// executeExecNewPod executes a ExecNewPod hook by creating a new pod based on
// the hook parameters and deployment. The pod is then synchronously watched
// until the pod completes, and if the pod failed, an error is returned.
//
// The hook pod inherits the following from the container the hook refers to:
//
//   * Environment (hook keys take precedence)
//   * Working directory
//   * Resources
func (e *HookExecutor) executeExecNewPod(hook *deployapi.LifecycleHook, deployment *kapi.ReplicationController, label string) error {
	// Build a pod spec from the hook config and deployment
	podSpec, err := makeHookPod(hook, deployment, label)
	if err != nil {
		return err
	}

	// Try to create the pod.
	pod, err := e.PodClient.CreatePod(deployment.Namespace, podSpec)
	if err != nil {
		if !kerrors.IsAlreadyExists(err) {
			return fmt.Errorf("couldn't create lifecycle pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}
	} else {
		glog.V(0).Infof("Created lifecycle pod %s for deployment %s", pod.Name, deployutil.LabelForDeployment(deployment))
	}

	stopChannel := make(chan struct{})
	defer close(stopChannel)
	nextPod := e.PodClient.PodWatch(pod.Namespace, pod.Name, pod.ResourceVersion, stopChannel)

	glog.V(0).Infof("Waiting for hook pod %s/%s to complete", pod.Namespace, pod.Name)
	for {
		pod := nextPod()
		switch pod.Status.Phase {
		case kapi.PodSucceeded:
			return nil
		case kapi.PodFailed:
			return fmt.Errorf(pod.Status.Message)
		}
	}
}

func (c *DeploymentController) cancelDeployerPods(deployment *kapi.ReplicationController) error {
	deployerPods, err := c.podClient.getDeployerPodsFor(deployment.Namespace, deployment.Name)
	if err != nil {
		return fmt.Errorf("couldn't fetch deployer pods for %s while trying to cancel deployment: %v", deployutil.LabelForDeployment(deployment), err)
	}
	glog.V(4).Infof("Cancelling %d deployer pods for deployment %s", len(deployerPods), deployutil.LabelForDeployment(deployment))
	zeroDelay := int64(1)
	anyCancelled := false
	for _, deployerPod := range deployerPods {
		// Set the ActiveDeadlineSeconds on the pod so it's terminated very soon.
		if deployerPod.Spec.ActiveDeadlineSeconds == nil || *deployerPod.Spec.ActiveDeadlineSeconds != zeroDelay {
			deployerPod.Spec.ActiveDeadlineSeconds = &zeroDelay
			if _, err := c.podClient.updatePod(deployerPod.Namespace, &deployerPod); err != nil {
				if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
					c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedCancellation", "Error cancelling deployer pod %s for deployment %s: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err)
				} else {
					c.recorder.Eventf(deployment, kapi.EventTypeWarning, "FailedCancellation", "Error cancelling deployer pod %s for deployment %s: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err)
				}
				return fmt.Errorf("couldn't cancel deployer pod %s for deployment %s: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err)
			}
			anyCancelled = true
			glog.V(4).Infof("Cancelled deployer pod %s for deployment %s", deployerPod.Name, deployutil.LabelForDeployment(deployment))
		}
	}
	if anyCancelled {
		if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil && len(deployerPods) > 0 {
			c.recorder.Eventf(config, kapi.EventTypeNormal, "Cancelled", "Cancelled deployer pods for deployment %s", deployutil.LabelForDeployment(deployment))
		} else if len(deployerPods) > 0 {
			c.recorder.Eventf(deployment, kapi.EventTypeNormal, "Cancelled", "Cancelled deployer pods")
		}
	}
	return nil
}

// Accept implements UpdateAcceptor.
func (c *AcceptNewlyObservedReadyPods) Accept(deployment *kapi.ReplicationController) error {
	// Make a pod store to poll and ensure it gets cleaned up.
	podStore, stopStore := c.getDeploymentPodStore(deployment)
	defer close(stopStore)

	// Start checking for pod updates.
	glog.V(0).Infof("Waiting %.f seconds for pods owned by deployment %q to become ready (checking every %.f seconds; %d pods previously accepted)", c.timeout.Seconds(), deployutil.LabelForDeployment(deployment), c.interval.Seconds(), c.acceptedPods.Len())
	err := wait.Poll(c.interval, c.timeout, func() (done bool, err error) {
		// Check for pod readiness.
		unready := kutil.NewStringSet()
		for _, obj := range podStore.List() {
			pod := obj.(*kapi.Pod)
			// Skip previously accepted pods; we only want to verify newly observed
			// and unaccepted pods.
			if c.acceptedPods.Has(pod.Name) {
				continue
			}
			if kapi.IsPodReady(pod) {
				// If the pod is ready, track it as accepted.
				c.acceptedPods.Insert(pod.Name)
			} else {
				// Otherwise, track it as unready.
				unready.Insert(pod.Name)
			}
		}
		// Check to see if we're done.
		if unready.Len() == 0 {
			glog.V(0).Infof("All pods ready for %s", deployutil.LabelForDeployment(deployment))
			return true, nil
		}
		// Otherwise, try again later.
		glog.V(4).Infof("Still waiting for %d pods to become ready for deployment %s", unready.Len(), deployutil.LabelForDeployment(deployment))
		return false, nil
	})

	// Handle acceptance failure.
	if err != nil {
		if err == wait.ErrWaitTimeout {
			return fmt.Errorf("pods for deployment %q took longer than %.f seconds to become ready", deployutil.LabelForDeployment(deployment), c.timeout.Seconds())
		}
		return fmt.Errorf("pod readiness check failed for deployment %q: %v", deployutil.LabelForDeployment(deployment), err)
	}
	return nil
}

// executeExecNewPod executes a ExecNewPod hook by creating a new pod based on
// the hook parameters and deployment. The pod is then synchronously watched
// until the pod completes, and if the pod failed, an error is returned.
//
// The hook pod inherits the following from the container the hook refers to:
//
//   * Environment (hook keys take precedence)
//   * Working directory
//   * Resources
func (e *HookExecutor) executeExecNewPod(hook *deployapi.LifecycleHook, deployment *kapi.ReplicationController, label string) error {
	config, err := deployutil.DecodeDeploymentConfig(deployment, e.codec)
	if err != nil {
		return err
	}

	// Build a pod spec from the hook config and deployment
	podSpec, err := makeHookPod(hook, deployment, &config.Template.Strategy, label)
	if err != nil {
		return err
	}

	// Try to create the pod.
	pod, err := e.podClient.CreatePod(deployment.Namespace, podSpec)
	if err != nil {
		if !kerrors.IsAlreadyExists(err) {
			return fmt.Errorf("couldn't create lifecycle pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}
	} else {
		glog.V(0).Infof("Created lifecycle pod %s/%s for deployment %s", pod.Namespace, pod.Name, deployutil.LabelForDeployment(deployment))
	}

	stopChannel := make(chan struct{})
	defer close(stopChannel)
	nextPod := e.podClient.PodWatch(pod.Namespace, pod.Name, pod.ResourceVersion, stopChannel)

	// Wait for the hook pod to reach a terminal phase. Start reading logs as
	// soon as the pod enters a usable phase.
	var updatedPod *kapi.Pod
	var once sync.Once
	wg := &sync.WaitGroup{}
	wg.Add(1)
	glog.V(0).Infof("Watching logs for hook pod %s/%s while awaiting completion", pod.Namespace, pod.Name)
waitLoop:
	for {
		updatedPod = nextPod()
		switch updatedPod.Status.Phase {
		case kapi.PodRunning:
			go once.Do(func() { e.readPodLogs(pod, wg) })
		case kapi.PodSucceeded, kapi.PodFailed:
			go once.Do(func() { e.readPodLogs(pod, wg) })
			break waitLoop
		}
	}
	// The pod is finished, wait for all logs to be consumed before returning.
	wg.Wait()
	if updatedPod.Status.Phase == kapi.PodFailed {
		return fmt.Errorf(updatedPod.Status.Message)
	}
	return nil
}

func (c *DeploymentController) cancelDeployerPods(deployment *kapi.ReplicationController) error {
	deployerPods, err := c.podClient.getDeployerPodsFor(deployment.Namespace, deployment.Name)
	if err != nil {
		return fmt.Errorf("couldn't fetch deployer pods for %s while trying to cancel deployment: %v", deployutil.LabelForDeployment(deployment), err)
	}
	glog.V(4).Infof("Cancelling %d deployer pods for deployment %s", len(deployerPods), deployutil.LabelForDeployment(deployment))
	zeroDelay := int64(1)
	cleanedAll := len(deployerPods) > 0
	for _, deployerPod := range deployerPods {
		// Set the ActiveDeadlineSeconds on the pod so it's terminated very soon.
		if deployerPod.Spec.ActiveDeadlineSeconds == nil || *deployerPod.Spec.ActiveDeadlineSeconds != zeroDelay {
			deployerPod.Spec.ActiveDeadlineSeconds = &zeroDelay
			if _, err := c.podClient.updatePod(deployerPod.Namespace, &deployerPod); err != nil {
				cleanedAll = false
				utilruntime.HandleError(fmt.Errorf("couldn't cancel deployer pod %s for deployment %s: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err))
			}
			glog.V(4).Infof("Cancelled deployer pod %s for deployment %s", deployerPod.Name, deployutil.LabelForDeployment(deployment))
		}
	}
	if cleanedAll {
		c.emitDeploymentEvent(deployment, kapi.EventTypeNormal, "Cancelled", "Cancelled all deployer pods")
	}
	return nil
}

func (c *DeploymentTriggerController) updateDeploymentConfig(old, cur interface{}) {
	newDc := cur.(*deployapi.DeploymentConfig)
	oldDc := old.(*deployapi.DeploymentConfig)

	// A periodic relist will send update events for all known deployment configs.
	if newDc.ResourceVersion == oldDc.ResourceVersion {
		return
	}
	// No need to enqueue deployment configs that have no triggers or are paused.
	if len(newDc.Spec.Triggers) == 0 || newDc.Spec.Paused {
		return
	}
	// We don't want to compete with the main deployment config controller. Let's process this
	// config once it's synced. Note that this does not eliminate conflicts between the two
	// controllers because the main controller is constantly updating deployment configs as
	// owning replication controllers and pods are updated.
	if !deployutil.HasSynced(newDc, newDc.Generation) {
		return
	}
	// Enqueue the deployment config if it hasn't been deployed yet.
	if newDc.Status.LatestVersion == 0 {
		c.enqueueDeploymentConfig(newDc)
		return
	}
	// Compare deployment config templates before enqueueing. This reduces the amount of times
	// we will try to instantiate a deployment config at the expense of duplicating some of the
	// work that the instantiate endpoint is already doing but I think this is fine.
	shouldInstantiate := true
	latestRc, err := c.rcLister.ReplicationControllers(newDc.Namespace).Get(deployutil.LatestDeploymentNameForConfig(newDc))
	if err != nil {
		// If we get an error here it may be due to the rc cache lagging behind. In such a case
		// just defer to the api server (instantiate REST) where we will retry this.
		glog.V(2).Infof("Cannot get latest rc for dc %s:%d (%v) - will defer to instantiate", deployutil.LabelForDeploymentConfig(newDc), newDc.Status.LatestVersion, err)
	} else {
		initial, err := deployutil.DecodeDeploymentConfig(latestRc, c.codec)
		if err != nil {
			glog.V(2).Infof("Cannot decode dc from replication controller %s: %v", deployutil.LabelForDeployment(latestRc), err)
			return
		}
		shouldInstantiate = !reflect.DeepEqual(newDc.Spec.Template, initial.Spec.Template)
	}
	if !shouldInstantiate {
		return
	}

	c.enqueueDeploymentConfig(newDc)
}

func (c *DeploymentController) cleanupDeployerPods(deployment *kapi.ReplicationController) error {
	deployerPods, err := c.podClient.getDeployerPodsFor(deployment.Namespace, deployment.Name)
	if err != nil {
		return fmt.Errorf("couldn't fetch deployer pods for %q: %v", deployutil.LabelForDeployment(deployment), err)
	}

	cleanedAll := true
	for _, deployerPod := range deployerPods {
		if err := c.podClient.deletePod(deployerPod.Namespace, deployerPod.Name); err != nil && !kerrors.IsNotFound(err) {
			// if the pod deletion failed, then log the error and continue
			// we will try to delete any remaining deployer pods and return an error later
			utilruntime.HandleError(fmt.Errorf("couldn't delete completed deployer pod %q for deployment %q: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err))
			cleanedAll = false
		}
	}

	if !cleanedAll {
		return actionableError(fmt.Sprintf("couldn't clean up all deployer pods for %s", deployment.Name))
	}
	return nil
}

func (c *DeploymentController) cleanupDeployerPods(deployment *kapi.ReplicationController) error {
	selector := deployutil.DeployerPodSelector(deployment.Name)
	deployerList, err := c.podStore.Pods(deployment.Namespace).List(selector)
	if err != nil {
		return fmt.Errorf("couldn't fetch deployer pods for %q: %v", deployutil.LabelForDeployment(deployment), err)
	}

	cleanedAll := true
	gracePeriod := int64(10)
	for _, deployerPod := range deployerList.Items {
		if err := c.pn.Pods(deployerPod.Namespace).Delete(deployerPod.Name, &kapi.DeleteOptions{GracePeriodSeconds: &gracePeriod}); err != nil && !kerrors.IsNotFound(err) {
			// if the pod deletion failed, then log the error and continue
			// we will try to delete any remaining deployer pods and return an error later
			utilruntime.HandleError(fmt.Errorf("couldn't delete completed deployer pod %q for deployment %q: %v", deployerPod.Name, deployutil.LabelForDeployment(deployment), err))
			cleanedAll = false
		}
	}

	if !cleanedAll {
		return actionableError(fmt.Sprintf("couldn't clean up all deployer pods for %s", deployment.Name))
	}
	return nil
}

// Handle processes deployment and either creates a deployer pod or responds
// to a terminal deployment status. Since this controller started using caches,
// the provided rc MUST be deep-copied beforehand (see work() in factory.go).
func (c *DeploymentController) Handle(deployment *kapi.ReplicationController) error {
	currentStatus := deployutil.DeploymentStatusFor(deployment)
	nextStatus := currentStatus
	deploymentScaled := false

	deployerPodName := deployutil.DeployerPodNameForDeployment(deployment.Name)
	deployer, deployerErr := c.getPod(deployment.Namespace, deployerPodName)

	switch currentStatus {
	case deployapi.DeploymentStatusNew:
		// If the deployment has been cancelled, don't create a deployer pod.
		// Instead try to delete any deployer pods found and transition the
		// deployment to Pending so that the deployment config controller
		// continues to see the deployment as in-flight. Eventually the deletion
		// of the deployer pod should cause a requeue of this deployment and
		// then it can be transitioned to Failed by this controller.
		if deployutil.IsDeploymentCancelled(deployment) {
			nextStatus = deployapi.DeploymentStatusPending
			if err := c.cleanupDeployerPods(deployment); err != nil {
				return err
			}
			break
		}

		// If the pod already exists, it's possible that a previous CreatePod
		// succeeded but the deployment state update failed and now we're re-
		// entering. Ensure that the pod is the one we created by verifying the
		// annotation on it, and throw a retryable error.
		if deployerErr != nil && !kerrors.IsNotFound(deployerErr) {
			return fmt.Errorf("couldn't fetch existing deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), deployerErr)
		}
		if deployerErr == nil && deployer != nil {
			// Do a stronger check to validate that the existing deployer pod is
			// actually for this deployment, and if not, fail this deployment.
			//
			// TODO: Investigate checking the container image of the running pod and
			// comparing with the intended deployer pod image. If we do so, we'll need
			// to ensure that changes to 'unrelated' pods don't result in updates to
			// the deployment. So, the image check will have to be done in other areas
			// of the code as well.
			if deployutil.DeploymentNameFor(deployer) != deployment.Name {
				nextStatus = deployapi.DeploymentStatusFailed
				deployment.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedUnrelatedDeploymentExists
				c.emitDeploymentEvent(deployment, kapi.EventTypeWarning, "FailedCreate", fmt.Sprintf("Error creating deployer pod since another pod with the same name (%q) exists", deployer.Name))
				glog.V(2).Infof("Couldn't create deployer pod for %s since an unrelated pod with the same name (%q) exists", deployutil.LabelForDeployment(deployment), deployer.Name)
			} else {
				// Update to pending relative to the existing validated deployer pod.
				deployment.Annotations[deployapi.DeploymentPodAnnotation] = deployer.Name
				nextStatus = deployapi.DeploymentStatusPending
				glog.V(4).Infof("Detected existing deployer pod %s for deployment %s", deployer.Name, deployutil.LabelForDeployment(deployment))
			}
			// Don't try and re-create the deployer pod.
			break
		}

		if _, ok := deployment.Annotations[deployapi.DeploymentIgnorePodAnnotation]; ok {
			return nil
		}

		// Generate a deployer pod spec.
		deployerPod, err := c.makeDeployerPod(deployment)
		if err != nil {
			return fatalError(fmt.Sprintf("couldn't make deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err))
		}
		// Create the deployer pod.
		deploymentPod, err := c.pn.Pods(deployment.Namespace).Create(deployerPod)
		// Retry on error.
		if err != nil {
			return actionableError(fmt.Sprintf("couldn't create deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err))
		}
		deployment.Annotations[deployapi.DeploymentPodAnnotation] = deploymentPod.Name
		nextStatus = deployapi.DeploymentStatusPending
		glog.V(4).Infof("Created deployer pod %s for deployment %s", deploymentPod.Name, deployutil.LabelForDeployment(deployment))

	case deployapi.DeploymentStatusPending, deployapi.DeploymentStatusRunning:
		switch {
		case kerrors.IsNotFound(deployerErr):
			nextStatus = deployapi.DeploymentStatusFailed
			// If the deployment is cancelled here then we deleted the deployer in a previous
			// resync of the deployment.
			if !deployutil.IsDeploymentCancelled(deployment) {
				deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus)
				deployment.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedDeployerPodNoLongerExists
				c.emitDeploymentEvent(deployment, kapi.EventTypeWarning, "Failed", fmt.Sprintf("Deployer pod %q has gone missing", deployerPodName))
				glog.V(4).Infof("Failing deployment %q because its deployer pod %q disappeared", deployutil.LabelForDeployment(deployment), deployerPodName)
			}

		case deployerErr != nil:
			// We'll try again later on resync. Continue to process cancellations.
			glog.V(4).Infof("Error getting deployer pod %s for deployment %s: %v", deployerPodName, deployutil.LabelForDeployment(deployment), deployerErr)

		default: /* err == nil */
			// If the deployment has been cancelled, delete any deployer pods
			// found and transition the deployment to Pending so that the
			// deployment config controller continues to see the deployment
			// as in-flight. Eventually the deletion of the deployer pod should
			// cause a requeue of this deployment and then it can be transitioned
//.........这里部分代码省略.........

// Handle processes change triggers for config.
func (c *DeploymentConfigChangeController) Handle(config *deployapi.DeploymentConfig) error {
	hasChangeTrigger := false
	for _, trigger := range config.Triggers {
		if trigger.Type == deployapi.DeploymentTriggerOnConfigChange {
			hasChangeTrigger = true
			break
		}
	}

	if !hasChangeTrigger {
		glog.V(4).Infof("Ignoring DeploymentConfig %s; no change triggers detected", deployutil.LabelForDeploymentConfig(config))
		return nil
	}

	if config.LatestVersion == 0 {
		_, _, err := c.generateDeployment(config)
		if err != nil {
			if kerrors.IsConflict(err) {
				return fatalError(fmt.Sprintf("DeploymentConfig %s updated since retrieval; aborting trigger: %v", deployutil.LabelForDeploymentConfig(config), err))
			}
			// TODO: This needs handled by setting some state within the API so
			// users know why the trigger isn't doing anything.
			// https://github.com/openshift/origin/issues/3526
			return nil
		}
		glog.V(4).Infof("Created initial Deployment for DeploymentConfig %s", deployutil.LabelForDeploymentConfig(config))
		return nil
	}

	latestDeploymentName := deployutil.LatestDeploymentNameForConfig(config)
	deployment, err := c.changeStrategy.getDeployment(config.Namespace, latestDeploymentName)
	if err != nil {
		// If there's no deployment for the latest config, we have no basis of
		// comparison. It's the responsibility of the deployment config controller
		// to make the deployment for the config, so return early.
		if kerrors.IsNotFound(err) {
			glog.V(2).Infof("Ignoring change for DeploymentConfig %s; no existing Deployment found", deployutil.LabelForDeploymentConfig(config))
			return nil
		}
		return fmt.Errorf("couldn't retrieve Deployment for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err)
	}

	deployedConfig, err := c.decodeConfig(deployment)
	if err != nil {
		return fatalError(fmt.Sprintf("error decoding DeploymentConfig from Deployment %s for DeploymentConfig %s: %v", deployutil.LabelForDeployment(deployment), deployutil.LabelForDeploymentConfig(config), err))
	}

	newSpec, oldSpec := config.Template.ControllerTemplate.Template.Spec, deployedConfig.Template.ControllerTemplate.Template.Spec
	if kapi.Semantic.DeepEqual(oldSpec, newSpec) {
		glog.V(2).Infof("Ignoring DeploymentConfig change for %s (latestVersion=%d); same as Deployment %s", deployutil.LabelForDeploymentConfig(config), config.LatestVersion, deployutil.LabelForDeployment(deployment))
		return nil
	}

	fromVersion, toVersion, err := c.generateDeployment(config)
	if err != nil {
		if kerrors.IsConflict(err) {
			return fatalError(fmt.Sprintf("DeploymentConfig %s updated since retrieval; aborting trigger: %v", deployutil.LabelForDeploymentConfig(config), err))
		}
		return fmt.Errorf("couldn't generate deployment for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err)
	}
	glog.V(4).Infof("Updated DeploymentConfig %s from version %d to %d for existing deployment %s", deployutil.LabelForDeploymentConfig(config), fromVersion, toVersion, deployutil.LabelForDeployment(deployment))
	return nil
}

// reconcileDeployments reconciles existing deployment replica counts which
// could have diverged outside the deployment process (e.g. due to auto or
// manual scaling, or partial deployments). The active deployment is the last
// successful deployment, not necessarily the latest in terms of the config
// version. The active deployment replica count should follow the config, and
// all other deployments should be scaled to zero.
//
// Previously, scaling behavior was that the config replica count was used
// only for initial deployments and the active deployment had to be scaled up
// directly. To continue supporting that old behavior we must detect when the
// deployment has been directly manipulated, and if so, preserve the directly
// updated value and sync the config with the deployment.
func (c *DeploymentConfigController) reconcileDeployments(existingDeployments []kapi.ReplicationController, config *deployapi.DeploymentConfig) error {
	latestIsDeployed, latestDeployment := deployutil.LatestDeploymentInfo(config, existingDeployments)
	if !latestIsDeployed {
		// We shouldn't be reconciling if the latest deployment hasn't been
		// created; this is enforced on the calling side, but double checking
		// can't hurt.
		return c.updateStatus(config, existingDeployments)
	}
	activeDeployment := deployutil.ActiveDeployment(existingDeployments)
	// Compute the replica count for the active deployment (even if the active
	// deployment doesn't exist). The active replica count is the value that
	// should be assigned to the config, to allow the replica propagation to
	// flow downward from the config.
	//
	// By default we'll assume the config replicas should be used to update the
	// active deployment except in special cases (like first sync or externally
	// updated deployments.)
	activeReplicas := config.Spec.Replicas
	source := "the deploymentConfig itself (no change)"

	activeDeploymentExists := activeDeployment != nil
	activeDeploymentIsLatest := activeDeploymentExists && activeDeployment.Name == latestDeployment.Name
	latestDesiredReplicas, latestHasDesiredReplicas := deployutil.DeploymentDesiredReplicas(latestDeployment)

	switch {
	case activeDeploymentExists && activeDeploymentIsLatest:
		// The active/latest deployment follows the config unless this is its first
		// sync or if an external change to the deployment replicas is detected.
		lastActiveReplicas, hasLastActiveReplicas := deployutil.DeploymentReplicas(activeDeployment)
		if !hasLastActiveReplicas || lastActiveReplicas != activeDeployment.Spec.Replicas {
			activeReplicas = activeDeployment.Spec.Replicas
			source = fmt.Sprintf("the latest/active deployment %q which was scaled directly or has not previously been synced", deployutil.LabelForDeployment(activeDeployment))
		}
	case activeDeploymentExists && !activeDeploymentIsLatest:
		// The active/non-latest deployment follows the config if it was
		// previously synced; if this is the first sync, infer what the config
		// value should be based on either the latest desired or whatever the
		// deployment is currently scaled to.
		_, hasLastActiveReplicas := deployutil.DeploymentReplicas(activeDeployment)
		if hasLastActiveReplicas {
			break
		}
		if latestHasDesiredReplicas {
			activeReplicas = latestDesiredReplicas
			source = fmt.Sprintf("the desired replicas of latest deployment %q which has not been previously synced", deployutil.LabelForDeployment(latestDeployment))
		} else if activeDeployment.Spec.Replicas > 0 {
			activeReplicas = activeDeployment.Spec.Replicas
			source = fmt.Sprintf("the active deployment %q which has not been previously synced", deployutil.LabelForDeployment(activeDeployment))
		}
	case !activeDeploymentExists && latestHasDesiredReplicas:
		// If there's no active deployment, use the latest desired, if available.
		activeReplicas = latestDesiredReplicas
		source = fmt.Sprintf("the desired replicas of latest deployment %q with no active deployment", deployutil.LabelForDeployment(latestDeployment))
	}

	// Bring the config in sync with the deployment. Once we know the config
	// accurately represents the desired replica count of the active deployment,
	// we can safely reconcile deployments.
	//
	// If the deployment config is test, never update the deployment config based
	// on deployments, since test behavior overrides user scaling.
	switch {
	case config.Spec.Replicas == activeReplicas:
	case config.Spec.Test:
		glog.V(4).Infof("Detected changed replicas for test deploymentConfig %q, ignoring that change", deployutil.LabelForDeploymentConfig(config))
	default:
		copied, err := deployutil.DeploymentConfigDeepCopy(config)
		if err != nil {
			return err
		}
		oldReplicas := copied.Spec.Replicas
		copied.Spec.Replicas = activeReplicas
		config, err = c.dn.DeploymentConfigs(copied.Namespace).Update(copied)
		if err != nil {
			return err
		}
		glog.V(4).Infof("Synced deploymentConfig %q replicas from %d to %d based on %s", deployutil.LabelForDeploymentConfig(config), oldReplicas, activeReplicas, source)
	}

	// Reconcile deployments. The active deployment follows the config, and all
	// other deployments should be scaled to zero.
	var updatedDeployments []kapi.ReplicationController
	for i := range existingDeployments {
		deployment := existingDeployments[i]
		toAppend := deployment

		isActiveDeployment := activeDeployment != nil && deployment.Name == activeDeployment.Name

//.........这里部分代码省略.........

// Get returns a streamer resource with the contents of the deployment log
func (r *REST) Get(ctx kapi.Context, name string, opts runtime.Object) (runtime.Object, error) {
	// Ensure we have a namespace in the context
	namespace, ok := kapi.NamespaceFrom(ctx)
	if !ok {
		return nil, errors.NewBadRequest("namespace parameter required.")
	}

	// Validate DeploymentLogOptions
	deployLogOpts, ok := opts.(*deployapi.DeploymentLogOptions)
	if !ok {
		return nil, errors.NewBadRequest("did not get an expected options.")
	}
	if errs := validation.ValidateDeploymentLogOptions(deployLogOpts); len(errs) > 0 {
		return nil, errors.NewInvalid("deploymentLogOptions", "", errs)
	}

	// Fetch deploymentConfig and check latest version; if 0, there are no deployments
	// for this config
	config, err := r.ConfigGetter.DeploymentConfigs(namespace).Get(name)
	if err != nil {
		return nil, errors.NewNotFound("deploymentConfig", name)
	}
	desiredVersion := config.Status.LatestVersion
	if desiredVersion == 0 {
		return nil, errors.NewBadRequest(fmt.Sprintf("no deployment exists for deploymentConfig %q", config.Name))
	}

	// Support retrieving logs for older deployments
	switch {
	case deployLogOpts.Version == nil:
		// Latest
	case *deployLogOpts.Version <= 0 || int(*deployLogOpts.Version) > config.Status.LatestVersion:
		// Invalid version
		return nil, errors.NewBadRequest(fmt.Sprintf("invalid version for deploymentConfig %q: %d", config.Name, *deployLogOpts.Version))
	default:
		desiredVersion = int(*deployLogOpts.Version)
	}

	// Get desired deployment
	targetName := deployutil.DeploymentNameForConfigVersion(config.Name, desiredVersion)
	target, err := r.DeploymentGetter.ReplicationControllers(namespace).Get(targetName)
	if err != nil {
		return nil, err
	}

	// Check for deployment status; if it is new or pending, we will wait for it. If it is complete,
	// the deployment completed successfully and the deployer pod will be deleted so we will return a
	// success message. If it is running or failed, retrieve the log from the deployer pod.
	status := deployutil.DeploymentStatusFor(target)
	switch status {
	case deployapi.DeploymentStatusNew, deployapi.DeploymentStatusPending:
		if deployLogOpts.NoWait {
			glog.V(4).Infof("Deployment %s is in %s state. No logs to retrieve yet.", deployutil.LabelForDeployment(target), status)
			return &genericrest.LocationStreamer{}, nil
		}
		glog.V(4).Infof("Deployment %s is in %s state, waiting for it to start...", deployutil.LabelForDeployment(target), status)

		latest, ok, err := registry.WaitForRunningDeployment(r.DeploymentGetter, target, r.Timeout)
		if err != nil {
			return nil, errors.NewBadRequest(fmt.Sprintf("unable to wait for deployment %s to run: %v", deployutil.LabelForDeployment(target), err))
		}
		if !ok {
			return nil, errors.NewTimeoutError(fmt.Sprintf("timed out waiting for deployment %s to start after %s", deployutil.LabelForDeployment(target), r.Timeout), 1)
		}
		if deployutil.DeploymentStatusFor(latest) == deployapi.DeploymentStatusComplete {
			// Deployer pod has been deleted, no logs to retrieve
			glog.V(4).Infof("Deployment %s was successful so the deployer pod is deleted. No logs to retrieve.", deployutil.LabelForDeployment(target))
			return &genericrest.LocationStreamer{}, nil
		}
	case deployapi.DeploymentStatusComplete:
		// Deployer pod has been deleted, no logs to retrieve
		glog.V(4).Infof("Deployment %s was successful so the deployer pod is deleted. No logs to retrieve.", deployutil.LabelForDeployment(target))
		return &genericrest.LocationStreamer{}, nil
	}

	// Setup url of the deployer pod
	deployPodName := deployutil.DeployerPodNameForDeployment(target.Name)
	logOpts := deployapi.DeploymentToPodLogOptions(deployLogOpts)
	location, transport, err := pod.LogLocation(r.PodGetter, r.ConnectionInfo, ctx, deployPodName, logOpts)
	if err != nil {
		return nil, errors.NewBadRequest(err.Error())
	}

	return &genericrest.LocationStreamer{
		Location:        location,
		Transport:       transport,
		ContentType:     "text/plain",
		Flush:           deployLogOpts.Follow,
		ResponseChecker: genericrest.NewGenericHttpResponseChecker("Pod", deployPodName),
	}, nil
}

func (s *RollingDeploymentStrategy) Deploy(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int) error {
	config, err := deployutil.DecodeDeploymentConfig(to, s.codec)
	if err != nil {
		return fmt.Errorf("couldn't decode DeploymentConfig from deployment %s: %v", deployutil.LabelForDeployment(to), err)
	}

	params := config.Template.Strategy.RollingParams
	updateAcceptor := s.getUpdateAcceptor(time.Duration(*params.TimeoutSeconds) * time.Second)

	// If there's no prior deployment, delegate to another strategy since the
	// rolling updater only supports transitioning between two deployments.
	//
	// Hook support is duplicated here for now. When the rolling updater can
	// handle initial deployments, all of this code can go away.
	if from == nil {
		// Execute any pre-hook.
		if params.Pre != nil {
			err := s.hookExecutor.Execute(params.Pre, to, "prehook")
			if err != nil {
				return fmt.Errorf("Pre hook failed: %s", err)
			}
			glog.Infof("Pre hook finished")
		}

		// Execute the delegate strategy.
		err := s.initialStrategy.DeployWithAcceptor(from, to, desiredReplicas, updateAcceptor)
		if err != nil {
			return err
		}

		// Execute any post-hook. Errors are logged and ignored.
		if params.Post != nil {
			err := s.hookExecutor.Execute(params.Post, to, "posthook")
			if err != nil {
				util.HandleError(fmt.Errorf("post hook failed: %s", err))
			} else {
				glog.Infof("Post hook finished")
			}
		}

		// All done.
		return nil
	}

	// Prepare for a rolling update.
	// Execute any pre-hook.
	if params.Pre != nil {
		err := s.hookExecutor.Execute(params.Pre, to, "prehook")
		if err != nil {
			return fmt.Errorf("pre hook failed: %s", err)
		}
		glog.Infof("Pre hook finished")
	}

	// HACK: Assign the source ID annotation that the rolling updater expects,
	// unless it already exists on the deployment.
	//
	// Related upstream issue:
	// https://github.com/kubernetes/kubernetes/pull/7183
	err = wait.Poll(s.apiRetryPeriod, s.apiRetryTimeout, func() (done bool, err error) {
		existing, err := s.client.ReplicationControllers(to.Namespace).Get(to.Name)
		if err != nil {
			msg := fmt.Sprintf("couldn't look up deployment %s: %s", deployutil.LabelForDeployment(to), err)
			if kerrors.IsNotFound(err) {
				return false, fmt.Errorf("%s", msg)
			}
			// Try again.
			glog.Infof(msg)
			return false, nil
		}
		if _, hasSourceId := existing.Annotations[sourceIdAnnotation]; !hasSourceId {
			existing.Annotations[sourceIdAnnotation] = fmt.Sprintf("%s:%s", from.Name, from.ObjectMeta.UID)
			if _, err := s.client.ReplicationControllers(existing.Namespace).Update(existing); err != nil {
				msg := fmt.Sprintf("couldn't assign source annotation to deployment %s: %v", deployutil.LabelForDeployment(existing), err)
				if kerrors.IsNotFound(err) {
					return false, fmt.Errorf("%s", msg)
				}
				// Try again.
				glog.Infof(msg)
				return false, nil
			}
		}
		return true, nil
	})
	if err != nil {
		return err
	}
	to, err = s.client.ReplicationControllers(to.Namespace).Get(to.Name)
	if err != nil {
		return err
	}

	// HACK: There's a validation in the rolling updater which assumes that when
	// an existing RC is supplied, it will have >0 replicas- a validation which
	// is then disregarded as the desired count is obtained from the annotation
	// on the RC. For now, fake it out by just setting replicas to 1.
	//
	// Related upstream issue:
	// https://github.com/kubernetes/kubernetes/pull/7183
	to.Spec.Replicas = 1
//.........这里部分代码省略.........

// Handle processes deployment and either creates a deployer pod or responds
// to a terminal deployment status.
func (c *DeploymentController) Handle(deployment *kapi.ReplicationController) error {
	currentStatus := deployutil.DeploymentStatusFor(deployment)
	nextStatus := currentStatus
	deploymentScaled := false

	switch currentStatus {
	case deployapi.DeploymentStatusNew:
		// If the deployment has been cancelled, don't create a deployer pod, and
		// transition to failed immediately.
		if deployutil.IsDeploymentCancelled(deployment) {
			nextStatus = deployapi.DeploymentStatusFailed
			break
		}

		// Generate a deployer pod spec.
		podTemplate, err := c.makeDeployerPod(deployment)
		if err != nil {
			return fatalError(fmt.Sprintf("couldn't make deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err))
		}

		// Create the deployer pod.
		deploymentPod, err := c.podClient.createPod(deployment.Namespace, podTemplate)
		if err == nil {
			deployment.Annotations[deployapi.DeploymentPodAnnotation] = deploymentPod.Name
			nextStatus = deployapi.DeploymentStatusPending
			glog.V(4).Infof("Created pod %s for deployment %s", deploymentPod.Name, deployutil.LabelForDeployment(deployment))
			break
		}

		// Retry on error.
		if !kerrors.IsAlreadyExists(err) {
			c.recorder.Eventf(deployment, kapi.EventTypeWarning, "FailedCreate", "Error creating deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
			return fmt.Errorf("couldn't create deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}

		// If the pod already exists, it's possible that a previous CreatePod
		// succeeded but the deployment state update failed and now we're re-
		// entering. Ensure that the pod is the one we created by verifying the
		// annotation on it, and throw a retryable error.
		existingPod, err := c.podClient.getPod(deployment.Namespace, deployutil.DeployerPodNameForDeployment(deployment.Name))
		if err != nil {
			c.recorder.Eventf(deployment, kapi.EventTypeWarning, "FailedCreate", "Error getting existing deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
			return fmt.Errorf("couldn't fetch existing deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}

		// Do a stronger check to validate that the existing deployer pod is
		// actually for this deployment, and if not, fail this deployment.
		//
		// TODO: Investigate checking the container image of the running pod and
		// comparing with the intended deployer pod image. If we do so, we'll need
		// to ensure that changes to 'unrelated' pods don't result in updates to
		// the deployment. So, the image check will have to be done in other areas
		// of the code as well.
		if deployutil.DeploymentNameFor(existingPod) != deployment.Name {
			nextStatus = deployapi.DeploymentStatusFailed
			deployment.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedUnrelatedDeploymentExists
			c.recorder.Eventf(deployment, kapi.EventTypeWarning, "FailedCreate", "Error creating deployer pod for %s since another pod with the same name (%q) exists", deployutil.LabelForDeployment(deployment), existingPod.Name)
			glog.V(2).Infof("Couldn't create deployer pod for %s since an unrelated pod with the same name (%q) exists", deployutil.LabelForDeployment(deployment), existingPod.Name)
			break
		}

		// Update to pending relative to the existing validated deployer pod.
		deployment.Annotations[deployapi.DeploymentPodAnnotation] = existingPod.Name
		nextStatus = deployapi.DeploymentStatusPending
		glog.V(4).Infof("Detected existing deployer pod %s for deployment %s", existingPod.Name, deployutil.LabelForDeployment(deployment))
	case deployapi.DeploymentStatusPending, deployapi.DeploymentStatusRunning:
		// If the deployer pod has vanished, consider the deployment a failure.
		deployerPodName := deployutil.DeployerPodNameForDeployment(deployment.Name)
		if _, err := c.podClient.getPod(deployment.Namespace, deployerPodName); err != nil {
			if kerrors.IsNotFound(err) {
				nextStatus = deployapi.DeploymentStatusFailed
				deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus)
				deployment.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedDeployerPodNoLongerExists
				c.recorder.Eventf(deployment, kapi.EventTypeWarning, "failed", "Deployer pod %q has gone missing", deployerPodName)
				glog.V(4).Infof("Failing deployment %q because its deployer pod %q disappeared", deployutil.LabelForDeployment(deployment), deployerPodName)
				break
			} else {
				// We'll try again later on resync. Continue to process cancellations.
				glog.V(2).Infof("Error getting deployer pod %s for deployment %s: %#v", deployerPodName, deployutil.LabelForDeployment(deployment), err)
			}
		}

		// If the deployment is cancelled, terminate any deployer/hook pods.
		// NOTE: Do not mark the deployment as Failed just yet.
		// The deployment will be marked as Failed by the deployer pod controller
		// when the deployer pod failure state is picked up
		// Also, it will scale down the failed deployment and scale back up
		// the last successful completed deployment
		if deployutil.IsDeploymentCancelled(deployment) {
			deployerPods, err := c.podClient.getDeployerPodsFor(deployment.Namespace, deployment.Name)
			if err != nil {
				return fmt.Errorf("couldn't fetch deployer pods for %s while trying to cancel deployment: %v", deployutil.LabelForDeployment(deployment), err)
			}
			glog.V(4).Infof("Cancelling %d deployer pods for deployment %s", len(deployerPods), deployutil.LabelForDeployment(deployment))
			zeroDelay := int64(1)
			for _, deployerPod := range deployerPods {
				// Set the ActiveDeadlineSeconds on the pod so it's terminated very soon.
				if deployerPod.Spec.ActiveDeadlineSeconds == nil || *deployerPod.Spec.ActiveDeadlineSeconds != zeroDelay {
//.........这里部分代码省略.........

// DeployWithAcceptor scales down from and then scales up to. If
// updateAcceptor is provided and the desired replica count is >1, the first
// replica of to is rolled out and validated before performing the full scale
// up.
//
// This is currently only used in conjunction with the rolling update strategy
// for initial deployments.
func (s *RecreateDeploymentStrategy) DeployWithAcceptor(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int, updateAcceptor strat.UpdateAcceptor) error {
	config, err := deployutil.DecodeDeploymentConfig(to, s.codec)
	if err != nil {
		return fmt.Errorf("couldn't decode config from deployment %s: %v", to.Name, err)
	}

	params := config.Spec.Strategy.RecreateParams
	retryParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout)
	waitParams := kubectl.NewRetryParams(s.retryPeriod, s.r