is a helper function that
// only should be referenced by NewServiceAffinityPredicate.
func (s *ServiceAffinity) serviceAffinityMetadataProducer(pm *predicateMetadata) {
if pm.pod == nil {
klog.Errorf("Cannot precompute service affinity, a pod is required to calculate service affinity.")
return
}
pm.serviceAffinityInUse = true
var errSvc, errList error
// Store services which match the pod.
pm.serviceAffinityMatchingPodServices, errSvc = s.serviceLister.GetPodServices(pm.pod)
selector := CreateSelectorFromLabels(pm.pod.Labels)
allMatches, errList := s.podLister.List(selector)
// In the future maybe we will return them as part of the function.
if errSvc != nil || errList != nil {
klog.Errorf("Some Error were found while precomputing svc affinity: \nservices:%v , \npods:%v", errSvc, errList)
}
// consider only the pods that belong to the same namespace
pm.serviceAffinityMatchingPodList = FilterPodsByNamespace(allMatches, pm.pod.Namespace)
}
// NewServiceAffinityPredicate creates a ServiceAffinity.
func NewServiceAffinityPredicate(podLister algorithm.PodLister, serviceLister algorithm.ServiceLister, nodeInfo NodeInfo, labels []string) (FitPredicate, predicateMetadataProducer) {
affinity := &ServiceAffinity{
podLister: podLister,
serviceLister: serviceLister,
nodeInfo: nodeInfo,