323 lines
11 KiB
Go
323 lines
11 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package e2e
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import (
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"fmt"
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"strconv"
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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/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/master/ports"
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"k8s.io/kubernetes/pkg/util/uuid"
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"k8s.io/kubernetes/test/e2e/framework"
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testutils "k8s.io/kubernetes/test/utils"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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// This test primarily checks 2 things:
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// 1. Daemons restart automatically within some sane time (10m).
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// 2. They don't take abnormal actions when restarted in the steady state.
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// - Controller manager shouldn't overshoot replicas
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// - Kubelet shouldn't restart containers
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// - Scheduler should continue assigning hosts to new pods
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const (
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restartPollInterval = 5 * time.Second
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restartTimeout = 10 * time.Minute
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numPods = 10
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sshPort = 22
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ADD = "ADD"
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DEL = "DEL"
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UPDATE = "UPDATE"
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)
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// nodeExec execs the given cmd on node via SSH. Note that the nodeName is an sshable name,
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// eg: the name returned by framework.GetMasterHost(). This is also not guaranteed to work across
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// cloud providers since it involves ssh.
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func nodeExec(nodeName, cmd string) (framework.SSHResult, error) {
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result, err := framework.SSH(cmd, fmt.Sprintf("%v:%v", nodeName, sshPort), framework.TestContext.Provider)
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Expect(err).NotTo(HaveOccurred())
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return result, err
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}
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// restartDaemonConfig is a config to restart a running daemon on a node, and wait till
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// it comes back up. It uses ssh to send a SIGTERM to the daemon.
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type restartDaemonConfig struct {
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nodeName string
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daemonName string
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healthzPort int
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pollInterval time.Duration
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pollTimeout time.Duration
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}
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// NewRestartConfig creates a restartDaemonConfig for the given node and daemon.
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func NewRestartConfig(nodeName, daemonName string, healthzPort int, pollInterval, pollTimeout time.Duration) *restartDaemonConfig {
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if !framework.ProviderIs("gce") {
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framework.Logf("WARNING: SSH through the restart config might not work on %s", framework.TestContext.Provider)
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}
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return &restartDaemonConfig{
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nodeName: nodeName,
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daemonName: daemonName,
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healthzPort: healthzPort,
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pollInterval: pollInterval,
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pollTimeout: pollTimeout,
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}
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}
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func (r *restartDaemonConfig) String() string {
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return fmt.Sprintf("Daemon %v on node %v", r.daemonName, r.nodeName)
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}
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// waitUp polls healthz of the daemon till it returns "ok" or the polling hits the pollTimeout
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func (r *restartDaemonConfig) waitUp() {
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framework.Logf("Checking if %v is up by polling for a 200 on its /healthz endpoint", r)
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healthzCheck := fmt.Sprintf(
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"curl -s -o /dev/null -I -w \"%%{http_code}\" http://localhost:%v/healthz", r.healthzPort)
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err := wait.Poll(r.pollInterval, r.pollTimeout, func() (bool, error) {
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result, err := nodeExec(r.nodeName, healthzCheck)
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framework.ExpectNoError(err)
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if result.Code == 0 {
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httpCode, err := strconv.Atoi(result.Stdout)
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if err != nil {
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framework.Logf("Unable to parse healthz http return code: %v", err)
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} else if httpCode == 200 {
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return true, nil
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}
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}
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framework.Logf("node %v exec command, '%v' failed with exitcode %v: \n\tstdout: %v\n\tstderr: %v",
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r.nodeName, healthzCheck, result.Code, result.Stdout, result.Stderr)
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return false, nil
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})
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framework.ExpectNoError(err, "%v did not respond with a 200 via %v within %v", r, healthzCheck, r.pollTimeout)
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}
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// kill sends a SIGTERM to the daemon
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func (r *restartDaemonConfig) kill() {
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framework.Logf("Killing %v", r)
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nodeExec(r.nodeName, fmt.Sprintf("pgrep %v | xargs -I {} sudo kill {}", r.daemonName))
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}
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// Restart checks if the daemon is up, kills it, and waits till it comes back up
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func (r *restartDaemonConfig) restart() {
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r.waitUp()
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r.kill()
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r.waitUp()
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}
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// podTracker records a serial history of events that might've affects pods.
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type podTracker struct {
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cache.ThreadSafeStore
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}
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func (p *podTracker) remember(pod *v1.Pod, eventType string) {
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if eventType == UPDATE && pod.Status.Phase == v1.PodRunning {
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return
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}
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p.Add(fmt.Sprintf("[%v] %v: %v", time.Now(), eventType, pod.Name), pod)
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}
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func (p *podTracker) String() (msg string) {
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for _, k := range p.ListKeys() {
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obj, exists := p.Get(k)
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if !exists {
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continue
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}
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pod := obj.(*v1.Pod)
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msg += fmt.Sprintf("%v Phase %v Host %v\n", k, pod.Status.Phase, pod.Spec.NodeName)
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}
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return
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}
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func newPodTracker() *podTracker {
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return &podTracker{cache.NewThreadSafeStore(
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cache.Indexers{}, cache.Indices{})}
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}
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// replacePods replaces content of the store with the given pods.
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func replacePods(pods []*v1.Pod, store cache.Store) {
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found := make([]interface{}, 0, len(pods))
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for i := range pods {
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found = append(found, pods[i])
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}
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framework.ExpectNoError(store.Replace(found, "0"))
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}
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// getContainerRestarts returns the count of container restarts across all pods matching the given labelSelector,
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// and a list of nodenames across which these containers restarted.
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func getContainerRestarts(c clientset.Interface, ns string, labelSelector labels.Selector) (int, []string) {
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options := metav1.ListOptions{LabelSelector: labelSelector.String()}
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pods, err := c.Core().Pods(ns).List(options)
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framework.ExpectNoError(err)
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failedContainers := 0
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containerRestartNodes := sets.NewString()
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for _, p := range pods.Items {
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for _, v := range testutils.FailedContainers(&p) {
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failedContainers = failedContainers + v.Restarts
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containerRestartNodes.Insert(p.Spec.NodeName)
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}
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}
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return failedContainers, containerRestartNodes.List()
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}
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var _ = framework.KubeDescribe("DaemonRestart [Disruptive]", func() {
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f := framework.NewDefaultFramework("daemonrestart")
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rcName := "daemonrestart" + strconv.Itoa(numPods) + "-" + string(uuid.NewUUID())
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labelSelector := labels.Set(map[string]string{"name": rcName}).AsSelector()
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existingPods := cache.NewStore(cache.MetaNamespaceKeyFunc)
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var ns string
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var config testutils.RCConfig
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var controller cache.Controller
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var newPods cache.Store
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var stopCh chan struct{}
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var tracker *podTracker
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BeforeEach(func() {
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// These tests require SSH
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framework.SkipUnlessProviderIs(framework.ProvidersWithSSH...)
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ns = f.Namespace.Name
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// All the restart tests need an rc and a watch on pods of the rc.
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// Additionally some of them might scale the rc during the test.
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config = testutils.RCConfig{
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Client: f.ClientSet,
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InternalClient: f.InternalClientset,
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Name: rcName,
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Namespace: ns,
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Image: framework.GetPauseImageName(f.ClientSet),
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Replicas: numPods,
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CreatedPods: &[]*v1.Pod{},
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}
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Expect(framework.RunRC(config)).NotTo(HaveOccurred())
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replacePods(*config.CreatedPods, existingPods)
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stopCh = make(chan struct{})
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tracker = newPodTracker()
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newPods, controller = cache.NewInformer(
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&cache.ListWatch{
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ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
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options.LabelSelector = labelSelector.String()
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obj, err := f.ClientSet.Core().Pods(ns).List(options)
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return runtime.Object(obj), err
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},
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WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
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options.LabelSelector = labelSelector.String()
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return f.ClientSet.Core().Pods(ns).Watch(options)
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},
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},
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&v1.Pod{},
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0,
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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tracker.remember(obj.(*v1.Pod), ADD)
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},
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UpdateFunc: func(oldObj, newObj interface{}) {
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tracker.remember(newObj.(*v1.Pod), UPDATE)
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},
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DeleteFunc: func(obj interface{}) {
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tracker.remember(obj.(*v1.Pod), DEL)
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},
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},
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)
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go controller.Run(stopCh)
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})
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AfterEach(func() {
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close(stopCh)
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})
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It("Controller Manager should not create/delete replicas across restart", func() {
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// Requires master ssh access.
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framework.SkipUnlessProviderIs("gce", "aws")
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restarter := NewRestartConfig(
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framework.GetMasterHost(), "kube-controller", ports.ControllerManagerPort, restartPollInterval, restartTimeout)
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restarter.restart()
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// The intent is to ensure the replication controller manager has observed and reported status of
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// the replication controller at least once since the manager restarted, so that we can determine
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// that it had the opportunity to create/delete pods, if it were going to do so. Scaling the RC
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// to the same size achieves this, because the scale operation advances the RC's sequence number
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// and awaits it to be observed and reported back in the RC's status.
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framework.ScaleRC(f.ClientSet, f.InternalClientset, ns, rcName, numPods, true)
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// Only check the keys, the pods can be different if the kubelet updated it.
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// TODO: Can it really?
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existingKeys := sets.NewString()
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newKeys := sets.NewString()
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for _, k := range existingPods.ListKeys() {
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existingKeys.Insert(k)
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}
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for _, k := range newPods.ListKeys() {
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newKeys.Insert(k)
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}
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if len(newKeys.List()) != len(existingKeys.List()) ||
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!newKeys.IsSuperset(existingKeys) {
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framework.Failf("RcManager created/deleted pods after restart \n\n %+v", tracker)
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}
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})
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It("Scheduler should continue assigning pods to nodes across restart", func() {
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// Requires master ssh access.
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framework.SkipUnlessProviderIs("gce", "aws")
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restarter := NewRestartConfig(
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framework.GetMasterHost(), "kube-scheduler", ports.SchedulerPort, restartPollInterval, restartTimeout)
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// Create pods while the scheduler is down and make sure the scheduler picks them up by
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// scaling the rc to the same size.
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restarter.waitUp()
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restarter.kill()
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// This is best effort to try and create pods while the scheduler is down,
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// since we don't know exactly when it is restarted after the kill signal.
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framework.ExpectNoError(framework.ScaleRC(f.ClientSet, f.InternalClientset, ns, rcName, numPods+5, false))
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restarter.waitUp()
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framework.ExpectNoError(framework.ScaleRC(f.ClientSet, f.InternalClientset, ns, rcName, numPods+5, true))
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})
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It("Kubelet should not restart containers across restart", func() {
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nodeIPs, err := framework.GetNodePublicIps(f.ClientSet)
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framework.ExpectNoError(err)
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preRestarts, badNodes := getContainerRestarts(f.ClientSet, ns, labelSelector)
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if preRestarts != 0 {
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framework.Logf("WARNING: Non-zero container restart count: %d across nodes %v", preRestarts, badNodes)
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}
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for _, ip := range nodeIPs {
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restarter := NewRestartConfig(
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ip, "kubelet", ports.KubeletReadOnlyPort, restartPollInterval, restartTimeout)
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restarter.restart()
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}
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postRestarts, badNodes := getContainerRestarts(f.ClientSet, ns, labelSelector)
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if postRestarts != preRestarts {
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framework.DumpNodeDebugInfo(f.ClientSet, badNodes, framework.Logf)
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framework.Failf("Net container restart count went from %v -> %v after kubelet restart on nodes %v \n\n %+v", preRestarts, postRestarts, badNodes, tracker)
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}
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})
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})
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