func describeDeploymentPodSummaryInline(deploy *kapi.ReplicationController, includeEmpty bool) string {
s := describeDeploymentPodSummary(deploy, includeEmpty)
if len(s) == 0 {
return s
}
change := ""
if changing, ok := deployutil.DeploymentDesiredReplicas(deploy); ok {
switch {
case changing < deploy.Spec.Replicas:
change = fmt.Sprintf(" reducing to %d", changing)
case changing > deploy.Spec.Replicas:
change = fmt.Sprintf(" growing to %d", changing)
}
}
return fmt.Sprintf(" - %s%s", s, change)
}
// 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.ReplicationControllerList, 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 nil
}
activeDeployment := deployutil.ActiveDeployment(config, 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:
oldReplicas := config.Spec.Replicas
config.Spec.Replicas = activeReplicas
var err error
config, err = c.osClient.DeploymentConfigs(config.Namespace).Update(config)
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.
for _, deployment := range existingDeployments.Items {
isActiveDeployment := activeDeployment != nil && deployment.Name == activeDeployment.Name
oldReplicaCount := deployment.Spec.Replicas
newReplicaCount := 0
if isActiveDeployment {
newReplicaCount = activeReplicas
}
if config.Spec.Test {
glog.V(4).Infof("Deployment config %q is test and deployment %q will be scaled down", deployutil.LabelForDeploymentConfig(config), deployutil.LabelForDeployment(&deployment))
newReplicaCount = 0
}
lastReplicas, hasLastReplicas := deployutil.DeploymentReplicas(&deployment)
// Only update if necessary.
if !hasLastReplicas || newReplicaCount != oldReplicaCount || lastReplicas != newReplicaCount {
deployment.Spec.Replicas = newReplicaCount
deployment.Annotations[deployapi.DeploymentReplicasAnnotation] = strconv.Itoa(newReplicaCount)
_, err := c.kubeClient.ReplicationControllers(deployment.Namespace).Update(&deployment)
if err != nil {
c.recorder.Eventf(config, kapi.EventTypeWarning, "DeploymentScaleFailed",
"Failed to scale deployment %q from %d to %d: %s", deployment.Name, oldReplicaCount, newReplicaCount, err)
return err
}
// Only report scaling events if we changed the replica count.
if oldReplicaCount != newReplicaCount {
c.recorder.Eventf(config, kapi.EventTypeNormal, "DeploymentScaled",
"Scaled deployment %q from %d to %d", deployment.Name, oldReplicaCount, newReplicaCount)
} else {
glog.V(4).Infof("Updated deployment %q replica annotation to match current replica count %d", deployutil.LabelForDeployment(&deployment), newReplicaCount)
}
}
}
return c.updateStatus(config)
}
// 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 deployment config 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.ByLatestVersionDesc(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{Size: -1, ResourceVersion: ""}, 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)
}
// 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
oldReplicaCount := deployment.Spec.Replicas
newReplicaCount := int32(0)
if isActiveDeployment {
newReplicaCount = activeReplicas
}
if config.Spec.Test {
glog.V(4).Infof("Deployment config %q is test and deployment %q will be scaled down", deployutil.LabelForDeploymentConfig(config), deployutil.LabelForDeployment(&deployment))
newReplicaCount = 0
}
lastReplicas, hasLastReplicas := deployutil.DeploymentReplicas(&deployment)
// Only update if necessary.
var copied *kapi.ReplicationController
if !hasLastReplicas || newReplicaCount != oldReplicaCount || lastReplicas != newReplicaCount {
if err := kclient.RetryOnConflict(kclient.DefaultBackoff, func() error {
// refresh the replication controller version
rc, err := c.rcStore.ReplicationControllers(deployment.Namespace).Get(deployment.Name)
if err != nil {
return err
}
copied, err = deployutil.DeploymentDeepCopy(rc)
if err != nil {
glog.V(2).Infof("Deep copy of deployment %q failed: %v", rc.Name, err)
return err
}
copied.Spec.Replicas = newReplicaCount
copied.Annotations[deployapi.DeploymentReplicasAnnotation] = strconv.Itoa(int(newReplicaCount))
_, err = c.rn.ReplicationControllers(copied.Namespace).Update(copied)
return err
}); err != nil {
c.recorder.Eventf(config, kapi.EventTypeWarning, "DeploymentScaleFailed",
"Failed to scale deployment %q from %d to %d: %v", deployment.Name, oldReplicaCount, newReplicaCount, err)
return err
}
// Only report scaling events if we changed the replica count.
if oldReplicaCount != newReplicaCount {
c.recorder.Eventf(config, kapi.EventTypeNormal, "DeploymentScaled",
"Scaled deployment %q from %d to %d", copied.Name, oldReplicaCount, newReplicaCount)
} else {
glog.V(4).Infof("Updated deployment %q replica annotation to match current replica count %d", deployutil.LabelForDeployment(copied), newReplicaCount)
}
toAppend = *copied
}
updatedDeployments = append(updatedDeployments, toAppend)
}
// As the deployment configuration has changed, we need to make sure to clean
// up old deployments if we have now reached our deployment history quota
if err := c.cleanupOldDeployments(existingDeployments, config); err != nil {
c.recorder.Eventf(config, kapi.EventTypeWarning, "DeploymentCleanupFailed", "Couldn't clean up deployments: %v", err)
}
return c.updateStatus(config, updatedDeployments)
}
// 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.ReplicationControllerList, 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 nil
}
activeDeployment := deployutil.ActiveDeployment(config, 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.
//
// This takes into account resources predating the propagation behavior
// change, as well as external modifications to the deployments (e.g.
// scalers).
activeReplicas := config.Template.ControllerTemplate.Replicas
source := "the deploymentConfig itself (no change)"
if activeDeployment != nil {
activeDeploymentIsLatest := activeDeployment.Name == latestDeployment.Name
lastActiveReplicas, hasLastActiveReplicas := deployutil.DeploymentReplicas(activeDeployment)
if activeDeploymentIsLatest {
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))
}
} else {
if hasLastActiveReplicas {
if lastActiveReplicas != activeDeployment.Spec.Replicas && activeDeployment.Spec.Replicas > 0 {
activeReplicas = activeDeployment.Spec.Replicas
source = fmt.Sprintf("the active deployment %q which was scaled directly", deployutil.LabelForDeployment(activeDeployment))
}
} 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))
} else {
latestDesiredReplicas, latestHasDesiredReplicas := deployutil.DeploymentDesiredReplicas(latestDeployment)
if latestHasDesiredReplicas {
activeReplicas = latestDesiredReplicas
source = fmt.Sprintf("the desired replicas of latest deployment %q which has not been previously synced", deployutil.LabelForDeployment(latestDeployment))
}
}
}
}
} else {
latestDesiredReplicas, latestHasDesiredReplicas := deployutil.DeploymentDesiredReplicas(latestDeployment)
if latestHasDesiredReplicas {
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 config.Template.ControllerTemplate.Replicas != activeReplicas {
oldReplicas := config.Template.ControllerTemplate.Replicas
config.Template.ControllerTemplate.Replicas = activeReplicas
_, err := c.osClient.DeploymentConfigs(config.Namespace).Update(config)
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.
for _, deployment := range existingDeployments.Items {
isActiveDeployment := activeDeployment != nil && deployment.Name == activeDeployment.Name
oldReplicaCount := deployment.Spec.Replicas
newReplicaCount := 0
if isActiveDeployment {
newReplicaCount = activeReplicas
}
lastReplicas, hasLastReplicas := deployutil.DeploymentReplicas(&deployment)
// Only update if necessary.
if !hasLastReplicas || newReplicaCount != oldReplicaCount || lastReplicas != newReplicaCount {
deployment.Spec.Replicas = newReplicaCount
deployment.Annotations[deployapi.DeploymentReplicasAnnotation] = strconv.Itoa(newReplicaCount)
_, err := c.kubeClient.ReplicationControllers(deployment.Namespace).Update(&deployment)
if err != nil {
c.recorder.Eventf(config, "DeploymentScaleFailed",
"Failed to scale deployment %q from %d to %d: %s", deployment.Name, oldReplicaCount, newReplicaCount, err)
return err
}
// Only report scaling events if we changed the replica count.
if oldReplicaCount != newReplicaCount {
c.recorder.Eventf(config, "DeploymentScaled",
"Scaled deployment %q from %d to %d", deployment.Name, oldReplicaCount, newReplicaCount)
} else {
glog.V(4).Infof("Updated deployment %q replica annotation to match current replica count %d", deployutil.LabelForDeployment(&deployment), newReplicaCount)
}
}
}
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
}
// Deploy starts the deployment process for rcName.
func (d *Deployer) Deploy(namespace, rcName string) error {
// Look up the new deployment.
to, err := d.getDeployment(namespace, rcName)
if err != nil {
return fmt.Errorf("couldn't get deployment %s: %v", rcName, err)
}
// Decode the config from the deployment.
config, err := deployutil.DecodeDeploymentConfig(to, kapi.Codecs.UniversalDecoder())
if err != nil {
return fmt.Errorf("couldn't decode deployment config from deployment %s: %v", to.Name, err)
}
// Get a strategy for the deployment.
s, 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 already run to completion", to.Name)
}
// 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.ByLatestVersionDesc(deployments))
// Find any last completed deployment.
var from *kapi.ReplicationController
for _, candidate := range deployments {
if candidate.Name == to.Name {
continue
}
if deployutil.IsCompleteDeployment(&candidate) {
from = &candidate
break
}
}
if deployutil.DeploymentVersionFor(to) < deployutil.DeploymentVersionFor(from) {
return fmt.Errorf("deployment %s is older than %s", to.Name, from.Name)
}
// 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{Size: -1, ResourceVersion: ""}, retryWaitParams, retryWaitParams); err != nil {
fmt.Fprintf(d.errOut, "error: Couldn't scale down prior deployment %s: %v\n", deployutil.LabelForDeployment(&candidate), err)
} else {
fmt.Fprintf(d.out, "--> Scaled older deployment %s down\n", candidate.Name)
}
}
if d.until == "start" {
return strategy.NewConditionReachedErr("Ready to start deployment")
}
// Perform the deployment.
if err := s.Deploy(from, to, int(desiredReplicas)); err != nil {
return err
}
fmt.Fprintf(d.out, "--> Success\n")
return nil
}
// TestHandle_updateOk ensures that an updated config (version >0) results in
// a new deployment with the appropriate replica count based on a variety of
// existing prior deployments.
func TestHandle_updateOk(t *testing.T) {
var (
config *deployapi.DeploymentConfig
deployed *kapi.ReplicationController
existingDeployments *kapi.ReplicationControllerList
)
controller := &DeploymentConfigController{
makeDeployment: func(config *deployapi.DeploymentConfig) (*kapi.ReplicationController, error) {
return deployutil.MakeDeployment(config, api.Codec)
},
deploymentClient: &deploymentClientImpl{
createDeploymentFunc: func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
deployed = deployment
return deployment, nil
},
listDeploymentsForConfigFunc: func(namespace, configName string) (*kapi.ReplicationControllerList, error) {
return existingDeployments, nil
},
updateDeploymentFunc: func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
t.Fatalf("unexpected update call with deployment %v", deployment)
return nil, nil
},
},
osClient: testclient.NewSimpleFake(),
}
type existing struct {
version int
replicas int
status deployapi.DeploymentStatus
}
type scenario struct {
version int
expectedReplicas int
existing []existing
}
scenarios := []scenario{
{1, 1, []existing{}},
{2, 1, []existing{
{1, 1, deployapi.DeploymentStatusComplete},
}},
{3, 4, []existing{
{1, 0, deployapi.DeploymentStatusComplete},
{2, 4, deployapi.DeploymentStatusComplete},
}},
{3, 4, []existing{
{1, 4, deployapi.DeploymentStatusComplete},
{2, 1, deployapi.DeploymentStatusFailed},
}},
{4, 2, []existing{
{1, 0, deployapi.DeploymentStatusComplete},
{2, 0, deployapi.DeploymentStatusFailed},
{3, 2, deployapi.DeploymentStatusComplete},
}},
// Scramble the order of the previous to ensure we still get it right.
{4, 2, []existing{
{2, 0, deployapi.DeploymentStatusFailed},
{3, 2, deployapi.DeploymentStatusComplete},
{1, 0, deployapi.DeploymentStatusComplete},
}},
}
for _, scenario := range scenarios {
deployed = nil
config = deploytest.OkDeploymentConfig(scenario.version)
config.Triggers = []deployapi.DeploymentTriggerPolicy{}
existingDeployments = &kapi.ReplicationControllerList{}
for _, e := range scenario.existing {
d, _ := deployutil.MakeDeployment(deploytest.OkDeploymentConfig(e.version), api.Codec)
d.Spec.Replicas = e.replicas
d.Annotations[deployapi.DeploymentStatusAnnotation] = string(e.status)
existingDeployments.Items = append(existingDeployments.Items, *d)
}
err := controller.Handle(config)
if deployed == nil {
t.Fatalf("expected a deployment")
}
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
desired, hasDesired := deployutil.DeploymentDesiredReplicas(deployed)
if !hasDesired {
t.Fatalf("expected desired replicas")
}
if e, a := scenario.expectedReplicas, desired; e != a {
t.Errorf("expected desired replicas %d, got %d", e, a)
}
}
}