// 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) } } }
// 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 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, "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, "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, "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, "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 { deployerPod.Spec.ActiveDeadlineSeconds = &zeroDelay if _, err := c.podClient.updatePod(deployerPod.Namespace, &deployerPod); err != nil { c.recorder.Eventf(deployment, "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", deployutil.LabelForDeployment(deployment), err) } glog.V(4).Infof("Cancelled deployer pod %s for deployment %s", deployerPod.Name, deployutil.LabelForDeployment(deployment)) } } c.recorder.Eventf(deployment, "cancelled", "Cancelled deployment") } case deployapi.DeploymentStatusFailed: // Nothing to do in this terminal state. glog.V(4).Infof("Ignoring deployment %s (status %s)", deployutil.LabelForDeployment(deployment), currentStatus) case deployapi.DeploymentStatusComplete: // 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) } 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 kutil.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 currentStatus != nextStatus { deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus) if _, err := c.deploymentClient.updateDeployment(deployment.Namespace, deployment); err != nil { c.recorder.Eventf(deployment, "failedUpdate", "Error updating deployment %s status to %s", deployutil.LabelForDeployment(deployment), nextStatus) 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", deployutil.LabelForDeployment(deployment), currentStatus, nextStatus) } return nil }
// Deploy starts the deployment process for deploymentName. func (d *Deployer) Deploy(namespace, deploymentName string) error { // Look up the new deployment. to, err := d.getDeployment(namespace, deploymentName) if err != nil { return fmt.Errorf("couldn't get deployment %s/%s: %v", namespace, deploymentName, err) } // Decode the config from the deployment. config, err := deployutil.DecodeDeploymentConfig(to, latest.Codec) if err != nil { return fmt.Errorf("couldn't decode DeploymentConfig from deployment %s/%s: %v", to.Namespace, to.Name, err) } // Get a strategy for the deployment. strategy, err := d.strategyFor(config) if err != nil { return err } // New deployments must have a desired replica count. desiredReplicas, hasDesired := deployutil.DeploymentDesiredReplicas(to) if !hasDesired { return fmt.Errorf("deployment %s has no desired replica count", deployutil.LabelForDeployment(to)) } // Find all deployments for the config. unsortedDeployments, err := d.getDeployments(namespace, config.Name) if err != nil { return fmt.Errorf("couldn't get controllers in namespace %s: %v", namespace, err) } deployments := unsortedDeployments.Items // Sort all the deployments by version. sort.Sort(deployutil.DeploymentsByLatestVersionDesc(deployments)) // Find any last completed deployment. var from *kapi.ReplicationController for _, candidate := range deployments { if candidate.Name == to.Name { continue } if deployutil.DeploymentStatusFor(&candidate) == deployapi.DeploymentStatusComplete { from = &candidate break } } // Scale down any deployments which aren't the new or last deployment. for _, candidate := range deployments { // Skip the from/to deployments. if candidate.Name == to.Name { continue } if from != nil && candidate.Name == from.Name { continue } // Skip the deployment if it's already scaled down. if candidate.Spec.Replicas == 0 { continue } // Scale the deployment down to zero. retryWaitParams := kubectl.NewRetryParams(1*time.Second, 120*time.Second) if err := d.scaler.Scale(candidate.Namespace, candidate.Name, uint(0), &kubectl.ScalePrecondition{-1, ""}, retryWaitParams, retryWaitParams); err != nil { glog.Errorf("Couldn't scale down prior deployment %s: %v", deployutil.LabelForDeployment(&candidate), err) } else { glog.Infof("Scaled down prior deployment %s", deployutil.LabelForDeployment(&candidate)) } } // Perform the deployment. if from == nil { glog.Infof("Deploying %s for the first time (replicas: %d)", deployutil.LabelForDeployment(to), desiredReplicas) } else { glog.Infof("Deploying from %s to %s (replicas: %d)", deployutil.LabelForDeployment(from), deployutil.LabelForDeployment(to), desiredReplicas) } return strategy.Deploy(from, to, desiredReplicas) }
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/GoogleCloudPlatform/kubernetes/pull/7183 to, err = s.client.GetReplicationController(to.Namespace, to.Name) if err != nil { return fmt.Errorf("couldn't look up deployment %s: %s", deployutil.LabelForDeployment(to)) } if _, hasSourceId := to.Annotations[sourceIdAnnotation]; !hasSourceId { to.Annotations[sourceIdAnnotation] = fmt.Sprintf("%s:%s", from.Name, from.ObjectMeta.UID) if updated, err := s.client.UpdateReplicationController(to.Namespace, to); err != nil { return fmt.Errorf("couldn't assign source annotation to deployment %s: %v", deployutil.LabelForDeployment(to), err) } else { to = updated } } // 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/GoogleCloudPlatform/kubernetes/pull/7183 to.Spec.Replicas = 1 // Perform a rolling update. rollingConfig := &kubectl.RollingUpdaterConfig{ Out: &rollingUpdaterWriter{}, OldRc: from, NewRc: to, UpdatePeriod: time.Duration(*params.UpdatePeriodSeconds) * time.Second, Interval: time.Duration(*params.IntervalSeconds) * time.Second, Timeout: time.Duration(*params.TimeoutSeconds) * time.Second, CleanupPolicy: kubectl.PreserveRollingUpdateCleanupPolicy, UpdateAcceptor: updateAcceptor, } glog.Infof("Starting rolling update from %s to %s (desired replicas: %d, UpdatePeriodSeconds=%d, IntervalSeconds=%d, TimeoutSeconds=%d)", deployutil.LabelForDeployment(from), deployutil.LabelForDeployment(to), desiredReplicas, *params.UpdatePeriodSeconds, *params.IntervalSeconds, *params.TimeoutSeconds, ) if err := s.rollingUpdate(rollingConfig); 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.Info("Post hook finished") } } return nil }
// 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, err := c.deploymentClient.getDeployment(pod.Namespace, 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 occured. 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). deployers, err := c.deployerPodsFor(pod.Namespace, deploymentName) 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.deletePod(deployer.Namespace, deployer.Name) 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: // Detect failure based on the container state nextStatus = deployapi.DeploymentStatusComplete for _, info := range pod.Status.ContainerStatuses { if info.State.Termination != nil && info.State.Termination.ExitCode != 0 { nextStatus = deployapi.DeploymentStatusFailed } } case kapi.PodFailed: // if the deployment is already marked Failed, do not attempt clean up again if currentStatus != deployapi.DeploymentStatusFailed { // clean up will also update the deployment status to Failed // failure to clean up will result in retries and // the deployment will not be marked Failed // Note: this will prevent new deployments from being created for this config err := c.cleanupFailedDeployment(deployment) if err != nil { return transientError(fmt.Sprintf("couldn't clean up failed deployment: %v", err)) } } } if currentStatus != nextStatus { deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(nextStatus) if _, err := c.deploymentClient.updateDeployment(deployment.Namespace, 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", deployutil.LabelForDeployment(deployment), currentStatus, nextStatus) } return nil }
func (c *DeployerPodController) cleanupFailedDeployment(deployment *kapi.ReplicationController) error { // Scale down the current failed deployment configName := deployutil.DeploymentConfigNameFor(deployment) existingDeployments, err := c.deploymentClient.listDeploymentsForConfig(deployment.Namespace, configName) if err != nil { return fmt.Errorf("couldn't list Deployments for DeploymentConfig %s: %v", configName, err) } desiredReplicas, ok := deployutil.DeploymentDesiredReplicas(deployment) if !ok { // if desired replicas could not be found, then log the error // and update the failed deployment // this cannot be treated as a transient error kutil.HandleError(fmt.Errorf("Could not determine desired replicas from %s to reset replicas for last completed deployment", deployutil.LabelForDeployment(deployment))) } if ok && len(existingDeployments.Items) > 0 { sort.Sort(deployutil.DeploymentsByLatestVersionDesc(existingDeployments.Items)) for index, existing := range existingDeployments.Items { // if a newer deployment exists: // - set the replicas for the current failed deployment to 0 // - there is no point in scaling up the last completed deployment // since that will be scaled down by the later deployment if index == 0 && existing.Name != deployment.Name { break } // the latest completed deployment is the one that needs to be scaled back up if deployutil.DeploymentStatusFor(&existing) == deployapi.DeploymentStatusComplete { if existing.Spec.Replicas == desiredReplicas { break } // scale back the completed deployment to the target of the failed deployment existing.Spec.Replicas = desiredReplicas if _, err := c.deploymentClient.updateDeployment(existing.Namespace, &existing); err != nil { if kerrors.IsNotFound(err) { return nil } return fmt.Errorf("couldn't update replicas to %d for deployment %s: %v", desiredReplicas, deployutil.LabelForDeployment(&existing), err) } glog.V(4).Infof("Updated replicas to %d for deployment %s", desiredReplicas, deployutil.LabelForDeployment(&existing)) break } } } // set the replicas for the failed deployment to 0 // and set the status to Failed deployment.Spec.Replicas = 0 deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(deployapi.DeploymentStatusFailed) if _, err := c.deploymentClient.updateDeployment(deployment.Namespace, deployment); err != nil { if kerrors.IsNotFound(err) { return nil } return fmt.Errorf("couldn't scale down the deployment %s and mark it as failed: %v", deployutil.LabelForDeployment(deployment), err) } glog.V(4).Infof("Scaled down the deployment %s and marked it as failed", deployutil.LabelForDeployment(deployment)) return nil }
// Handle processes config and creates a new deployment if necessary. func (c *DeploymentConfigController) Handle(config *deployapi.DeploymentConfig) error { // Only deploy when the version has advanced past 0. if config.LatestVersion == 0 { glog.V(5).Infof("Waiting for first version of %s", deployutil.LabelForDeploymentConfig(config)) return nil } // Check if any existing inflight deployments (any non-terminal state). existingDeployments, err := c.deploymentClient.listDeploymentsForConfig(config.Namespace, config.Name) if err != nil { return fmt.Errorf("couldn't list Deployments for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err) } var inflightDeployment *kapi.ReplicationController latestDeploymentExists := false for _, deployment := range existingDeployments.Items { // check if this is the latest deployment // we'll return after we've dealt with the multiple-active-deployments case if deployutil.DeploymentVersionFor(&deployment) == config.LatestVersion { latestDeploymentExists = true } deploymentStatus := deployutil.DeploymentStatusFor(&deployment) switch deploymentStatus { case deployapi.DeploymentStatusFailed, deployapi.DeploymentStatusComplete: // Previous deployment in terminal state - can ignore // Ignoring specific deployment states so that any newly introduced // deployment state will not be ignored default: if inflightDeployment == nil { inflightDeployment = &deployment continue } var deploymentForCancellation *kapi.ReplicationController if deployutil.DeploymentVersionFor(inflightDeployment) < deployutil.DeploymentVersionFor(&deployment) { deploymentForCancellation, inflightDeployment = inflightDeployment, &deployment } else { deploymentForCancellation = &deployment } deploymentForCancellation.Annotations[deployapi.DeploymentCancelledAnnotation] = deployapi.DeploymentCancelledAnnotationValue deploymentForCancellation.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentCancelledNewerDeploymentExists if _, err := c.deploymentClient.updateDeployment(deploymentForCancellation.Namespace, deploymentForCancellation); err != nil { util.HandleError(fmt.Errorf("couldn't cancel Deployment %s: %v", deployutil.LabelForDeployment(deploymentForCancellation), err)) } glog.V(4).Infof("Cancelled Deployment %s for DeploymentConfig %s", deployutil.LabelForDeployment(deploymentForCancellation), deployutil.LabelForDeploymentConfig(config)) } } // if the latest deployment exists then nothing else needs to be done if latestDeploymentExists { return nil } // check to see if there are inflight deployments if inflightDeployment != nil { // raise a transientError so that the deployment config can be re-queued glog.V(4).Infof("Found previous inflight Deployment for %s - will requeue", deployutil.LabelForDeploymentConfig(config)) return transientError(fmt.Sprintf("found previous inflight Deployment for %s - requeuing", deployutil.LabelForDeploymentConfig(config))) } // Try and build a deployment for the config. deployment, err := c.makeDeployment(config) if err != nil { return fatalError(fmt.Sprintf("couldn't make Deployment from (potentially invalid) DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err)) } // Compute the desired replicas for the deployment. Use the last completed // deployment's current replica count, or the config template if there is no // prior completed deployment available. desiredReplicas := config.Template.ControllerTemplate.Replicas if len(existingDeployments.Items) > 0 { sort.Sort(deployutil.DeploymentsByLatestVersionDesc(existingDeployments.Items)) for _, existing := range existingDeployments.Items { if deployutil.DeploymentStatusFor(&existing) == deployapi.DeploymentStatusComplete { desiredReplicas = existing.Spec.Replicas glog.V(4).Infof("Desired replicas for %s set to %d based on prior completed deployment %s", deployutil.LabelForDeploymentConfig(config), desiredReplicas, existing.Name) break } } } deployment.Annotations[deployapi.DesiredReplicasAnnotation] = strconv.Itoa(desiredReplicas) // Create the deployment. if _, err := c.deploymentClient.createDeployment(config.Namespace, deployment); err == nil { glog.V(4).Infof("Created Deployment for DeploymentConfig %s", deployutil.LabelForDeploymentConfig(config)) return nil } else { // If the deployment was already created, just move on. The cache could be stale, or another // process could have already handled this update. if errors.IsAlreadyExists(err) { glog.V(4).Infof("Deployment already exists for DeploymentConfig %s", deployutil.LabelForDeploymentConfig(config)) return nil } // log an event if the deployment could not be created that the user can discover c.recorder.Eventf(config, "failedCreate", "Error creating: %v", err) return fmt.Errorf("couldn't create Deployment for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err) } }
// 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 kubectl.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.Template.Strategy.RecreateParams retryParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout) waitParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout) // Execute any pre-hook. if params != nil && params.Pre != nil { if err := s.hookExecutor.Execute(params.Pre, to, "prehook"); err != nil { return fmt.Errorf("Pre hook failed: %s", err) } else { glog.Infof("Pre hook finished") } } // Scale down the from deployment. if from != nil { glog.Infof("Scaling %s down to zero", deployutil.LabelForDeployment(from)) _, err := s.scaleAndWait(from, 0, retryParams, waitParams) if err != nil { return fmt.Errorf("couldn't scale %s to 0: %v", deployutil.LabelForDeployment(from), err) } } // If an UpdateAcceptor is provided and we're trying to scale up to more // than one replica, scale up to 1 and validate the replica, aborting if the // replica isn't acceptable. if updateAcceptor != nil && desiredReplicas > 1 { glog.Infof("Scaling %s to 1 before validating first replica", deployutil.LabelForDeployment(to)) updatedTo, err := s.scaleAndWait(to, 1, retryParams, waitParams) if err != nil { return fmt.Errorf("couldn't scale %s to 1: %v", deployutil.LabelForDeployment(to), err) } glog.Infof("Validating first replica of %s", deployutil.LabelForDeployment(to)) if err := updateAcceptor.Accept(updatedTo); err != nil { return fmt.Errorf("first replica rejected for %s: %v", to.Name, err) } to = updatedTo } // Complete the scale up. glog.Infof("Scaling %s to %d", deployutil.LabelForDeployment(to), desiredReplicas) updatedTo, err := s.scaleAndWait(to, desiredReplicas, retryParams, waitParams) if err != nil { return fmt.Errorf("couldn't scale %s to %d: %v", deployutil.LabelForDeployment(to), desiredReplicas, err) } to = updatedTo // Execute any post-hook. Errors are logged and ignored. if params != nil && params.Post != nil { if err := s.hookExecutor.Execute(params.Post, to, "posthook"); err != nil { util.HandleError(fmt.Errorf("post hook failed: %s", err)) } else { glog.Infof("Post hook finished") } } glog.Infof("Deployment %s successfully made active", to.Name) return nil }
// 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)) } c.recorder.Eventf(config, "failedCreate", "Couldn't create initial deployment: %v", err) return fmt.Errorf("couldn't create initial Deployment for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err) } 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 }
func (c *FirstContainerReady) Accept(deployment *kapi.ReplicationController) error { // For now, only validate the first replica. if deployment.Spec.Replicas != 1 { glog.Infof("automatically accepting deployment %s with %d replicas", deployutil.LabelForDeployment(deployment), deployment.Spec.Replicas) return nil } // Try and find the pod for the deployment. pods, err := c.podsForDeployment(deployment) if err != nil { return fmt.Errorf("couldn't get pods for deployment %s: %v", deployutil.LabelForDeployment(deployment), err) } if len(pods.Items) == 0 { return fmt.Errorf("no pods found for deployment %s", deployutil.LabelForDeployment(deployment)) } // If we found multiple, use the first one and log a warning. // TODO: should finding multiple be an error? pod := &pods.Items[0] if len(pods.Items) > 1 { glog.Infof("Warning: more than one pod for deployment %s; basing canary check on the first pod '%s'", deployutil.LabelForDeployment(deployment), pod.Name) } // Make a pod store to poll and ensure it gets cleaned up. podStore, stopStore := c.getPodStore(pod.Namespace, pod.Name) defer close(stopStore) // Track container readiness based on those defined in the spec. observedContainers := map[string]bool{} for _, container := range pod.Spec.Containers { observedContainers[container.Name] = false } // Start checking for pod updates. glog.V(0).Infof("Waiting for pod %s/%s container readiness", pod.Namespace, pod.Name) err = wait.Poll(c.interval, c.timeout, func() (done bool, err error) { // Get the latest state of the pod. obj, exists, err := podStore.Get(pod) // Try again later on error or if the pod isn't available yet. if err != nil { glog.V(0).Infof("Error getting pod %s/%s to inspect container readiness: %v", pod.Namespace, pod.Name, err) return false, nil } if !exists { glog.V(0).Infof("Couldn't find pod %s/%s to inspect container readiness", pod.Namespace, pod.Name) return false, nil } // New pod state is available; update the observed ready status of any // containers. updatedPod := obj.(*kapi.Pod) for _, status := range updatedPod.Status.ContainerStatuses { // Ignore any containers which aren't defined in the deployment spec. if _, known := observedContainers[status.Name]; !known { glog.V(0).Infof("Ignoring readiness of container %s in pod %s/%s because it's not present in the pod spec", status.Name, pod.Namespace, pod.Name) continue } // The status of the container could be transient; we only care if it // was ever ready. If it was ready and then became not ready, we // consider it ready. if status.Ready { observedContainers[status.Name] = true } } // Check whether all containers have been observed as ready. allReady := true for _, ready := range observedContainers { if !ready { allReady = false break } } // If all containers have been ready once, return success. if allReady { glog.V(0).Infof("All containers ready for %s/%s", pod.Namespace, pod.Name) return true, nil } // Otherwise, try again later. glog.V(4).Infof("Still waiting for pod %s/%s container readiness; observed statuses: #%v", pod.Namespace, pod.Name, observedContainers) return false, nil }) if err != nil { if err == wait.ErrWaitTimeout { return fmt.Errorf("timed out waiting for pod %s/%s containers to become ready", pod.Namespace, pod.Name) } return fmt.Errorf("pod %s/%s failed readiness check: %v", pod.Namespace, pod.Name, err) } return nil }