Golang framework.WaitForRCPodToDisappear函數代碼示例

// Blocks outgoing network traffic on 'node'. Then verifies that 'podNameToDisappear',
// that belongs to replication controller 'rcName', really disappeared.
// Finally, it checks that the replication controller recreates the
// pods on another node and that now the number of replicas is equal 'replicas'.
// At the end (even in case of errors), the network traffic is brought back to normal.
// This function executes commands on a node so it will work only for some
// environments.
func performTemporaryNetworkFailure(c *client.Client, ns, rcName string, replicas int32, podNameToDisappear string, node *api.Node) {
	host := getNodeExternalIP(node)
	master := getMaster(c)
	By(fmt.Sprintf("block network traffic from node %s to the master", node.Name))
	defer func() {
		// This code will execute even if setting the iptables rule failed.
		// It is on purpose because we may have an error even if the new rule
		// had been inserted. (yes, we could look at the error code and ssh error
		// separately, but I prefer to stay on the safe side).
		By(fmt.Sprintf("Unblock network traffic from node %s to the master", node.Name))
		framework.UnblockNetwork(host, master)
	}()

	framework.Logf("Waiting %v to ensure node %s is ready before beginning test...", resizeNodeReadyTimeout, node.Name)
	if !framework.WaitForNodeToBe(c, node.Name, api.NodeReady, true, resizeNodeReadyTimeout) {
		framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
	}
	framework.BlockNetwork(host, master)

	framework.Logf("Waiting %v for node %s to be not ready after simulated network failure", resizeNodeNotReadyTimeout, node.Name)
	if !framework.WaitForNodeToBe(c, node.Name, api.NodeReady, false, resizeNodeNotReadyTimeout) {
		framework.Failf("Node %s did not become not-ready within %v", node.Name, resizeNodeNotReadyTimeout)
	}

	framework.Logf("Waiting for pod %s to be removed", podNameToDisappear)
	err := framework.WaitForRCPodToDisappear(c, ns, rcName, podNameToDisappear)
	Expect(err).NotTo(HaveOccurred())

	By("verifying whether the pod from the unreachable node is recreated")
	err = framework.VerifyPods(c, ns, rcName, true, replicas)
	Expect(err).NotTo(HaveOccurred())

	// network traffic is unblocked in a deferred function
}

			pods, err := c.Core().Pods(ns).List(options) // list pods after all have been scheduled
			Expect(err).NotTo(HaveOccurred())
			nodeName := pods.Items[0].Spec.NodeName

			node, err := c.Core().Nodes().Get(nodeName)
			Expect(err).NotTo(HaveOccurred())

			// This creates a temporary network partition, verifies that 'podNameToDisappear',
			// that belongs to replication controller 'rcName', really disappeared (because its
			// grace period is set to 0).
			// Finally, it checks that the replication controller recreates the
			// pods on another node and that now the number of replicas is equal 'replicas'.
			By(fmt.Sprintf("blocking network traffic from node %s", node.Name))
			testUnderTemporaryNetworkFailure(c, ns, node, func() {
				framework.Logf("Waiting for pod %s to be removed", pods.Items[0].Name)
				err := framework.WaitForRCPodToDisappear(c, ns, name, pods.Items[0].Name)
				Expect(err).NotTo(HaveOccurred())

				By("verifying whether the pod from the unreachable node is recreated")
				err = framework.VerifyPods(c, ns, name, true, replicas)
				Expect(err).NotTo(HaveOccurred())
			})

			framework.Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
			if !framework.WaitForNodeToBeReady(c, node.Name, resizeNodeReadyTimeout) {
				framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
			}

			// sleep a bit, to allow Watch in NodeController to catch up.
			time.Sleep(5 * time.Second)

				selectorKey, selectorValue = sentinelRC, "true"
				label = labels.SelectorFromSet(labels.Set(map[string]string{selectorKey: selectorValue}))
				err = framework.WaitForPodsWithLabelRunning(c, ns, label)
				Expect(err).NotTo(HaveOccurred())
				forEachPod(selectorKey, selectorValue, func(pod api.Pod) {
					if pod.Name != bootstrapPodName {
						_, err := framework.LookForStringInLog(ns, pod.Name, "sentinel", expectedOnSentinel, serverStartTimeout)
						Expect(err).NotTo(HaveOccurred())
					}
				})
			}
			checkAllLogs()

			By("turning down bootstrap")
			framework.RunKubectlOrDie("delete", "-f", bootstrapYaml, nsFlag)
			err = framework.WaitForRCPodToDisappear(c, ns, redisRC, bootstrapPodName)
			Expect(err).NotTo(HaveOccurred())
			By("waiting for the new master election")
			checkAllLogs()
		})
	})

	framework.KubeDescribe("Spark", func() {
		It("should start spark master, driver and workers", func() {
			mkpath := func(file string) string {
				return filepath.Join(framework.TestContext.RepoRoot, "examples/spark", file)
			}

			// TODO: Add Zepplin and Web UI to this example.
			serviceYaml := mkpath("spark-master-service.yaml")
			masterYaml := mkpath("spark-master-controller.yaml")