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328 lines
12 KiB
Go
328 lines
12 KiB
Go
/*
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Copyright 2016 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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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/api/v1"
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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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const (
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postTestConditionMonitoringPeriod = 2 * time.Minute
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evictionPollInterval = 2 * time.Second
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// pressure conditions often surface after evictions because of delay in propegation of metrics to pressure
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// we wait this period after evictions to make sure that we wait out this delay
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pressureDelay = 20 * time.Second
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)
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var _ = framework.KubeDescribe("InodeEviction [Slow] [Serial] [Disruptive] [Flaky]", func() {
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f := framework.NewDefaultFramework("inode-eviction-test")
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podTestSpecs := []podTestSpec{
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{
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evictionPriority: 1, // This pod should be evicted before the normal memory usage pod
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pod: v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "container-inode-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-inode-hog-pod",
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Command: []string{
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"sh",
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"-c", // Make 100 billion small files (more than we have inodes)
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"i=0; while [[ $i -lt 100000000000 ]]; do touch smallfile$i.txt; sleep 0.001; i=$((i+=1)); 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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evictionPriority: 1, // This pod should be evicted before the normal memory usage pod
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pod: v1.Pod{
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ObjectMeta: metav1.ObjectMeta{Name: "volume-inode-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: "volume-inode-hog-pod",
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Command: []string{
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"sh",
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"-c", // Make 100 billion small files (more than we have inodes)
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"i=0; while [[ $i -lt 100000000000 ]]; do touch /test-empty-dir-mnt/smallfile$i.txt; sleep 0.001; i=$((i+=1)); done;",
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},
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VolumeMounts: []v1.VolumeMount{
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{MountPath: "/test-empty-dir-mnt", Name: "test-empty-dir"},
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},
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},
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},
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Volumes: []v1.Volume{
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{Name: "test-empty-dir", VolumeSource: v1.VolumeSource{EmptyDir: &v1.EmptyDirVolumeSource{}}},
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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: "normal-memory-usage-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: "normal-memory-usage-pod",
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Command: []string{
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"sh",
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"-c", //make one big (5 Gb) file
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"dd if=/dev/urandom of=largefile bs=5000000000 count=1; 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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evictionTestTimeout := 30 * time.Minute
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testCondition := "Disk Pressure due to Inodes"
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// Set the EvictionHard threshold lower to decrease test time
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evictionHardLimit := "nodefs.inodesFree<50%"
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runEvictionTest(f, testCondition, podTestSpecs, evictionHardLimit, evictionTestTimeout, hasInodePressure)
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})
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// Struct used by runEvictionTest that specifies the pod, and when that pod should be evicted, relative to other pods
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type podTestSpec struct {
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// 0 should never be evicted, 1 shouldn't evict before 2, etc.
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// If two are ranked at 1, either is permitted to fail before the other.
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// The test ends when all other than the 0 have been evicted
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evictionPriority int
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pod v1.Pod
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}
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// runEvictionTest sets up a testing environment given the provided nodes, and checks a few things:
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// It ensures that the desired testCondition is actually triggered.
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// It ensures that evictionPriority 0 pods are not evicted
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// It ensures that lower evictionPriority pods are always evicted before higher evictionPriority pods (2 evicted before 1, etc.)
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// It ensures that all lower evictionPriority pods are eventually evicted.
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// runEvictionTest then cleans up the testing environment by deleting provided nodes, and ensures that testCondition no longer exists
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func runEvictionTest(f *framework.Framework, testCondition string, podTestSpecs []podTestSpec, evictionHard string,
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evictionTestTimeout time.Duration, hasPressureCondition func(*framework.Framework, string) (bool, error)) {
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Context(fmt.Sprintf("when we run containers that should cause %s", testCondition), func() {
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tempSetEvictionHard(f, evictionHard)
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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 podTestSpecs {
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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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Eventually(func() error {
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hasPressure, err := hasPressureCondition(f, 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, 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, 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")
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Consistently(func() error {
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hasPressure, err := hasPressureCondition(f, 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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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 podTestSpecs {
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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{}, podDisappearTimeout)
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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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}
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// Returns TRUE if the node has disk pressure due to inodes exists on the node, FALSE otherwise
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func hasInodePressure(f *framework.Framework, testCondition string) (bool, error) {
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nodeList, err := f.ClientSet.Core().Nodes().List(metav1.ListOptions{})
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framework.ExpectNoError(err, "getting node list")
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if len(nodeList.Items) != 1 {
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return false, fmt.Errorf("expected 1 node, but see %d. List: %v", len(nodeList.Items), nodeList.Items)
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}
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_, pressure := v1.GetNodeCondition(&nodeList.Items[0].Status, v1.NodeDiskPressure)
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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 Inodes
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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.Inodes != nil && summary.Node.Runtime.ImageFs.InodesFree != nil {
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framework.Logf("imageFsInfo.Inodes: %d, imageFsInfo.InodesFree: %d", *summary.Node.Runtime.ImageFs.Inodes, *summary.Node.Runtime.ImageFs.InodesFree)
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}
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if summary.Node.Fs != nil && summary.Node.Fs.Inodes != nil && summary.Node.Fs.InodesFree != nil {
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framework.Logf("rootFsInfo.Inodes: %d, rootFsInfo.InodesFree: %d", *summary.Node.Fs.Inodes, *summary.Node.Fs.InodesFree)
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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.InodesUsed != nil {
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framework.Logf("--- summary Container: %s inodeUsage: %d", container.Name, *container.Rootfs.InodesUsed)
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}
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}
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for _, volume := range pod.VolumeStats {
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if volume.FsStats.InodesUsed != nil {
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framework.Logf("--- summary Volume: %s inodeUsage: %d", volume.Name, *volume.FsStats.InodesUsed)
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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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