mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 13:29:11 +01:00
70 lines
2.2 KiB
Go
70 lines
2.2 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 utils
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import (
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corev1 "k8s.io/api/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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)
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const (
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EvictionKind = "Eviction"
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EvictionSubresource = "pods/eviction"
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// A new experimental feature for soft no-eviction preference.
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// Each plugin will decide whether the soft preference will be respected.
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// If configured the soft preference turns into a mandatory no-eviction policy for the DefaultEvictor plugin.
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SoftNoEvictionAnnotationKey = "descheduler.alpha.kubernetes.io/prefer-no-eviction"
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)
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// SupportEviction uses Discovery API to find out if the server support eviction subresource
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// If support, it will return its groupVersion; Otherwise, it will return ""
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func SupportEviction(client clientset.Interface) (string, error) {
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discoveryClient := client.Discovery()
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groupList, err := discoveryClient.ServerGroups()
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if err != nil {
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return "", err
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}
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foundPolicyGroup := false
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var policyGroupVersion string
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for _, group := range groupList.Groups {
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if group.Name == "policy" {
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foundPolicyGroup = true
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policyGroupVersion = group.PreferredVersion.GroupVersion
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break
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}
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}
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if !foundPolicyGroup {
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return "", nil
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}
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resourceList, err := discoveryClient.ServerResourcesForGroupVersion("v1")
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if err != nil {
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return "", err
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}
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for _, resource := range resourceList.APIResources {
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if resource.Name == EvictionSubresource && resource.Kind == EvictionKind {
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return policyGroupVersion, nil
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}
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}
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return "", nil
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}
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// HaveNoEvictionAnnotation checks if the pod have soft no-eviction annotation
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func HaveNoEvictionAnnotation(pod *corev1.Pod) bool {
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_, found := pod.ObjectMeta.Annotations[SoftNoEvictionAnnotationKey]
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return found
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}
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