mirror of
https://github.com/k3s-io/kubernetes.git
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DaemonSet controller actively kills failed pods (to recreate them)
This commit is contained in:
Janet Kuo
parent
90b5d4cbd8
commit
a2e1341e01
@ -467,20 +467,34 @@ func (dsc *DaemonSetsController) manage(ds *extensions.DaemonSet) error {
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continue
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}
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daemonPods, isRunning := nodeToDaemonPods[node.Name]
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daemonPods, exists := nodeToDaemonPods[node.Name]
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switch {
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case shouldSchedule && !isRunning:
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case shouldSchedule && !exists:
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// If daemon pod is supposed to be running on node, but isn't, create daemon pod.
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nodesNeedingDaemonPods = append(nodesNeedingDaemonPods, node.Name)
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case shouldContinueRunning && len(daemonPods) > 1:
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// If daemon pod is supposed to be running on node, but more than 1 daemon pod is running, delete the excess daemon pods.
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// Sort the daemon pods by creation time, so the the oldest is preserved.
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sort.Sort(podByCreationTimestamp(daemonPods))
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for i := 1; i < len(daemonPods); i++ {
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podsToDelete = append(podsToDelete, daemonPods[i].Name)
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case shouldContinueRunning:
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// If a daemon pod failed, delete it
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// TODO: handle the case when the daemon pods fail consistently and causes kill-recreate hot loop
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var daemonPodsRunning []*v1.Pod
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for i := range daemonPods {
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daemon := daemonPods[i]
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if daemon.Status.Phase == v1.PodFailed {
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glog.V(2).Infof("Found failed daemon pod %s/%s, will try to kill it", daemon.Namespace, daemon.Name)
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podsToDelete = append(podsToDelete, daemon.Name)
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} else {
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daemonPodsRunning = append(daemonPodsRunning, daemon)
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}
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}
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case !shouldContinueRunning && isRunning:
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// If daemon pod is supposed to be running on node, but more than 1 daemon pod is running, delete the excess daemon pods.
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// Sort the daemon pods by creation time, so the oldest is preserved.
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if len(daemonPodsRunning) > 1 {
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sort.Sort(podByCreationTimestamp(daemonPodsRunning))
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for i := 1; i < len(daemonPodsRunning); i++ {
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podsToDelete = append(podsToDelete, daemonPods[i].Name)
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}
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}
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case !shouldContinueRunning && exists:
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// If daemon pod isn't supposed to run on node, but it is, delete all daemon pods on node.
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for i := range daemonPods {
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podsToDelete = append(podsToDelete, daemonPods[i].Name)
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@ -32,6 +32,7 @@ import (
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extensionsinternal "k8s.io/kubernetes/pkg/apis/extensions"
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extensions "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/kubectl"
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"k8s.io/kubernetes/test/e2e/framework"
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@ -59,6 +60,20 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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var f *framework.Framework
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AfterEach(func() {
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// Clean up
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daemonsets, err := f.ClientSet.Extensions().DaemonSets(f.Namespace.Name).List(metav1.ListOptions{})
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Expect(err).NotTo(HaveOccurred(), "unable to dump DaemonSets")
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if daemonsets != nil && len(daemonsets.Items) > 0 {
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for _, ds := range daemonsets.Items {
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By(fmt.Sprintf("Deleting DaemonSet %q with reaper", ds.Name))
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dsReaper, err := kubectl.ReaperFor(extensionsinternal.Kind("DaemonSet"), f.InternalClientset)
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Expect(err).NotTo(HaveOccurred())
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err = dsReaper.Stop(f.Namespace.Name, ds.Name, 0, nil)
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, ds.Spec.Template.Labels))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to be reaped")
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}
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}
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if daemonsets, err := f.ClientSet.Extensions().DaemonSets(f.Namespace.Name).List(metav1.ListOptions{}); err == nil {
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framework.Logf("daemonset: %s", runtime.EncodeOrDie(api.Codecs.LegacyCodec(api.Registry.EnabledVersions()...), daemonsets))
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} else {
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@ -69,7 +84,7 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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} else {
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framework.Logf("unable to dump pods: %v", err)
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}
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err := clearDaemonSetNodeLabels(f.ClientSet)
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err = clearDaemonSetNodeLabels(f.ClientSet)
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Expect(err).NotTo(HaveOccurred())
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})
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@ -92,38 +107,9 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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It("should run and stop simple daemon", func() {
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label := map[string]string{daemonsetNameLabel: dsName}
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framework.Logf("Creating simple daemon set %s", dsName)
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_, err := c.Extensions().DaemonSets(ns).Create(&extensions.DaemonSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: label,
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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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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By(fmt.Sprintf("Creating simple DaemonSet %q", dsName))
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_, err := c.Extensions().DaemonSets(ns).Create(newDaemonSet(dsName, image, label))
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Expect(err).NotTo(HaveOccurred())
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defer func() {
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framework.Logf("Check that reaper kills all daemon pods for %s", dsName)
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dsReaper, err := kubectl.ReaperFor(extensionsinternal.Kind("DaemonSet"), f.InternalClientset)
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Expect(err).NotTo(HaveOccurred())
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err = dsReaper.Stop(ns, dsName, 0, nil)
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to be reaped")
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}()
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By("Check that daemon pods launch on every node of the cluster.")
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Expect(err).NotTo(HaveOccurred())
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@ -133,48 +119,21 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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Expect(err).NotTo(HaveOccurred())
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By("Stop a daemon pod, check that the daemon pod is revived.")
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podClient := c.Core().Pods(ns)
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selector := labels.Set(label).AsSelector()
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options := metav1.ListOptions{LabelSelector: selector.String()}
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podList, err := podClient.List(options)
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Expect(err).NotTo(HaveOccurred())
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Expect(len(podList.Items)).To(BeNumerically(">", 0))
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podList := listDaemonPods(c, ns, label)
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pod := podList.Items[0]
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err = podClient.Delete(pod.Name, nil)
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err = c.Core().Pods(ns).Delete(pod.Name, nil)
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnAllNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to revive")
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})
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It("should run and stop complex daemon", func() {
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complexLabel := map[string]string{daemonsetNameLabel: dsName}
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nodeSelector := map[string]string{daemonsetColorLabel: "blue"}
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framework.Logf("Creating daemon with a node selector %s", dsName)
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_, err := c.Extensions().DaemonSets(ns).Create(&extensions.DaemonSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Selector: &metav1.LabelSelector{MatchLabels: complexLabel},
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: complexLabel,
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},
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Spec: v1.PodSpec{
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NodeSelector: nodeSelector,
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Containers: []v1.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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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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framework.Logf("Creating daemon %q with a node selector", dsName)
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ds := newDaemonSet(dsName, image, complexLabel)
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ds.Spec.Template.Spec.NodeSelector = nodeSelector
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_, err := c.Extensions().DaemonSets(ns).Create(ds)
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Expect(err).NotTo(HaveOccurred())
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By("Initially, daemon pods should not be running on any nodes.")
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@ -198,17 +157,14 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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Expect(err).NotTo(HaveOccurred(), "error removing labels on node")
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Expect(wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, complexLabel))).
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NotTo(HaveOccurred(), "error waiting for daemon pod to not be running on nodes")
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By("We should now be able to delete the daemon set.")
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Expect(c.Extensions().DaemonSets(ns).Delete(dsName, nil)).NotTo(HaveOccurred())
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})
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It("should run and stop complex daemon with node affinity", func() {
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complexLabel := map[string]string{daemonsetNameLabel: dsName}
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nodeSelector := map[string]string{daemonsetColorLabel: "blue"}
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framework.Logf("Creating daemon with a node affinity %s", dsName)
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affinity := &v1.Affinity{
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framework.Logf("Creating daemon %q with a node affinity", dsName)
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ds := newDaemonSet(dsName, image, complexLabel)
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ds.Spec.Template.Spec.Affinity = &v1.Affinity{
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NodeAffinity: &v1.NodeAffinity{
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RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
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NodeSelectorTerms: []v1.NodeSelectorTerm{
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@ -225,29 +181,7 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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},
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},
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}
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_, err := c.Extensions().DaemonSets(ns).Create(&extensions.DaemonSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Selector: &metav1.LabelSelector{MatchLabels: complexLabel},
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: complexLabel,
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},
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Spec: v1.PodSpec{
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Affinity: affinity,
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Containers: []v1.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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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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_, err := c.Extensions().DaemonSets(ns).Create(ds)
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Expect(err).NotTo(HaveOccurred())
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By("Initially, daemon pods should not be running on any nodes.")
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@ -271,13 +205,67 @@ var _ = framework.KubeDescribe("Daemon set [Serial]", func() {
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Expect(err).NotTo(HaveOccurred(), "error removing labels on node")
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Expect(wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, complexLabel))).
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NotTo(HaveOccurred(), "error waiting for daemon pod to not be running on nodes")
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})
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By("We should now be able to delete the daemon set.")
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Expect(c.Extensions().DaemonSets(ns).Delete(dsName, nil)).NotTo(HaveOccurred())
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It("should retry creating failed daemon pods", func() {
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label := map[string]string{daemonsetNameLabel: dsName}
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By(fmt.Sprintf("Creating a simple DaemonSet %q", dsName))
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_, err := c.Extensions().DaemonSets(ns).Create(newDaemonSet(dsName, image, label))
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Expect(err).NotTo(HaveOccurred())
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By("Check that daemon pods launch on every node of the cluster.")
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnAllNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to start")
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err = checkDaemonStatus(f, dsName)
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Expect(err).NotTo(HaveOccurred())
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By("Set a daemon pod's phase to 'Failed', check that the daemon pod is revived.")
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podList := listDaemonPods(c, ns, label)
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pod := podList.Items[0]
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pod.ResourceVersion = ""
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pod.Status.Phase = v1.PodFailed
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_, err = c.Core().Pods(ns).UpdateStatus(&pod)
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Expect(err).NotTo(HaveOccurred(), "error failing a daemon pod")
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnAllNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to revive")
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})
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})
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func newDaemonSet(dsName, image string, label map[string]string) *extensions.DaemonSet {
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return &extensions.DaemonSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: label,
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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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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func listDaemonPods(c clientset.Interface, ns string, label map[string]string) *v1.PodList {
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selector := labels.Set(label).AsSelector()
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options := metav1.ListOptions{LabelSelector: selector.String()}
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podList, err := c.Core().Pods(ns).List(options)
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Expect(err).NotTo(HaveOccurred())
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Expect(len(podList.Items)).To(BeNumerically(">", 0))
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return podList
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}
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func separateDaemonSetNodeLabels(labels map[string]string) (map[string]string, map[string]string) {
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daemonSetLabels := map[string]string{}
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otherLabels := map[string]string{}
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@ -354,7 +342,9 @@ func checkDaemonPodOnNodes(f *framework.Framework, selector map[string]string, n
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nodesToPodCount := make(map[string]int)
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for _, pod := range pods {
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nodesToPodCount[pod.Spec.NodeName] += 1
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if controller.IsPodActive(&pod) {
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nodesToPodCount[pod.Spec.NodeName] += 1
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}
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}
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framework.Logf("nodesToPodCount: %#v", nodesToPodCount)
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