mirror of https://github.com/k3s-io/k3s
274 lines
14 KiB
Go
274 lines
14 KiB
Go
/*
|
|
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 defaults
|
|
|
|
import (
|
|
"github.com/golang/glog"
|
|
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
utilfeature "k8s.io/apiserver/pkg/util/feature"
|
|
|
|
"k8s.io/kubernetes/pkg/features"
|
|
"k8s.io/kubernetes/pkg/scheduler/algorithm"
|
|
"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
|
|
"k8s.io/kubernetes/pkg/scheduler/algorithm/priorities"
|
|
"k8s.io/kubernetes/pkg/scheduler/core"
|
|
"k8s.io/kubernetes/pkg/scheduler/factory"
|
|
)
|
|
|
|
const (
|
|
// ClusterAutoscalerProvider defines the default autoscaler provider
|
|
ClusterAutoscalerProvider = "ClusterAutoscalerProvider"
|
|
)
|
|
|
|
func init() {
|
|
// Register functions that extract metadata used by predicates and priorities computations.
|
|
factory.RegisterPredicateMetadataProducerFactory(
|
|
func(args factory.PluginFactoryArgs) algorithm.PredicateMetadataProducer {
|
|
return predicates.NewPredicateMetadataFactory(args.PodLister)
|
|
})
|
|
factory.RegisterPriorityMetadataProducerFactory(
|
|
func(args factory.PluginFactoryArgs) algorithm.PriorityMetadataProducer {
|
|
return priorities.NewPriorityMetadataFactory(args.ServiceLister, args.ControllerLister, args.ReplicaSetLister, args.StatefulSetLister)
|
|
})
|
|
|
|
registerAlgorithmProvider(defaultPredicates(), defaultPriorities())
|
|
|
|
// IMPORTANT NOTES for predicate developers:
|
|
// We are using cached predicate result for pods belonging to the same equivalence class.
|
|
// So when implementing a new predicate, you are expected to check whether the result
|
|
// of your predicate function can be affected by related API object change (ADD/DELETE/UPDATE).
|
|
// 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
|
|
|
|
// Registers predicates and priorities that are not enabled by default, but user can pick when creating their
|
|
// own set of priorities/predicates.
|
|
|
|
// PodFitsPorts has been replaced by PodFitsHostPorts for better user understanding.
|
|
// For backwards compatibility with 1.0, PodFitsPorts is registered as well.
|
|
factory.RegisterFitPredicate("PodFitsPorts", predicates.PodFitsHostPorts)
|
|
// Fit is defined based on the absence of port conflicts.
|
|
// This predicate is actually a default predicate, because it is invoked from
|
|
// predicates.GeneralPredicates()
|
|
factory.RegisterFitPredicate(predicates.PodFitsHostPortsPred, predicates.PodFitsHostPorts)
|
|
// Fit is determined by resource availability.
|
|
// This predicate is actually a default predicate, because it is invoked from
|
|
// predicates.GeneralPredicates()
|
|
factory.RegisterFitPredicate(predicates.PodFitsResourcesPred, predicates.PodFitsResources)
|
|
// Fit is determined by the presence of the Host parameter and a string match
|
|
// This predicate is actually a default predicate, because it is invoked from
|
|
// predicates.GeneralPredicates()
|
|
factory.RegisterFitPredicate(predicates.HostNamePred, predicates.PodFitsHost)
|
|
// Fit is determined by node selector query.
|
|
factory.RegisterFitPredicate(predicates.MatchNodeSelectorPred, predicates.PodMatchNodeSelector)
|
|
|
|
// ServiceSpreadingPriority is a priority config factory that spreads pods by minimizing
|
|
// the number of pods (belonging to the same service) on the same node.
|
|
// Register the factory so that it's available, but do not include it as part of the default priorities
|
|
// Largely replaced by "SelectorSpreadPriority", but registered for backward compatibility with 1.0
|
|
factory.RegisterPriorityConfigFactory(
|
|
"ServiceSpreadingPriority",
|
|
factory.PriorityConfigFactory{
|
|
MapReduceFunction: func(args factory.PluginFactoryArgs) (algorithm.PriorityMapFunction, algorithm.PriorityReduceFunction) {
|
|
return priorities.NewSelectorSpreadPriority(args.ServiceLister, algorithm.EmptyControllerLister{}, algorithm.EmptyReplicaSetLister{}, algorithm.EmptyStatefulSetLister{})
|
|
},
|
|
Weight: 1,
|
|
},
|
|
)
|
|
// EqualPriority is a prioritizer function that gives an equal weight of one to all nodes
|
|
// Register the priority function so that its available
|
|
// but do not include it as part of the default priorities
|
|
factory.RegisterPriorityFunction2("EqualPriority", core.EqualPriorityMap, nil, 1)
|
|
// ImageLocalityPriority prioritizes nodes based on locality of images requested by a pod. Nodes with larger size
|
|
// of already-installed packages required by the pod will be preferred over nodes with no already-installed
|
|
// packages required by the pod or a small total size of already-installed packages required by the pod.
|
|
factory.RegisterPriorityFunction2("ImageLocalityPriority", priorities.ImageLocalityPriorityMap, nil, 1)
|
|
// Optional, cluster-autoscaler friendly priority function - give used nodes higher priority.
|
|
factory.RegisterPriorityFunction2("MostRequestedPriority", priorities.MostRequestedPriorityMap, nil, 1)
|
|
factory.RegisterPriorityFunction2(
|
|
"RequestedToCapacityRatioPriority",
|
|
priorities.RequestedToCapacityRatioResourceAllocationPriorityDefault().PriorityMap,
|
|
nil,
|
|
1)
|
|
}
|
|
|
|
func defaultPredicates() sets.String {
|
|
return sets.NewString(
|
|
// Fit is determined by volume zone requirements.
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.NoVolumeZoneConflictPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewVolumeZonePredicate(args.PVInfo, args.PVCInfo, args.StorageClassInfo)
|
|
},
|
|
),
|
|
// Fit is determined by whether or not there would be too many AWS EBS volumes attached to the node
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.MaxEBSVolumeCountPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewMaxPDVolumeCountPredicate(predicates.EBSVolumeFilterType, args.PVInfo, args.PVCInfo)
|
|
},
|
|
),
|
|
// Fit is determined by whether or not there would be too many GCE PD volumes attached to the node
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.MaxGCEPDVolumeCountPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewMaxPDVolumeCountPredicate(predicates.GCEPDVolumeFilterType, args.PVInfo, args.PVCInfo)
|
|
},
|
|
),
|
|
// Fit is determined by whether or not there would be too many Azure Disk volumes attached to the node
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.MaxAzureDiskVolumeCountPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewMaxPDVolumeCountPredicate(predicates.AzureDiskVolumeFilterType, args.PVInfo, args.PVCInfo)
|
|
},
|
|
),
|
|
// Fit is determined by inter-pod affinity.
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.MatchInterPodAffinityPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewPodAffinityPredicate(args.NodeInfo, args.PodLister)
|
|
},
|
|
),
|
|
|
|
// Fit is determined by non-conflicting disk volumes.
|
|
factory.RegisterFitPredicate(predicates.NoDiskConflictPred, predicates.NoDiskConflict),
|
|
|
|
// GeneralPredicates are the predicates that are enforced by all Kubernetes components
|
|
// (e.g. kubelet and all schedulers)
|
|
factory.RegisterFitPredicate(predicates.GeneralPred, predicates.GeneralPredicates),
|
|
|
|
// Fit is determined by node memory pressure condition.
|
|
factory.RegisterFitPredicate(predicates.CheckNodeMemoryPressurePred, predicates.CheckNodeMemoryPressurePredicate),
|
|
|
|
// Fit is determined by node disk pressure condition.
|
|
factory.RegisterFitPredicate(predicates.CheckNodeDiskPressurePred, predicates.CheckNodeDiskPressurePredicate),
|
|
|
|
// Fit is determined by node pid pressure condition.
|
|
factory.RegisterFitPredicate(predicates.CheckNodePIDPressurePred, predicates.CheckNodePIDPressurePredicate),
|
|
|
|
// Fit is determined by node conditions: not ready, network unavailable or out of disk.
|
|
factory.RegisterMandatoryFitPredicate(predicates.CheckNodeConditionPred, predicates.CheckNodeConditionPredicate),
|
|
|
|
// Fit is determined based on whether a pod can tolerate all of the node's taints
|
|
factory.RegisterFitPredicate(predicates.PodToleratesNodeTaintsPred, predicates.PodToleratesNodeTaints),
|
|
|
|
// Fit is determined by volume topology requirements.
|
|
factory.RegisterFitPredicateFactory(
|
|
predicates.CheckVolumeBindingPred,
|
|
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
|
|
return predicates.NewVolumeBindingPredicate(args.VolumeBinder)
|
|
},
|
|
),
|
|
)
|
|
}
|
|
|
|
// ApplyFeatureGates applies algorithm by feature gates.
|
|
func ApplyFeatureGates() {
|
|
if utilfeature.DefaultFeatureGate.Enabled(features.TaintNodesByCondition) {
|
|
// Remove "CheckNodeCondition", "CheckNodeMemoryPressure", "CheckNodePIDPressurePred"
|
|
// and "CheckNodeDiskPressure" predicates
|
|
factory.RemoveFitPredicate(predicates.CheckNodeConditionPred)
|
|
factory.RemoveFitPredicate(predicates.CheckNodeMemoryPressurePred)
|
|
factory.RemoveFitPredicate(predicates.CheckNodeDiskPressurePred)
|
|
factory.RemoveFitPredicate(predicates.CheckNodePIDPressurePred)
|
|
// Remove key "CheckNodeCondition", "CheckNodeMemoryPressure" and "CheckNodeDiskPressure"
|
|
// from ALL algorithm provider
|
|
// The key will be removed from all providers which in algorithmProviderMap[]
|
|
// if you just want remove specific provider, call func RemovePredicateKeyFromAlgoProvider()
|
|
factory.RemovePredicateKeyFromAlgorithmProviderMap(predicates.CheckNodeConditionPred)
|
|
factory.RemovePredicateKeyFromAlgorithmProviderMap(predicates.CheckNodeMemoryPressurePred)
|
|
factory.RemovePredicateKeyFromAlgorithmProviderMap(predicates.CheckNodeDiskPressurePred)
|
|
factory.RemovePredicateKeyFromAlgorithmProviderMap(predicates.CheckNodePIDPressurePred)
|
|
|
|
// Fit is determined based on whether a pod can tolerate all of the node's taints
|
|
factory.RegisterMandatoryFitPredicate(predicates.PodToleratesNodeTaintsPred, predicates.PodToleratesNodeTaints)
|
|
// Insert Key "PodToleratesNodeTaints" and "CheckNodeUnschedulable" To All Algorithm Provider
|
|
// The key will insert to all providers which in algorithmProviderMap[]
|
|
// if you just want insert to specific provider, call func InsertPredicateKeyToAlgoProvider()
|
|
factory.InsertPredicateKeyToAlgorithmProviderMap(predicates.PodToleratesNodeTaintsPred)
|
|
|
|
glog.Warningf("TaintNodesByCondition is enabled, PodToleratesNodeTaints predicate is mandatory")
|
|
}
|
|
|
|
// Prioritizes nodes that satisfy pod's resource limits
|
|
if utilfeature.DefaultFeatureGate.Enabled(features.ResourceLimitsPriorityFunction) {
|
|
factory.RegisterPriorityFunction2("ResourceLimitsPriority", priorities.ResourceLimitsPriorityMap, nil, 1)
|
|
}
|
|
|
|
}
|
|
|
|
func registerAlgorithmProvider(predSet, priSet sets.String) {
|
|
// Registers algorithm providers. By default we use 'DefaultProvider', but user can specify one to be used
|
|
// by specifying flag.
|
|
factory.RegisterAlgorithmProvider(factory.DefaultProvider, predSet, priSet)
|
|
// Cluster autoscaler friendly scheduling algorithm.
|
|
factory.RegisterAlgorithmProvider(ClusterAutoscalerProvider, predSet,
|
|
copyAndReplace(priSet, "LeastRequestedPriority", "MostRequestedPriority"))
|
|
}
|
|
|
|
func defaultPriorities() sets.String {
|
|
return sets.NewString(
|
|
// spreads pods by minimizing the number of pods (belonging to the same service or replication controller) on the same node.
|
|
factory.RegisterPriorityConfigFactory(
|
|
"SelectorSpreadPriority",
|
|
factory.PriorityConfigFactory{
|
|
MapReduceFunction: func(args factory.PluginFactoryArgs) (algorithm.PriorityMapFunction, algorithm.PriorityReduceFunction) {
|
|
return priorities.NewSelectorSpreadPriority(args.ServiceLister, args.ControllerLister, args.ReplicaSetLister, args.StatefulSetLister)
|
|
},
|
|
Weight: 1,
|
|
},
|
|
),
|
|
// pods should be placed in the same topological domain (e.g. same node, same rack, same zone, same power domain, etc.)
|
|
// as some other pods, or, conversely, should not be placed in the same topological domain as some other pods.
|
|
factory.RegisterPriorityConfigFactory(
|
|
"InterPodAffinityPriority",
|
|
factory.PriorityConfigFactory{
|
|
Function: func(args factory.PluginFactoryArgs) algorithm.PriorityFunction {
|
|
return priorities.NewInterPodAffinityPriority(args.NodeInfo, args.NodeLister, args.PodLister, args.HardPodAffinitySymmetricWeight)
|
|
},
|
|
Weight: 1,
|
|
},
|
|
),
|
|
|
|
// Prioritize nodes by least requested utilization.
|
|
factory.RegisterPriorityFunction2("LeastRequestedPriority", priorities.LeastRequestedPriorityMap, nil, 1),
|
|
|
|
// Prioritizes nodes to help achieve balanced resource usage
|
|
factory.RegisterPriorityFunction2("BalancedResourceAllocation", priorities.BalancedResourceAllocationMap, nil, 1),
|
|
|
|
// Set this weight large enough to override all other priority functions.
|
|
// TODO: Figure out a better way to do this, maybe at same time as fixing #24720.
|
|
factory.RegisterPriorityFunction2("NodePreferAvoidPodsPriority", priorities.CalculateNodePreferAvoidPodsPriorityMap, nil, 10000),
|
|
|
|
// Prioritizes nodes that have labels matching NodeAffinity
|
|
factory.RegisterPriorityFunction2("NodeAffinityPriority", priorities.CalculateNodeAffinityPriorityMap, priorities.CalculateNodeAffinityPriorityReduce, 1),
|
|
|
|
// Prioritizes nodes that marked with taint which pod can tolerate.
|
|
factory.RegisterPriorityFunction2("TaintTolerationPriority", priorities.ComputeTaintTolerationPriorityMap, priorities.ComputeTaintTolerationPriorityReduce, 1),
|
|
)
|
|
}
|
|
|
|
func copyAndReplace(set sets.String, replaceWhat, replaceWith string) sets.String {
|
|
result := sets.NewString(set.List()...)
|
|
if result.Has(replaceWhat) {
|
|
result.Delete(replaceWhat)
|
|
result.Insert(replaceWith)
|
|
}
|
|
return result
|
|
}
|