mirror of
https://github.com/k3s-io/kubernetes.git
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323 lines
11 KiB
Go
323 lines
11 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_node
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import (
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"fmt"
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"time"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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nodeutil "k8s.io/kubernetes/pkg/api/v1/node"
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"k8s.io/kubernetes/pkg/apis/componentconfig"
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"k8s.io/kubernetes/test/e2e/framework"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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// Eviction Policy is described here:
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// https://github.com/kubernetes/kubernetes/blob/master/docs/proposals/kubelet-eviction.md
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var _ = framework.KubeDescribe("LocalStorageAllocatableEviction [Slow] [Serial] [Disruptive] [Flaky]", func() {
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f := framework.NewDefaultFramework("localstorageallocatable-eviction-test")
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evictionTestTimeout := 15 * time.Minute
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testCondition := "Evict pod due to local storage allocatable violation"
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conditionType := v1.NodeDiskPressure
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var podTestSpecs []podTestSpec
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//podTestSpecsS := make([]podTestSpec, 5)
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var diskReserve uint64
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Context(fmt.Sprintf("when we run containers that should cause %s", testCondition), func() {
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BeforeEach(func() {
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diskAvail, err := getDiskUsage()
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if err != nil {
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framework.ExpectNoError(err)
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}
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diskReserve = uint64(0.8 * diskAvail / 1000000) // Reserve 0.8 * disk Capacity for kube-reserved scratch storage
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maxDisk := 10000000 // Set dd command to read and write up to 10MB at a time
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count := uint64(0.8 * diskAvail / float64(maxDisk))
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command := fmt.Sprintf("dd if=/dev/urandom of=dummy bs=%d count=%d; sleep 0.5; while true; do sleep 5; done", maxDisk, count)
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podTestSpecs = []podTestSpec{
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{
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evictionPriority: 1, // This pod should be evicted before the innocent pod
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pod: &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "container-disk-hog-pod"},
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Spec: v1.PodSpec{
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RestartPolicy: v1.RestartPolicyNever,
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Containers: []v1.Container{
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{
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Image: "gcr.io/google_containers/busybox:1.24",
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Name: "container-disk-hog-pod",
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Command: []string{"sh", "-c", command},
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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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evictionPriority: 0, // This pod should never be evicted
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pod: &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "idle-pod"},
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Spec: v1.PodSpec{
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RestartPolicy: v1.RestartPolicyNever,
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Containers: []v1.Container{
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{
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Image: "gcr.io/google_containers/busybox:1.24",
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Name: "idle-pod",
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Command: []string{"sh", "-c",
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fmt.Sprintf("while true; do sleep 5; done")},
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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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// Set up --kube-reserved for scratch storage
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tempSetCurrentKubeletConfig(f, func(initialConfig *componentconfig.KubeletConfiguration) {
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framework.Logf("Set up --kube-reserved for local storage reserved %dMi", diskReserve)
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initialConfig.KubeReserved = componentconfig.ConfigurationMap(map[string]string{"storage": fmt.Sprintf("%dMi", diskReserve)})
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})
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// Place the remainder of the test within a context so that the kubelet config is set before and after the test.
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Context("With kubeconfig updated", func() {
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runLocalStorageEvictionTest(f, conditionType, testCondition, &podTestSpecs, evictionTestTimeout, hasDiskPressure)
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})
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})
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})
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// Returns TRUE if the node has disk pressure, FALSE otherwise
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func hasDiskPressure(f *framework.Framework, conditionType v1.NodeConditionType, testCondition string) (bool, error) {
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localNodeStatus := getLocalNode(f).Status
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_, pressure := nodeutil.GetNodeCondition(&localNodeStatus, conditionType)
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Expect(pressure).NotTo(BeNil())
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hasPressure := pressure.Status == v1.ConditionTrue
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By(fmt.Sprintf("checking if pod has %s: %v", testCondition, hasPressure))
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// Additional Logging relating to disk
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summary, err := getNodeSummary()
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if err != nil {
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return false, err
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}
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if summary.Node.Runtime != nil && summary.Node.Runtime.ImageFs != nil && summary.Node.Runtime.ImageFs.UsedBytes != nil {
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framework.Logf("imageFsInfo.UsedBytes: %d", *summary.Node.Runtime.ImageFs.UsedBytes)
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}
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if summary.Node.Fs != nil && summary.Node.Fs.UsedBytes != nil {
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framework.Logf("rootFsInfo.UsedBytes: %d", *summary.Node.Fs.UsedBytes)
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}
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for _, pod := range summary.Pods {
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framework.Logf("Pod: %s", pod.PodRef.Name)
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for _, container := range pod.Containers {
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if container.Rootfs != nil && container.Rootfs.UsedBytes != nil {
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framework.Logf("--- summary Container: %s UsedBytes: %d", container.Name, *container.Rootfs.UsedBytes)
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}
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}
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for _, volume := range pod.VolumeStats {
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if volume.FsStats.UsedBytes != nil {
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framework.Logf("--- summary Volume: %s UsedBytes: %d", volume.Name, *volume.FsStats.UsedBytes)
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}
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}
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}
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return hasPressure, nil
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}
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// Pass podTestSpecsP as references so that it could be set up in the first BeforeEach clause
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func runLocalStorageEvictionTest(f *framework.Framework, conditionType v1.NodeConditionType, testCondition string, podTestSpecsP *[]podTestSpec, evictionTestTimeout time.Duration,
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hasPressureCondition func(*framework.Framework, v1.NodeConditionType, string) (bool, error)) {
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BeforeEach(func() {
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By("seting up pods to be used by tests")
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for _, spec := range *podTestSpecsP {
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By(fmt.Sprintf("creating pod with container: %s", spec.pod.Name))
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f.PodClient().CreateSync(spec.pod)
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}
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})
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It(fmt.Sprintf("should eventually see %s, and then evict all of the correct pods", testCondition), func() {
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Expect(podTestSpecsP).NotTo(BeNil())
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podTestSpecs := *podTestSpecsP
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Eventually(func() error {
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hasPressure, err := hasPressureCondition(f, conditionType, testCondition)
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if err != nil {
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return err
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}
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if hasPressure {
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return nil
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}
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return fmt.Errorf("Condition: %s not encountered", testCondition)
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}, evictionTestTimeout, evictionPollInterval).Should(BeNil())
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Eventually(func() error {
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// Gather current information
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updatedPodList, err := f.ClientSet.Core().Pods(f.Namespace.Name).List(metav1.ListOptions{})
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updatedPods := updatedPodList.Items
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for _, p := range updatedPods {
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framework.Logf("fetching pod %s; phase= %v", p.Name, p.Status.Phase)
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}
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_, err = hasPressureCondition(f, conditionType, testCondition)
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if err != nil {
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return err
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}
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By("checking eviction ordering and ensuring important pods dont fail")
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done := true
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for _, priorityPodSpec := range podTestSpecs {
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var priorityPod v1.Pod
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for _, p := range updatedPods {
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if p.Name == priorityPodSpec.pod.Name {
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priorityPod = p
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}
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}
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Expect(priorityPod).NotTo(BeNil())
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// Check eviction ordering.
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// Note: it is alright for a priority 1 and priority 2 pod (for example) to fail in the same round
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for _, lowPriorityPodSpec := range podTestSpecs {
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var lowPriorityPod v1.Pod
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for _, p := range updatedPods {
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if p.Name == lowPriorityPodSpec.pod.Name {
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lowPriorityPod = p
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}
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}
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Expect(lowPriorityPod).NotTo(BeNil())
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if priorityPodSpec.evictionPriority < lowPriorityPodSpec.evictionPriority && lowPriorityPod.Status.Phase == v1.PodRunning {
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Expect(priorityPod.Status.Phase).NotTo(Equal(v1.PodFailed),
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fmt.Sprintf("%s pod failed before %s pod", priorityPodSpec.pod.Name, lowPriorityPodSpec.pod.Name))
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}
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}
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// EvictionPriority 0 pods should not fail
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if priorityPodSpec.evictionPriority == 0 {
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Expect(priorityPod.Status.Phase).NotTo(Equal(v1.PodFailed),
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fmt.Sprintf("%s pod failed (and shouldn't have failed)", priorityPod.Name))
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}
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// If a pod that is not evictionPriority 0 has not been evicted, we are not done
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if priorityPodSpec.evictionPriority != 0 && priorityPod.Status.Phase != v1.PodFailed {
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done = false
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}
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}
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if done {
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return nil
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}
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return fmt.Errorf("pods that caused %s have not been evicted.", testCondition)
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}, evictionTestTimeout, evictionPollInterval).Should(BeNil())
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// We observe pressure from the API server. The eviction manager observes pressure from the kubelet internal stats.
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// This means the eviction manager will observe pressure before we will, creating a delay between when the eviction manager
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// evicts a pod, and when we observe the pressure by querrying the API server. Add a delay here to account for this delay
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By("making sure pressure from test has surfaced before continuing")
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time.Sleep(pressureDelay)
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By("making sure conditions eventually return to normal")
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Eventually(func() error {
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hasPressure, err := hasPressureCondition(f, conditionType, testCondition)
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if err != nil {
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return err
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}
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if hasPressure {
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return fmt.Errorf("Conditions havent returned to normal, we still have %s", testCondition)
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}
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return nil
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}, evictionTestTimeout, evictionPollInterval).Should(BeNil())
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By("making sure conditions do not return, and that pods that shouldnt fail dont fail")
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Consistently(func() error {
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hasPressure, err := hasPressureCondition(f, conditionType, testCondition)
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if err != nil {
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// Race conditions sometimes occur when checking pressure condition due to #38710 (Docker bug)
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// Do not fail the test when this occurs, since this is expected to happen occasionally.
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framework.Logf("Failed to check pressure condition. Error: %v", err)
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return nil
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}
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if hasPressure {
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return fmt.Errorf("%s dissappeared and then reappeared", testCondition)
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}
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// Gather current information
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updatedPodList, _ := f.ClientSet.Core().Pods(f.Namespace.Name).List(metav1.ListOptions{})
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for _, priorityPodSpec := range podTestSpecs {
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// EvictionPriority 0 pods should not fail
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if priorityPodSpec.evictionPriority == 0 {
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for _, p := range updatedPodList.Items {
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if p.Name == priorityPodSpec.pod.Name && p.Status.Phase == v1.PodFailed {
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return fmt.Errorf("%s pod failed (delayed) and shouldn't have failed", p.Name)
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}
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}
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}
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}
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return nil
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}, postTestConditionMonitoringPeriod, evictionPollInterval).Should(BeNil())
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By("making sure we can start a new pod after the test")
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podName := "test-admit-pod"
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f.PodClient().CreateSync(&v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: podName,
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},
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Spec: v1.PodSpec{
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RestartPolicy: v1.RestartPolicyNever,
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Containers: []v1.Container{
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{
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Image: framework.GetPauseImageNameForHostArch(),
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Name: podName,
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},
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},
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},
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})
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})
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AfterEach(func() {
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By("deleting pods")
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for _, spec := range *podTestSpecsP {
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By(fmt.Sprintf("deleting pod: %s", spec.pod.Name))
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f.PodClient().DeleteSync(spec.pod.Name, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
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}
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if CurrentGinkgoTestDescription().Failed {
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if framework.TestContext.DumpLogsOnFailure {
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logPodEvents(f)
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logNodeEvents(f)
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}
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By("sleeping to allow for cleanup of test")
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time.Sleep(postTestConditionMonitoringPeriod)
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}
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})
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}
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func getDiskUsage() (float64, error) {
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summary, err := getNodeSummary()
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if err != nil {
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return 0, err
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}
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if nodeFs := summary.Node.Fs; nodeFs != nil {
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return float64(*nodeFs.AvailableBytes), nil
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}
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return 0, fmt.Errorf("fail to get nodefs available bytes")
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}
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