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daemon_controller.go
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daemon_controller.go
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/*
Copyright 2015 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 daemon
import (
"fmt"
"reflect"
"sort"
"sync"
"time"
"github.com/golang/glog"
apps "k8s.io/api/apps/v1"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/wait"
utilfeature "k8s.io/apiserver/pkg/util/feature"
appsinformers "k8s.io/client-go/informers/apps/v1"
coreinformers "k8s.io/client-go/informers/core/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
unversionedapps "k8s.io/client-go/kubernetes/typed/apps/v1"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
appslisters "k8s.io/client-go/listers/apps/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/integer"
"k8s.io/client-go/util/workqueue"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/daemon/util"
"k8s.io/kubernetes/pkg/features"
kubelettypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/scheduler/algorithm"
"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
schedulercache "k8s.io/kubernetes/pkg/scheduler/cache"
"k8s.io/kubernetes/pkg/util/metrics"
)
const (
// BurstReplicas is a rate limiter for booting pods on a lot of pods.
// The value of 250 is chosen b/c values that are too high can cause registry DoS issues.
BurstReplicas = 250
// StatusUpdateRetries limits the number of retries if sending a status update to API server fails.
StatusUpdateRetries = 1
)
// Reasons for DaemonSet events
const (
// SelectingAllReason is added to an event when a DaemonSet selects all Pods.
SelectingAllReason = "SelectingAll"
// FailedPlacementReason is added to an event when a DaemonSet can't schedule a Pod to a specified node.
FailedPlacementReason = "FailedPlacement"
// FailedDaemonPodReason is added to an event when the status of a Pod of a DaemonSet is 'Failed'.
FailedDaemonPodReason = "FailedDaemonPod"
)
// controllerKind contains the schema.GroupVersionKind for this controller type.
var controllerKind = apps.SchemeGroupVersion.WithKind("DaemonSet")
// DaemonSetsController is responsible for synchronizing DaemonSet objects stored
// in the system with actual running pods.
type DaemonSetsController struct {
kubeClient clientset.Interface
eventRecorder record.EventRecorder
podControl controller.PodControlInterface
crControl controller.ControllerRevisionControlInterface
// An dsc is temporarily suspended after creating/deleting these many replicas.
// It resumes normal action after observing the watch events for them.
burstReplicas int
// To allow injection of syncDaemonSet for testing.
syncHandler func(dsKey string) error
// used for unit testing
enqueueDaemonSet func(ds *apps.DaemonSet)
enqueueDaemonSetRateLimited func(ds *apps.DaemonSet)
// A TTLCache of pod creates/deletes each ds expects to see
expectations controller.ControllerExpectationsInterface
// dsLister can list/get daemonsets from the shared informer's store
dsLister appslisters.DaemonSetLister
// dsStoreSynced returns true if the daemonset store has been synced at least once.
// Added as a member to the struct to allow injection for testing.
dsStoreSynced cache.InformerSynced
// historyLister get list/get history from the shared informers's store
historyLister appslisters.ControllerRevisionLister
// historyStoreSynced returns true if the history store has been synced at least once.
// Added as a member to the struct to allow injection for testing.
historyStoreSynced cache.InformerSynced
// podLister get list/get pods from the shared informers's store
podLister corelisters.PodLister
// podStoreSynced returns true if the pod store has been synced at least once.
// Added as a member to the struct to allow injection for testing.
podStoreSynced cache.InformerSynced
// nodeLister can list/get nodes from the shared informer's store
nodeLister corelisters.NodeLister
// nodeStoreSynced returns true if the node store has been synced at least once.
// Added as a member to the struct to allow injection for testing.
nodeStoreSynced cache.InformerSynced
// DaemonSet keys that need to be synced.
queue workqueue.RateLimitingInterface
// The DaemonSet that has suspended pods on nodes; the key is node name, the value
// is DaemonSet set that want to run pods but can't schedule in latest syncup cycle.
suspendedDaemonPodsMutex sync.Mutex
suspendedDaemonPods map[string]sets.String
}
// NewDaemonSetsController creates a new DaemonSetsController
func NewDaemonSetsController(daemonSetInformer appsinformers.DaemonSetInformer, historyInformer appsinformers.ControllerRevisionInformer, podInformer coreinformers.PodInformer, nodeInformer coreinformers.NodeInformer, kubeClient clientset.Interface) (*DaemonSetsController, error) {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
if kubeClient != nil && kubeClient.CoreV1().RESTClient().GetRateLimiter() != nil {
if err := metrics.RegisterMetricAndTrackRateLimiterUsage("daemon_controller", kubeClient.CoreV1().RESTClient().GetRateLimiter()); err != nil {
return nil, err
}
}
dsc := &DaemonSetsController{
kubeClient: kubeClient,
eventRecorder: eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "daemonset-controller"}),
podControl: controller.RealPodControl{
KubeClient: kubeClient,
Recorder: eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "daemonset-controller"}),
},
crControl: controller.RealControllerRevisionControl{
KubeClient: kubeClient,
},
burstReplicas: BurstReplicas,
expectations: controller.NewControllerExpectations(),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "daemonset"),
suspendedDaemonPods: map[string]sets.String{},
}
daemonSetInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
ds := obj.(*apps.DaemonSet)
glog.V(4).Infof("Adding daemon set %s", ds.Name)
dsc.enqueueDaemonSet(ds)
},
UpdateFunc: func(old, cur interface{}) {
oldDS := old.(*apps.DaemonSet)
curDS := cur.(*apps.DaemonSet)
glog.V(4).Infof("Updating daemon set %s", oldDS.Name)
dsc.enqueueDaemonSet(curDS)
},
DeleteFunc: dsc.deleteDaemonset,
})
dsc.dsLister = daemonSetInformer.Lister()
dsc.dsStoreSynced = daemonSetInformer.Informer().HasSynced
historyInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: dsc.addHistory,
UpdateFunc: dsc.updateHistory,
DeleteFunc: dsc.deleteHistory,
})
dsc.historyLister = historyInformer.Lister()
dsc.historyStoreSynced = historyInformer.Informer().HasSynced
// Watch for creation/deletion of pods. The reason we watch is that we don't want a daemon set to create/delete
// more pods until all the effects (expectations) of a daemon set's create/delete have been observed.
podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: dsc.addPod,
UpdateFunc: dsc.updatePod,
DeleteFunc: dsc.deletePod,
})
dsc.podLister = podInformer.Lister()
dsc.podStoreSynced = podInformer.Informer().HasSynced
nodeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: dsc.addNode,
UpdateFunc: dsc.updateNode,
},
)
dsc.nodeStoreSynced = nodeInformer.Informer().HasSynced
dsc.nodeLister = nodeInformer.Lister()
dsc.syncHandler = dsc.syncDaemonSet
dsc.enqueueDaemonSet = dsc.enqueue
dsc.enqueueDaemonSetRateLimited = dsc.enqueueRateLimited
return dsc, nil
}
func (dsc *DaemonSetsController) deleteDaemonset(obj interface{}) {
ds, ok := obj.(*apps.DaemonSet)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
utilruntime.HandleError(fmt.Errorf("Couldn't get object from tombstone %#v", obj))
return
}
ds, ok = tombstone.Obj.(*apps.DaemonSet)
if !ok {
utilruntime.HandleError(fmt.Errorf("Tombstone contained object that is not a DaemonSet %#v", obj))
return
}
}
glog.V(4).Infof("Deleting daemon set %s", ds.Name)
dsc.enqueueDaemonSet(ds)
}
// Run begins watching and syncing daemon sets.
func (dsc *DaemonSetsController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer dsc.queue.ShutDown()
glog.Infof("Starting daemon sets controller")
defer glog.Infof("Shutting down daemon sets controller")
if !controller.WaitForCacheSync("daemon sets", stopCh, dsc.podStoreSynced, dsc.nodeStoreSynced, dsc.historyStoreSynced, dsc.dsStoreSynced) {
return
}
for i := 0; i < workers; i++ {
go wait.Until(dsc.runWorker, time.Second, stopCh)
}
<-stopCh
}
func (dsc *DaemonSetsController) runWorker() {
for dsc.processNextWorkItem() {
}
}
// processNextWorkItem deals with one key off the queue. It returns false when it's time to quit.
func (dsc *DaemonSetsController) processNextWorkItem() bool {
dsKey, quit := dsc.queue.Get()
if quit {
return false
}
defer dsc.queue.Done(dsKey)
err := dsc.syncHandler(dsKey.(string))
if err == nil {
dsc.queue.Forget(dsKey)
return true
}
utilruntime.HandleError(fmt.Errorf("%v failed with : %v", dsKey, err))
dsc.queue.AddRateLimited(dsKey)
return true
}
func (dsc *DaemonSetsController) enqueue(ds *apps.DaemonSet) {
key, err := controller.KeyFunc(ds)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %#v: %v", ds, err))
return
}
// TODO: Handle overlapping controllers better. See comment in ReplicationManager.
dsc.queue.Add(key)
}
func (dsc *DaemonSetsController) enqueueRateLimited(ds *apps.DaemonSet) {
key, err := controller.KeyFunc(ds)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %#v: %v", ds, err))
return
}
dsc.queue.AddRateLimited(key)
}
func (dsc *DaemonSetsController) enqueueDaemonSetAfter(obj interface{}, after time.Duration) {
key, err := controller.KeyFunc(obj)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %+v: %v", obj, err))
return
}
// TODO: Handle overlapping controllers better. See comment in ReplicationManager.
dsc.queue.AddAfter(key, after)
}
// getDaemonSetsForPod returns a list of DaemonSets that potentially match the pod.
func (dsc *DaemonSetsController) getDaemonSetsForPod(pod *v1.Pod) []*apps.DaemonSet {
sets, err := dsc.dsLister.GetPodDaemonSets(pod)
if err != nil {
return nil
}
if len(sets) > 1 {
// ControllerRef will ensure we don't do anything crazy, but more than one
// item in this list nevertheless constitutes user error.
utilruntime.HandleError(fmt.Errorf("user error! more than one daemon is selecting pods with labels: %+v", pod.Labels))
}
return sets
}
// getDaemonSetsForHistory returns a list of DaemonSets that potentially
// match a ControllerRevision.
func (dsc *DaemonSetsController) getDaemonSetsForHistory(history *apps.ControllerRevision) []*apps.DaemonSet {
daemonSets, err := dsc.dsLister.GetHistoryDaemonSets(history)
if err != nil || len(daemonSets) == 0 {
return nil
}
if len(daemonSets) > 1 {
// ControllerRef will ensure we don't do anything crazy, but more than one
// item in this list nevertheless constitutes user error.
glog.V(4).Infof("User error! more than one DaemonSets is selecting ControllerRevision %s/%s with labels: %#v",
history.Namespace, history.Name, history.Labels)
}
return daemonSets
}
// addHistory enqueues the DaemonSet that manages a ControllerRevision when the ControllerRevision is created
// or when the controller manager is restarted.
func (dsc *DaemonSetsController) addHistory(obj interface{}) {
history := obj.(*apps.ControllerRevision)
if history.DeletionTimestamp != nil {
// On a restart of the controller manager, it's possible for an object to
// show up in a state that is already pending deletion.
dsc.deleteHistory(history)
return
}
// If it has a ControllerRef, that's all that matters.
if controllerRef := metav1.GetControllerOf(history); controllerRef != nil {
ds := dsc.resolveControllerRef(history.Namespace, controllerRef)
if ds == nil {
return
}
glog.V(4).Infof("ControllerRevision %s added.", history.Name)
return
}
// Otherwise, it's an orphan. Get a list of all matching DaemonSets and sync
// them to see if anyone wants to adopt it.
daemonSets := dsc.getDaemonSetsForHistory(history)
if len(daemonSets) == 0 {
return
}
glog.V(4).Infof("Orphan ControllerRevision %s added.", history.Name)
for _, ds := range daemonSets {
dsc.enqueueDaemonSet(ds)
}
}
// updateHistory figures out what DaemonSet(s) manage a ControllerRevision when the ControllerRevision
// is updated and wake them up. If anything of the ControllerRevision has changed, we need to awaken
// both the old and new DaemonSets.
func (dsc *DaemonSetsController) updateHistory(old, cur interface{}) {
curHistory := cur.(*apps.ControllerRevision)
oldHistory := old.(*apps.ControllerRevision)
if curHistory.ResourceVersion == oldHistory.ResourceVersion {
// Periodic resync will send update events for all known ControllerRevisions.
return
}
curControllerRef := metav1.GetControllerOf(curHistory)
oldControllerRef := metav1.GetControllerOf(oldHistory)
controllerRefChanged := !reflect.DeepEqual(curControllerRef, oldControllerRef)
if controllerRefChanged && oldControllerRef != nil {
// The ControllerRef was changed. Sync the old controller, if any.
if ds := dsc.resolveControllerRef(oldHistory.Namespace, oldControllerRef); ds != nil {
dsc.enqueueDaemonSet(ds)
}
}
// If it has a ControllerRef, that's all that matters.
if curControllerRef != nil {
ds := dsc.resolveControllerRef(curHistory.Namespace, curControllerRef)
if ds == nil {
return
}
glog.V(4).Infof("ControllerRevision %s updated.", curHistory.Name)
dsc.enqueueDaemonSet(ds)
return
}
// Otherwise, it's an orphan. If anything changed, sync matching controllers
// to see if anyone wants to adopt it now.
labelChanged := !reflect.DeepEqual(curHistory.Labels, oldHistory.Labels)
if labelChanged || controllerRefChanged {
daemonSets := dsc.getDaemonSetsForHistory(curHistory)
if len(daemonSets) == 0 {
return
}
glog.V(4).Infof("Orphan ControllerRevision %s updated.", curHistory.Name)
for _, ds := range daemonSets {
dsc.enqueueDaemonSet(ds)
}
}
}
// deleteHistory enqueues the DaemonSet that manages a ControllerRevision when
// the ControllerRevision is deleted. obj could be an *app.ControllerRevision, or
// a DeletionFinalStateUnknown marker item.
func (dsc *DaemonSetsController) deleteHistory(obj interface{}) {
history, ok := obj.(*apps.ControllerRevision)
// When a delete is dropped, the relist will notice a ControllerRevision in the store not
// in the list, leading to the insertion of a tombstone object which contains
// the deleted key/value. Note that this value might be stale. If the ControllerRevision
// changed labels the new DaemonSet will not be woken up till the periodic resync.
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
utilruntime.HandleError(fmt.Errorf("Couldn't get object from tombstone %#v", obj))
return
}
history, ok = tombstone.Obj.(*apps.ControllerRevision)
if !ok {
utilruntime.HandleError(fmt.Errorf("Tombstone contained object that is not a ControllerRevision %#v", obj))
return
}
}
controllerRef := metav1.GetControllerOf(history)
if controllerRef == nil {
// No controller should care about orphans being deleted.
return
}
ds := dsc.resolveControllerRef(history.Namespace, controllerRef)
if ds == nil {
return
}
glog.V(4).Infof("ControllerRevision %s deleted.", history.Name)
dsc.enqueueDaemonSet(ds)
}
func (dsc *DaemonSetsController) addPod(obj interface{}) {
pod := obj.(*v1.Pod)
if pod.DeletionTimestamp != nil {
// on a restart of the controller manager, it's possible a new pod shows up in a state that
// is already pending deletion. Prevent the pod from being a creation observation.
dsc.deletePod(pod)
return
}
// If it has a ControllerRef, that's all that matters.
if controllerRef := metav1.GetControllerOf(pod); controllerRef != nil {
ds := dsc.resolveControllerRef(pod.Namespace, controllerRef)
if ds == nil {
return
}
dsKey, err := controller.KeyFunc(ds)
if err != nil {
return
}
glog.V(4).Infof("Pod %s added.", pod.Name)
dsc.expectations.CreationObserved(dsKey)
dsc.enqueueDaemonSet(ds)
return
}
// Otherwise, it's an orphan. Get a list of all matching DaemonSets and sync
// them to see if anyone wants to adopt it.
// DO NOT observe creation because no controller should be waiting for an
// orphan.
dss := dsc.getDaemonSetsForPod(pod)
if len(dss) == 0 {
return
}
glog.V(4).Infof("Orphan Pod %s added.", pod.Name)
for _, ds := range dss {
dsc.enqueueDaemonSet(ds)
}
}
// When a pod is updated, figure out what sets manage it and wake them
// up. If the labels of the pod have changed we need to awaken both the old
// and new set. old and cur must be *v1.Pod types.
func (dsc *DaemonSetsController) updatePod(old, cur interface{}) {
curPod := cur.(*v1.Pod)
oldPod := old.(*v1.Pod)
if curPod.ResourceVersion == oldPod.ResourceVersion {
// Periodic resync will send update events for all known pods.
// Two different versions of the same pod will always have different RVs.
return
}
curControllerRef := metav1.GetControllerOf(curPod)
oldControllerRef := metav1.GetControllerOf(oldPod)
controllerRefChanged := !reflect.DeepEqual(curControllerRef, oldControllerRef)
if controllerRefChanged && oldControllerRef != nil {
// The ControllerRef was changed. Sync the old controller, if any.
if ds := dsc.resolveControllerRef(oldPod.Namespace, oldControllerRef); ds != nil {
dsc.enqueueDaemonSet(ds)
}
}
// If it has a ControllerRef, that's all that matters.
if curControllerRef != nil {
ds := dsc.resolveControllerRef(curPod.Namespace, curControllerRef)
if ds == nil {
return
}
glog.V(4).Infof("Pod %s updated.", curPod.Name)
dsc.enqueueDaemonSet(ds)
changedToReady := !podutil.IsPodReady(oldPod) && podutil.IsPodReady(curPod)
// See https://github.com/kubernetes/kubernetes/pull/38076 for more details
if changedToReady && ds.Spec.MinReadySeconds > 0 {
// Add a second to avoid milliseconds skew in AddAfter.
// See https://github.com/kubernetes/kubernetes/issues/39785#issuecomment-279959133 for more info.
dsc.enqueueDaemonSetAfter(ds, (time.Duration(ds.Spec.MinReadySeconds)*time.Second)+time.Second)
}
return
}
// Otherwise, it's an orphan. If anything changed, sync matching controllers
// to see if anyone wants to adopt it now.
dss := dsc.getDaemonSetsForPod(curPod)
if len(dss) == 0 {
return
}
glog.V(4).Infof("Orphan Pod %s updated.", curPod.Name)
labelChanged := !reflect.DeepEqual(curPod.Labels, oldPod.Labels)
if labelChanged || controllerRefChanged {
for _, ds := range dss {
dsc.enqueueDaemonSet(ds)
}
}
}
// listSuspendedDaemonPods lists the Daemon pods that 'want to run, but should not schedule'
// for the node.
func (dsc *DaemonSetsController) listSuspendedDaemonPods(node string) (dss []string) {
dsc.suspendedDaemonPodsMutex.Lock()
defer dsc.suspendedDaemonPodsMutex.Unlock()
if _, found := dsc.suspendedDaemonPods[node]; !found {
return nil
}
for k := range dsc.suspendedDaemonPods[node] {
dss = append(dss, k)
}
return
}
// requeueSuspendedDaemonPods enqueues all DaemonSets which has pods that 'want to run,
// but should not schedule' for the node; so DaemonSetController will sync up them again.
func (dsc *DaemonSetsController) requeueSuspendedDaemonPods(node string) {
dss := dsc.listSuspendedDaemonPods(node)
for _, dsKey := range dss {
if ns, name, err := cache.SplitMetaNamespaceKey(dsKey); err != nil {
glog.Errorf("Failed to get DaemonSet's namespace and name from %s: %v", dsKey, err)
continue
} else if ds, err := dsc.dsLister.DaemonSets(ns).Get(name); err != nil {
glog.Errorf("Failed to get DaemonSet %s/%s: %v", ns, name, err)
continue
} else {
dsc.enqueueDaemonSetRateLimited(ds)
}
}
}
// addSuspendedDaemonPods adds DaemonSet which has pods that 'want to run,
// but should not schedule' for the node to the suspended queue.
func (dsc *DaemonSetsController) addSuspendedDaemonPods(node, ds string) {
dsc.suspendedDaemonPodsMutex.Lock()
defer dsc.suspendedDaemonPodsMutex.Unlock()
if _, found := dsc.suspendedDaemonPods[node]; !found {
dsc.suspendedDaemonPods[node] = sets.NewString()
}
dsc.suspendedDaemonPods[node].Insert(ds)
}
// removeSuspendedDaemonPods removes DaemonSet which has pods that 'want to run,
// but should not schedule' for the node from suspended queue.
func (dsc *DaemonSetsController) removeSuspendedDaemonPods(node, ds string) {
dsc.suspendedDaemonPodsMutex.Lock()
defer dsc.suspendedDaemonPodsMutex.Unlock()
if _, found := dsc.suspendedDaemonPods[node]; !found {
return
}
dsc.suspendedDaemonPods[node].Delete(ds)
if len(dsc.suspendedDaemonPods[node]) == 0 {
delete(dsc.suspendedDaemonPods, node)
}
}
func (dsc *DaemonSetsController) deletePod(obj interface{}) {
pod, ok := obj.(*v1.Pod)
// When a delete is dropped, the relist will notice a pod in the store not
// in the list, leading to the insertion of a tombstone object which contains
// the deleted key/value. Note that this value might be stale. If the pod
// changed labels the new daemonset will not be woken up till the periodic
// resync.
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
utilruntime.HandleError(fmt.Errorf("couldn't get object from tombstone %#v", obj))
return
}
pod, ok = tombstone.Obj.(*v1.Pod)
if !ok {
utilruntime.HandleError(fmt.Errorf("tombstone contained object that is not a pod %#v", obj))
return
}
}
controllerRef := metav1.GetControllerOf(pod)
if controllerRef == nil {
// No controller should care about orphans being deleted.
if len(pod.Spec.NodeName) != 0 {
// If scheduled pods were deleted, requeue suspended daemon pods.
dsc.requeueSuspendedDaemonPods(pod.Spec.NodeName)
}
return
}
ds := dsc.resolveControllerRef(pod.Namespace, controllerRef)
if ds == nil {
if len(pod.Spec.NodeName) != 0 {
// If scheduled pods were deleted, requeue suspended daemon pods.
dsc.requeueSuspendedDaemonPods(pod.Spec.NodeName)
}
return
}
dsKey, err := controller.KeyFunc(ds)
if err != nil {
return
}
glog.V(4).Infof("Pod %s deleted.", pod.Name)
dsc.expectations.DeletionObserved(dsKey)
dsc.enqueueDaemonSet(ds)
}
func (dsc *DaemonSetsController) addNode(obj interface{}) {
// TODO: it'd be nice to pass a hint with these enqueues, so that each ds would only examine the added node (unless it has other work to do, too).
dsList, err := dsc.dsLister.List(labels.Everything())
if err != nil {
glog.V(4).Infof("Error enqueueing daemon sets: %v", err)
return
}
node := obj.(*v1.Node)
for _, ds := range dsList {
_, shouldSchedule, _, err := dsc.nodeShouldRunDaemonPod(node, ds)
if err != nil {
continue
}
if shouldSchedule {
dsc.enqueueDaemonSet(ds)
}
}
}
// nodeInSameCondition returns true if all effective types ("Status" is true) equals;
// otherwise, returns false.
func nodeInSameCondition(old []v1.NodeCondition, cur []v1.NodeCondition) bool {
if len(old) == 0 && len(cur) == 0 {
return true
}
c1map := map[v1.NodeConditionType]v1.ConditionStatus{}
for _, c := range old {
if c.Status == v1.ConditionTrue {
c1map[c.Type] = c.Status
}
}
for _, c := range cur {
if c.Status != v1.ConditionTrue {
continue
}
if _, found := c1map[c.Type]; !found {
return false
}
delete(c1map, c.Type)
}
return len(c1map) == 0
}
func (dsc *DaemonSetsController) updateNode(old, cur interface{}) {
oldNode := old.(*v1.Node)
curNode := cur.(*v1.Node)
if reflect.DeepEqual(oldNode.Labels, curNode.Labels) &&
reflect.DeepEqual(oldNode.Spec.Taints, curNode.Spec.Taints) &&
nodeInSameCondition(oldNode.Status.Conditions, curNode.Status.Conditions) {
// If node labels, taints and condition didn't change, we can ignore this update.
return
}
dsList, err := dsc.dsLister.List(labels.Everything())
if err != nil {
glog.V(4).Infof("Error listing daemon sets: %v", err)
return
}
// TODO: it'd be nice to pass a hint with these enqueues, so that each ds would only examine the added node (unless it has other work to do, too).
for _, ds := range dsList {
_, oldShouldSchedule, oldShouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(oldNode, ds)
if err != nil {
continue
}
_, currentShouldSchedule, currentShouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(curNode, ds)
if err != nil {
continue
}
if (oldShouldSchedule != currentShouldSchedule) || (oldShouldContinueRunning != currentShouldContinueRunning) {
dsc.enqueueDaemonSet(ds)
}
}
}
// getDaemonPods returns daemon pods owned by the given ds.
// This also reconciles ControllerRef by adopting/orphaning.
// Note that returned Pods are pointers to objects in the cache.
// If you want to modify one, you need to deep-copy it first.
func (dsc *DaemonSetsController) getDaemonPods(ds *apps.DaemonSet) ([]*v1.Pod, error) {
selector, err := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
if err != nil {
return nil, err
}
// List all pods to include those that don't match the selector anymore but
// have a ControllerRef pointing to this controller.
pods, err := dsc.podLister.Pods(ds.Namespace).List(labels.Everything())
if err != nil {
return nil, err
}
// If any adoptions are attempted, we should first recheck for deletion with
// an uncached quorum read sometime after listing Pods (see #42639).
dsNotDeleted := controller.RecheckDeletionTimestamp(func() (metav1.Object, error) {
fresh, err := dsc.kubeClient.AppsV1().DaemonSets(ds.Namespace).Get(ds.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
if fresh.UID != ds.UID {
return nil, fmt.Errorf("original DaemonSet %v/%v is gone: got uid %v, wanted %v", ds.Namespace, ds.Name, fresh.UID, ds.UID)
}
return fresh, nil
})
// Use ControllerRefManager to adopt/orphan as needed.
cm := controller.NewPodControllerRefManager(dsc.podControl, ds, selector, controllerKind, dsNotDeleted)
return cm.ClaimPods(pods)
}
// getNodesToDaemonPods returns a map from nodes to daemon pods (corresponding to ds) created for the nodes.
// This also reconciles ControllerRef by adopting/orphaning.
// Note that returned Pods are pointers to objects in the cache.
// If you want to modify one, you need to deep-copy it first.
func (dsc *DaemonSetsController) getNodesToDaemonPods(ds *apps.DaemonSet) (map[string][]*v1.Pod, error) {
claimedPods, err := dsc.getDaemonPods(ds)
if err != nil {
return nil, err
}
// Group Pods by Node name.
nodeToDaemonPods := make(map[string][]*v1.Pod)
for _, pod := range claimedPods {
nodeName, err := util.GetTargetNodeName(pod)
if err != nil {
glog.Warningf("Failed to get target node name of Pod %v/%v in DaemonSet %v/%v",
pod.Namespace, pod.Name, ds.Namespace, ds.Name)
continue
}
nodeToDaemonPods[nodeName] = append(nodeToDaemonPods[nodeName], pod)
}
return nodeToDaemonPods, nil
}
// resolveControllerRef returns the controller referenced by a ControllerRef,
// or nil if the ControllerRef could not be resolved to a matching controller
// of the correct Kind.
func (dsc *DaemonSetsController) resolveControllerRef(namespace string, controllerRef *metav1.OwnerReference) *apps.DaemonSet {
// We can't look up by UID, so look up by Name and then verify UID.
// Don't even try to look up by Name if it's the wrong Kind.
if controllerRef.Kind != controllerKind.Kind {
return nil
}
ds, err := dsc.dsLister.DaemonSets(namespace).Get(controllerRef.Name)
if err != nil {
return nil
}
if ds.UID != controllerRef.UID {
// The controller we found with this Name is not the same one that the
// ControllerRef points to.
return nil
}
return ds
}
// podsShouldBeOnNode figures out the DaemonSet pods to be created and deleted on the given node:
// - nodesNeedingDaemonPods: the pods need to start on the node
// - podsToDelete: the Pods need to be deleted on the node
// - failedPodsObserved: the number of failed pods on node
// - err: unexpected error
func (dsc *DaemonSetsController) podsShouldBeOnNode(
node *v1.Node,
nodeToDaemonPods map[string][]*v1.Pod,
ds *apps.DaemonSet,
) (nodesNeedingDaemonPods, podsToDelete []string, failedPodsObserved int, err error) {
wantToRun, shouldSchedule, shouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(node, ds)
if err != nil {
return
}
daemonPods, exists := nodeToDaemonPods[node.Name]
dsKey, _ := cache.MetaNamespaceKeyFunc(ds)
dsc.removeSuspendedDaemonPods(node.Name, dsKey)
switch {
case wantToRun && !shouldSchedule:
// If daemon pod is supposed to run, but can not be scheduled, add to suspended list.
dsc.addSuspendedDaemonPods(node.Name, dsKey)
case shouldSchedule && !exists:
// If daemon pod is supposed to be running on node, but isn't, create daemon pod.
nodesNeedingDaemonPods = append(nodesNeedingDaemonPods, node.Name)
case shouldContinueRunning:
// If a daemon pod failed, delete it
// If there's non-daemon pods left on this node, we will create it in the next sync loop
var daemonPodsRunning []*v1.Pod
for _, pod := range daemonPods {
if pod.DeletionTimestamp != nil {
continue
}
if pod.Status.Phase == v1.PodFailed {
msg := fmt.Sprintf("Found failed daemon pod %s/%s on node %s, will try to kill it", pod.Namespace, pod.Name, node.Name)
glog.V(2).Infof(msg)
// Emit an event so that it's discoverable to users.
dsc.eventRecorder.Eventf(ds, v1.EventTypeWarning, FailedDaemonPodReason, msg)
podsToDelete = append(podsToDelete, pod.Name)
failedPodsObserved++
} else {
daemonPodsRunning = append(daemonPodsRunning, pod)
}
}
// If daemon pod is supposed to be running on node, but more than 1 daemon pod is running, delete the excess daemon pods.
// Sort the daemon pods by creation time, so the oldest is preserved.
if len(daemonPodsRunning) > 1 {
sort.Sort(podByCreationTimestampAndPhase(daemonPodsRunning))
for i := 1; i < len(daemonPodsRunning); i++ {
podsToDelete = append(podsToDelete, daemonPodsRunning[i].Name)
}
}
case !shouldContinueRunning && exists:
// If daemon pod isn't supposed to run on node, but it is, delete all daemon pods on node.
for _, pod := range daemonPods {
podsToDelete = append(podsToDelete, pod.Name)
}
}
return nodesNeedingDaemonPods, podsToDelete, failedPodsObserved, nil
}
// manage manages the scheduling and running of Pods of ds on nodes.
// After figuring out which nodes should run a Pod of ds but not yet running one and
// which nodes should not run a Pod of ds but currently running one, it calls function
// syncNodes with a list of pods to remove and a list of nodes to run a Pod of ds.
func (dsc *DaemonSetsController) manage(ds *apps.DaemonSet, hash string) error {
// Find out the pods which are created for the nodes by DaemonSet.
nodeToDaemonPods, err := dsc.getNodesToDaemonPods(ds)
if err != nil {
return fmt.Errorf("couldn't get node to daemon pod mapping for daemon set %q: %v", ds.Name, err)
}
// For each node, if the node is running the daemon pod but isn't supposed to, kill the daemon
// pod. If the node is supposed to run the daemon pod, but isn't, create the daemon pod on the node.
nodeList, err := dsc.nodeLister.List(labels.Everything())
if err != nil {
return fmt.Errorf("couldn't get list of nodes when syncing daemon set %#v: %v", ds, err)
}
var nodesNeedingDaemonPods, podsToDelete []string
var failedPodsObserved int
for _, node := range nodeList {
nodesNeedingDaemonPodsOnNode, podsToDeleteOnNode, failedPodsObservedOnNode, err := dsc.podsShouldBeOnNode(
node, nodeToDaemonPods, ds)
if err != nil {
continue
}
nodesNeedingDaemonPods = append(nodesNeedingDaemonPods, nodesNeedingDaemonPodsOnNode...)
podsToDelete = append(podsToDelete, podsToDeleteOnNode...)
failedPodsObserved += failedPodsObservedOnNode
}
// Label new pods using the hash label value of the current history when creating them
if err = dsc.syncNodes(ds, podsToDelete, nodesNeedingDaemonPods, hash); err != nil {
return err
}
// Throw an error when the daemon pods fail, to use ratelimiter to prevent kill-recreate hot loop
if failedPodsObserved > 0 {
return fmt.Errorf("deleted %d failed pods of DaemonSet %s/%s", failedPodsObserved, ds.Namespace, ds.Name)
}
return nil
}
// syncNodes deletes given pods and creates new daemon set pods on the given nodes
// returns slice with erros if any
func (dsc *DaemonSetsController) syncNodes(ds *apps.DaemonSet, podsToDelete, nodesNeedingDaemonPods []string, hash string) error {
// We need to set expectations before creating/deleting pods to avoid race conditions.
dsKey, err := controller.KeyFunc(ds)
if err != nil {
return fmt.Errorf("couldn't get key for object %#v: %v", ds, err)
}
createDiff := len(nodesNeedingDaemonPods)
deleteDiff := len(podsToDelete)
if createDiff > dsc.burstReplicas {
createDiff = dsc.burstReplicas
}
if deleteDiff > dsc.burstReplicas {
deleteDiff = dsc.burstReplicas
}
dsc.expectations.SetExpectations(dsKey, createDiff, deleteDiff)
// error channel to communicate back failures. make the buffer big enough to avoid any blocking
errCh := make(chan error, createDiff+deleteDiff)
glog.V(4).Infof("Nodes needing daemon pods for daemon set %s: %+v, creating %d", ds.Name, nodesNeedingDaemonPods, createDiff)
createWait := sync.WaitGroup{}
// If the returned error is not nil we have a parse error.
// The controller handles this via the hash.
generation, err := util.GetTemplateGeneration(ds)
if err != nil {
generation = nil
}
template := util.CreatePodTemplate(ds.Spec.Template, generation, hash)
// Batch the pod creates. Batch sizes start at SlowStartInitialBatchSize
// and double with each successful iteration in a kind of "slow start".
// This handles attempts to start large numbers of pods that would
// likely all fail with the same error. For example a project with a
// low quota that attempts to create a large number of pods will be
// prevented from spamming the API service with the pod create requests
// after one of its pods fails. Conveniently, this also prevents the
// event spam that those failures would generate.
batchSize := integer.IntMin(createDiff, controller.SlowStartInitialBatchSize)
for pos := 0; createDiff > pos; batchSize, pos = integer.IntMin(2*batchSize, createDiff-(pos+batchSize)), pos+batchSize {
errorCount := len(errCh)
createWait.Add(batchSize)
for i := pos; i < pos+batchSize; i++ {
go func(ix int) {
defer createWait.Done()
var err error
podTemplate := &template
if utilfeature.DefaultFeatureGate.Enabled(features.ScheduleDaemonSetPods) {
podTemplate = template.DeepCopy()
// The pod's NodeAffinity will be updated to make sure the Pod is bound
// to the target node by default scheduler. It is safe to do so because there
// should be no conflicting node affinity with the target node.
podTemplate.Spec.Affinity = util.ReplaceDaemonSetPodNodeNameNodeAffinity(
podTemplate.Spec.Affinity, nodesNeedingDaemonPods[ix])
podTemplate.Spec.Tolerations = util.AppendNoScheduleTolerationIfNotExist(podTemplate.Spec.Tolerations)
err = dsc.podControl.CreatePodsWithControllerRef(ds.Namespace, podTemplate,
ds, metav1.NewControllerRef(ds, controllerKind))
} else {
err = dsc.podControl.CreatePodsOnNode(nodesNeedingDaemonPods[ix], ds.Namespace, podTemplate,
ds, metav1.NewControllerRef(ds, controllerKind))
}
if err != nil && errors.IsTimeout(err) {
// Pod is created but its initialization has timed out.
// If the initialization is successful eventually, the
// controller will observe the creation via the informer.
// If the initialization fails, or if the pod keeps
// uninitialized for a long time, the informer will not
// receive any update, and the controller will create a new
// pod when the expectation expires.
return
}
if err != nil {
glog.V(2).Infof("Failed creation, decrementing expectations for set %q/%q", ds.Namespace, ds.Name)
dsc.expectations.CreationObserved(dsKey)