326 lines
12 KiB
Go
326 lines
12 KiB
Go
/*
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Copyright 2020 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 node
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import (
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"context"
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"fmt"
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"testing"
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"time"
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v1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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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/apiserver/pkg/admission"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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restclient "k8s.io/client-go/rest"
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podutil "k8s.io/kubernetes/pkg/api/v1/pod"
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"k8s.io/kubernetes/pkg/controller/nodelifecycle"
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"k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds"
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"k8s.io/kubernetes/plugin/pkg/admission/podtolerationrestriction"
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pluginapi "k8s.io/kubernetes/plugin/pkg/admission/podtolerationrestriction/apis/podtolerationrestriction"
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testutils "k8s.io/kubernetes/test/integration/util"
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imageutils "k8s.io/kubernetes/test/utils/image"
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)
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// poll is how often to poll pods, nodes and claims.
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const poll = 2 * time.Second
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type podCondition func(pod *v1.Pod) (bool, error)
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// TestTaintBasedEvictions tests related cases for the TaintBasedEvictions feature
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func TestTaintBasedEvictions(t *testing.T) {
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// we need at least 2 nodes to prevent lifecycle manager from entering "fully-disrupted" mode
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nodeCount := 3
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zero := int64(0)
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gracePeriod := int64(1)
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heartbeatInternal := time.Second * 2
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testPod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "testpod1", DeletionGracePeriodSeconds: &zero},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{Name: "container", Image: imageutils.GetPauseImageName()},
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},
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Tolerations: []v1.Toleration{
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{
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Key: v1.TaintNodeNotReady,
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Operator: v1.TolerationOpExists,
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Effect: v1.TaintEffectNoExecute,
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},
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},
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TerminationGracePeriodSeconds: &gracePeriod,
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},
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}
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tolerationSeconds := []int64{200, 300, 0}
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tests := []struct {
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name string
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nodeTaints []v1.Taint
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nodeConditions []v1.NodeCondition
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pod *v1.Pod
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expectedWaitForPodCondition string
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}{
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{
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name: "Taint based evictions for NodeNotReady and 200 tolerationseconds",
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nodeTaints: []v1.Taint{{Key: v1.TaintNodeNotReady, Effect: v1.TaintEffectNoExecute}},
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nodeConditions: []v1.NodeCondition{{Type: v1.NodeReady, Status: v1.ConditionFalse}},
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pod: testPod,
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expectedWaitForPodCondition: "updated with tolerationSeconds of 200",
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},
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{
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name: "Taint based evictions for NodeNotReady with no pod tolerations",
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nodeTaints: []v1.Taint{{Key: v1.TaintNodeNotReady, Effect: v1.TaintEffectNoExecute}},
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nodeConditions: []v1.NodeCondition{{Type: v1.NodeReady, Status: v1.ConditionFalse}},
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pod: &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "testpod1"},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{Name: "container", Image: imageutils.GetPauseImageName()},
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},
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},
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},
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expectedWaitForPodCondition: "updated with tolerationSeconds=300",
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},
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{
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name: "Taint based evictions for NodeNotReady and 0 tolerationseconds",
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nodeTaints: []v1.Taint{{Key: v1.TaintNodeNotReady, Effect: v1.TaintEffectNoExecute}},
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nodeConditions: []v1.NodeCondition{{Type: v1.NodeReady, Status: v1.ConditionFalse}},
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pod: testPod,
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expectedWaitForPodCondition: "terminating",
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},
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{
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name: "Taint based evictions for NodeUnreachable",
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nodeTaints: []v1.Taint{{Key: v1.TaintNodeUnreachable, Effect: v1.TaintEffectNoExecute}},
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nodeConditions: []v1.NodeCondition{{Type: v1.NodeReady, Status: v1.ConditionUnknown}},
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},
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}
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// Build admission chain handler.
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podTolerations := podtolerationrestriction.NewPodTolerationsPlugin(&pluginapi.Configuration{})
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admission := admission.NewChainHandler(
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podTolerations,
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defaulttolerationseconds.NewDefaultTolerationSeconds(),
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)
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for i, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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testCtx := testutils.InitTestAPIServer(t, "taint-based-evictions", admission)
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// Build clientset and informers for controllers.
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externalClientConfig := restclient.CopyConfig(testCtx.KubeConfig)
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externalClientConfig.QPS = -1
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externalClientset := clientset.NewForConfigOrDie(externalClientConfig)
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externalInformers := informers.NewSharedInformerFactory(externalClientset, time.Second)
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podTolerations.SetExternalKubeClientSet(externalClientset)
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podTolerations.SetExternalKubeInformerFactory(externalInformers)
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testCtx = testutils.InitTestScheduler(t, testCtx)
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defer testutils.CleanupTest(t, testCtx)
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cs := testCtx.ClientSet
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// Start NodeLifecycleController for taint.
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nc, err := nodelifecycle.NewNodeLifecycleController(
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testCtx.Ctx,
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externalInformers.Coordination().V1().Leases(),
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externalInformers.Core().V1().Pods(),
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externalInformers.Core().V1().Nodes(),
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externalInformers.Apps().V1().DaemonSets(),
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cs,
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5*time.Second, // Node monitor grace period
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time.Minute, // Node startup grace period
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time.Millisecond, // Node monitor period
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time.Second, // Pod eviction timeout
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100, // Eviction limiter QPS
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100, // Secondary eviction limiter QPS
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50, // Large cluster threshold
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0.55, // Unhealthy zone threshold
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true, // Run taint manager
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)
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if err != nil {
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t.Errorf("Failed to create node controller: %v", err)
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return
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}
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// Waiting for all controllers to sync
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externalInformers.Start(testCtx.Ctx.Done())
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externalInformers.WaitForCacheSync(testCtx.Ctx.Done())
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testutils.SyncInformerFactory(testCtx)
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// Run all controllers
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go nc.Run(testCtx.Ctx)
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go testCtx.Scheduler.Run(testCtx.Ctx)
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nodeRes := v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("4000m"),
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v1.ResourceMemory: resource.MustParse("16Gi"),
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v1.ResourcePods: resource.MustParse("110"),
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}
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var nodes []*v1.Node
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for i := 0; i < nodeCount; i++ {
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nodes = append(nodes, &v1.Node{
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ObjectMeta: metav1.ObjectMeta{
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Name: fmt.Sprintf("node-%d", i),
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Labels: map[string]string{v1.LabelTopologyRegion: "region1", v1.LabelTopologyZone: "zone1"},
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},
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Spec: v1.NodeSpec{},
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Status: v1.NodeStatus{
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Capacity: nodeRes,
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Allocatable: nodeRes,
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Conditions: []v1.NodeCondition{
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{
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Type: v1.NodeReady,
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Status: v1.ConditionTrue,
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LastHeartbeatTime: metav1.Now(),
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},
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},
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},
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})
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if _, err := cs.CoreV1().Nodes().Create(context.TODO(), nodes[i], metav1.CreateOptions{}); err != nil {
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t.Errorf("Failed to create node, err: %v", err)
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}
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}
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neededNode := nodes[1]
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if test.pod != nil {
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test.pod.Name = fmt.Sprintf("testpod-%d", i)
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if len(test.pod.Spec.Tolerations) > 0 {
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test.pod.Spec.Tolerations[0].TolerationSeconds = &tolerationSeconds[i]
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}
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test.pod, err = cs.CoreV1().Pods(testCtx.NS.Name).Create(context.TODO(), test.pod, metav1.CreateOptions{})
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if err != nil {
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t.Fatalf("Test Failed: error: %v, while creating pod", err)
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}
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if err := testutils.WaitForPodToSchedule(cs, test.pod); err != nil {
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t.Errorf("Failed to schedule pod %s/%s on the node, err: %v",
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test.pod.Namespace, test.pod.Name, err)
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}
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test.pod, err = cs.CoreV1().Pods(testCtx.NS.Name).Get(context.TODO(), test.pod.Name, metav1.GetOptions{})
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if err != nil {
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t.Fatalf("Test Failed: error: %v, while creating pod", err)
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}
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neededNode, err = cs.CoreV1().Nodes().Get(context.TODO(), test.pod.Spec.NodeName, metav1.GetOptions{})
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if err != nil {
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t.Fatalf("Error while getting node associated with pod %v with err %v", test.pod.Name, err)
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}
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}
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// Regularly send heartbeat event to APIServer so that the cluster doesn't enter fullyDisruption mode.
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// TODO(Huang-Wei): use "NodeDisruptionExclusion" feature to simply the below logic when it's beta.
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for i := 0; i < nodeCount; i++ {
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var conditions []v1.NodeCondition
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// If current node is not <neededNode>
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if neededNode.Name != nodes[i].Name {
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conditions = []v1.NodeCondition{
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{
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Type: v1.NodeReady,
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Status: v1.ConditionTrue,
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},
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}
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} else {
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c, err := testutils.NodeReadyStatus(test.nodeConditions)
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if err != nil {
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t.Error(err)
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}
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// Need to distinguish NodeReady/False and NodeReady/Unknown.
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// If we try to update the node with condition NotReady/False, i.e. expect a NotReady:NoExecute taint
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// we need to keep sending the update event to keep it alive, rather than just sending once.
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if c == v1.ConditionFalse {
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conditions = test.nodeConditions
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} else if c == v1.ConditionUnknown {
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// If it's expected to update the node with condition NotReady/Unknown,
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// i.e. expect a Unreachable:NoExecute taint,
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// we need to only send the update event once to simulate the network unreachable scenario.
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nodeCopy := testutils.NodeCopyWithConditions(nodes[i], test.nodeConditions)
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if err := testutils.UpdateNodeStatus(cs, nodeCopy); err != nil && !apierrors.IsNotFound(err) {
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t.Errorf("Cannot update node: %v", err)
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}
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continue
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}
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}
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// Keeping sending NodeReady/True or NodeReady/False events.
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go func(i int) {
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for {
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select {
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case <-testCtx.Ctx.Done():
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return
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case <-time.Tick(heartbeatInternal):
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nodeCopy := testutils.NodeCopyWithConditions(nodes[i], conditions)
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if err := testutils.UpdateNodeStatus(cs, nodeCopy); err != nil && !apierrors.IsNotFound(err) {
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t.Errorf("Cannot update node: %v", err)
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}
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}
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}
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}(i)
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}
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if err := testutils.WaitForNodeTaints(cs, neededNode, test.nodeTaints); err != nil {
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t.Errorf("Failed to taint node in test %d <%s>, err: %v", i, neededNode.Name, err)
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}
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if test.pod != nil {
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err = waitForPodCondition(cs, testCtx.NS.Name, test.pod.Name, test.expectedWaitForPodCondition, time.Second*15, func(pod *v1.Pod) (bool, error) {
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// as node is unreachable, pod0 is expected to be in Terminating status
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// rather than getting deleted
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if tolerationSeconds[i] == 0 {
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return pod.DeletionTimestamp != nil, nil
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}
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if seconds, err := testutils.GetTolerationSeconds(pod.Spec.Tolerations); err == nil {
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return seconds == tolerationSeconds[i], nil
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}
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return false, nil
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}, t)
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if err != nil {
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pod, _ := cs.CoreV1().Pods(testCtx.NS.Name).Get(context.TODO(), test.pod.Name, metav1.GetOptions{})
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t.Fatalf("Error: %v, Expected test pod to be %s but it's %v", err, test.expectedWaitForPodCondition, pod)
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}
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testutils.CleanupPods(cs, t, []*v1.Pod{test.pod})
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}
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testutils.CleanupNodes(cs, t)
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testutils.WaitForSchedulerCacheCleanup(testCtx.Scheduler, t)
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})
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}
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}
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// waitForPodCondition waits a pods to be matched to the given condition.
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func waitForPodCondition(c clientset.Interface, ns, podName, desc string, timeout time.Duration, condition podCondition, t *testing.T) error {
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t.Logf("Waiting up to %v for pod %q in namespace %q to be %q", timeout, podName, ns, desc)
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for start := time.Now(); time.Since(start) < timeout; time.Sleep(poll) {
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pod, err := c.CoreV1().Pods(ns).Get(context.TODO(), podName, metav1.GetOptions{})
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if err != nil {
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if apierrors.IsNotFound(err) {
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t.Logf("Pod %q in namespace %q not found. Error: %v", podName, ns, err)
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return err
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}
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t.Logf("Get pod %q in namespace %q failed, ignoring for %v. Error: %v", podName, ns, poll, err)
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continue
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}
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// log now so that current pod info is reported before calling `condition()`
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t.Logf("Pod %q: Phase=%q, Reason=%q, readiness=%t. Elapsed: %v",
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podName, pod.Status.Phase, pod.Status.Reason, podutil.IsPodReady(pod), time.Since(start))
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if done, err := condition(pod); done {
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if err == nil {
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t.Logf("Pod %q satisfied condition %q", podName, desc)
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}
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return err
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}
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}
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return fmt.Errorf("gave up after waiting %v for pod %q to be %q", timeout, podName, desc)
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}
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