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https://github.com/kubernetes-sigs/descheduler.git
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7380aa6e0a
NoEvictionPolicy dictates whether a no-eviction policy is prefered or mandatory. Needs to be used with caution as this will give users ability to protect their pods from eviction. Which might work against enfored policies. E.g. plugins evicting pods violating security policies.
310 lines
8.4 KiB
Go
310 lines
8.4 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 pod
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import (
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"context"
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"fmt"
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"reflect"
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"testing"
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"time"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes/fake"
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"sigs.k8s.io/descheduler/test"
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)
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var (
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lowPriority = int32(0)
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highPriority = int32(10000)
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)
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func TestListPodsOnANode(t *testing.T) {
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testCases := []struct {
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name string
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pods []*v1.Pod
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node *v1.Node
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labelSelector *metav1.LabelSelector
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expectedPodCount int
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}{
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{
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name: "test listing pods on a node",
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pods: []*v1.Pod{
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test.BuildTestPod("pod1", 100, 0, "n1", nil),
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test.BuildTestPod("pod2", 100, 0, "n1", nil),
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test.BuildTestPod("pod3", 100, 0, "n2", nil),
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},
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node: test.BuildTestNode("n1", 2000, 3000, 10, nil),
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labelSelector: nil,
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expectedPodCount: 2,
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},
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{
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name: "test listing pods with label selector",
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pods: []*v1.Pod{
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test.BuildTestPod("pod1", 100, 0, "n1", nil),
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test.BuildTestPod("pod2", 100, 0, "n1", func(pod *v1.Pod) {
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pod.Labels = map[string]string{"foo": "bar"}
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}),
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test.BuildTestPod("pod3", 100, 0, "n1", func(pod *v1.Pod) {
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pod.Labels = map[string]string{"foo": "bar1"}
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}),
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test.BuildTestPod("pod4", 100, 0, "n2", nil),
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},
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node: test.BuildTestNode("n1", 2000, 3000, 10, nil),
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labelSelector: &metav1.LabelSelector{
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MatchExpressions: []metav1.LabelSelectorRequirement{
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{
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Key: "foo",
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Operator: metav1.LabelSelectorOpIn,
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Values: []string{"bar", "bar1"},
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},
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},
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},
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expectedPodCount: 2,
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},
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}
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for _, testCase := range testCases {
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t.Run(testCase.name, func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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var objs []runtime.Object
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objs = append(objs, testCase.node)
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for _, pod := range testCase.pods {
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objs = append(objs, pod)
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}
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fakeClient := fake.NewSimpleClientset(objs...)
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sharedInformerFactory := informers.NewSharedInformerFactory(fakeClient, 0)
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podInformer := sharedInformerFactory.Core().V1().Pods().Informer()
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getPodsAssignedToNode, err := BuildGetPodsAssignedToNodeFunc(podInformer)
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if err != nil {
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t.Errorf("Build get pods assigned to node function error: %v", err)
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}
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sharedInformerFactory.Start(ctx.Done())
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sharedInformerFactory.WaitForCacheSync(ctx.Done())
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filter, err := NewOptions().WithLabelSelector(testCase.labelSelector).BuildFilterFunc()
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if err != nil {
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t.Errorf("Build filter function error: %v", err)
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}
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pods, _ := ListPodsOnANode(testCase.node.Name, getPodsAssignedToNode, filter)
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if len(pods) != testCase.expectedPodCount {
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t.Errorf("Expected %v pods on node %v, got %+v", testCase.expectedPodCount, testCase.node.Name, len(pods))
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}
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})
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}
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}
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func getPodListNames(pods []*v1.Pod) []string {
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names := []string{}
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for _, pod := range pods {
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names = append(names, pod.Name)
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}
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return names
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}
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func TestSortPodsBasedOnPriorityLowToHigh(t *testing.T) {
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n1 := test.BuildTestNode("n1", 4000, 3000, 9, nil)
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p1 := test.BuildTestPod("p1", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, lowPriority)
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})
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// BestEffort
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p2 := test.BuildTestPod("p2", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeBestEffortPod(pod)
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})
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// Burstable
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p3 := test.BuildTestPod("p3", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeBurstablePod(pod)
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})
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// Guaranteed
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p4 := test.BuildTestPod("p4", 400, 100, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeGuaranteedPod(pod)
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})
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// Best effort with nil priorities.
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p5 := test.BuildTestPod("p5", 400, 100, n1.Name, test.MakeBestEffortPod)
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p5.Spec.Priority = nil
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p6 := test.BuildTestPod("p6", 400, 100, n1.Name, test.MakeGuaranteedPod)
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p6.Spec.Priority = nil
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p7 := test.BuildTestPod("p7", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, lowPriority)
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pod.Annotations = map[string]string{
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"descheduler.alpha.kubernetes.io/prefer-no-eviction": "",
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}
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})
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// BestEffort
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p8 := test.BuildTestPod("p8", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeBestEffortPod(pod)
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pod.Annotations = map[string]string{
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"descheduler.alpha.kubernetes.io/prefer-no-eviction": "",
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}
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})
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// Burstable
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p9 := test.BuildTestPod("p9", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeBurstablePod(pod)
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pod.Annotations = map[string]string{
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"descheduler.alpha.kubernetes.io/prefer-no-eviction": "",
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}
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})
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// Guaranteed
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p10 := test.BuildTestPod("p10", 400, 100, n1.Name, func(pod *v1.Pod) {
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test.SetPodPriority(pod, highPriority)
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test.MakeGuaranteedPod(pod)
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pod.Annotations = map[string]string{
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"descheduler.alpha.kubernetes.io/prefer-no-eviction": "",
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}
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})
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// Burstable
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p11 := test.BuildTestPod("p11", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.MakeBurstablePod(pod)
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})
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// Burstable
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p12 := test.BuildTestPod("p12", 400, 0, n1.Name, func(pod *v1.Pod) {
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test.MakeBurstablePod(pod)
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pod.Annotations = map[string]string{
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"descheduler.alpha.kubernetes.io/prefer-no-eviction": "",
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}
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})
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podList := []*v1.Pod{p1, p8, p9, p10, p2, p3, p4, p5, p6, p7, p11, p12}
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// p5: no priority, best effort
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// p11: no priority, burstable
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// p6: no priority, guaranteed
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// p1: low priority
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// p7: low priority, prefer-no-eviction
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// p2: high priority, best effort
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// p8: high priority, best effort, prefer-no-eviction
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// p3: high priority, burstable
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// p9: high priority, burstable, prefer-no-eviction
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// p4: high priority, guaranteed
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// p10: high priority, guaranteed, prefer-no-eviction
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expectedPodList := []*v1.Pod{p5, p11, p12, p6, p1, p7, p2, p8, p3, p9, p4, p10}
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SortPodsBasedOnPriorityLowToHigh(podList)
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if !reflect.DeepEqual(getPodListNames(podList), getPodListNames(expectedPodList)) {
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t.Errorf("Pods were sorted in an unexpected order: %v, expected %v", getPodListNames(podList), getPodListNames(expectedPodList))
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}
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}
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func TestSortPodsBasedOnAge(t *testing.T) {
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podList := make([]*v1.Pod, 9)
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n1 := test.BuildTestNode("n1", 4000, 3000, int64(len(podList)), nil)
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for i := 0; i < len(podList); i++ {
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podList[i] = test.BuildTestPod(fmt.Sprintf("p%d", i), 1, 32, n1.Name, func(pod *v1.Pod) {
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creationTimestamp := metav1.Now().Add(time.Minute * time.Duration(-i))
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pod.ObjectMeta.SetCreationTimestamp(metav1.NewTime(creationTimestamp))
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})
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}
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SortPodsBasedOnAge(podList)
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for i := 0; i < len(podList)-1; i++ {
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if podList[i+1].CreationTimestamp.Before(&podList[i].CreationTimestamp) {
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t.Errorf("Expected pods to be sorted by age but pod at index %d was older than %d", i+1, i)
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}
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}
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}
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func TestGroupByNodeName(t *testing.T) {
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tests := []struct {
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name string
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pods []*v1.Pod
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expMap map[string][]*v1.Pod
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}{
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{
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name: "list of pods is empty",
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pods: []*v1.Pod{},
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expMap: map[string][]*v1.Pod{},
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},
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{
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name: "pods are on same node",
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pods: []*v1.Pod{
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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},
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expMap: map[string][]*v1.Pod{"node1": {
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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}},
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},
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{
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name: "pods are on different nodes",
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pods: []*v1.Pod{
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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{Spec: v1.PodSpec{
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NodeName: "node2",
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}},
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},
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expMap: map[string][]*v1.Pod{
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"node1": {
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{Spec: v1.PodSpec{
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NodeName: "node1",
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}},
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},
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"node2": {
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{Spec: v1.PodSpec{
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NodeName: "node2",
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}},
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},
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},
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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resultMap := GroupByNodeName(test.pods)
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if !reflect.DeepEqual(resultMap, test.expMap) {
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t.Errorf("Expected %v node map, got %v", test.expMap, resultMap)
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}
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})
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}
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}
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