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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package deployment
import (
"bytes"
"fmt"
"sort"
"time"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
clientv1 "k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/flowcontrol"
"k8s.io/client-go/util/workqueue"
fed "k8s.io/kubernetes/federation/apis/federation"
fedv1 "k8s.io/kubernetes/federation/apis/federation/v1beta1"
fedclientset "k8s.io/kubernetes/federation/client/clientset_generated/federation_clientset"
fedutil "k8s.io/kubernetes/federation/pkg/federation-controller/util"
"k8s.io/kubernetes/federation/pkg/federation-controller/util/deletionhelper"
"k8s.io/kubernetes/federation/pkg/federation-controller/util/eventsink"
"k8s.io/kubernetes/federation/pkg/federation-controller/util/planner"
"k8s.io/kubernetes/federation/pkg/federation-controller/util/podanalyzer"
"k8s.io/kubernetes/federation/pkg/federation-controller/util/replicapreferences"
"k8s.io/kubernetes/pkg/api"
apiv1 "k8s.io/kubernetes/pkg/api/v1"
extensionsv1 "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
kubeclientset "k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
"k8s.io/kubernetes/pkg/controller"
)
const (
FedDeploymentPreferencesAnnotation = "federation.kubernetes.io/deployment-preferences"
allClustersKey = "THE_ALL_CLUSTER_KEY"
UserAgentName = "federation-deployment-controller"
ControllerName = "deployments"
)
var (
RequiredResources = []schema.GroupVersionResource{extensionsv1.SchemeGroupVersion.WithResource("deployments")}
deploymentReviewDelay = 10 * time.Second
clusterAvailableDelay = 20 * time.Second
clusterUnavailableDelay = 60 * time.Second
allDeploymentReviewDelay = 2 * time.Minute
updateTimeout = 30 * time.Second
)
type DeploymentController struct {
fedClient fedclientset.Interface
deploymentController cache.Controller
deploymentStore cache.Store
fedDeploymentInformer fedutil.FederatedInformer
fedPodInformer fedutil.FederatedInformer
deploymentDeliverer *fedutil.DelayingDeliverer
clusterDeliverer *fedutil.DelayingDeliverer
deploymentWorkQueue workqueue.Interface
// For updating members of federation.
fedUpdater fedutil.FederatedUpdater
deploymentBackoff *flowcontrol.Backoff
eventRecorder record.EventRecorder
deletionHelper *deletionhelper.DeletionHelper
defaultPlanner *planner.Planner
}
// NewDeploymentController returns a new deployment controller
func NewDeploymentController(federationClient fedclientset.Interface) *DeploymentController {
broadcaster := record.NewBroadcaster()
broadcaster.StartRecordingToSink(eventsink.NewFederatedEventSink(federationClient))
recorder := broadcaster.NewRecorder(api.Scheme, clientv1.EventSource{Component: UserAgentName})
fdc := &DeploymentController{
fedClient: federationClient,
deploymentDeliverer: fedutil.NewDelayingDeliverer(),
clusterDeliverer: fedutil.NewDelayingDeliverer(),
deploymentWorkQueue: workqueue.New(),
deploymentBackoff: flowcontrol.NewBackOff(5*time.Second, time.Minute),
defaultPlanner: planner.NewPlanner(&fed.ReplicaAllocationPreferences{
Clusters: map[string]fed.ClusterPreferences{
"*": {Weight: 1},
},
}),
eventRecorder: recorder,
}
deploymentFedInformerFactory := func(cluster *fedv1.Cluster, clientset kubeclientset.Interface) (cache.Store, cache.Controller) {
return cache.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return clientset.Extensions().Deployments(metav1.NamespaceAll).List(options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return clientset.Extensions().Deployments(metav1.NamespaceAll).Watch(options)
},
},
&extensionsv1.Deployment{},
controller.NoResyncPeriodFunc(),
fedutil.NewTriggerOnAllChanges(
func(obj runtime.Object) { fdc.deliverLocalDeployment(obj, deploymentReviewDelay) },
),
)
}
clusterLifecycle := fedutil.ClusterLifecycleHandlerFuncs{
ClusterAvailable: func(cluster *fedv1.Cluster) {
fdc.clusterDeliverer.DeliverAfter(allClustersKey, nil, clusterAvailableDelay)
},
ClusterUnavailable: func(cluster *fedv1.Cluster, _ []interface{}) {
fdc.clusterDeliverer.DeliverAfter(allClustersKey, nil, clusterUnavailableDelay)
},
}
fdc.fedDeploymentInformer = fedutil.NewFederatedInformer(federationClient, deploymentFedInformerFactory, &clusterLifecycle)
podFedInformerFactory := func(cluster *fedv1.Cluster, clientset kubeclientset.Interface) (cache.Store, cache.Controller) {
return cache.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return clientset.Core().Pods(metav1.NamespaceAll).List(options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return clientset.Core().Pods(metav1.NamespaceAll).Watch(options)
},
},
&apiv1.Pod{},
controller.NoResyncPeriodFunc(),
fedutil.NewTriggerOnAllChanges(
func(obj runtime.Object) {
fdc.clusterDeliverer.DeliverAfter(allClustersKey, nil, allDeploymentReviewDelay)
},
),
)
}
fdc.fedPodInformer = fedutil.NewFederatedInformer(federationClient, podFedInformerFactory, &fedutil.ClusterLifecycleHandlerFuncs{})
fdc.deploymentStore, fdc.deploymentController = cache.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return fdc.fedClient.Extensions().Deployments(metav1.NamespaceAll).List(options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return fdc.fedClient.Extensions().Deployments(metav1.NamespaceAll).Watch(options)
},
},
&extensionsv1.Deployment{},
controller.NoResyncPeriodFunc(),
fedutil.NewTriggerOnMetaAndSpecChanges(
func(obj runtime.Object) { fdc.deliverFedDeploymentObj(obj, deploymentReviewDelay) },
),
)
fdc.fedUpdater = fedutil.NewFederatedUpdater(fdc.fedDeploymentInformer, "deployment", updateTimeout, fdc.eventRecorder,
func(client kubeclientset.Interface, obj runtime.Object) error {
rs := obj.(*extensionsv1.Deployment)
_, err := client.Extensions().Deployments(rs.Namespace).Create(rs)
return err
},
func(client kubeclientset.Interface, obj runtime.Object) error {
rs := obj.(*extensionsv1.Deployment)
_, err := client.Extensions().Deployments(rs.Namespace).Update(rs)
return err
},
func(client kubeclientset.Interface, obj runtime.Object) error {
rs := obj.(*extensionsv1.Deployment)
orphanDependents := false
err := client.Extensions().Deployments(rs.Namespace).Delete(rs.Name, &metav1.DeleteOptions{OrphanDependents: &orphanDependents})
return err
})
fdc.deletionHelper = deletionhelper.NewDeletionHelper(
fdc.updateDeployment,
// objNameFunc
func(obj runtime.Object) string {
deployment := obj.(*extensionsv1.Deployment)
return fmt.Sprintf("%s/%s", deployment.Namespace, deployment.Name)
},
fdc.fedDeploymentInformer,
fdc.fedUpdater,
)
return fdc
}
// Sends the given updated object to apiserver.
// Assumes that the given object is a deployment.
func (fdc *DeploymentController) updateDeployment(obj runtime.Object) (runtime.Object, error) {
deployment := obj.(*extensionsv1.Deployment)
return fdc.fedClient.Extensions().Deployments(deployment.Namespace).Update(deployment)
}
func (fdc *DeploymentController) Run(workers int, stopCh <-chan struct{}) {
go fdc.deploymentController.Run(stopCh)
fdc.fedDeploymentInformer.Start()
fdc.fedPodInformer.Start()
fdc.deploymentDeliverer.StartWithHandler(func(item *fedutil.DelayingDelivererItem) {
fdc.deploymentWorkQueue.Add(item.Key)
})
fdc.clusterDeliverer.StartWithHandler(func(_ *fedutil.DelayingDelivererItem) {
fdc.reconcileDeploymentsOnClusterChange()
})
// Wait until the cluster is synced to prevent the update storm at the very beginning.
for !fdc.isSynced() {
time.Sleep(5 * time.Millisecond)
glog.V(3).Infof("Waiting for controller to sync up")
}
for i := 0; i < workers; i++ {
go wait.Until(fdc.worker, time.Second, stopCh)
}
fedutil.StartBackoffGC(fdc.deploymentBackoff, stopCh)
<-stopCh
glog.Infof("Shutting down DeploymentController")
fdc.deploymentDeliverer.Stop()
fdc.clusterDeliverer.Stop()
fdc.deploymentWorkQueue.ShutDown()
fdc.fedDeploymentInformer.Stop()
fdc.fedPodInformer.Stop()
}
func (fdc *DeploymentController) isSynced() bool {
if !fdc.fedDeploymentInformer.ClustersSynced() {
glog.V(2).Infof("Cluster list not synced")
return false
}
clustersFromDeps, err := fdc.fedDeploymentInformer.GetReadyClusters()
if err != nil {
glog.Errorf("Failed to get ready clusters: %v", err)
return false
}
if !fdc.fedDeploymentInformer.GetTargetStore().ClustersSynced(clustersFromDeps) {
return false
}
if !fdc.fedPodInformer.ClustersSynced() {
glog.V(2).Infof("Cluster list not synced")
return false
}
clustersFromPods, err := fdc.fedPodInformer.GetReadyClusters()
if err != nil {
glog.Errorf("Failed to get ready clusters: %v", err)
return false
}
// This also checks whether podInformer and deploymentInformer have the
// same cluster lists.
if !fdc.fedPodInformer.GetTargetStore().ClustersSynced(clustersFromDeps) {
glog.V(2).Infof("Pod informer not synced")
return false
}
if !fdc.fedPodInformer.GetTargetStore().ClustersSynced(clustersFromPods) {
glog.V(2).Infof("Pod informer not synced")
return false
}
if !fdc.deploymentController.HasSynced() {
glog.V(2).Infof("federation deployment list not synced")
return false
}
return true
}
func (fdc *DeploymentController) deliverLocalDeployment(obj interface{}, duration time.Duration) {
key, err := controller.KeyFunc(obj)
if err != nil {
glog.Errorf("Couldn't get key for object %v: %v", obj, err)
return
}
_, exists, err := fdc.deploymentStore.GetByKey(key)
if err != nil {
glog.Errorf("Couldn't get federation deployment %v: %v", key, err)
return
}
if exists { // ignore deployments exists only in local k8s
fdc.deliverDeploymentByKey(key, duration, false)
}
}
func (fdc *DeploymentController) deliverFedDeploymentObj(obj interface{}, delay time.Duration) {
key, err := controller.KeyFunc(obj)
if err != nil {
glog.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
fdc.deliverDeploymentByKey(key, delay, false)
}
func (fdc *DeploymentController) deliverDeploymentByKey(key string, delay time.Duration, failed bool) {
if failed {
fdc.deploymentBackoff.Next(key, time.Now())
delay = delay + fdc.deploymentBackoff.Get(key)
} else {
fdc.deploymentBackoff.Reset(key)
}
fdc.deploymentDeliverer.DeliverAfter(key, nil, delay)
}
func (fdc *DeploymentController) worker() {
for {
item, quit := fdc.deploymentWorkQueue.Get()
if quit {
return
}
key := item.(string)
status, err := fdc.reconcileDeployment(key)
fdc.deploymentWorkQueue.Done(item)
if err != nil {
glog.Errorf("Error syncing cluster controller: %v", err)
fdc.deliverDeploymentByKey(key, 0, true)
} else {
switch status {
case statusAllOk:
break
case statusError:
fdc.deliverDeploymentByKey(key, 0, true)
case statusNeedRecheck:
fdc.deliverDeploymentByKey(key, deploymentReviewDelay, false)
case statusNotSynced:
fdc.deliverDeploymentByKey(key, clusterAvailableDelay, false)
default:
glog.Errorf("Unhandled reconciliation status: %s", status)
fdc.deliverDeploymentByKey(key, deploymentReviewDelay, false)
}
}
}
}
func (fdc *DeploymentController) schedule(fd *extensionsv1.Deployment, clusters []*fedv1.Cluster,
current map[string]int64, estimatedCapacity map[string]int64) map[string]int64 {
// TODO: integrate real scheduler
plannerToBeUsed := fdc.defaultPlanner
fdPref, err := replicapreferences.GetAllocationPreferences(fd, FedDeploymentPreferencesAnnotation)
if err != nil {
glog.Info("Invalid Deployment specific preference, use default. deployment: %v, err: %v", fd.Name, err)
}
if fdPref != nil { // create a new planner if user specified a preference
plannerToBeUsed = planner.NewPlanner(fdPref)
}
replicas := int64(0)
if fd.Spec.Replicas != nil {
replicas = int64(*fd.Spec.Replicas)
}
var clusterNames []string
for _, cluster := range clusters {
clusterNames = append(clusterNames, cluster.Name)
}
scheduleResult, overflow := plannerToBeUsed.Plan(replicas, clusterNames, current, estimatedCapacity,
fd.Namespace+"/"+fd.Name)
// make sure the result contains all clusters that currently have some replicas.
result := make(map[string]int64)
for clusterName := range current {
result[clusterName] = 0
}
for clusterName, replicas := range scheduleResult {
result[clusterName] = replicas
}
for clusterName, replicas := range overflow {
result[clusterName] += replicas
}
if glog.V(4) {
buf := bytes.NewBufferString(fmt.Sprintf("Schedule - Deployment: %s/%s\n", fd.Namespace, fd.Name))
sort.Strings(clusterNames)
for _, clusterName := range clusterNames {
cur := current[clusterName]
target := scheduleResult[clusterName]
fmt.Fprintf(buf, "%s: current: %d target: %d", clusterName, cur, target)
if over, found := overflow[clusterName]; found {
fmt.Fprintf(buf, " overflow: %d", over)
}
if capacity, found := estimatedCapacity[clusterName]; found {
fmt.Fprintf(buf, " capacity: %d", capacity)
}
fmt.Fprintf(buf, "\n")
}
glog.V(4).Infof(buf.String())
}
return result
}
type reconciliationStatus string
const (
statusAllOk = reconciliationStatus("ALL_OK")
statusNeedRecheck = reconciliationStatus("RECHECK")
statusError = reconciliationStatus("ERROR")
statusNotSynced = reconciliationStatus("NOSYNC")
)
func (fdc *DeploymentController) reconcileDeployment(key string) (reconciliationStatus, error) {
if !fdc.isSynced() {
return statusNotSynced, nil
}
glog.V(4).Infof("Start reconcile deployment %q", key)
startTime := time.Now()
defer glog.V(4).Infof("Finished reconcile deployment %q (%v)", key, time.Now().Sub(startTime))
objFromStore, exists, err := fdc.deploymentStore.GetByKey(key)
if err != nil {
return statusError, err
}
if !exists {
// don't delete local deployments for now. Do not reconcile it anymore.
return statusAllOk, nil
}
obj, err := api.Scheme.DeepCopy(objFromStore)
fd, ok := obj.(*extensionsv1.Deployment)
if err != nil || !ok {
glog.Errorf("Error in retrieving obj from store: %v, %v", ok, err)
return statusError, err
}
if fd.DeletionTimestamp != nil {
if err := fdc.delete(fd); err != nil {
glog.Errorf("Failed to delete %s: %v", fd.Name, err)
fdc.eventRecorder.Eventf(fd, api.EventTypeWarning, "DeleteFailed",
"Deployment delete failed: %v", err)
return statusError, err
}
return statusAllOk, nil
}
glog.V(3).Infof("Ensuring delete object from underlying clusters finalizer for deployment: %s",
fd.Name)
// Add the required finalizers before creating a deployment in underlying clusters.
updatedDeploymentObj, err := fdc.deletionHelper.EnsureFinalizers(fd)
if err != nil {
glog.Errorf("Failed to ensure delete object from underlying clusters finalizer in deployment %s: %v",
fd.Name, err)
return statusError, err
}
fd = updatedDeploymentObj.(*extensionsv1.Deployment)
glog.V(3).Infof("Syncing deployment %s in underlying clusters", fd.Name)
clusters, err := fdc.fedDeploymentInformer.GetReadyClusters()
if err != nil {
return statusError, err
}
// collect current status and do schedule
allPods, err := fdc.fedPodInformer.GetTargetStore().List()
if err != nil {
return statusError, err
}
podStatus, err := podanalyzer.AnalysePods(fd.Spec.Selector, allPods, time.Now())
if err != nil {
return statusError, err
}
current := make(map[string]int64)
estimatedCapacity := make(map[string]int64)
for _, cluster := range clusters {
ldObj, exists, err := fdc.fedDeploymentInformer.GetTargetStore().GetByKey(cluster.Name, key)
if err != nil {
return statusError, err
}
if exists {
ld := ldObj.(*extensionsv1.Deployment)
current[cluster.Name] = int64(podStatus[cluster.Name].RunningAndReady) // include pending as well?
unschedulable := int64(podStatus[cluster.Name].Unschedulable)
if unschedulable > 0 {
estimatedCapacity[cluster.Name] = int64(*ld.Spec.Replicas) - unschedulable
}
}
}
scheduleResult := fdc.schedule(fd, clusters, current, estimatedCapacity)
glog.V(4).Infof("Start syncing local deployment %s: %v", key, scheduleResult)
fedStatus := extensionsv1.DeploymentStatus{ObservedGeneration: fd.Generation}
operations := make([]fedutil.FederatedOperation, 0)
for clusterName, replicas := range scheduleResult {
ldObj, exists, err := fdc.fedDeploymentInformer.GetTargetStore().GetByKey(clusterName, key)
if err != nil {
return statusError, err
}
// The object can be modified.
ld := fedutil.DeepCopyDeployment(fd)
specReplicas := int32(replicas)
ld.Spec.Replicas = &specReplicas
if !exists {
if replicas > 0 {
operations = append(operations, fedutil.FederatedOperation{
Type: fedutil.OperationTypeAdd,
Obj: ld,
ClusterName: clusterName,
Key: key,
})
}
} else {
// TODO: Update only one deployment at a time if update strategy is rolling update.
currentLd := ldObj.(*extensionsv1.Deployment)
// Update existing replica set, if needed.
if !fedutil.DeploymentEquivalent(ld, currentLd) {
operations = append(operations, fedutil.FederatedOperation{
Type: fedutil.OperationTypeUpdate,
Obj: ld,
ClusterName: clusterName,
Key: key,
})
glog.Infof("Updating %s in %s", currentLd.Name, clusterName)
}
fedStatus.Replicas += currentLd.Status.Replicas
fedStatus.AvailableReplicas += currentLd.Status.AvailableReplicas
fedStatus.UnavailableReplicas += currentLd.Status.UnavailableReplicas
fedStatus.ReadyReplicas += currentLd.Status.ReadyReplicas
}
}
if fedStatus.Replicas != fd.Status.Replicas ||
fedStatus.AvailableReplicas != fd.Status.AvailableReplicas ||
fedStatus.UnavailableReplicas != fd.Status.UnavailableReplicas ||
fedStatus.ReadyReplicas != fd.Status.ReadyReplicas {
fd.Status = fedStatus
_, err = fdc.fedClient.Extensions().Deployments(fd.Namespace).UpdateStatus(fd)
if err != nil {
return statusError, err
}
}
if len(operations) == 0 {
// Everything is in order
return statusAllOk, nil
}
err = fdc.fedUpdater.Update(operations)
if err != nil {
glog.Errorf("Failed to execute updates for %s: %v", key, err)
return statusError, err
}
// Some operations were made, reconcile after a while.
return statusNeedRecheck, nil
}
func (fdc *DeploymentController) reconcileDeploymentsOnClusterChange() {
if !fdc.isSynced() {
fdc.clusterDeliverer.DeliverAfter(allClustersKey, nil, clusterAvailableDelay)
}
deps := fdc.deploymentStore.List()
for _, dep := range deps {
key, _ := controller.KeyFunc(dep)
fdc.deliverDeploymentByKey(key, 0, false)
}
}
// delete deletes the given deployment or returns error if the deletion was not complete.
func (fdc *DeploymentController) delete(deployment *extensionsv1.Deployment) error {
glog.V(3).Infof("Handling deletion of deployment: %v", *deployment)
_, err := fdc.deletionHelper.HandleObjectInUnderlyingClusters(deployment)
if err != nil {
return err
}
err = fdc.fedClient.Extensions().Deployments(deployment.Namespace).Delete(deployment.Name, nil)
if err != nil {
// Its all good if the error is not found error. That means it is deleted already and we do not have to do anything.
// This is expected when we are processing an update as a result of deployment finalizer deletion.
// The process that deleted the last finalizer is also going to delete the deployment and we do not have to do anything.
if !errors.IsNotFound(err) {
return fmt.Errorf("failed to delete deployment: %v", err)
}
}
return nil
}
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