// 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
}
func (s *RollingDeploymentStrategy) Deploy(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int) error {
config, err := deployutil.DecodeDeploymentConfig(to, s.decoder)
if err != nil {
return fmt.Errorf("couldn't decode DeploymentConfig from deployment %s: %v", deployutil.LabelForDeployment(to), err)
}
params := config.Spec.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 {
if err := s.hookExecutor.Execute(params.Pre, to, deployapi.PreHookPodSuffix, "pre"); err != nil {
return fmt.Errorf("Pre hook failed: %s", err)
}
}
// 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 {
if err := s.hookExecutor.Execute(params.Post, to, deployapi.PostHookPodSuffix, "post"); err != nil {
return fmt.Errorf("post hook failed: %s", err)
}
}
// All done.
return nil
}
// Prepare for a rolling update.
// Execute any pre-hook.
if params.Pre != nil {
if err := s.hookExecutor.Execute(params.Pre, to, deployapi.PreHookPodSuffix, "pre"); err != nil {
return fmt.Errorf("pre hook failed: %s", err)
}
}
if s.until == "pre" {
return strat.NewConditionReachedErr("pre hook succeeded")
}
if s.until == "0%" {
return strat.NewConditionReachedErr("Reached 0% (before rollout)")
}
// 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", to.Name, err)
if kerrors.IsNotFound(err) {
return false, fmt.Errorf("%s", msg)
}
// Try again.
fmt.Fprintln(s.errOut, "error:", 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", existing.Name, err)
if kerrors.IsNotFound(err) {
return false, fmt.Errorf("%s", msg)
}
// Try again.
fmt.Fprintln(s.errOut, "error:", 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
// Perform a rolling update.
rollingConfig := &kubectl.RollingUpdaterConfig{
Out: &rollingUpdaterWriter{w: s.out},
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,
MaxSurge: params.MaxSurge,
MaxUnavailable: params.MaxUnavailable,
OnProgress: func(oldRc, newRc *kapi.ReplicationController, percentage int) error {
if expect, ok := strat.Percentage(s.until); ok && percentage >= expect {
return strat.NewConditionReachedErr(fmt.Sprintf("Reached %s (currently %d%%)", s.until, percentage))
}
return nil
},
}
if err := s.rollingUpdate(rollingConfig); err != nil {
return err
}
// Execute any post-hook.
if params.Post != nil {
if err := s.hookExecutor.Execute(params.Post, to, deployapi.PostHookPodSuffix, "post"); err != nil {
return fmt.Errorf("post hook failed: %s", err)
}
}
return nil
}
// 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.decoder)
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.retryTimeout)
if updateAcceptor == nil {
updateAcceptor = s.getUpdateAcceptor(time.Duration(*params.TimeoutSeconds)*time.Second, config.Spec.MinReadySeconds)
}
// Execute any pre-hook.
if params != nil && params.Pre != nil {
if err := s.hookExecutor.Execute(params.Pre, to, deployapi.PreHookPodSuffix, "pre"); err != nil {
return fmt.Errorf("pre hook failed: %s", err)
}
}
if s.until == "pre" {
return strat.NewConditionReachedErr("pre hook succeeded")
}
// Record all warnings
defer stratutil.RecordConfigWarnings(s.eventClient, from, s.decoder, s.out)
defer stratutil.RecordConfigWarnings(s.eventClient, to, s.decoder, s.out)
// Scale down the from deployment.
if from != nil {
fmt.Fprintf(s.out, "--> Scaling %s down to zero\n", from.Name)
_, err := s.scaleAndWait(from, 0, retryParams, waitParams)
if err != nil {
return fmt.Errorf("couldn't scale %s to 0: %v", from.Name, err)
}
}
if s.until == "0%" {
return strat.NewConditionReachedErr("Reached 0% (no running pods)")
}
if params != nil && params.Mid != nil {
if err := s.hookExecutor.Execute(params.Mid, to, deployapi.MidHookPodSuffix, "mid"); err != nil {
return fmt.Errorf("mid hook failed: %s", err)
}
}
if s.until == "mid" {
return strat.NewConditionReachedErr("mid hook succeeded")
}
accepted := false
// Scale up the to deployment.
if desiredReplicas > 0 {
if from != nil {
// Scale up to 1 and validate the replica,
// aborting if the replica isn't acceptable.
fmt.Fprintf(s.out, "--> Scaling %s to 1 before performing acceptance check\n", to.Name)
updatedTo, err := s.scaleAndWait(to, 1, retryParams, waitParams)
if err != nil {
return fmt.Errorf("couldn't scale %s to 1: %v", to.Name, err)
}
if err := updateAcceptor.Accept(updatedTo); err != nil {
return fmt.Errorf("update acceptor rejected %s: %v", to.Name, err)
}
accepted = true
to = updatedTo
if strat.PercentageBetween(s.until, 1, 99) {
return strat.NewConditionReachedErr(fmt.Sprintf("Reached %s", s.until))
}
}
// Complete the scale up.
if to.Spec.Replicas != int32(desiredReplicas) {
fmt.Fprintf(s.out, "--> Scaling %s to %d\n", to.Name, desiredReplicas)
updatedTo, err := s.scaleAndWait(to, desiredReplicas, retryParams, waitParams)
if err != nil {
return fmt.Errorf("couldn't scale %s to %d: %v", to.Name, desiredReplicas, err)
}
to = updatedTo
}
if !accepted {
if err := updateAcceptor.Accept(to); err != nil {
return fmt.Errorf("update acceptor rejected %s: %v", to.Name, err)
}
}
}
if (from == nil && strat.PercentageBetween(s.until, 1, 100)) || (from != nil && s.until == "100%") {
return strat.NewConditionReachedErr(fmt.Sprintf("Reached %s", s.until))
}
// Execute any post-hook.
if params != nil && params.Post != nil {
if err := s.hookExecutor.Execute(params.Post, to, deployapi.PostHookPodSuffix, "post"); err != nil {
return fmt.Errorf("post hook failed: %s", err)
}
}
return nil
}
