Golang deployment.GetOldReplicaSets函数代码示例

func testDeploymentLabelAdopted(f *Framework) {
	ns := f.Namespace.Name
	// TODO: remove unversionedClient when the refactoring is done. Currently some
	// functions like verifyPod still expects a unversioned#Client.
	unversionedClient := f.Client
	c := clientset.FromUnversionedClient(unversionedClient)
	// Create nginx pods.
	podName := "nginx"
	podLabels := map[string]string{"name": podName}

	rsName := "test-adopted-controller"
	replicas := 3
	_, err := c.Extensions().ReplicaSets(ns).Create(newRS(rsName, replicas, podLabels, podName, podName))
	Expect(err).NotTo(HaveOccurred())
	// Verify that the required pods have come up.
	err = verifyPods(unversionedClient, ns, podName, false, 3)
	if err != nil {
		Logf("error in waiting for pods to come up: %s", err)
		Expect(err).NotTo(HaveOccurred())
	}

	// Create a nginx deployment to adopt the old rs.
	deploymentName := "test-adopted-deployment"
	Logf("Creating deployment %s", deploymentName)
	_, err = c.Extensions().Deployments(ns).Create(newDeployment(deploymentName, replicas, podLabels, podName, podName, extensions.RollingUpdateDeploymentStrategyType, nil))
	Expect(err).NotTo(HaveOccurred())
	defer stopDeployment(c, f.Client, ns, deploymentName)

	// Wait for it to be updated to revision 1
	err = waitForDeploymentRevisionAndImage(c, ns, deploymentName, "1", "nginx")
	Expect(err).NotTo(HaveOccurred())

	// The RS and pods should be relabeled before the status is updated by syncRollingUpdateDeployment
	err = waitForDeploymentStatus(c, ns, deploymentName, replicas, replicas-1, replicas+1, 0)
	Expect(err).NotTo(HaveOccurred())

	// There should be no old RSs (overlapping RS)
	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())
	oldRSs, allOldRSs, err := deploymentutil.GetOldReplicaSets(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	Expect(len(oldRSs)).Should(Equal(0))
	Expect(len(allOldRSs)).Should(Equal(0))
	// New RS should contain pod-template-hash in its selector, label, and template label
	newRS, err := deploymentutil.GetNewReplicaSet(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	Expect(len(newRS.Labels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	Expect(len(newRS.Spec.Selector.MatchLabels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	Expect(len(newRS.Spec.Template.Labels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	// All pods targeted by the deployment should contain pod-template-hash in their labels, and there should be only 3 pods
	selector, err := unversioned.LabelSelectorAsSelector(deployment.Spec.Selector)
	Expect(err).NotTo(HaveOccurred())
	options := api.ListOptions{LabelSelector: selector}
	pods, err := c.Core().Pods(ns).List(options)
	Expect(err).NotTo(HaveOccurred())
	for _, pod := range pods.Items {
		Expect(len(pod.Labels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	}
	Expect(len(pods.Items)).Should(Equal(replicas))
}

// History returns a revision-to-replicaset map as the revision history of a deployment
func (h *DeploymentHistoryViewer) History(namespace, name string) (HistoryInfo, error) {
	historyInfo := HistoryInfo{
		RevisionToTemplate: make(map[int64]*api.PodTemplateSpec),
	}
	deployment, err := h.c.Extensions().Deployments(namespace).Get(name)
	if err != nil {
		return historyInfo, fmt.Errorf("failed to retrieve deployment %s: %v", name, err)
	}
	_, allOldRSs, err := deploymentutil.GetOldReplicaSets(*deployment, h.c)
	if err != nil {
		return historyInfo, fmt.Errorf("failed to retrieve old replica sets from deployment %s: %v", name, err)
	}
	newRS, err := deploymentutil.GetNewReplicaSet(*deployment, h.c)
	if err != nil {
		return historyInfo, fmt.Errorf("failed to retrieve new replica set from deployment %s: %v", name, err)
	}
	allRSs := append(allOldRSs, newRS)
	for _, rs := range allRSs {
		v, err := deploymentutil.Revision(rs)
		if err != nil {
			continue
		}
		historyInfo.RevisionToTemplate[v] = rs.Spec.Template
		changeCause := getChangeCause(rs)
		if historyInfo.RevisionToTemplate[v].Annotations == nil {
			historyInfo.RevisionToTemplate[v].Annotations = make(map[string]string)
		}
		historyInfo.RevisionToTemplate[v].Annotations[ChangeCauseAnnotation] = changeCause
	}
	return historyInfo, nil
}

func testRollingUpdateDeployment(f *Framework) {
	ns := f.Namespace.Name
	// TODO: remove unversionedClient when the refactoring is done. Currently some
	// functions like verifyPod still expects a unversioned#Client.
	unversionedClient := f.Client
	c := clientset.FromUnversionedClient(unversionedClient)
	// Create nginx pods.
	deploymentPodLabels := map[string]string{"name": "sample-pod"}
	rsPodLabels := map[string]string{
		"name": "sample-pod",
		"pod":  nginxImageName,
	}

	rsName := "test-rolling-update-controller"
	replicas := 3
	_, err := c.Extensions().ReplicaSets(ns).Create(newRS(rsName, replicas, rsPodLabels, nginxImageName, nginxImage))
	Expect(err).NotTo(HaveOccurred())
	// Verify that the required pods have come up.
	err = verifyPods(unversionedClient, ns, "sample-pod", false, 3)
	if err != nil {
		Logf("error in waiting for pods to come up: %s", err)
		Expect(err).NotTo(HaveOccurred())
	}

	// Create a deployment to delete nginx pods and instead bring up redis pods.
	deploymentName := "test-rolling-update-deployment"
	Logf("Creating deployment %s", deploymentName)
	_, err = c.Extensions().Deployments(ns).Create(newDeployment(deploymentName, replicas, deploymentPodLabels, redisImageName, redisImage, extensions.RollingUpdateDeploymentStrategyType, nil))
	Expect(err).NotTo(HaveOccurred())
	defer stopDeployment(c, f.Client, ns, deploymentName)

	// Wait for it to be updated to revision 1
	err = waitForDeploymentRevisionAndImage(c, ns, deploymentName, "1", redisImage)
	Expect(err).NotTo(HaveOccurred())

	err = waitForDeploymentStatus(c, ns, deploymentName, replicas, replicas-1, replicas+1, 0)
	Expect(err).NotTo(HaveOccurred())

	// There should be 1 old RS (nginx-controller, which is adopted)
	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())
	_, allOldRSs, err := deploymentutil.GetOldReplicaSets(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	Expect(len(allOldRSs)).Should(Equal(1))
	// The old RS should contain pod-template-hash in its selector, label, and template label
	Expect(len(allOldRSs[0].Labels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	Expect(len(allOldRSs[0].Spec.Selector.MatchLabels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
	Expect(len(allOldRSs[0].Spec.Template.Labels[extensions.DefaultDeploymentUniqueLabelKey])).Should(BeNumerically(">", 0))
}

func testPausedDeployment(f *framework.Framework) {
	ns := f.Namespace.Name
	// TODO: remove unversionedClient when the refactoring is done. Currently some
	// functions like verifyPod still expects a unversioned#Client.
	unversionedClient := f.Client
	c := adapter.FromUnversionedClient(unversionedClient)
	deploymentName := "test-paused-deployment"
	podLabels := map[string]string{"name": nginxImageName}
	d := newDeployment(deploymentName, 1, podLabels, nginxImageName, nginxImage, extensions.RollingUpdateDeploymentStrategyType, nil)
	d.Spec.Paused = true
	tgps := int64(20)
	d.Spec.Template.Spec.TerminationGracePeriodSeconds = &tgps
	framework.Logf("Creating paused deployment %s", deploymentName)
	_, err := c.Extensions().Deployments(ns).Create(d)
	Expect(err).NotTo(HaveOccurred())
	defer stopDeployment(c, f.Client, ns, deploymentName)
	// Check that deployment is created fine.
	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())

	// Verify that there is no latest state realized for the new deployment.
	rs, err := deploymentutil.GetNewReplicaSet(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	if rs != nil {
		err = fmt.Errorf("unexpected new rs/%s for deployment/%s", rs.Name, deployment.Name)
		Expect(err).NotTo(HaveOccurred())
	}

	// Update the deployment to run
	deployment, err = framework.UpdateDeploymentWithRetries(c, ns, d.Name, func(update *extensions.Deployment) {
		update.Spec.Paused = false
	})
	Expect(err).NotTo(HaveOccurred())

	// Use observedGeneration to determine if the controller noticed the resume.
	err = framework.WaitForObservedDeployment(c, ns, deploymentName, deployment.Generation)
	Expect(err).NotTo(HaveOccurred())

	selector, err := unversioned.LabelSelectorAsSelector(deployment.Spec.Selector)
	if err != nil {
		Expect(err).NotTo(HaveOccurred())
	}
	opts := api.ListOptions{LabelSelector: selector}
	w, err := c.Extensions().ReplicaSets(ns).Watch(opts)
	Expect(err).NotTo(HaveOccurred())

	select {
	case <-w.ResultChan():
		// this is it
	case <-time.After(time.Minute):
		err = fmt.Errorf("expected a new replica set to be created")
		Expect(err).NotTo(HaveOccurred())
	}

	// Pause the deployment and delete the replica set.
	// The paused deployment shouldn't recreate a new one.
	deployment, err = framework.UpdateDeploymentWithRetries(c, ns, d.Name, func(update *extensions.Deployment) {
		update.Spec.Paused = true
	})
	Expect(err).NotTo(HaveOccurred())

	// Use observedGeneration to determine if the controller noticed the pause.
	err = framework.WaitForObservedDeployment(c, ns, deploymentName, deployment.Generation)
	Expect(err).NotTo(HaveOccurred())

	// Update the deployment template - the new replicaset should stay the same
	framework.Logf("Updating paused deployment %q", deploymentName)
	newTGPS := int64(40)
	deployment, err = framework.UpdateDeploymentWithRetries(c, ns, d.Name, func(update *extensions.Deployment) {
		update.Spec.Template.Spec.TerminationGracePeriodSeconds = &newTGPS
	})
	Expect(err).NotTo(HaveOccurred())

	err = framework.WaitForObservedDeployment(c, ns, deploymentName, deployment.Generation)
	Expect(err).NotTo(HaveOccurred())

	framework.Logf("Looking for new replicaset for paused deployment %q (there should be none)", deploymentName)
	newRS, err := deploymentutil.GetNewReplicaSet(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	if newRS != nil {
		err = fmt.Errorf("No replica set should match the deployment template but there is %q", newRS.Name)
		Expect(err).NotTo(HaveOccurred())
	}

	_, allOldRs, err := deploymentutil.GetOldReplicaSets(deployment, c)
	Expect(err).NotTo(HaveOccurred())
	if len(allOldRs) != 1 {
		err = fmt.Errorf("expected an old replica set")
		Expect(err).NotTo(HaveOccurred())
	}
	framework.Logf("Comparing deployment diff with old replica set %q", allOldRs[0].Name)
	if *allOldRs[0].Spec.Template.Spec.TerminationGracePeriodSeconds == newTGPS {
		err = fmt.Errorf("TerminationGracePeriodSeconds on the replica set should be %d but is %d", tgps, newTGPS)
		Expect(err).NotTo(HaveOccurred())
	}
}

// ViewHistory prints the revision history of a deployment
func (h *DeploymentHistoryViewer) ViewHistory(namespace, name string, revision int64) (string, error) {
	deployment, err := h.c.Extensions().Deployments(namespace).Get(name)
	if err != nil {
		return "", fmt.Errorf("failed to retrieve deployment %s: %v", name, err)
	}
	_, allOldRSs, err := deploymentutil.GetOldReplicaSets(deployment, h.c)
	if err != nil {
		return "", fmt.Errorf("failed to retrieve old replica sets from deployment %s: %v", name, err)
	}
	newRS, err := deploymentutil.GetNewReplicaSet(deployment, h.c)
	if err != nil {
		return "", fmt.Errorf("failed to retrieve new replica set from deployment %s: %v", name, err)
	}

	historyInfo := make(map[int64]*api.PodTemplateSpec)
	for _, rs := range append(allOldRSs, newRS) {
		v, err := deploymentutil.Revision(rs)
		if err != nil {
			continue
		}
		historyInfo[v] = &rs.Spec.Template
		changeCause := getChangeCause(rs)
		if historyInfo[v].Annotations == nil {
			historyInfo[v].Annotations = make(map[string]string)
		}
		if len(changeCause) > 0 {
			historyInfo[v].Annotations[ChangeCauseAnnotation] = changeCause
		}
	}

	if len(historyInfo) == 0 {
		return "No rollout history found.", nil
	}

	if revision > 0 {
		// Print details of a specific revision
		template, ok := historyInfo[revision]
		if !ok {
			return "", fmt.Errorf("unable to find the specified revision")
		}
		buf := bytes.NewBuffer([]byte{})
		DescribePodTemplate(template, buf)
		return buf.String(), nil
	}

	// Sort the revisionToChangeCause map by revision
	var revisions []string
	for k := range historyInfo {
		revisions = append(revisions, strconv.FormatInt(k, 10))
	}
	sort.Strings(revisions)

	return tabbedString(func(out io.Writer) error {
		fmt.Fprintf(out, "REVISION\tCHANGE-CAUSE\n")
		errs := []error{}
		for _, r := range revisions {
			// Find the change-cause of revision r
			r64, err := strconv.ParseInt(r, 10, 64)
			if err != nil {
				errs = append(errs, err)
				continue
			}
			changeCause := historyInfo[r64].Annotations[ChangeCauseAnnotation]
			if len(changeCause) == 0 {
				changeCause = "<none>"
			}
			fmt.Fprintf(out, "%s\t%s\n", r, changeCause)
		}
		return errors.NewAggregate(errs)
	})
}

// testRollbackDeploymentRSNoRevision tests that deployment supports rollback even when there's old replica set without revision.
// An old replica set without revision is created, and then a deployment is created (v1). The deployment shouldn't add revision
// annotation to the old replica set. Then rollback the deployment to last revision, and it should fail and emit related event.
// Then update the deployment to v2 and rollback it to v1 should succeed and emit related event, now the deployment
// becomes v3. Then rollback the deployment to v10 (doesn't exist in history) should fail and emit related event.
// Finally, rollback the deployment (v3) to v3 should be no-op and emit related event.
func testRollbackDeploymentRSNoRevision(f *Framework) {
	ns := f.Namespace.Name
	unversionedClient := f.Client
	c := clientset.FromUnversionedClient(f.Client)
	podName := "nginx"
	deploymentPodLabels := map[string]string{"name": podName}
	rsPodLabels := map[string]string{
		"name": podName,
		"pod":  "nginx",
	}

	rsName := "nginx-controller"
	rsReplicas := 0
	rs := newRS(rsName, rsReplicas, rsPodLabels, "nginx", "nginx")
	rs.Annotations = make(map[string]string)
	rs.Annotations["make"] = "difference"
	_, err := c.Extensions().ReplicaSets(ns).Create(rs)
	Expect(err).NotTo(HaveOccurred())
	defer func() {
		Logf("deleting replica set %s", rsName)
		Expect(c.Extensions().ReplicaSets(ns).Delete(rsName, nil)).NotTo(HaveOccurred())
	}()

	// Create a deployment to create nginx pods, which have different template than the replica set created above.
	deploymentName, deploymentImageName := "nginx-deployment", "nginx"
	deploymentReplicas := 1
	deploymentImage := "nginx"
	deploymentStrategyType := extensions.RollingUpdateDeploymentStrategyType
	Logf("Creating deployment %s", deploymentName)
	d := newDeployment(deploymentName, deploymentReplicas, deploymentPodLabels, deploymentImageName, deploymentImage, deploymentStrategyType, nil)
	_, err = c.Extensions().Deployments(ns).Create(d)
	Expect(err).NotTo(HaveOccurred())
	defer func() {
		deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
		Expect(err).NotTo(HaveOccurred())
		Logf("deleting deployment %s", deploymentName)
		Expect(c.Extensions().Deployments(ns).Delete(deploymentName, nil)).NotTo(HaveOccurred())
		// TODO: remove this once we can delete replica sets with deployment
		newRS, err := deploymentutil.GetNewReplicaSet(*deployment, c)
		Expect(err).NotTo(HaveOccurred())
		Expect(c.Extensions().ReplicaSets(ns).Delete(newRS.Name, nil)).NotTo(HaveOccurred())
		oldRSs, _, err := deploymentutil.GetOldReplicaSets(*deployment, c)
		Expect(err).NotTo(HaveOccurred())
		for _, oldRS := range oldRSs {
			Expect(c.Extensions().ReplicaSets(ns).Delete(oldRS.Name, nil)).NotTo(HaveOccurred())
		}
	}()
	// Check that deployment is created fine.
	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())

	// Verify that the required pods have come up.
	err = verifyPods(unversionedClient, ns, "nginx", false, deploymentReplicas)
	if err != nil {
		Logf("error in waiting for pods to come up: %s", err)
		Expect(err).NotTo(HaveOccurred())
	}
	deployment, err = c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())
	// DeploymentStatus should be appropriately updated.
	Expect(deployment.Status.Replicas).Should(Equal(deploymentReplicas))
	Expect(deployment.Status.UpdatedReplicas).Should(Equal(deploymentReplicas))

	// Check if it's updated to revision 1 correctly
	checkDeploymentRevision(c, ns, deploymentName, "1", deploymentImageName, deploymentImage)

	// Check that the replica set we created still doesn't contain revision information
	rs, err = c.Extensions().ReplicaSets(ns).Get(rsName)
	Expect(rs.Annotations[deploymentutil.RevisionAnnotation]).Should(Equal(""))

	// Update the deploymentRollback to rollback to last revision
	// Since there's only 1 revision in history, it should stay as revision 1
	revision := int64(0)
	Logf("rolling back deployment %s to last revision", deploymentName)
	rollback := newDeploymentRollback(deploymentName, nil, revision)
	err = c.Extensions().Deployments(ns).Rollback(rollback)
	Expect(err).NotTo(HaveOccurred())

	// There should be revision not found event since there's no last revision
	waitForEvents(unversionedClient, ns, deployment, 2)
	events, err := c.Events(ns).Search(deployment)
	Expect(err).NotTo(HaveOccurred())
	Expect(events.Items[1].Reason).Should(Equal(deploymentutil.RollbackRevisionNotFound))

	// Check if it's still revision 1
	checkDeploymentRevision(c, ns, deploymentName, "1", deploymentImageName, deploymentImage)

	// Update the deployment to create redis pods.
	updatedDeploymentImage := "redis"
	updatedDeploymentImageName := "redis"
	d.Spec.Template.Spec.Containers[0].Name = updatedDeploymentImageName
	d.Spec.Template.Spec.Containers[0].Image = updatedDeploymentImage
	Logf("updating deployment %s", deploymentName)
	_, err = c.Extensions().Deployments(ns).Update(d)
//.........这里部分代码省略.........

// testRollbackDeployment tests that a deployment is created (revision 1) and updated (revision 2), and
// then rollback to revision 1 (should update template to revision 1, and then update revision 1 to 3),
// and then rollback to last revision.
func testRollbackDeployment(f *Framework) {
	ns := f.Namespace.Name
	unversionedClient := f.Client
	c := clientset.FromUnversionedClient(unversionedClient)
	podName := "nginx"
	deploymentPodLabels := map[string]string{"name": podName}

	// Create a deployment to create nginx pods.
	deploymentName, deploymentImageName := "nginx-deployment", "nginx"
	deploymentReplicas := 1
	deploymentImage := "nginx"
	deploymentStrategyType := extensions.RollingUpdateDeploymentStrategyType
	Logf("Creating deployment %s", deploymentName)
	d := newDeployment(deploymentName, deploymentReplicas, deploymentPodLabels, deploymentImageName, deploymentImage, deploymentStrategyType, nil)
	_, err := c.Extensions().Deployments(ns).Create(d)
	Expect(err).NotTo(HaveOccurred())
	defer func() {
		deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
		Expect(err).NotTo(HaveOccurred())
		Logf("deleting deployment %s", deploymentName)
		Expect(c.Extensions().Deployments(ns).Delete(deploymentName, nil)).NotTo(HaveOccurred())
		// TODO: remove this once we can delete replica sets with deployment
		newRS, err := deploymentutil.GetNewReplicaSet(*deployment, c)
		Expect(err).NotTo(HaveOccurred())
		Expect(c.Extensions().ReplicaSets(ns).Delete(newRS.Name, nil)).NotTo(HaveOccurred())
		oldRSs, _, err := deploymentutil.GetOldReplicaSets(*deployment, c)
		Expect(err).NotTo(HaveOccurred())
		for _, oldRS := range oldRSs {
			Expect(c.Extensions().ReplicaSets(ns).Delete(oldRS.Name, nil)).NotTo(HaveOccurred())
		}
	}()
	// Check that deployment is created fine.
	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())

	// Verify that the required pods have come up.
	err = verifyPods(unversionedClient, ns, "nginx", false, deploymentReplicas)
	if err != nil {
		Logf("error in waiting for pods to come up: %s", err)
		Expect(err).NotTo(HaveOccurred())
	}
	deployment, err = c.Extensions().Deployments(ns).Get(deploymentName)
	Expect(err).NotTo(HaveOccurred())
	// DeploymentStatus should be appropriately updated.
	Expect(deployment.Status.Replicas).Should(Equal(deploymentReplicas))
	Expect(deployment.Status.UpdatedReplicas).Should(Equal(deploymentReplicas))

	// Check if it's updated to revision 1 correctly
	checkDeploymentRevision(c, ns, deploymentName, "1", deploymentImageName, deploymentImage)

	// Update the deployment to create redis pods.
	updatedDeploymentImage := "redis"
	updatedDeploymentImageName := "redis"
	d.Spec.Template.Spec.Containers[0].Name = updatedDeploymentImageName
	d.Spec.Template.Spec.Containers[0].Image = updatedDeploymentImage
	Logf("updating deployment %s", deploymentName)
	_, err = c.Extensions().Deployments(ns).Update(d)
	Expect(err).NotTo(HaveOccurred())

	err = waitForDeploymentStatus(c, ns, deploymentName, deploymentReplicas, deploymentReplicas-1, deploymentReplicas+1, 0)
	Expect(err).NotTo(HaveOccurred())

	// Check if it's updated to revision 2 correctly
	checkDeploymentRevision(c, ns, deploymentName, "2", updatedDeploymentImageName, updatedDeploymentImage)

	// Update the deploymentRollback to rollback to revision 1
	revision := int64(1)
	Logf("rolling back deployment %s to revision %d", deploymentName, revision)
	rollback := newDeploymentRollback(deploymentName, nil, revision)
	err = c.Extensions().Deployments(ns).Rollback(rollback)
	Expect(err).NotTo(HaveOccurred())

	err = waitForDeploymentStatus(c, ns, deploymentName, deploymentReplicas, deploymentReplicas-1, deploymentReplicas+1, 0)
	Expect(err).NotTo(HaveOccurred())

	// Check if it's updated to revision 3 correctly
	checkDeploymentRevision(c, ns, deploymentName, "3", deploymentImageName, deploymentImage)

	// Update the deploymentRollback to rollback to last revision
	revision = 0
	Logf("rolling back deployment %s to last revision", deploymentName)
	rollback = newDeploymentRollback(deploymentName, nil, revision)
	err = c.Extensions().Deployments(ns).Rollback(rollback)
	Expect(err).NotTo(HaveOccurred())

	err = waitForDeploymentStatus(c, ns, deploymentName, deploymentReplicas, deploymentReplicas-1, deploymentReplicas+1, 0)
	Expect(err).NotTo(HaveOccurred())

	// Check if it's updated to revision 4 correctly
	checkDeploymentRevision(c, ns, deploymentName, "4", updatedDeploymentImageName, updatedDeploymentImage)
}