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259 lines
8.2 KiB
Go
259 lines
8.2 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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"strings"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/uuid"
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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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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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)
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const (
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// podCheckInterval is the interval seconds between pod status checks.
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podCheckInterval = time.Second * 2
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// containerGCPeriod is the period of container garbage collect loop. It should be the same
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// with ContainerGCPeriod in kubelet.go. However we don't want to include kubelet package
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// directly which will introduce a lot more dependencies.
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containerGCPeriod = time.Minute * 1
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dummyFile = "dummy."
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)
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// TODO: Leverage dynamic Kubelet settings when it's implemented to only modify the kubelet eviction option in this test.
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var _ = framework.KubeDescribe("Kubelet Eviction Manager [Serial] [Disruptive]", func() {
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f := framework.NewDefaultFramework("kubelet-eviction-manager")
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var podClient *framework.PodClient
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var c clientset.Interface
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BeforeEach(func() {
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podClient = f.PodClient()
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c = f.ClientSet
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})
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Describe("hard eviction test", func() {
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Context("pod using the most disk space gets evicted when the node disk usage is above the eviction hard threshold", func() {
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var busyPodName, idlePodName, verifyPodName string
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BeforeEach(func() {
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if !isImageSupported() {
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framework.Skipf("test skipped because the image is not supported by the test")
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}
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if !evictionOptionIsSet() {
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framework.Skipf("test skipped because eviction option is not set")
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}
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busyPodName = "to-evict" + string(uuid.NewUUID())
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idlePodName = "idle" + string(uuid.NewUUID())
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verifyPodName = "verify" + string(uuid.NewUUID())
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createIdlePod(idlePodName, podClient)
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podClient.Create(&v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: busyPodName,
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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: "gcr.io/google_containers/busybox:1.24",
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Name: busyPodName,
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// Filling the disk
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Command: []string{"sh", "-c",
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fmt.Sprintf("for NUM in `seq 1 1 100000`; do dd if=/dev/urandom of=%s.$NUM bs=50000000 count=10; sleep 0.5; done",
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dummyFile)},
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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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if !isImageSupported() || !evictionOptionIsSet() { // Skip the after each
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return
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}
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podClient.DeleteSync(busyPodName, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
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podClient.DeleteSync(idlePodName, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
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podClient.DeleteSync(verifyPodName, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
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// Wait for 2 container gc loop to ensure that the containers are deleted. The containers
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// created in this test consume a lot of disk, we don't want them to trigger disk eviction
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// again after the test.
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time.Sleep(containerGCPeriod * 2)
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if framework.TestContext.PrepullImages {
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// The disk eviction test may cause the prepulled images to be evicted,
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// prepull those images again to ensure this test not affect following tests.
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PrePullAllImages()
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}
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})
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It("should evict the pod using the most disk space [Slow]", func() {
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evictionOccurred := false
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nodeDiskPressureCondition := false
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podRescheduleable := false
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Eventually(func() error {
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// Avoid the test using up all the disk space
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err := checkDiskUsage(0.05)
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if err != nil {
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return err
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}
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// The pod should be evicted.
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if !evictionOccurred {
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podData, err := podClient.Get(busyPodName, metav1.GetOptions{})
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if err != nil {
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return err
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}
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err = verifyPodEviction(podData)
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if err != nil {
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return err
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}
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podData, err = podClient.Get(idlePodName, metav1.GetOptions{})
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if err != nil {
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return err
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}
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if podData.Status.Phase != v1.PodRunning {
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err = verifyPodEviction(podData)
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if err != nil {
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return err
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}
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}
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evictionOccurred = true
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return fmt.Errorf("waiting for node disk pressure condition to be set")
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}
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// The node should have disk pressure condition after the pods are evicted.
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if !nodeDiskPressureCondition {
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if !nodeHasDiskPressure(f.ClientSet) {
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return fmt.Errorf("expected disk pressure condition is not set")
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}
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nodeDiskPressureCondition = true
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return fmt.Errorf("waiting for node disk pressure condition to be cleared")
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}
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// After eviction happens the pod is evicted so eventually the node disk pressure should be relieved.
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if !podRescheduleable {
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if nodeHasDiskPressure(f.ClientSet) {
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return fmt.Errorf("expected disk pressure condition relief has not happened")
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}
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createIdlePod(verifyPodName, podClient)
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podRescheduleable = true
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return fmt.Errorf("waiting for the node to accept a new pod")
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}
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// The new pod should be able to be scheduled and run after the disk pressure is relieved.
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podData, err := podClient.Get(verifyPodName, metav1.GetOptions{})
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if err != nil {
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return err
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}
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if podData.Status.Phase != v1.PodRunning {
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return fmt.Errorf("waiting for the new pod to be running")
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}
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return nil
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}, time.Minute*15 /* based on n1-standard-1 machine type */, podCheckInterval).Should(BeNil())
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})
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})
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})
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})
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func createIdlePod(podName string, podClient *framework.PodClient) {
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podClient.Create(&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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func verifyPodEviction(podData *v1.Pod) error {
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if podData.Status.Phase != v1.PodFailed {
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return fmt.Errorf("expected phase to be failed. got %+v", podData.Status.Phase)
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}
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if podData.Status.Reason != "Evicted" {
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return fmt.Errorf("expected failed reason to be evicted. got %+v", podData.Status.Reason)
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}
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return nil
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}
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func nodeHasDiskPressure(cs clientset.Interface) bool {
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nodeList := framework.GetReadySchedulableNodesOrDie(cs)
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for _, condition := range nodeList.Items[0].Status.Conditions {
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if condition.Type == v1.NodeDiskPressure {
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return condition.Status == v1.ConditionTrue
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}
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}
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return false
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}
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func evictionOptionIsSet() bool {
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return len(framework.TestContext.KubeletConfig.EvictionHard) > 0
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}
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// TODO(random-liu): Use OSImage in node status to do the check.
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func isImageSupported() bool {
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// TODO: Only images with image fs is selected for testing for now. When the kubelet settings can be dynamically updated,
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// instead of skipping images the eviction thresholds should be adjusted based on the images.
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return strings.Contains(framework.TestContext.NodeName, "-gci-dev-")
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}
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// checkDiskUsage verifies that the available bytes on disk are above the limit.
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func checkDiskUsage(limit float64) error {
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summary, err := getNodeSummary()
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if err != nil {
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return err
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}
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if nodeFs := summary.Node.Fs; nodeFs != nil {
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if nodeFs.AvailableBytes != nil && nodeFs.CapacityBytes != nil {
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if float64(*nodeFs.CapacityBytes)*limit > float64(*nodeFs.AvailableBytes) {
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return fmt.Errorf("available nodefs byte is less than %v%%", limit*float64(100))
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}
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}
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}
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if summary.Node.Runtime != nil {
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if imageFs := summary.Node.Runtime.ImageFs; imageFs != nil {
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if float64(*imageFs.CapacityBytes)*limit > float64(*imageFs.AvailableBytes) {
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return fmt.Errorf("available imagefs byte is less than %v%%", limit*float64(100))
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}
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}
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}
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return nil
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}
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