mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-08-19 12:36:23 +00:00
273 lines
10 KiB
Go
273 lines
10 KiB
Go
/*
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Copyright 2021 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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"os"
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"strings"
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"testing"
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"time"
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appsv1 "k8s.io/api/apps/v1"
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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/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/wait"
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componentbaseconfig "k8s.io/component-base/config"
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utilptr "k8s.io/utils/ptr"
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"sigs.k8s.io/descheduler/pkg/api"
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apiv1alpha2 "sigs.k8s.io/descheduler/pkg/api/v1alpha2"
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"sigs.k8s.io/descheduler/pkg/descheduler/client"
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"sigs.k8s.io/descheduler/pkg/framework/plugins/defaultevictor"
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"sigs.k8s.io/descheduler/pkg/framework/plugins/nodeutilization"
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)
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func lowNodeUtilizationPolicy(lowNodeUtilizationArgs *nodeutilization.LowNodeUtilizationArgs, evictorArgs *defaultevictor.DefaultEvictorArgs, metricsCollectorEnabled bool) *apiv1alpha2.DeschedulerPolicy {
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return &apiv1alpha2.DeschedulerPolicy{
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MetricsCollector: &apiv1alpha2.MetricsCollector{
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Enabled: metricsCollectorEnabled,
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},
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Profiles: []apiv1alpha2.DeschedulerProfile{
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{
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Name: nodeutilization.LowNodeUtilizationPluginName + "Profile",
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PluginConfigs: []apiv1alpha2.PluginConfig{
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{
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Name: nodeutilization.LowNodeUtilizationPluginName,
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Args: runtime.RawExtension{
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Object: lowNodeUtilizationArgs,
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},
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},
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{
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Name: defaultevictor.PluginName,
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Args: runtime.RawExtension{
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Object: evictorArgs,
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},
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},
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},
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Plugins: apiv1alpha2.Plugins{
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Filter: apiv1alpha2.PluginSet{
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Enabled: []string{
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defaultevictor.PluginName,
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},
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},
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Balance: apiv1alpha2.PluginSet{
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Enabled: []string{
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nodeutilization.LowNodeUtilizationPluginName,
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},
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},
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},
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},
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},
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}
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}
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func TestLowNodeUtilizationKubernetesMetrics(t *testing.T) {
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ctx := context.Background()
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clientSet, err := client.CreateClient(componentbaseconfig.ClientConnectionConfiguration{Kubeconfig: os.Getenv("KUBECONFIG")}, "")
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if err != nil {
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t.Errorf("Error during kubernetes client creation with %v", err)
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}
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metricsClient, err := client.CreateMetricsClient(componentbaseconfig.ClientConnectionConfiguration{Kubeconfig: os.Getenv("KUBECONFIG")}, "descheduler")
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if err != nil {
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t.Errorf("Error during kubernetes metrics client creation with %v", err)
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}
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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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_, workerNodes := splitNodesAndWorkerNodes(nodeList.Items)
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testNamespace := &v1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: "e2e-" + strings.ToLower(t.Name())}}
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t.Logf("Creating testing namespace %q", testNamespace.Name)
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if _, err := clientSet.CoreV1().Namespaces().Create(ctx, testNamespace, metav1.CreateOptions{}); err != nil {
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t.Fatalf("Unable to create ns %v: %v", testNamespace.Name, err)
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}
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t.Cleanup(func() {
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clientSet.CoreV1().Namespaces().Delete(ctx, testNamespace.Name, metav1.DeleteOptions{})
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})
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t.Log("Creating duplicates pods")
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testLabel := map[string]string{"app": "test-lownodeutilization-kubernetes-metrics", "name": "test-lownodeutilization-kubernetes-metrics"}
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deploymentObj := buildTestDeployment("lownodeutilization-kubernetes-metrics-pod", testNamespace.Name, 0, testLabel, nil)
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deploymentObj.Spec.Template.Spec.Containers[0].Image = "narmidm/k8s-pod-cpu-stressor:latest"
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deploymentObj.Spec.Template.Spec.Containers[0].Args = []string{"-cpu=1.0", "-duration=10s", "-forever"}
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deploymentObj.Spec.Template.Spec.Containers[0].Resources = v1.ResourceRequirements{
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Limits: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("3000m"),
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},
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Requests: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("0m"),
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},
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}
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tests := []struct {
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name string
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replicasNum int
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beforeFunc func(deployment *appsv1.Deployment)
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expectedEvictedPodCount int
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lowNodeUtilizationArgs *nodeutilization.LowNodeUtilizationArgs
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evictorArgs *defaultevictor.DefaultEvictorArgs
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metricsCollectorEnabled bool
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}{
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{
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name: "metric server not enabled",
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replicasNum: 4,
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beforeFunc: func(deployment *appsv1.Deployment) {
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deployment.Spec.Replicas = utilptr.To[int32](4)
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deployment.Spec.Template.Spec.NodeName = workerNodes[0].Name
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},
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expectedEvictedPodCount: 0,
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lowNodeUtilizationArgs: &nodeutilization.LowNodeUtilizationArgs{
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Thresholds: api.ResourceThresholds{
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v1.ResourceCPU: 30,
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v1.ResourcePods: 30,
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},
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TargetThresholds: api.ResourceThresholds{
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v1.ResourceCPU: 50,
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v1.ResourcePods: 50,
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},
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MetricsUtilization: &nodeutilization.MetricsUtilization{
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Source: api.KubernetesMetrics,
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},
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},
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evictorArgs: &defaultevictor.DefaultEvictorArgs{},
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metricsCollectorEnabled: false,
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},
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{
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name: "requested cpu resource zero, actual cpu utilization 3 per pod",
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replicasNum: 4,
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beforeFunc: func(deployment *appsv1.Deployment) {
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deployment.Spec.Replicas = utilptr.To[int32](4)
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deployment.Spec.Template.Spec.NodeName = workerNodes[0].Name
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},
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expectedEvictedPodCount: 2,
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lowNodeUtilizationArgs: &nodeutilization.LowNodeUtilizationArgs{
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Thresholds: api.ResourceThresholds{
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v1.ResourceCPU: 8,
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v1.ResourcePods: 30,
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},
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TargetThresholds: api.ResourceThresholds{
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v1.ResourceCPU: 15,
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v1.ResourcePods: 50,
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},
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MetricsUtilization: &nodeutilization.MetricsUtilization{
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Source: api.KubernetesMetrics,
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},
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},
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evictorArgs: &defaultevictor.DefaultEvictorArgs{},
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metricsCollectorEnabled: true,
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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t.Logf("Creating deployment %v in %v namespace", deploymentObj.Name, deploymentObj.Namespace)
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tc.beforeFunc(deploymentObj)
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_, err = clientSet.AppsV1().Deployments(deploymentObj.Namespace).Create(ctx, deploymentObj, metav1.CreateOptions{})
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if err != nil {
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t.Logf("Error creating deployment: %v", err)
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if err = clientSet.AppsV1().Deployments(deploymentObj.Namespace).DeleteCollection(ctx, metav1.DeleteOptions{}, metav1.ListOptions{
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LabelSelector: labels.SelectorFromSet(deploymentObj.Labels).String(),
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}); err != nil {
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t.Fatalf("Unable to delete deployment: %v", err)
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}
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return
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}
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t.Cleanup(func() {
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clientSet.AppsV1().Deployments(deploymentObj.Namespace).Delete(ctx, deploymentObj.Name, metav1.DeleteOptions{})
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waitForPodsToDisappear(ctx, t, clientSet, deploymentObj.Labels, deploymentObj.Namespace)
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})
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waitForPodsRunning(ctx, t, clientSet, deploymentObj.Labels, tc.replicasNum, deploymentObj.Namespace)
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// wait until workerNodes[0].Name has the right actual cpu utilization and all the testing pods are running
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// and producing ~4 cores in total
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if err := wait.PollUntilContextTimeout(ctx, 5*time.Second, 60*time.Second, true, func(ctx context.Context) (done bool, err error) {
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item, err := metricsClient.MetricsV1beta1().NodeMetricses().Get(ctx, workerNodes[0].Name, metav1.GetOptions{})
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if err != nil {
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t.Logf("unable to list nodemetricses: %v", err)
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return false, nil
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}
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t.Logf("Waiting for %q nodemetrics cpu utilization to get over 3, currently %v", workerNodes[0].Name, item.Usage.Cpu().Value())
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if item.Usage.Cpu().Value() < 3 {
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return false, nil
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}
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totalCpu := resource.NewMilliQuantity(0, resource.DecimalSI)
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podItems, err := metricsClient.MetricsV1beta1().PodMetricses(deploymentObj.Namespace).List(ctx, metav1.ListOptions{})
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if err != nil {
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t.Logf("unable to list podmetricses: %v", err)
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return false, nil
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}
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for _, podMetrics := range podItems.Items {
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for _, container := range podMetrics.Containers {
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if _, exists := container.Usage[v1.ResourceCPU]; !exists {
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continue
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}
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totalCpu.Add(container.Usage[v1.ResourceCPU])
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}
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}
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// Value() will round up (e.g. 3.1 -> 4), which is still ok
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t.Logf("Waiting for totalCpu to get to 3 at least, got %v\n", totalCpu.Value())
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return totalCpu.Value() >= 3, nil
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}); err != nil {
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t.Fatalf("Error waiting for node/pod metrics: %v", err)
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}
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preRunNames := sets.NewString(getCurrentPodNames(ctx, clientSet, testNamespace.Name, t)...)
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// Deploy the descheduler with the configured policy
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createPolicyConfigMap(t, ctx, clientSet, lowNodeUtilizationPolicy(tc.lowNodeUtilizationArgs, tc.evictorArgs, tc.metricsCollectorEnabled))
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deschedulerDeploymentObj := deschedulerDeployment(testNamespace.Name)
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createDeschedulerDeploymentWithCleanup(t, ctx, clientSet, deschedulerDeploymentObj)
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// Run LowNodeUtilization plugin
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var meetsExpectations bool
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var actualEvictedPodCount int
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if err = wait.PollUntilContextTimeout(ctx, 5*time.Second, 60*time.Second, true, func(ctx context.Context) (bool, error) {
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currentRunNames := sets.NewString(getCurrentPodNames(ctx, clientSet, testNamespace.Name, t)...)
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actualEvictedPod := preRunNames.Difference(currentRunNames)
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actualEvictedPodCount = actualEvictedPod.Len()
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t.Logf("preRunNames: %v, currentRunNames: %v, actualEvictedPodCount: %v\n", preRunNames.List(), currentRunNames.List(), actualEvictedPodCount)
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if actualEvictedPodCount != tc.expectedEvictedPodCount {
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t.Logf("Expecting %v number of pods evicted, got %v instead", tc.expectedEvictedPodCount, actualEvictedPodCount)
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return false, nil
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}
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meetsExpectations = true
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return true, nil
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}); err != nil {
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t.Errorf("Error waiting for descheduler running: %v", err)
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}
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if !meetsExpectations {
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t.Errorf("Unexpected number of pods have been evicted, got %v, expected %v", actualEvictedPodCount, tc.expectedEvictedPodCount)
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} else {
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t.Logf("Total of %d Pods were evicted for %s", actualEvictedPodCount, tc.name)
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}
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})
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}
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}
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