Squashed 'k8smain/' content from commit 719158d
git-subtree-dir: k8smain git-subtree-split: 719158d2c8788c30cc9e1c51bbebb53c5801524e
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johndmulhausen
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/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// This is the default algorithm provider for the scheduler.
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package defaults
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import (
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"os"
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"strconv"
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"k8s.io/kubernetes/pkg/util/sets"
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"k8s.io/kubernetes/plugin/pkg/scheduler"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/priorities"
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"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
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"github.com/golang/glog"
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)
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// Amazon recommends having no more that 40 volumes attached to an instance,
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// and at least one of those is for the system root volume.
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const DefaultMaxEBSVolumes = 39
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// GCE instances can have up to 16 PD volumes attached.
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const DefaultMaxGCEPDVolumes = 16
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// getMaxVols checks the max PD volumes environment variable, otherwise returning a default value
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func getMaxVols(defaultVal int) int {
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if rawMaxVols := os.Getenv("KUBE_MAX_PD_VOLS"); rawMaxVols != "" {
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if parsedMaxVols, err := strconv.Atoi(rawMaxVols); err != nil {
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glog.Errorf("Unable to parse maxiumum PD volumes value, using default of %v: %v", defaultVal, err)
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} else if parsedMaxVols <= 0 {
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glog.Errorf("Maximum PD volumes must be a positive value, using default of %v", defaultVal)
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} else {
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return parsedMaxVols
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}
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}
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return defaultVal
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}
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func init() {
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factory.RegisterAlgorithmProvider(factory.DefaultProvider, defaultPredicates(), defaultPriorities())
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// EqualPriority is a prioritizer function that gives an equal weight of one to all nodes
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// Register the priority function so that its available
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// but do not include it as part of the default priorities
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factory.RegisterPriorityFunction("EqualPriority", scheduler.EqualPriority, 1)
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// ServiceSpreadingPriority is a priority config factory that spreads pods by minimizing
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// the number of pods (belonging to the same service) on the same node.
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// Register the factory so that it's available, but do not include it as part of the default priorities
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// Largely replaced by "SelectorSpreadPriority", but registered for backward compatibility with 1.0
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factory.RegisterPriorityConfigFactory(
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"ServiceSpreadingPriority",
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factory.PriorityConfigFactory{
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Function: func(args factory.PluginFactoryArgs) algorithm.PriorityFunction {
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return priorities.NewSelectorSpreadPriority(args.PodLister, args.ServiceLister, algorithm.EmptyControllerLister{}, algorithm.EmptyReplicaSetLister{})
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},
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Weight: 1,
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},
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)
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// PodFitsPorts has been replaced by PodFitsHostPorts for better user understanding.
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// For backwards compatibility with 1.0, PodFitsPorts is regitered as well.
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factory.RegisterFitPredicate("PodFitsPorts", predicates.PodFitsHostPorts)
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// ImageLocalityPriority prioritizes nodes based on locality of images requested by a pod. Nodes with larger size
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// of already-installed packages required by the pod will be preferred over nodes with no already-installed
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// packages required by the pod or a small total size of already-installed packages required by the pod.
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factory.RegisterPriorityFunction("ImageLocalityPriority", priorities.ImageLocalityPriority, 1)
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}
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func defaultPredicates() sets.String {
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return sets.NewString(
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// Fit is defined based on the absence of port conflicts.
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factory.RegisterFitPredicate("PodFitsHostPorts", predicates.PodFitsHostPorts),
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// Fit is determined by resource availability.
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factory.RegisterFitPredicateFactory(
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"PodFitsResources",
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func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
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return predicates.NewResourceFitPredicate(args.NodeInfo)
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},
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),
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// Fit is determined by non-conflicting disk volumes.
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factory.RegisterFitPredicate("NoDiskConflict", predicates.NoDiskConflict),
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// Fit is determined by volume zone requirements.
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factory.RegisterFitPredicateFactory(
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"NoVolumeZoneConflict",
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func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
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return predicates.NewVolumeZonePredicate(args.NodeInfo, args.PVInfo, args.PVCInfo)
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},
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),
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// Fit is determined by node selector query.
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factory.RegisterFitPredicateFactory(
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"MatchNodeSelector",
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func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
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return predicates.NewSelectorMatchPredicate(args.NodeInfo)
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},
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),
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// Fit is determined by the presence of the Host parameter and a string match
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factory.RegisterFitPredicate("HostName", predicates.PodFitsHost),
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// Fit is determined by whether or not there would be too many AWS EBS volumes attached to the node
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factory.RegisterFitPredicateFactory(
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"MaxEBSVolumeCount",
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func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
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// TODO: allow for generically parameterized scheduler predicates, because this is a bit ugly
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maxVols := getMaxVols(DefaultMaxEBSVolumes)
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return predicates.NewMaxPDVolumeCountPredicate(predicates.EBSVolumeFilter, maxVols, args.PVInfo, args.PVCInfo)
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},
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),
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// Fit is determined by whether or not there would be too many GCE PD volumes attached to the node
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factory.RegisterFitPredicateFactory(
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"MaxGCEPDVolumeCount",
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func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
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// TODO: allow for generically parameterized scheduler predicates, because this is a bit ugly
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maxVols := getMaxVols(DefaultMaxGCEPDVolumes)
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return predicates.NewMaxPDVolumeCountPredicate(predicates.GCEPDVolumeFilter, maxVols, args.PVInfo, args.PVCInfo)
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},
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),
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)
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}
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func defaultPriorities() sets.String {
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return sets.NewString(
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// Prioritize nodes by least requested utilization.
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factory.RegisterPriorityFunction("LeastRequestedPriority", priorities.LeastRequestedPriority, 1),
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// Prioritizes nodes to help achieve balanced resource usage
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factory.RegisterPriorityFunction("BalancedResourceAllocation", priorities.BalancedResourceAllocation, 1),
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// spreads pods by minimizing the number of pods (belonging to the same service or replication controller) on the same node.
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factory.RegisterPriorityConfigFactory(
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"SelectorSpreadPriority",
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factory.PriorityConfigFactory{
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Function: func(args factory.PluginFactoryArgs) algorithm.PriorityFunction {
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return priorities.NewSelectorSpreadPriority(args.PodLister, args.ServiceLister, args.ControllerLister, args.ReplicaSetLister)
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},
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Weight: 1,
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},
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),
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factory.RegisterPriorityConfigFactory(
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"NodeAffinityPriority",
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factory.PriorityConfigFactory{
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Function: func(args factory.PluginFactoryArgs) algorithm.PriorityFunction {
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return priorities.NewNodeAffinityPriority(args.NodeLister)
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},
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Weight: 1,
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},
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),
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)
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}
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