812 lines
29 KiB
Go
812 lines
29 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package daemon
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import (
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"fmt"
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"reflect"
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"sort"
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"sync"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/v1"
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extensions "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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v1core "k8s.io/kubernetes/pkg/client/clientset_generated/clientset/typed/core/v1"
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unversionedextensions "k8s.io/kubernetes/pkg/client/clientset_generated/clientset/typed/extensions/v1beta1"
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"k8s.io/kubernetes/pkg/client/legacylisters"
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"k8s.io/kubernetes/pkg/client/record"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/controller/informers"
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"k8s.io/kubernetes/pkg/util/metrics"
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"k8s.io/kubernetes/pkg/util/workqueue"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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"github.com/golang/glog"
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)
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const (
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// Daemon sets will periodically check that their daemon pods are running as expected.
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FullDaemonSetResyncPeriod = 30 * time.Second // TODO: Figure out if this time seems reasonable.
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// Realistic value of the burstReplica field for the replication manager based off
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// performance requirements for kubernetes 1.0.
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BurstReplicas = 500
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// If sending a status upate to API server fails, we retry a finite number of times.
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StatusUpdateRetries = 1
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)
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// DaemonSetsController is responsible for synchronizing DaemonSet objects stored
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// in the system with actual running pods.
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type DaemonSetsController struct {
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kubeClient clientset.Interface
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eventRecorder record.EventRecorder
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podControl controller.PodControlInterface
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// An dsc is temporarily suspended after creating/deleting these many replicas.
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// It resumes normal action after observing the watch events for them.
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burstReplicas int
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// To allow injection of syncDaemonSet for testing.
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syncHandler func(dsKey string) error
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// A TTLCache of pod creates/deletes each ds expects to see
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expectations controller.ControllerExpectationsInterface
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// A store of daemon sets
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dsStore *listers.StoreToDaemonSetLister
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// A store of pods
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podStore *listers.StoreToPodLister
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// A store of nodes
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nodeStore *listers.StoreToNodeLister
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// dsStoreSynced returns true if the daemonset store has been synced at least once.
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// Added as a member to the struct to allow injection for testing.
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dsStoreSynced cache.InformerSynced
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// podStoreSynced returns true if the pod store has been synced at least once.
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// Added as a member to the struct to allow injection for testing.
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podStoreSynced cache.InformerSynced
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// nodeStoreSynced returns true if the node store has been synced at least once.
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// Added as a member to the struct to allow injection for testing.
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nodeStoreSynced cache.InformerSynced
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lookupCache *controller.MatchingCache
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// DaemonSet keys that need to be synced.
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queue workqueue.RateLimitingInterface
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}
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func NewDaemonSetsController(daemonSetInformer informers.DaemonSetInformer, podInformer informers.PodInformer, nodeInformer informers.NodeInformer, kubeClient clientset.Interface, lookupCacheSize int) *DaemonSetsController {
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartLogging(glog.Infof)
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// TODO: remove the wrapper when every clients have moved to use the clientset.
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eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: kubeClient.Core().Events("")})
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if kubeClient != nil && kubeClient.Core().RESTClient().GetRateLimiter() != nil {
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metrics.RegisterMetricAndTrackRateLimiterUsage("daemon_controller", kubeClient.Core().RESTClient().GetRateLimiter())
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}
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dsc := &DaemonSetsController{
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kubeClient: kubeClient,
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eventRecorder: eventBroadcaster.NewRecorder(v1.EventSource{Component: "daemonset-controller"}),
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podControl: controller.RealPodControl{
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KubeClient: kubeClient,
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Recorder: eventBroadcaster.NewRecorder(v1.EventSource{Component: "daemon-set"}),
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},
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burstReplicas: BurstReplicas,
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expectations: controller.NewControllerExpectations(),
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queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "daemonset"),
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}
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daemonSetInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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ds := obj.(*extensions.DaemonSet)
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glog.V(4).Infof("Adding daemon set %s", ds.Name)
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dsc.enqueueDaemonSet(ds)
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},
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UpdateFunc: func(old, cur interface{}) {
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oldDS := old.(*extensions.DaemonSet)
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curDS := cur.(*extensions.DaemonSet)
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// We should invalidate the whole lookup cache if a DS's selector has been updated.
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//
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// Imagine that you have two RSs:
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// * old DS1
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// * new DS2
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// You also have a pod that is attached to DS2 (because it doesn't match DS1 selector).
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// Now imagine that you are changing DS1 selector so that it is now matching that pod,
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// in such case we must invalidate the whole cache so that pod could be adopted by DS1
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//
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// This makes the lookup cache less helpful, but selector update does not happen often,
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// so it's not a big problem
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if !reflect.DeepEqual(oldDS.Spec.Selector, curDS.Spec.Selector) {
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dsc.lookupCache.InvalidateAll()
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}
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glog.V(4).Infof("Updating daemon set %s", oldDS.Name)
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dsc.enqueueDaemonSet(curDS)
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},
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DeleteFunc: dsc.deleteDaemonset,
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})
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dsc.dsStore = daemonSetInformer.Lister()
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dsc.dsStoreSynced = daemonSetInformer.Informer().HasSynced
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// Watch for creation/deletion of pods. The reason we watch is that we don't want a daemon set to create/delete
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// more pods until all the effects (expectations) of a daemon set's create/delete have been observed.
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podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: dsc.addPod,
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UpdateFunc: dsc.updatePod,
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DeleteFunc: dsc.deletePod,
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})
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dsc.podStore = podInformer.Lister()
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dsc.podStoreSynced = podInformer.Informer().HasSynced
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nodeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: dsc.addNode,
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UpdateFunc: dsc.updateNode,
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},
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)
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dsc.nodeStoreSynced = nodeInformer.Informer().HasSynced
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dsc.nodeStore = nodeInformer.Lister()
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dsc.syncHandler = dsc.syncDaemonSet
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dsc.lookupCache = controller.NewMatchingCache(lookupCacheSize)
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return dsc
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}
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func (dsc *DaemonSetsController) deleteDaemonset(obj interface{}) {
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ds, ok := obj.(*extensions.DaemonSet)
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if !ok {
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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glog.Errorf("Couldn't get object from tombstone %#v", obj)
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return
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}
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ds, ok = tombstone.Obj.(*extensions.DaemonSet)
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if !ok {
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glog.Errorf("Tombstone contained object that is not a DaemonSet %#v", obj)
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return
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}
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}
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glog.V(4).Infof("Deleting daemon set %s", ds.Name)
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dsc.enqueueDaemonSet(ds)
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}
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// Run begins watching and syncing daemon sets.
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func (dsc *DaemonSetsController) Run(workers int, stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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defer dsc.queue.ShutDown()
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glog.Infof("Starting Daemon Sets controller manager")
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if !cache.WaitForCacheSync(stopCh, dsc.podStoreSynced, dsc.nodeStoreSynced, dsc.dsStoreSynced) {
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return
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}
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for i := 0; i < workers; i++ {
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go wait.Until(dsc.runWorker, time.Second, stopCh)
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}
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<-stopCh
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glog.Infof("Shutting down Daemon Set Controller")
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}
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func (dsc *DaemonSetsController) runWorker() {
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for dsc.processNextWorkItem() {
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}
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}
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// processNextWorkItem deals with one key off the queue. It returns false when it's time to quit.
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func (dsc *DaemonSetsController) processNextWorkItem() bool {
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dsKey, quit := dsc.queue.Get()
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if quit {
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return false
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}
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defer dsc.queue.Done(dsKey)
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err := dsc.syncHandler(dsKey.(string))
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if err == nil {
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dsc.queue.Forget(dsKey)
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return true
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}
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utilruntime.HandleError(fmt.Errorf("%v failed with : %v", dsKey, err))
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dsc.queue.AddRateLimited(dsKey)
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return true
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}
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func (dsc *DaemonSetsController) enqueueDaemonSet(ds *extensions.DaemonSet) {
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key, err := controller.KeyFunc(ds)
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if err != nil {
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glog.Errorf("Couldn't get key for object %#v: %v", ds, err)
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return
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}
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// TODO: Handle overlapping controllers better. See comment in ReplicationManager.
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dsc.queue.Add(key)
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}
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func (dsc *DaemonSetsController) getPodDaemonSet(pod *v1.Pod) *extensions.DaemonSet {
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// look up in the cache, if cached and the cache is valid, just return cached value
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if obj, cached := dsc.lookupCache.GetMatchingObject(pod); cached {
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ds, ok := obj.(*extensions.DaemonSet)
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if !ok {
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// This should not happen
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glog.Errorf("lookup cache does not retuen a ReplicationController object")
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return nil
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}
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if dsc.isCacheValid(pod, ds) {
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return ds
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}
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}
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sets, err := dsc.dsStore.GetPodDaemonSets(pod)
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if err != nil {
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glog.V(4).Infof("No daemon sets found for pod %v, daemon set controller will avoid syncing", pod.Name)
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return nil
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}
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if len(sets) > 1 {
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// More than two items in this list indicates user error. If two daemon
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// sets overlap, sort by creation timestamp, subsort by name, then pick
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// the first.
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glog.Errorf("user error! more than one daemon is selecting pods with labels: %+v", pod.Labels)
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sort.Sort(byCreationTimestamp(sets))
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}
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// update lookup cache
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dsc.lookupCache.Update(pod, &sets[0])
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return &sets[0]
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}
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// isCacheValid check if the cache is valid
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func (dsc *DaemonSetsController) isCacheValid(pod *v1.Pod, cachedDS *extensions.DaemonSet) bool {
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_, exists, err := dsc.dsStore.Get(cachedDS)
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// ds has been deleted or updated, cache is invalid
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if err != nil || !exists || !isDaemonSetMatch(pod, cachedDS) {
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return false
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}
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return true
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}
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// isDaemonSetMatch take a Pod and DaemonSet, return whether the Pod and DaemonSet are matching
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// TODO(mqliang): This logic is a copy from GetPodDaemonSets(), remove the duplication
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func isDaemonSetMatch(pod *v1.Pod, ds *extensions.DaemonSet) bool {
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if ds.Namespace != pod.Namespace {
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return false
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}
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selector, err := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
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if err != nil {
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err = fmt.Errorf("invalid selector: %v", err)
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return false
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}
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// If a ReplicaSet with a nil or empty selector creeps in, it should match nothing, not everything.
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if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
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return false
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}
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return true
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}
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func (dsc *DaemonSetsController) addPod(obj interface{}) {
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pod := obj.(*v1.Pod)
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glog.V(4).Infof("Pod %s added.", pod.Name)
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if ds := dsc.getPodDaemonSet(pod); ds != nil {
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dsKey, err := controller.KeyFunc(ds)
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if err != nil {
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glog.Errorf("Couldn't get key for object %#v: %v", ds, err)
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return
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}
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dsc.expectations.CreationObserved(dsKey)
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dsc.enqueueDaemonSet(ds)
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}
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}
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// When a pod is updated, figure out what sets manage it and wake them
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// up. If the labels of the pod have changed we need to awaken both the old
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// and new set. old and cur must be *v1.Pod types.
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func (dsc *DaemonSetsController) updatePod(old, cur interface{}) {
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curPod := cur.(*v1.Pod)
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oldPod := old.(*v1.Pod)
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if curPod.ResourceVersion == oldPod.ResourceVersion {
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// Periodic resync will send update events for all known pods.
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// Two different versions of the same pod will always have different RVs.
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return
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}
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glog.V(4).Infof("Pod %s updated.", curPod.Name)
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if curDS := dsc.getPodDaemonSet(curPod); curDS != nil {
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dsc.enqueueDaemonSet(curDS)
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}
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// If the labels have not changed, then the daemon set responsible for
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// the pod is the same as it was before. In that case we have enqueued the daemon
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// set above, and do not have to enqueue the set again.
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if !reflect.DeepEqual(curPod.Labels, oldPod.Labels) {
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// It's ok if both oldDS and curDS are the same, because curDS will set
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// the expectations on its run so oldDS will have no effect.
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if oldDS := dsc.getPodDaemonSet(oldPod); oldDS != nil {
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dsc.enqueueDaemonSet(oldDS)
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}
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}
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}
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func (dsc *DaemonSetsController) deletePod(obj interface{}) {
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pod, ok := obj.(*v1.Pod)
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// When a delete is dropped, the relist will notice a pod in the store not
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// in the list, leading to the insertion of a tombstone object which contains
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// the deleted key/value. Note that this value might be stale. If the pod
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// changed labels the new daemonset will not be woken up till the periodic
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// resync.
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if !ok {
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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glog.Errorf("Couldn't get object from tombstone %#v", obj)
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return
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}
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pod, ok = tombstone.Obj.(*v1.Pod)
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if !ok {
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glog.Errorf("Tombstone contained object that is not a pod %#v", obj)
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return
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}
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}
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glog.V(4).Infof("Pod %s deleted.", pod.Name)
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if ds := dsc.getPodDaemonSet(pod); ds != nil {
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dsKey, err := controller.KeyFunc(ds)
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if err != nil {
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glog.Errorf("Couldn't get key for object %#v: %v", ds, err)
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return
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}
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dsc.expectations.DeletionObserved(dsKey)
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dsc.enqueueDaemonSet(ds)
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}
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}
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func (dsc *DaemonSetsController) addNode(obj interface{}) {
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// 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).
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dsList, err := dsc.dsStore.List()
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if err != nil {
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glog.V(4).Infof("Error enqueueing daemon sets: %v", err)
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return
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}
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node := obj.(*v1.Node)
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for i := range dsList.Items {
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ds := &dsList.Items[i]
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_, shouldSchedule, _, err := dsc.nodeShouldRunDaemonPod(node, ds)
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if err != nil {
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continue
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}
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if shouldSchedule {
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dsc.enqueueDaemonSet(ds)
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}
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}
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}
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func (dsc *DaemonSetsController) updateNode(old, cur interface{}) {
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oldNode := old.(*v1.Node)
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curNode := cur.(*v1.Node)
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if reflect.DeepEqual(oldNode.Labels, curNode.Labels) {
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// If node labels didn't change, we can ignore this update.
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return
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}
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dsList, err := dsc.dsStore.List()
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if err != nil {
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glog.V(4).Infof("Error enqueueing daemon sets: %v", err)
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return
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}
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// 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).
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for i := range dsList.Items {
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ds := &dsList.Items[i]
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_, oldShouldSchedule, oldShouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(oldNode, ds)
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if err != nil {
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continue
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}
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_, currentShouldSchedule, currentShouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(curNode, ds)
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if err != nil {
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continue
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}
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if (oldShouldSchedule != currentShouldSchedule) || (oldShouldContinueRunning != currentShouldContinueRunning) {
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dsc.enqueueDaemonSet(ds)
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}
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}
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}
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// getNodesToDaemonSetPods returns a map from nodes to daemon pods (corresponding to ds) running on the nodes.
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func (dsc *DaemonSetsController) getNodesToDaemonPods(ds *extensions.DaemonSet) (map[string][]*v1.Pod, error) {
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nodeToDaemonPods := make(map[string][]*v1.Pod)
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selector, err := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
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if err != nil {
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return nil, err
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}
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daemonPods, err := dsc.podStore.Pods(ds.Namespace).List(selector)
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if err != nil {
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return nodeToDaemonPods, err
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}
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for i := range daemonPods {
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// TODO: Do we need to copy here?
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daemonPod := &(*daemonPods[i])
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nodeName := daemonPod.Spec.NodeName
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nodeToDaemonPods[nodeName] = append(nodeToDaemonPods[nodeName], daemonPod)
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}
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return nodeToDaemonPods, nil
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}
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func (dsc *DaemonSetsController) manage(ds *extensions.DaemonSet) error {
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// Find out which nodes are running the daemon pods selected by ds.
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nodeToDaemonPods, err := dsc.getNodesToDaemonPods(ds)
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if err != nil {
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return fmt.Errorf("error getting node to daemon pod mapping for daemon set %#v: %v", ds, err)
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}
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// 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.nodeStore.List()
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get list of nodes when syncing daemon set %#v: %v", ds, err)
|
|
}
|
|
var nodesNeedingDaemonPods, podsToDelete []string
|
|
for _, node := range nodeList.Items {
|
|
_, shouldSchedule, shouldContinueRunning, err := dsc.nodeShouldRunDaemonPod(&node, ds)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
daemonPods, isRunning := nodeToDaemonPods[node.Name]
|
|
|
|
switch {
|
|
case shouldSchedule && !isRunning:
|
|
// If daemon pod is supposed to be running on node, but isn't, create daemon pod.
|
|
nodesNeedingDaemonPods = append(nodesNeedingDaemonPods, node.Name)
|
|
case shouldContinueRunning && len(daemonPods) > 1:
|
|
// 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 the oldest is preserved.
|
|
sort.Sort(podByCreationTimestamp(daemonPods))
|
|
for i := 1; i < len(daemonPods); i++ {
|
|
podsToDelete = append(podsToDelete, daemonPods[i].Name)
|
|
}
|
|
case !shouldContinueRunning && isRunning:
|
|
// If daemon pod isn't supposed to run on node, but it is, delete all daemon pods on node.
|
|
for i := range daemonPods {
|
|
podsToDelete = append(podsToDelete, daemonPods[i].Name)
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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{}
|
|
createWait.Add(createDiff)
|
|
for i := 0; i < createDiff; i++ {
|
|
go func(ix int) {
|
|
defer createWait.Done()
|
|
if err := dsc.podControl.CreatePodsOnNode(nodesNeedingDaemonPods[ix], ds.Namespace, &ds.Spec.Template, ds); err != nil {
|
|
glog.V(2).Infof("Failed creation, decrementing expectations for set %q/%q", ds.Namespace, ds.Name)
|
|
dsc.expectations.CreationObserved(dsKey)
|
|
errCh <- err
|
|
utilruntime.HandleError(err)
|
|
}
|
|
}(i)
|
|
}
|
|
createWait.Wait()
|
|
|
|
glog.V(4).Infof("Pods to delete for daemon set %s: %+v, deleting %d", ds.Name, podsToDelete, deleteDiff)
|
|
deleteWait := sync.WaitGroup{}
|
|
deleteWait.Add(deleteDiff)
|
|
for i := 0; i < deleteDiff; i++ {
|
|
go func(ix int) {
|
|
defer deleteWait.Done()
|
|
if err := dsc.podControl.DeletePod(ds.Namespace, podsToDelete[ix], ds); err != nil {
|
|
glog.V(2).Infof("Failed deletion, decrementing expectations for set %q/%q", ds.Namespace, ds.Name)
|
|
dsc.expectations.DeletionObserved(dsKey)
|
|
errCh <- err
|
|
utilruntime.HandleError(err)
|
|
}
|
|
}(i)
|
|
}
|
|
deleteWait.Wait()
|
|
|
|
// collect errors if any for proper reporting/retry logic in the controller
|
|
errors := []error{}
|
|
close(errCh)
|
|
for err := range errCh {
|
|
errors = append(errors, err)
|
|
}
|
|
return utilerrors.NewAggregate(errors)
|
|
}
|
|
|
|
func storeDaemonSetStatus(dsClient unversionedextensions.DaemonSetInterface, ds *extensions.DaemonSet, desiredNumberScheduled, currentNumberScheduled, numberMisscheduled, numberReady int) error {
|
|
if int(ds.Status.DesiredNumberScheduled) == desiredNumberScheduled &&
|
|
int(ds.Status.CurrentNumberScheduled) == currentNumberScheduled &&
|
|
int(ds.Status.NumberMisscheduled) == numberMisscheduled &&
|
|
int(ds.Status.NumberReady) == numberReady &&
|
|
ds.Status.ObservedGeneration >= ds.Generation {
|
|
return nil
|
|
}
|
|
|
|
clone, err := api.Scheme.DeepCopy(ds)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
toUpdate := clone.(*extensions.DaemonSet)
|
|
|
|
var updateErr, getErr error
|
|
for i := 0; i < StatusUpdateRetries; i++ {
|
|
toUpdate.Status.ObservedGeneration = ds.Generation
|
|
toUpdate.Status.DesiredNumberScheduled = int32(desiredNumberScheduled)
|
|
toUpdate.Status.CurrentNumberScheduled = int32(currentNumberScheduled)
|
|
toUpdate.Status.NumberMisscheduled = int32(numberMisscheduled)
|
|
toUpdate.Status.NumberReady = int32(numberReady)
|
|
|
|
if _, updateErr = dsClient.UpdateStatus(toUpdate); updateErr == nil {
|
|
return nil
|
|
}
|
|
|
|
// Update the set with the latest resource version for the next poll
|
|
if toUpdate, getErr = dsClient.Get(ds.Name, metav1.GetOptions{}); getErr != nil {
|
|
// If the GET fails we can't trust status.Replicas anymore. This error
|
|
// is bound to be more interesting than the update failure.
|
|
return getErr
|
|
}
|
|
}
|
|
return updateErr
|
|
}
|
|
|
|
func (dsc *DaemonSetsController) updateDaemonSetStatus(ds *extensions.DaemonSet) error {
|
|
glog.V(4).Infof("Updating daemon set status")
|
|
nodeToDaemonPods, err := dsc.getNodesToDaemonPods(ds)
|
|
if err != nil {
|
|
return fmt.Errorf("error getting node to daemon pod mapping for daemon set %#v: %v", ds, err)
|
|
}
|
|
|
|
nodeList, err := dsc.nodeStore.List()
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get list of nodes when updating daemon set %#v: %v", ds, err)
|
|
}
|
|
|
|
var desiredNumberScheduled, currentNumberScheduled, numberMisscheduled, numberReady int
|
|
for _, node := range nodeList.Items {
|
|
wantToRun, _, _, err := dsc.nodeShouldRunDaemonPod(&node, ds)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
scheduled := len(nodeToDaemonPods[node.Name]) > 0
|
|
|
|
if wantToRun {
|
|
desiredNumberScheduled++
|
|
if scheduled {
|
|
currentNumberScheduled++
|
|
// Sort the daemon pods by creation time, so the the oldest is first.
|
|
daemonPods, _ := nodeToDaemonPods[node.Name]
|
|
sort.Sort(podByCreationTimestamp(daemonPods))
|
|
if v1.IsPodReady(daemonPods[0]) {
|
|
numberReady++
|
|
}
|
|
}
|
|
} else {
|
|
if scheduled {
|
|
numberMisscheduled++
|
|
}
|
|
}
|
|
}
|
|
|
|
err = storeDaemonSetStatus(dsc.kubeClient.Extensions().DaemonSets(ds.Namespace), ds, desiredNumberScheduled, currentNumberScheduled, numberMisscheduled, numberReady)
|
|
if err != nil {
|
|
return fmt.Errorf("error storing status for daemon set %#v: %v", ds, err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (dsc *DaemonSetsController) syncDaemonSet(key string) error {
|
|
startTime := time.Now()
|
|
defer func() {
|
|
glog.V(4).Infof("Finished syncing daemon set %q (%v)", key, time.Now().Sub(startTime))
|
|
}()
|
|
|
|
obj, exists, err := dsc.dsStore.Store.GetByKey(key)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to retrieve ds %v from store: %v", key, err)
|
|
}
|
|
if !exists {
|
|
glog.V(3).Infof("daemon set has been deleted %v", key)
|
|
dsc.expectations.DeleteExpectations(key)
|
|
return nil
|
|
}
|
|
ds := obj.(*extensions.DaemonSet)
|
|
|
|
everything := metav1.LabelSelector{}
|
|
if reflect.DeepEqual(ds.Spec.Selector, &everything) {
|
|
dsc.eventRecorder.Eventf(ds, v1.EventTypeWarning, "SelectingAll", "This daemon set is selecting all pods. A non-empty selector is required.")
|
|
return nil
|
|
}
|
|
|
|
// Don't process a daemon set until all its creations and deletions have been processed.
|
|
// For example if daemon set foo asked for 3 new daemon pods in the previous call to manage,
|
|
// then we do not want to call manage on foo until the daemon pods have been created.
|
|
dsKey, err := controller.KeyFunc(ds)
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get key for object %#v: %v", ds, err)
|
|
}
|
|
dsNeedsSync := dsc.expectations.SatisfiedExpectations(dsKey)
|
|
if dsNeedsSync && ds.DeletionTimestamp == nil {
|
|
if err := dsc.manage(ds); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return dsc.updateDaemonSetStatus(ds)
|
|
}
|
|
|
|
// nodeShouldRunDaemonPod checks a set of preconditions against a (node,daemonset) and returns a
|
|
// summary. Returned booleans are:
|
|
// * wantToRun:
|
|
// Returns true when a user would expect a pod to run on this node and ignores conditions
|
|
// such as OutOfDisk or insufficent resource that would cause a daemonset pod not to schedule.
|
|
// This is primarily used to populate daemonset status.
|
|
// * shouldSchedule:
|
|
// Returns true when a daemonset should be scheduled to a node if a daemonset pod is not already
|
|
// running on that node.
|
|
// * shouldContinueRunning:
|
|
// Returns true when a daemonset should continue running on a node if a daemonset pod is already
|
|
// running on that node.
|
|
func (dsc *DaemonSetsController) nodeShouldRunDaemonPod(node *v1.Node, ds *extensions.DaemonSet) (wantToRun, shouldSchedule, shouldContinueRunning bool, err error) {
|
|
// Because these bools require an && of all their required conditions, we start
|
|
// with all bools set to true and set a bool to false if a condition is not met.
|
|
// A bool should probably not be set to true after this line.
|
|
wantToRun, shouldSchedule, shouldContinueRunning = true, true, true
|
|
// If the daemon set specifies a node name, check that it matches with node.Name.
|
|
if !(ds.Spec.Template.Spec.NodeName == "" || ds.Spec.Template.Spec.NodeName == node.Name) {
|
|
return false, false, false, nil
|
|
}
|
|
|
|
// TODO: Move it to the predicates
|
|
for _, c := range node.Status.Conditions {
|
|
if c.Type == v1.NodeOutOfDisk && c.Status == v1.ConditionTrue {
|
|
// the kubelet will evict this pod if it needs to. Let kubelet
|
|
// decide whether to continue running this pod so leave shouldContinueRunning
|
|
// set to true
|
|
shouldSchedule = false
|
|
}
|
|
}
|
|
|
|
newPod := &v1.Pod{Spec: ds.Spec.Template.Spec, ObjectMeta: ds.Spec.Template.ObjectMeta}
|
|
newPod.Namespace = ds.Namespace
|
|
newPod.Spec.NodeName = node.Name
|
|
|
|
pods := []*v1.Pod{}
|
|
|
|
for _, m := range dsc.podStore.Indexer.List() {
|
|
pod := m.(*v1.Pod)
|
|
if pod.Spec.NodeName != node.Name {
|
|
continue
|
|
}
|
|
if pod.Status.Phase == v1.PodSucceeded || pod.Status.Phase == v1.PodFailed {
|
|
continue
|
|
}
|
|
// ignore pods that belong to the daemonset when taking into account whether
|
|
// a daemonset should bind to a node.
|
|
if pds := dsc.getPodDaemonSet(pod); pds != nil && ds.Name == pds.Name {
|
|
continue
|
|
}
|
|
pods = append(pods, pod)
|
|
}
|
|
|
|
nodeInfo := schedulercache.NewNodeInfo(pods...)
|
|
nodeInfo.SetNode(node)
|
|
_, reasons, err := predicates.GeneralPredicates(newPod, nil, nodeInfo)
|
|
if err != nil {
|
|
glog.Warningf("GeneralPredicates failed on ds '%s/%s' due to unexpected error: %v", ds.ObjectMeta.Namespace, ds.ObjectMeta.Name, err)
|
|
return false, false, false, err
|
|
}
|
|
for _, r := range reasons {
|
|
glog.V(4).Infof("GeneralPredicates failed on ds '%s/%s' for reason: %v", ds.ObjectMeta.Namespace, ds.ObjectMeta.Name, r.GetReason())
|
|
switch reason := r.(type) {
|
|
case *predicates.InsufficientResourceError:
|
|
dsc.eventRecorder.Eventf(ds, v1.EventTypeNormal, "FailedPlacement", "failed to place pod on %q: %s", node.ObjectMeta.Name, reason.Error())
|
|
shouldSchedule = false
|
|
case *predicates.PredicateFailureError:
|
|
var emitEvent bool
|
|
// we try to partition predicates into two partitions here: intentional on the part of the operator and not.
|
|
switch reason {
|
|
// intentional
|
|
case
|
|
predicates.ErrNodeSelectorNotMatch,
|
|
predicates.ErrPodNotMatchHostName,
|
|
predicates.ErrNodeLabelPresenceViolated,
|
|
// this one is probably intentional since it's a workaround for not having
|
|
// pod hard anti affinity.
|
|
predicates.ErrPodNotFitsHostPorts:
|
|
wantToRun, shouldSchedule, shouldContinueRunning = false, false, false
|
|
// unintentional
|
|
case
|
|
predicates.ErrDiskConflict,
|
|
predicates.ErrVolumeZoneConflict,
|
|
predicates.ErrMaxVolumeCountExceeded,
|
|
predicates.ErrNodeUnderMemoryPressure,
|
|
predicates.ErrNodeUnderDiskPressure:
|
|
// wantToRun and shouldContinueRunning are likely true here. They are
|
|
// absolutely true at the time of writing the comment. See first comment
|
|
// of this method.
|
|
shouldSchedule = false
|
|
emitEvent = true
|
|
// unexpected
|
|
case
|
|
predicates.ErrPodAffinityNotMatch,
|
|
predicates.ErrServiceAffinityViolated,
|
|
predicates.ErrTaintsTolerationsNotMatch:
|
|
return false, false, false, fmt.Errorf("unexpected reason: GeneralPredicates should not return reason %s", reason.GetReason())
|
|
default:
|
|
glog.V(4).Infof("unknownd predicate failure reason: %s", reason.GetReason())
|
|
wantToRun, shouldSchedule, shouldContinueRunning = false, false, false
|
|
emitEvent = true
|
|
}
|
|
if emitEvent {
|
|
dsc.eventRecorder.Eventf(ds, v1.EventTypeNormal, "FailedPlacement", "failed to place pod on %q: %s", node.ObjectMeta.Name, reason.GetReason())
|
|
}
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// byCreationTimestamp sorts a list by creation timestamp, using their names as a tie breaker.
|
|
type byCreationTimestamp []extensions.DaemonSet
|
|
|
|
func (o byCreationTimestamp) Len() int { return len(o) }
|
|
func (o byCreationTimestamp) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
|
|
|
|
func (o byCreationTimestamp) Less(i, j int) bool {
|
|
if o[i].CreationTimestamp.Equal(o[j].CreationTimestamp) {
|
|
return o[i].Name < o[j].Name
|
|
}
|
|
return o[i].CreationTimestamp.Before(o[j].CreationTimestamp)
|
|
}
|
|
|
|
type podByCreationTimestamp []*v1.Pod
|
|
|
|
func (o podByCreationTimestamp) Len() int { return len(o) }
|
|
func (o podByCreationTimestamp) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
|
|
|
|
func (o podByCreationTimestamp) Less(i, j int) bool {
|
|
if o[i].CreationTimestamp.Equal(o[j].CreationTimestamp) {
|
|
return o[i].Name < o[j].Name
|
|
}
|
|
return o[i].CreationTimestamp.Before(o[j].CreationTimestamp)
|
|
}
|