mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 05:14:13 +01:00
335 lines
10 KiB
Go
335 lines
10 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 e2e
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import (
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"context"
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"math"
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"os"
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"strings"
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"testing"
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"time"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/informers"
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coreinformers "k8s.io/client-go/informers/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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"sigs.k8s.io/descheduler/cmd/descheduler/app/options"
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"sigs.k8s.io/descheduler/pkg/api"
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deschedulerapi "sigs.k8s.io/descheduler/pkg/api"
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"sigs.k8s.io/descheduler/pkg/descheduler"
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"sigs.k8s.io/descheduler/pkg/descheduler/client"
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"sigs.k8s.io/descheduler/pkg/descheduler/evictions"
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eutils "sigs.k8s.io/descheduler/pkg/descheduler/evictions/utils"
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nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
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podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
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"sigs.k8s.io/descheduler/pkg/descheduler/strategies"
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)
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func MakePodSpec() v1.PodSpec {
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return v1.PodSpec{
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Containers: []v1.Container{{
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Name: "pause",
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ImagePullPolicy: "Never",
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Image: "kubernetes/pause",
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Ports: []v1.ContainerPort{{ContainerPort: 80}},
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Resources: v1.ResourceRequirements{
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Limits: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("100m"),
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v1.ResourceMemory: resource.MustParse("1000Mi"),
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},
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Requests: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("100m"),
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v1.ResourceMemory: resource.MustParse("800Mi"),
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},
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},
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}},
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}
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}
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// RcByNameContainer returns a ReplicationControoler with specified name and container
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func RcByNameContainer(name string, replicas int32, labels map[string]string, gracePeriod *int64) *v1.ReplicationController {
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zeroGracePeriod := int64(0)
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// Add "name": name to the labels, overwriting if it exists.
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labels["name"] = name
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if gracePeriod == nil {
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gracePeriod = &zeroGracePeriod
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}
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return &v1.ReplicationController{
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TypeMeta: metav1.TypeMeta{
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Kind: "ReplicationController",
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APIVersion: "v1",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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},
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Spec: v1.ReplicationControllerSpec{
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Replicas: func(i int32) *int32 { return &i }(replicas),
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Selector: map[string]string{
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"name": name,
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},
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Template: &v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: labels,
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},
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Spec: MakePodSpec(),
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},
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},
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}
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}
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// startEndToEndForLowNodeUtilization tests the lownode utilization strategy.
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func startEndToEndForLowNodeUtilization(ctx context.Context, clientset clientset.Interface, nodeInformer coreinformers.NodeInformer, podEvictor *evictions.PodEvictor) {
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// Run descheduler.
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nodes, err := nodeutil.ReadyNodes(ctx, clientset, nodeInformer, "", nil)
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if err != nil {
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klog.Fatalf("%v", err)
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}
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strategies.LowNodeUtilization(
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ctx,
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clientset,
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deschedulerapi.DeschedulerStrategy{
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Enabled: true,
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Params: &deschedulerapi.StrategyParameters{
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NodeResourceUtilizationThresholds: &deschedulerapi.NodeResourceUtilizationThresholds{
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Thresholds: deschedulerapi.ResourceThresholds{
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v1.ResourceMemory: 20,
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v1.ResourcePods: 20,
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v1.ResourceCPU: 85,
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},
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TargetThresholds: deschedulerapi.ResourceThresholds{
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v1.ResourceMemory: 20,
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v1.ResourcePods: 20,
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v1.ResourceCPU: 90,
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},
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},
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},
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},
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nodes,
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podEvictor,
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)
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time.Sleep(10 * time.Second)
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}
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func TestLowNodeUtilization(t *testing.T) {
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ctx := context.Background()
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clientSet, err := client.CreateClient(os.Getenv("KUBECONFIG"))
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if err != nil {
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t.Errorf("Error during client creation with %v", err)
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}
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stopChannel := make(chan struct{}, 0)
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sharedInformerFactory := informers.NewSharedInformerFactory(clientSet, 0)
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sharedInformerFactory.Start(stopChannel)
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sharedInformerFactory.WaitForCacheSync(stopChannel)
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defer close(stopChannel)
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nodeInformer := sharedInformerFactory.Core().V1().Nodes()
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nodeList, err := clientSet.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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t.Errorf("Error listing node with %v", err)
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}
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var nodes []*v1.Node
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for i := range nodeList.Items {
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node := nodeList.Items[i]
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nodes = append(nodes, &node)
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}
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rc := RcByNameContainer("test-rc-node-utilization", int32(15), map[string]string{"test": "node-utilization"}, nil)
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if _, err := clientSet.CoreV1().ReplicationControllers(rc.Namespace).Create(ctx, rc, metav1.CreateOptions{}); err != nil {
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t.Errorf("Error creating deployment %v", err)
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}
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evictPods(ctx, t, clientSet, nodeInformer, nodes, rc)
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deleteRC(ctx, t, clientSet, rc)
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}
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func TestEvictAnnotation(t *testing.T) {
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ctx := context.Background()
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clientSet, err := client.CreateClient(os.Getenv("KUBECONFIG"))
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if err != nil {
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t.Errorf("Error during client creation with %v", err)
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}
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stopChannel := make(chan struct{}, 0)
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sharedInformerFactory := informers.NewSharedInformerFactory(clientSet, 0)
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sharedInformerFactory.Start(stopChannel)
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sharedInformerFactory.WaitForCacheSync(stopChannel)
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defer close(stopChannel)
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nodeInformer := sharedInformerFactory.Core().V1().Nodes()
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nodeList, err := clientSet.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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t.Errorf("Error listing node with %v", err)
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}
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var nodes []*v1.Node
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for i := range nodeList.Items {
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node := nodeList.Items[i]
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nodes = append(nodes, &node)
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}
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rc := RcByNameContainer("test-rc-evict-annotation", int32(15), map[string]string{"test": "annotation"}, nil)
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rc.Spec.Template.Annotations = map[string]string{"descheduler.alpha.kubernetes.io/evict": "true"}
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rc.Spec.Template.Spec.Volumes = []v1.Volume{
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{
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Name: "sample",
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VolumeSource: v1.VolumeSource{
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EmptyDir: &v1.EmptyDirVolumeSource{
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SizeLimit: resource.NewQuantity(int64(10), resource.BinarySI)},
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},
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},
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}
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if _, err := clientSet.CoreV1().ReplicationControllers(rc.Namespace).Create(ctx, rc, metav1.CreateOptions{}); err != nil {
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t.Errorf("Error creating deployment %v", err)
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}
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evictPods(ctx, t, clientSet, nodeInformer, nodes, rc)
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deleteRC(ctx, t, clientSet, rc)
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}
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func TestDeschedulingInterval(t *testing.T) {
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ctx := context.Background()
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clientSet, err := client.CreateClient(os.Getenv("KUBECONFIG"))
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if err != nil {
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t.Errorf("Error during client creation with %v", err)
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}
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// By default, the DeschedulingInterval param should be set to 0, meaning Descheduler only runs once then exits
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s := options.NewDeschedulerServer()
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s.Client = clientSet
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deschedulerPolicy := &api.DeschedulerPolicy{}
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c := make(chan bool)
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go func() {
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evictionPolicyGroupVersion, err := eutils.SupportEviction(s.Client)
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if err != nil || len(evictionPolicyGroupVersion) == 0 {
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t.Errorf("Error when checking support for eviction: %v", err)
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}
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stopChannel := make(chan struct{})
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if err := descheduler.RunDeschedulerStrategies(ctx, s, deschedulerPolicy, evictionPolicyGroupVersion, stopChannel); err != nil {
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t.Errorf("Error running descheduler strategies: %+v", err)
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}
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c <- true
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}()
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select {
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case <-c:
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// successfully returned
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case <-time.After(3 * time.Minute):
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t.Errorf("descheduler.Run timed out even without descheduling-interval set")
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}
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}
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func deleteRC(ctx context.Context, t *testing.T, clientSet clientset.Interface, rc *v1.ReplicationController) {
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//set number of replicas to 0
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rcdeepcopy := rc.DeepCopy()
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rcdeepcopy.Spec.Replicas = func(i int32) *int32 { return &i }(0)
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if _, err := clientSet.CoreV1().ReplicationControllers(rcdeepcopy.Namespace).Update(ctx, rcdeepcopy, metav1.UpdateOptions{}); err != nil {
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t.Fatalf("Error updating replica controller %v", err)
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}
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allPodsDeleted := false
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//wait 30 seconds until all pods are deleted
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for i := 0; i < 6; i++ {
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scale, _ := clientSet.CoreV1().ReplicationControllers(rc.Namespace).GetScale(ctx, rc.Name, metav1.GetOptions{})
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if scale.Spec.Replicas == 0 {
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allPodsDeleted = true
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break
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}
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time.Sleep(5 * time.Second)
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}
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if !allPodsDeleted {
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t.Errorf("Deleting of rc pods took too long")
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}
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if err := clientSet.CoreV1().ReplicationControllers(rc.Namespace).Delete(ctx, rc.Name, metav1.DeleteOptions{}); err != nil {
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t.Fatalf("Error deleting rc %v", err)
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}
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if err := wait.PollImmediate(time.Second, 10*time.Second, func() (bool, error) {
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_, err := clientSet.CoreV1().ReplicationControllers(rc.Namespace).Get(ctx, rc.Name, metav1.GetOptions{})
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if err != nil && strings.Contains(err.Error(), "not found") {
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return true, nil
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}
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return false, nil
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}); err != nil {
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t.Fatalf("Error deleting rc %v", err)
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}
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}
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func evictPods(ctx context.Context, t *testing.T, clientSet clientset.Interface, nodeInformer coreinformers.NodeInformer, nodeList []*v1.Node, rc *v1.ReplicationController) {
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var leastLoadedNode *v1.Node
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podsBefore := math.MaxInt16
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evictionPolicyGroupVersion, err := eutils.SupportEviction(clientSet)
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if err != nil || len(evictionPolicyGroupVersion) == 0 {
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klog.Fatalf("%v", err)
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}
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podEvictor := evictions.NewPodEvictor(
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clientSet,
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evictionPolicyGroupVersion,
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false,
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0,
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nodeList,
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true,
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)
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for _, node := range nodeList {
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// Skip the Master Node
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if _, exist := node.Labels["node-role.kubernetes.io/master"]; exist {
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continue
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}
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// List all the pods on the current Node
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podsOnANode, err := podutil.ListPodsOnANode(ctx, clientSet, node, podEvictor.IsEvictable)
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if err != nil {
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t.Errorf("Error listing pods on a node %v", err)
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}
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// Update leastLoadedNode if necessary
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if tmpLoads := len(podsOnANode); tmpLoads < podsBefore {
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leastLoadedNode = node
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podsBefore = tmpLoads
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}
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}
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t.Log("Eviction of pods starting")
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startEndToEndForLowNodeUtilization(ctx, clientSet, nodeInformer, podEvictor)
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podsOnleastUtilizedNode, err := podutil.ListPodsOnANode(ctx, clientSet, leastLoadedNode, podEvictor.IsEvictable)
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if err != nil {
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t.Errorf("Error listing pods on a node %v", err)
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}
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podsAfter := len(podsOnleastUtilizedNode)
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if podsBefore > podsAfter {
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t.Fatalf("We should have see more pods on this node as per kubeadm's way of installing %v, %v", podsBefore, podsAfter)
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}
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}
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