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recreate.go
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recreate.go
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package recreate
import (
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/scale"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
kapi "k8s.io/kubernetes/pkg/apis/core"
kclientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
kcoreclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/internalversion"
appsapi "github.com/openshift/origin/pkg/apps/apis/apps"
strat "github.com/openshift/origin/pkg/apps/strategy"
stratsupport "github.com/openshift/origin/pkg/apps/strategy/support"
stratutil "github.com/openshift/origin/pkg/apps/strategy/util"
appsutil "github.com/openshift/origin/pkg/apps/util"
imageclient "github.com/openshift/origin/pkg/image/generated/internalclientset/typed/image/internalversion"
)
// RecreateDeploymentStrategy is a simple strategy appropriate as a default.
// Its behavior is to scale down the last deployment to 0, and to scale up the
// new deployment to 1.
//
// A failure to disable any existing deployments will be considered a
// deployment failure.
type RecreateDeploymentStrategy struct {
// out and errOut control where output is sent during the strategy
out, errOut io.Writer
// until is a condition that, if reached, will cause the strategy to exit early
until string
// rcClient is a client to access replication controllers
rcClient kcoreclient.ReplicationControllersGetter
// scaleClient is a client to access scaling
scaleClient scale.ScalesGetter
// podClient is used to list and watch pods.
podClient kcoreclient.PodsGetter
// eventClient is a client to access events
eventClient kcoreclient.EventsGetter
// getUpdateAcceptor returns an UpdateAcceptor to verify the first replica
// of the deployment.
getUpdateAcceptor func(time.Duration, int32) strat.UpdateAcceptor
// codec is used to decode DeploymentConfigs contained in deployments.
decoder runtime.Decoder
// hookExecutor can execute a lifecycle hook.
hookExecutor stratsupport.HookExecutor
// events records the events
events record.EventSink
}
// NewRecreateDeploymentStrategy makes a RecreateDeploymentStrategy backed by
// a real HookExecutor and client.
func NewRecreateDeploymentStrategy(client kclientset.Interface, tagClient imageclient.ImageStreamTagsGetter,
events record.EventSink, decoder runtime.Decoder, out, errOut io.Writer, until string) *RecreateDeploymentStrategy {
if out == nil {
out = ioutil.Discard
}
if errOut == nil {
errOut = ioutil.Discard
}
return &RecreateDeploymentStrategy{
out: out,
errOut: errOut,
events: events,
until: until,
rcClient: client.Core(),
scaleClient: appsutil.NewReplicationControllerV1ScaleClient(client),
eventClient: client.Core(),
podClient: client.Core(),
getUpdateAcceptor: func(timeout time.Duration, minReadySeconds int32) strat.UpdateAcceptor {
return stratsupport.NewAcceptAvailablePods(out, client.Core(), timeout)
},
decoder: decoder,
hookExecutor: stratsupport.NewHookExecutor(client.Core(), tagClient, client.Core(), os.Stdout, decoder),
}
}
// Deploy makes deployment active and disables oldDeployments.
func (s *RecreateDeploymentStrategy) Deploy(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int) error {
return s.DeployWithAcceptor(from, to, desiredReplicas, 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 := appsutil.DecodeDeploymentConfig(to, s.decoder)
if err != nil {
return fmt.Errorf("couldn't decode config from deployment %s: %v", to.Name, err)
}
recreateTimeout := time.Duration(appsapi.DefaultRecreateTimeoutSeconds) * time.Second
params := config.Spec.Strategy.RecreateParams
rollingParams := config.Spec.Strategy.RollingParams
if params != nil && params.TimeoutSeconds != nil {
recreateTimeout = time.Duration(*params.TimeoutSeconds) * time.Second
}
// When doing the initial rollout for rolling strategy we use recreate and for that we
// have to set the TimeoutSecond based on the rollling strategy parameters.
if rollingParams != nil && rollingParams.TimeoutSeconds != nil {
recreateTimeout = time.Duration(*rollingParams.TimeoutSeconds) * time.Second
}
if updateAcceptor == nil {
updateAcceptor = s.getUpdateAcceptor(recreateTimeout, config.Spec.MinReadySeconds)
}
// Execute any pre-hook.
if params != nil && params.Pre != nil {
if err := s.hookExecutor.Execute(params.Pre, to, appsapi.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, recreateTimeout)
if err != nil {
return fmt.Errorf("couldn't scale %s to 0: %v", from.Name, err)
}
// Wait for pods to terminate.
s.waitForTerminatedPods(from, time.Duration(*params.TimeoutSeconds)*time.Second)
}
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, appsapi.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, recreateTimeout)
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, recreateTimeout)
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, appsapi.PostHookPodSuffix, "post"); err != nil {
return fmt.Errorf("post hook failed: %s", err)
}
}
return nil
}
func (s *RecreateDeploymentStrategy) scaleAndWait(deployment *kapi.ReplicationController, replicas int, retryTimeout time.Duration) (*kapi.ReplicationController, error) {
if int32(replicas) == deployment.Spec.Replicas && int32(replicas) == deployment.Status.Replicas {
return deployment, nil
}
alreadyScaled := false
// Scale the replication controller.
// In case the cache is not fully synced, retry the scaling.
err := wait.PollImmediate(1*time.Second, retryTimeout, func() (bool, error) {
updateScaleErr := retry.RetryOnConflict(retry.DefaultRetry, func() error {
curScale, err := s.scaleClient.Scales(deployment.Namespace).Get(kapi.Resource("replicationcontrollers"), deployment.Name)
if err != nil {
return err
}
if curScale.Status.Replicas == int32(replicas) {
alreadyScaled = true
return nil
}
curScaleCopy := curScale.DeepCopy()
curScaleCopy.Spec.Replicas = int32(replicas)
_, scaleErr := s.scaleClient.Scales(deployment.Namespace).Update(kapi.Resource("replicationcontrollers"), curScaleCopy)
return scaleErr
})
// FIXME: The error admission returns here should be 503 (come back later) or similar.
if errors.IsForbidden(updateScaleErr) && strings.Contains(updateScaleErr.Error(), "not yet ready to handle request") {
return false, nil
}
return true, updateScaleErr
})
if err != nil {
return nil, err
}
// Wait for the scale to take effect.
if !alreadyScaled {
// FIXME: This should really be a watch, however the scaler client does not implement the watch interface atm.
err = wait.PollImmediate(1*time.Second, retryTimeout, func() (bool, error) {
curScale, err := s.scaleClient.Scales(deployment.Namespace).Get(kapi.Resource("replicationcontrollers"), deployment.Name)
if err != nil {
return false, err
}
return curScale.Status.Replicas == int32(replicas), nil
})
}
return s.rcClient.ReplicationControllers(deployment.Namespace).Get(deployment.Name, metav1.GetOptions{})
}
// waitForTerminatedPods waits until all pods for the provided replication controller are terminated.
func (s *RecreateDeploymentStrategy) waitForTerminatedPods(from *kapi.ReplicationController, timeout time.Duration) {
selector := labels.SelectorFromValidatedSet(labels.Set(from.Spec.Selector))
options := metav1.ListOptions{LabelSelector: selector.String()}
podList, err := s.podClient.Pods(from.Namespace).List(options)
if err != nil {
fmt.Fprintf(s.out, "--> Cannot list pods: %v\nNew pods may be scaled up before old pods terminate\n", err)
return
}
// If there are no pods left, we are done.
if len(podList.Items) == 0 {
return
}
// Watch from the resource version of the list and wait for all pods to be deleted
// before proceeding with the Recreate strategy.
options.ResourceVersion = podList.ResourceVersion
w, err := s.podClient.Pods(from.Namespace).Watch(options)
if err != nil {
fmt.Fprintf(s.out, "--> Watch could not be established: %v\nNew pods may be scaled up before old pods terminate\n", err)
return
}
defer w.Stop()
// Observe as many deletions as the remaining pods and then return.
deletionsNeeded := len(podList.Items)
condition := func(event watch.Event) (bool, error) {
if event.Type == watch.Deleted {
deletionsNeeded--
}
return deletionsNeeded == 0, nil
}
// TODO: Timeout should be timeout - (time.Now - deployerPodStartTime)
if _, err = watch.Until(timeout, w, condition); err != nil && err != wait.ErrWaitTimeout {
fmt.Fprintf(s.out, "--> Watch failed: %v\nNew pods may be scaled up before old pods terminate\n", err)
}
}