Exemplo n.º 1
0
// 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
			// to Failed by this controller.
			if deployutil.IsDeploymentCancelled(deployment) {
				if err := c.cleanupDeployerPods(deployment); err != nil {
					return err
				}
			}
		}

	case deployapi.DeploymentStatusFailed:
		// Check for test deployment and ensure the deployment scale matches
		if config, err := deployutil.DecodeDeploymentConfig(deployment, c.codec); err == nil && config.Spec.Test {
			deploymentScaled = deployment.Spec.Replicas != 0
			deployment.Spec.Replicas = 0
		}
		// Try to cleanup once more a cancelled deployment in case hook pods
		// were created just after we issued the first cleanup request.
		if deployutil.IsDeploymentCancelled(deployment) {
			if err := c.cleanupDeployerPods(deployment); err != nil {
				return err
			}
		}

	case deployapi.DeploymentStatusComplete:
		// Check for test deployment and ensure the deployment scale matches
		if config, err := deployutil.DecodeDeploymentConfig(deployment, c.codec); err == nil && config.Spec.Test {
			deploymentScaled = deployment.Spec.Replicas != 0
			deployment.Spec.Replicas = 0
		}

		if err := c.cleanupDeployerPods(deployment); err != nil {
			return err
		}
	}

	if deployutil.CanTransitionPhase(currentStatus, nextStatus) || deploymentScaled {
		deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus)
		if _, err := c.rn.ReplicationControllers(deployment.Namespace).Update(deployment); err != nil {
			return fmt.Errorf("couldn't update deployment %s to status %s: %v", deployutil.LabelForDeployment(deployment), nextStatus, err)
		}
		glog.V(4).Infof("Updated deployment %s status from %s to %s (scale: %d)", deployutil.LabelForDeployment(deployment), currentStatus, nextStatus, deployment.Spec.Replicas)
	}
	return nil
}
Exemplo n.º 2
0
// 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.
		// Transition the deployment to Pending so that re-syncs will check
		// up on the deployer pods and so that the deployment config controller
		// continues to see the deployment as in-flight (which it is until we
		// have deployer pod outcomes).
		if deployutil.IsDeploymentCancelled(deployment) {
			nextStatus = deployapi.DeploymentStatusPending
			if err := c.cancelDeployerPods(deployment); err != nil {
				return err
			}
			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) {
			if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
				c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedCreate", "Error creating deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
			} else {
				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 {
			if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
				c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedCreate", "Error getting existing deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
			} else {
				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
			if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
				c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedCreate", "Error creating deployer pod for %s since another pod with the same name (%q) exists", deployutil.LabelForDeployment(deployment), existingPod.Name)
			} else {
				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
				if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
					c.recorder.Eventf(config, kapi.EventTypeWarning, "Failed", "Deployer pod %q has gone missing", deployerPodName)
				} else {
					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.
		// Then, the deployment config controller will scale down the failed deployment
		// and scale back up the last successful completed deployment.
		if deployutil.IsDeploymentCancelled(deployment) {
			if err := c.cancelDeployerPods(deployment); err != nil {
				return err
			}
		}
	case deployapi.DeploymentStatusFailed:
		// Check for test deployment and ensure the deployment scale matches
		if config, err := c.decodeConfig(deployment); err == nil && config.Spec.Test {
			deploymentScaled = deployment.Spec.Replicas != 0
			deployment.Spec.Replicas = 0
		}
	case deployapi.DeploymentStatusComplete:
		// Check for test deployment and ensure the deployment scale matches
		if config, err := c.decodeConfig(deployment); err == nil && config.Spec.Test {
			deploymentScaled = deployment.Spec.Replicas != 0
			deployment.Spec.Replicas = 0
		}

		// now list any pods in the namespace that have the specified label
		deployerPods, err := c.podClient.getDeployerPodsFor(deployment.Namespace, deployment.Name)
		if err != nil {
			return fmt.Errorf("couldn't fetch deployer pods for %s after successful completion: %v", deployutil.LabelForDeployment(deployment), err)
		}
		if len(deployerPods) > 0 {
			glog.V(4).Infof("Deleting %d deployer pods for deployment %s", len(deployerPods), deployutil.LabelForDeployment(deployment))
		}
		cleanedAll := true
		for _, deployerPod := range deployerPods {
			if err := c.podClient.deletePod(deployerPod.Namespace, deployerPod.Name); err != nil {
				if !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 %s/%s for deployment %s: %v", deployment.Namespace, deployerPod.Name, deployutil.LabelForDeployment(deployment), err))
					cleanedAll = false
				}
				// Already deleted
			} else {
				glog.V(4).Infof("Deleted completed deployer pod %s/%s for deployment %s", deployment.Namespace, deployerPod.Name, deployutil.LabelForDeployment(deployment))
			}
		}

		if !cleanedAll {
			return fmt.Errorf("couldn't clean up all deployer pods for %s", deployutil.LabelForDeployment(deployment))
		}
	}

	if deployutil.CanTransitionPhase(currentStatus, nextStatus) || deploymentScaled {
		deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus)
		if _, err := c.deploymentClient.updateDeployment(deployment.Namespace, deployment); err != nil {
			if config, decodeErr := c.decodeConfig(deployment); decodeErr == nil {
				c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedUpdate", "Cannot update deployment %s status to %s: %v", deployutil.LabelForDeployment(deployment), nextStatus, err)
			} else {
				c.recorder.Eventf(deployment, kapi.EventTypeWarning, "FailedUpdate", "Cannot update deployment %s status to %s: %v", deployutil.LabelForDeployment(deployment), nextStatus, err)
			}
			return fmt.Errorf("couldn't update deployment %s to status %s: %v", deployutil.LabelForDeployment(deployment), nextStatus, err)
		}
		glog.V(4).Infof("Updated deployment %s status from %s to %s (scale: %d)", deployutil.LabelForDeployment(deployment), currentStatus, nextStatus, deployment.Spec.Replicas)
	}
	return nil
}
Exemplo n.º 3
0
func nextStatusComp(fromDeployer, fromPath deployapi.DeploymentStatus) deployapi.DeploymentStatus {
	if deployutil.CanTransitionPhase(fromPath, fromDeployer) {
		return fromDeployer
	}
	return fromPath
}
Exemplo n.º 4
0
// Handle syncs pod's status with any associated deployment.
func (c *DeployerPodController) Handle(pod *kapi.Pod) error {
	// Find the deployment associated with the deployer pod.
	deploymentName := deployutil.DeploymentNameFor(pod)
	if len(deploymentName) == 0 {
		return nil
	}
	// Reject updates to anything but the main deployer pod
	// TODO: Find a way to filter this on the watch side.
	if pod.Name != deployutil.DeployerPodNameForDeployment(deploymentName) {
		return nil
	}

	deployment := &kapi.ReplicationController{ObjectMeta: kapi.ObjectMeta{Namespace: pod.Namespace, Name: deploymentName}}
	cached, exists, err := c.store.Get(deployment)
	if err == nil && exists {
		// Try to use the cache first. Trust hits and return them.
		deployment = cached.(*kapi.ReplicationController)
	} else {
		// Double-check with the master for cache misses/errors, since those
		// are rare and API calls are expensive but more reliable.
		deployment, err = c.kClient.ReplicationControllers(pod.Namespace).Get(deploymentName)
	}

	// If the deployment for this pod has disappeared, we should clean up this
	// and any other deployer pods, then bail out.
	if err != nil {
		// Some retrieval error occurred. Retry.
		if !kerrors.IsNotFound(err) {
			return fmt.Errorf("couldn't get deployment %s/%s which owns deployer pod %s/%s", pod.Namespace, deploymentName, pod.Name, pod.Namespace)
		}
		// Find all the deployer pods for the deployment (including this one).
		opts := kapi.ListOptions{LabelSelector: deployutil.DeployerPodSelector(deploymentName)}
		deployers, err := c.kClient.Pods(pod.Namespace).List(opts)
		if err != nil {
			// Retry.
			return fmt.Errorf("couldn't get deployer pods for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}
		// Delete all deployers.
		for _, deployer := range deployers.Items {
			err := c.kClient.Pods(deployer.Namespace).Delete(deployer.Name, kapi.NewDeleteOptions(0))
			if err != nil {
				if !kerrors.IsNotFound(err) {
					// TODO: Should this fire an event?
					glog.V(2).Infof("Couldn't delete orphaned deployer pod %s/%s: %v", deployer.Namespace, deployer.Name, err)
				}
			} else {
				// TODO: Should this fire an event?
				glog.V(2).Infof("Deleted orphaned deployer pod %s/%s", deployer.Namespace, deployer.Name)
			}
		}
		return nil
	}

	currentStatus := deployutil.DeploymentStatusFor(deployment)
	nextStatus := currentStatus

	switch pod.Status.Phase {
	case kapi.PodRunning:
		nextStatus = deployapi.DeploymentStatusRunning

	case kapi.PodSucceeded:
		nextStatus = deployapi.DeploymentStatusComplete

		config, decodeErr := c.decodeConfig(deployment)
		// If the deployment was cancelled just prior to the deployer pod succeeding
		// then we need to remove the cancel annotations from the complete deployment
		// and emit an event letting users know their cancellation failed.
		if deployutil.IsDeploymentCancelled(deployment) {
			delete(deployment.Annotations, deployapi.DeploymentCancelledAnnotation)
			delete(deployment.Annotations, deployapi.DeploymentStatusReasonAnnotation)

			if decodeErr == nil {
				c.recorder.Eventf(config, kapi.EventTypeWarning, "FailedCancellation", "Deployment %q succeeded before cancel recorded", deployutil.LabelForDeployment(deployment))
			} else {
				c.recorder.Event(deployment, kapi.EventTypeWarning, "FailedCancellation", "Succeeded before cancel recorded")
			}
		}
		// Sync the internal replica annotation with the target so that we can
		// distinguish deployer updates from other scaling events.
		deployment.Annotations[deployapi.DeploymentReplicasAnnotation] = deployment.Annotations[deployapi.DesiredReplicasAnnotation]
		if nextStatus == deployapi.DeploymentStatusComplete {
			delete(deployment.Annotations, deployapi.DesiredReplicasAnnotation)
		}

		// reset the size of any test container, since we are the ones updating the RC
		if decodeErr == nil && config.Spec.Test {
			deployment.Spec.Replicas = 0
		}
	case kapi.PodFailed:
		nextStatus = deployapi.DeploymentStatusFailed

		// reset the size of any test container, since we are the ones updating the RC
		if config, err := c.decodeConfig(deployment); err == nil && config.Spec.Test {
			deployment.Spec.Replicas = 0
		}
	}

	if deployutil.CanTransitionPhase(currentStatus, nextStatus) {
		deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus)
		if _, err := c.kClient.ReplicationControllers(deployment.Namespace).Update(deployment); err != nil {
			if kerrors.IsNotFound(err) {
				return nil
			}
			return fmt.Errorf("couldn't update Deployment %s to status %s: %v", deployutil.LabelForDeployment(deployment), nextStatus, err)
		}
		glog.V(4).Infof("Updated deployment %s status from %s to %s (scale: %d)", deployutil.LabelForDeployment(deployment), currentStatus, nextStatus, deployment.Spec.Replicas)

		// If the deployment was canceled, trigger a reconcilation of its deployment config
		// so that the latest complete deployment can immediately rollback in place of the
		// canceled deployment.
		if nextStatus == deployapi.DeploymentStatusFailed && deployutil.IsDeploymentCancelled(deployment) {
			// If we are unable to get the deployment config, then the deploymentconfig controller will
			// perform its duties once the resync interval forces the deploymentconfig to be reconciled.
			name := deployutil.DeploymentConfigNameFor(deployment)
			kclient.RetryOnConflict(kclient.DefaultRetry, func() error {
				config, err := c.client.DeploymentConfigs(deployment.Namespace).Get(name)
				if err != nil {
					return err
				}
				if config.Annotations == nil {
					config.Annotations = make(map[string]string)
				}
				config.Annotations[deployapi.DeploymentCancelledAnnotation] = strconv.Itoa(config.Status.LatestVersion)
				_, err = c.client.DeploymentConfigs(config.Namespace).Update(config)
				return err
			})
		}
	}

	return nil
}