// kubeletCommand performs `start`, `restart`, or `stop` on the kubelet running on the node of the target pod.
// Allowed kubeltOps are `kStart`, `kStop`, and `kRestart`
func kubeletCommand(kOp kubeletOpt, c clientset.Interface, pod *v1.Pod) {
nodeIP, err := framework.GetHostExternalAddress(c, pod)
Expect(err).NotTo(HaveOccurred())
nodeIP = nodeIP + ":22"
sshResult, err := framework.SSH("sudo /etc/init.d/kubelet "+string(kOp), nodeIP, framework.TestContext.Provider)
Expect(err).NotTo(HaveOccurred())
framework.LogSSHResult(sshResult)
// On restart, waiting for node NotReady prevents a race condition where the node takes a few moments to leave the
// Ready state which in turn short circuits WaitForNodeToBeReady()
if kOp == kStop || kOp == kRestart {
if ok := framework.WaitForNodeToBeNotReady(c, pod.Spec.NodeName, NodeStateTimeout); !ok {
framework.Failf("Node %s failed to enter NotReady state", pod.Spec.NodeName)
}
}
if kOp == kStart || kOp == kRestart {
if ok := framework.WaitForNodeToBeReady(c, pod.Spec.NodeName, NodeStateTimeout); !ok {
framework.Failf("Node %s failed to enter Ready state", pod.Spec.NodeName)
}
}
}
// rebootNode takes node name on provider through the following steps using c:
// - ensures the node is ready
// - ensures all pods on the node are running and ready
// - reboots the node (by executing rebootCmd over ssh)
// - ensures the node reaches some non-ready state
// - ensures the node becomes ready again
// - ensures all pods on the node become running and ready again
//
// It returns true through result only if all of the steps pass; at the first
// failed step, it will return false through result and not run the rest.
func rebootNode(c *client.Client, provider, name, rebootCmd string) bool {
// Setup
ns := api.NamespaceSystem
ps := framework.NewPodStore(c, ns, labels.Everything(), fields.OneTermEqualSelector(api.PodHostField, name))
defer ps.Stop()
// Get the node initially.
framework.Logf("Getting %s", name)
node, err := c.Nodes().Get(name)
if err != nil {
framework.Logf("Couldn't get node %s", name)
return false
}
// Node sanity check: ensure it is "ready".
if !framework.WaitForNodeToBeReady(c, name, framework.NodeReadyInitialTimeout) {
return false
}
// Get all the pods on the node that don't have liveness probe set.
// Liveness probe may cause restart of a pod during node reboot, and the pod may not be running.
pods := ps.List()
podNames := []string{}
for _, p := range pods {
probe := false
for _, c := range p.Spec.Containers {
if c.LivenessProbe != nil {
probe = true
break
}
}
if !probe {
podNames = append(podNames, p.ObjectMeta.Name)
}
}
framework.Logf("Node %s has %d assigned pods with no liveness probes: %v", name, len(podNames), podNames)
// For each pod, we do a sanity check to ensure it's running / healthy
// or succeeded now, as that's what we'll be checking later.
if !framework.CheckPodsRunningReadyOrSucceeded(c, ns, podNames, framework.PodReadyBeforeTimeout) {
printStatusAndLogsForNotReadyPods(c, ns, podNames, pods)
return false
}
// Reboot the node.
if err = framework.IssueSSHCommand(rebootCmd, provider, node); err != nil {
framework.Logf("Error while issuing ssh command: %v", err)
return false
}
// Wait for some kind of "not ready" status.
if !framework.WaitForNodeToBeNotReady(c, name, rebootNodeNotReadyTimeout) {
return false
}
// Wait for some kind of "ready" status.
if !framework.WaitForNodeToBeReady(c, name, rebootNodeReadyAgainTimeout) {
return false
}
// Ensure all of the pods that we found on this node before the reboot are
// running / healthy, or succeeded.
if !framework.CheckPodsRunningReadyOrSucceeded(c, ns, podNames, rebootPodReadyAgainTimeout) {
newPods := ps.List()
printStatusAndLogsForNotReadyPods(c, ns, podNames, newPods)
return false
}
framework.Logf("Reboot successful on node %s", name)
return true
}