mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-28 06:29:29 +01:00
99 lines
3.6 KiB
Go
99 lines
3.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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package strategies
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import (
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"strings"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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"github.com/kubernetes-incubator/descheduler/cmd/descheduler/app/options"
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"github.com/kubernetes-incubator/descheduler/pkg/api"
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"github.com/kubernetes-incubator/descheduler/pkg/descheduler/evictions"
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podutil "github.com/kubernetes-incubator/descheduler/pkg/descheduler/pod"
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)
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//type creator string
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type DuplicatePodsMap map[string][]*v1.Pod
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// RemoveDuplicatePods removes the duplicate pods on node. This strategy evicts all duplicate pods on node.
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// A pod is said to be a duplicate of other if both of them are from same creator, kind and are within the same
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// namespace. As of now, this strategy won't evict daemonsets, mirror pods, critical pods and pods with local storages.
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func RemoveDuplicatePods(ds *options.DeschedulerServer, strategy api.DeschedulerStrategy, policyGroupVersion string, nodes []*v1.Node, nodepodCount nodePodEvictedCount) {
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if !strategy.Enabled {
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return
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}
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deleteDuplicatePods(ds.Client, policyGroupVersion, nodes, ds.DryRun, nodepodCount, ds.MaxNoOfPodsToEvictPerNode)
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}
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// deleteDuplicatePods evicts the pod from node and returns the count of evicted pods.
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func deleteDuplicatePods(client clientset.Interface, policyGroupVersion string, nodes []*v1.Node, dryRun bool, nodepodCount nodePodEvictedCount, maxPodsToEvict int) int {
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podsEvicted := 0
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for _, node := range nodes {
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glog.V(1).Infof("Processing node: %#v", node.Name)
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dpm := ListDuplicatePodsOnANode(client, node)
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for creator, pods := range dpm {
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if len(pods) > 1 {
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glog.V(1).Infof("%#v", creator)
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// i = 0 does not evict the first pod
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for i := 1; i < len(pods); i++ {
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if nodepodCount[node]+1 > maxPodsToEvict {
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break
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}
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success, err := evictions.EvictPod(client, pods[i], policyGroupVersion, dryRun)
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if !success {
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glog.Infof("Error when evicting pod: %#v (%#v)", pods[i].Name, err)
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} else {
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nodepodCount[node]++
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glog.V(1).Infof("Evicted pod: %#v (%#v)", pods[i].Name, err)
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}
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}
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}
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}
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podsEvicted += nodepodCount[node]
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}
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return podsEvicted
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}
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// ListDuplicatePodsOnANode lists duplicate pods on a given node.
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func ListDuplicatePodsOnANode(client clientset.Interface, node *v1.Node) DuplicatePodsMap {
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pods, err := podutil.ListEvictablePodsOnNode(client, node)
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if err != nil {
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return nil
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}
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return FindDuplicatePods(pods)
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}
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// FindDuplicatePods takes a list of pods and returns a duplicatePodsMap.
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func FindDuplicatePods(pods []*v1.Pod) DuplicatePodsMap {
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dpm := DuplicatePodsMap{}
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for _, pod := range pods {
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// Ignoring the error here as in the ListDuplicatePodsOnNode function we call ListEvictablePodsOnNode
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// which checks for error.
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ownerRefList := podutil.OwnerRef(pod)
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for _, ownerRef := range ownerRefList {
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// ownerRef doesn't need namespace since the assumption is owner needs to be in the same namespace.
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s := strings.Join([]string{ownerRef.Kind, ownerRef.Name}, "/")
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dpm[s] = append(dpm[s], pod)
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}
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}
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return dpm
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}
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