Golang framework.WaitForPodNotPending函数代码示例

func runLivenessTest(f *framework.Framework, pod *v1.Pod, expectNumRestarts int, timeout time.Duration) {
	podClient := f.PodClient()
	ns := f.Namespace.Name
	Expect(pod.Spec.Containers).NotTo(BeEmpty())
	containerName := pod.Spec.Containers[0].Name
	// At the end of the test, clean up by removing the pod.
	defer func() {
		By("deleting the pod")
		podClient.Delete(pod.Name, v1.NewDeleteOptions(0))
	}()
	By(fmt.Sprintf("Creating pod %s in namespace %s", pod.Name, ns))
	podClient.Create(pod)

	// Wait until the pod is not pending. (Here we need to check for something other than
	// 'Pending' other than checking for 'Running', since when failures occur, we go to
	// 'Terminated' which can cause indefinite blocking.)
	framework.ExpectNoError(framework.WaitForPodNotPending(f.ClientSet, ns, pod.Name, pod.ResourceVersion),
		fmt.Sprintf("starting pod %s in namespace %s", pod.Name, ns))
	framework.Logf("Started pod %s in namespace %s", pod.Name, ns)

	// Check the pod's current state and verify that restartCount is present.
	By("checking the pod's current state and verifying that restartCount is present")
	pod, err := podClient.Get(pod.Name, metav1.GetOptions{})
	framework.ExpectNoError(err, fmt.Sprintf("getting pod %s in namespace %s", pod.Name, ns))
	initialRestartCount := v1.GetExistingContainerStatus(pod.Status.ContainerStatuses, containerName).RestartCount
	framework.Logf("Initial restart count of pod %s is %d", pod.Name, initialRestartCount)

	// Wait for the restart state to be as desired.
	deadline := time.Now().Add(timeout)
	lastRestartCount := initialRestartCount
	observedRestarts := int32(0)
	for start := time.Now(); time.Now().Before(deadline); time.Sleep(2 * time.Second) {
		pod, err = podClient.Get(pod.Name, metav1.GetOptions{})
		framework.ExpectNoError(err, fmt.Sprintf("getting pod %s", pod.Name))
		restartCount := v1.GetExistingContainerStatus(pod.Status.ContainerStatuses, containerName).RestartCount
		if restartCount != lastRestartCount {
			framework.Logf("Restart count of pod %s/%s is now %d (%v elapsed)",
				ns, pod.Name, restartCount, time.Since(start))
			if restartCount < lastRestartCount {
				framework.Failf("Restart count should increment monotonically: restart cont of pod %s/%s changed from %d to %d",
					ns, pod.Name, lastRestartCount, restartCount)
			}
		}
		observedRestarts = restartCount - initialRestartCount
		if expectNumRestarts > 0 && int(observedRestarts) >= expectNumRestarts {
			// Stop if we have observed more than expectNumRestarts restarts.
			break
		}
		lastRestartCount = restartCount
	}

	// If we expected 0 restarts, fail if observed any restart.
	// If we expected n restarts (n > 0), fail if we observed < n restarts.
	if (expectNumRestarts == 0 && observedRestarts > 0) || (expectNumRestarts > 0 &&
		int(observedRestarts) < expectNumRestarts) {
		framework.Failf("pod %s/%s - expected number of restarts: %d, found restarts: %d",
			ns, pod.Name, expectNumRestarts, observedRestarts)
	}
}

		By("Trying to relaunch the pod, now with labels.")
		labelPodName := "with-labels"
		pod := createPausePod(f, pausePodConfig{
			Name: labelPodName,
			NodeSelector: map[string]string{
				"kubernetes.io/hostname": nodeName,
				k: v,
			},
		})

		// check that pod got scheduled. We intentionally DO NOT check that the
		// pod is running because this will create a race condition with the
		// kubelet and the scheduler: the scheduler might have scheduled a pod
		// already when the kubelet does not know about its new label yet. The
		// kubelet will then refuse to launch the pod.
		framework.ExpectNoError(framework.WaitForPodNotPending(c, ns, labelPodName, pod.ResourceVersion))
		labelPod, err := c.Pods(ns).Get(labelPodName)
		framework.ExpectNoError(err)
		Expect(labelPod.Spec.NodeName).To(Equal(nodeName))
	})

	// Test Nodes does not have any label, hence it should be impossible to schedule Pod with
	// non-nil NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.
	It("validates that NodeAffinity is respected if not matching", func() {
		By("Trying to schedule Pod with nonempty NodeSelector.")
		podName := "restricted-pod"

		framework.WaitForStableCluster(c, masterNodes)

		createPausePod(f, pausePodConfig{
			Name: podName,

				},
				NodeSelector: map[string]string{
					"kubernetes.io/hostname": nodeName,
					k: v,
				},
			},
		})
		framework.ExpectNoError(err)
		defer c.Pods(ns).Delete(labelPodName, api.NewDeleteOptions(0))

		// check that pod got scheduled. We intentionally DO NOT check that the
		// pod is running because this will create a race condition with the
		// kubelet and the scheduler: the scheduler might have scheduled a pod
		// already when the kubelet does not know about its new label yet. The
		// kubelet will then refuse to launch the pod.
		framework.ExpectNoError(framework.WaitForPodNotPending(c, ns, labelPodName))
		labelPod, err := c.Pods(ns).Get(labelPodName)
		framework.ExpectNoError(err)
		Expect(labelPod.Spec.NodeName).To(Equal(nodeName))
	})

	// Test Nodes does not have any label, hence it should be impossible to schedule Pod with
	// non-nil NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.
	It("validates that NodeAffinity is respected if not matching", func() {
		By("Trying to schedule Pod with nonempty NodeSelector.")
		podName := "restricted-pod"

		waitForStableCluster(c)

		_, err := c.Pods(ns).Create(&api.Pod{
			TypeMeta: unversioned.TypeMeta{

		queryDns := fmt.Sprintf(queryDnsPythonTemplate, backendSvcName+"."+namespaces[0].Name)
		_, err = framework.LookForStringInPodExec(namespaces[0].Name, podName, []string{"python", "-c", queryDns}, "ok", dnsReadyTimeout)
		Expect(err).NotTo(HaveOccurred(), "waiting for output from pod exec")

		updatedPodYaml := prepareResourceWithReplacedString(frontendPodYaml, "dns-backend.development.cluster.local", fmt.Sprintf("dns-backend.%s.svc.cluster.local", namespaces[0].Name))

		// create a pod in each namespace
		for _, ns := range namespaces {
			framework.NewKubectlCommand("create", "-f", "-", getNsCmdFlag(ns)).WithStdinData(updatedPodYaml).ExecOrDie()
		}

		// wait until the pods have been scheduler, i.e. are not Pending anymore. Remember
		// that we cannot wait for the pods to be running because our pods terminate by themselves.
		for _, ns := range namespaces {
			err := framework.WaitForPodNotPending(c, ns.Name, frontendPodName)
			framework.ExpectNoError(err)
		}

		// wait for pods to print their result
		for _, ns := range namespaces {
			_, err := framework.LookForStringInLog(ns.Name, frontendPodName, frontendPodContainerName, podOutput, framework.PodStartTimeout)
			Expect(err).NotTo(HaveOccurred())
		}
	})
})

func getNsCmdFlag(ns *api.Namespace) string {
	return fmt.Sprintf("--namespace=%v", ns.Name)
}