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disruptionbudget.go
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disruptionbudget.go
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package disruptionbudget
import (
"context"
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
policyv1 "k8s.io/api/policy/v1"
"k8s.io/apimachinery/pkg/api/equality"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
virtv1 "kubevirt.io/api/core/v1"
"kubevirt.io/client-go/kubecli"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/apimachinery/patch"
"kubevirt.io/kubevirt/pkg/controller"
"kubevirt.io/kubevirt/pkg/util/migrations"
"kubevirt.io/kubevirt/pkg/util/pdbs"
virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
)
const deleteNotifFail = "Failed to process delete notification"
const (
// FailedCreatePodDisruptionBudgetReason is added in an event if creating a PodDisruptionBudget failed.
FailedCreatePodDisruptionBudgetReason = "FailedCreate"
// SuccessfulCreatePodDisruptionBudgetReason is added in an event if creating a PodDisruptionBudget succeeded.
SuccessfulCreatePodDisruptionBudgetReason = "SuccessfulCreate"
// FailedDeletePodDisruptionBudgetReason is added in an event if deleting a PodDisruptionBudget failed.
FailedDeletePodDisruptionBudgetReason = "FailedDelete"
// SuccessfulDeletePodDisruptionBudgetReason is added in an event if deleting a PodDisruptionBudget succeeded.
SuccessfulDeletePodDisruptionBudgetReason = "SuccessfulDelete"
// FailedUpdatePodDisruptionBudgetReason is added in an event if updating a PodDisruptionBudget failed.
FailedUpdatePodDisruptionBudgetReason = "FailedUpdate"
// SuccessfulUpdatePodDisruptionBudgetReason is added in an event if updating a PodDisruptionBudget succeeded.
SuccessfulUpdatePodDisruptionBudgetReason = "SuccessfulUpdate"
)
type DisruptionBudgetController struct {
clientset kubecli.KubevirtClient
clusterConfig *virtconfig.ClusterConfig
Queue workqueue.RateLimitingInterface
vmiInformer cache.SharedIndexInformer
pdbInformer cache.SharedIndexInformer
podInformer cache.SharedIndexInformer
migrationInformer cache.SharedIndexInformer
recorder record.EventRecorder
podDisruptionBudgetExpectations *controller.UIDTrackingControllerExpectations
}
func NewDisruptionBudgetController(
vmiInformer cache.SharedIndexInformer,
pdbInformer cache.SharedIndexInformer,
podInformer cache.SharedIndexInformer,
migrationInformer cache.SharedIndexInformer,
recorder record.EventRecorder,
clientset kubecli.KubevirtClient,
clusterConfig *virtconfig.ClusterConfig,
) (*DisruptionBudgetController, error) {
c := &DisruptionBudgetController{
Queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "virt-controller-disruption-budget"),
vmiInformer: vmiInformer,
pdbInformer: pdbInformer,
podInformer: podInformer,
migrationInformer: migrationInformer,
recorder: recorder,
clientset: clientset,
clusterConfig: clusterConfig,
podDisruptionBudgetExpectations: controller.NewUIDTrackingControllerExpectations(controller.NewControllerExpectations()),
}
_, err := c.vmiInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addVirtualMachineInstance,
DeleteFunc: c.deleteVirtualMachineInstance,
UpdateFunc: c.updateVirtualMachineInstance,
})
if err != nil {
return nil, err
}
_, err = c.pdbInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addPodDisruptionBudget,
DeleteFunc: c.deletePodDisruptionBudget,
UpdateFunc: c.updatePodDisruptionBudget,
})
if err != nil {
return nil, err
}
_, err = c.podInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
UpdateFunc: c.updatePod,
})
if err != nil {
return nil, err
}
_, err = c.migrationInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
UpdateFunc: c.updateMigration,
})
if err != nil {
return nil, err
}
return c, nil
}
func (c *DisruptionBudgetController) updateMigration(_, curr interface{}) {
vmim := curr.(*virtv1.VirtualMachineInstanceMigration)
if vmim.DeletionTimestamp != nil {
return
}
vmi := &virtv1.VirtualMachineInstance{
ObjectMeta: v1.ObjectMeta{
Namespace: vmim.GetNamespace(),
Name: vmim.Spec.VMIName,
},
}
c.enqueueVirtualMachine(vmi)
}
func (c *DisruptionBudgetController) updatePod(_, curr interface{}) {
pod := curr.(*corev1.Pod)
if pod.DeletionTimestamp != nil {
return
}
controllerRef := v1.GetControllerOf(pod)
if controllerRef == nil {
return
}
vmi := c.resolveControllerRef(pod.Namespace, controllerRef)
if vmi == nil {
return
}
c.enqueueVirtualMachine(vmi)
}
func (c *DisruptionBudgetController) addVirtualMachineInstance(obj interface{}) {
c.enqueueVMI(obj)
}
func (c *DisruptionBudgetController) deleteVirtualMachineInstance(obj interface{}) {
c.enqueueVMI(obj)
}
func (c *DisruptionBudgetController) updateVirtualMachineInstance(_, curr interface{}) {
c.enqueueVMI(curr)
}
func (c *DisruptionBudgetController) enqueueVMI(obj interface{}) {
logger := log.Log
vmi, ok := obj.(*virtv1.VirtualMachineInstance)
// When a delete is dropped, the relist will notice a pdb 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 pdb
// changed labels the new vmi will not be woken up till the periodic resync.
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
log.Log.Reason(fmt.Errorf("couldn't get object from tombstone %+v", obj)).Error(deleteNotifFail)
return
}
vmi, ok = tombstone.Obj.(*virtv1.VirtualMachineInstance)
if !ok {
log.Log.Reason(fmt.Errorf("tombstone contained object that is not a pdb %#v", obj)).Error(deleteNotifFail)
return
}
}
key, err := controller.KeyFunc(vmi)
if err != nil {
logger.Object(vmi).Reason(err).Error("Failed to extract key from vmi.")
}
c.Queue.Add(key)
}
// When a pdb is created, enqueue the vmi that manages it and update its pdbExpectations.
func (c *DisruptionBudgetController) addPodDisruptionBudget(obj interface{}) {
pdb := obj.(*policyv1.PodDisruptionBudget)
if pdb.DeletionTimestamp != nil {
// on a restart of the controller manager, it's possible a new pdb shows up in a state that
// is already pending deletion. Prevent the pdb from being a creation observation.
c.deletePodDisruptionBudget(pdb)
return
}
controllerRef := v1.GetControllerOf(pdb)
vmi := c.resolveControllerRef(pdb.Namespace, controllerRef)
if vmi == nil {
return
}
vmiKey, err := controller.KeyFunc(vmi)
if err != nil {
return
}
log.Log.V(4).Object(pdb).Infof("PodDisruptionBudget created")
c.podDisruptionBudgetExpectations.CreationObserved(vmiKey)
c.enqueueVirtualMachine(vmi)
}
// When a pdb is updated, figure out what vmi/s manage it and wake them
// up. If the labels of the pdb have changed we need to awaken both the old
// and new vmi. old and cur must be *v1.PodDisruptionBudget types.
func (c *DisruptionBudgetController) updatePodDisruptionBudget(old, cur interface{}) {
curPodDisruptionBudget := cur.(*policyv1.PodDisruptionBudget)
oldPodDisruptionBudget := old.(*policyv1.PodDisruptionBudget)
if curPodDisruptionBudget.ResourceVersion == oldPodDisruptionBudget.ResourceVersion {
// Periodic resync will send update events for all known pdbs.
// Two different versions of the same pdb will always have different RVs.
return
}
if curPodDisruptionBudget.DeletionTimestamp != nil {
labelChanged := !equality.Semantic.DeepEqual(curPodDisruptionBudget.Labels, oldPodDisruptionBudget.Labels)
// having a pdb marked for deletion is enough to count as a deletion expectation
c.deletePodDisruptionBudget(curPodDisruptionBudget)
if labelChanged {
// we don't need to check the oldPodDisruptionBudget.DeletionTimestamp because DeletionTimestamp cannot be unset.
c.deletePodDisruptionBudget(oldPodDisruptionBudget)
}
return
}
curControllerRef := v1.GetControllerOf(curPodDisruptionBudget)
oldControllerRef := v1.GetControllerOf(oldPodDisruptionBudget)
controllerRefChanged := !equality.Semantic.DeepEqual(curControllerRef, oldControllerRef)
if controllerRefChanged {
// The ControllerRef was changed. Sync the old controller, if any.
if vmi := c.resolveControllerRef(oldPodDisruptionBudget.Namespace, oldControllerRef); vmi != nil {
c.enqueueVirtualMachine(vmi)
}
}
vmi := c.resolveControllerRef(curPodDisruptionBudget.Namespace, curControllerRef)
if vmi == nil {
return
}
log.Log.V(4).Object(curPodDisruptionBudget).Infof("PodDisruptionBudget updated")
c.enqueueVirtualMachine(vmi)
return
}
// When a pdb is deleted, enqueue the vmi that manages the pdb and update its pdbExpectations.
// obj could be an *v1.PodDisruptionBudget, or a DeletionFinalStateUnknown marker item.
func (c *DisruptionBudgetController) deletePodDisruptionBudget(obj interface{}) {
pdb, ok := obj.(*policyv1.PodDisruptionBudget)
// When a delete is dropped, the relist will notice a pdb 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 pdb
// changed labels the new vmi will not be woken up till the periodic resync.
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
log.Log.Reason(fmt.Errorf("couldn't get object from tombstone %+v", obj)).Error(deleteNotifFail)
return
}
pdb, ok = tombstone.Obj.(*policyv1.PodDisruptionBudget)
if !ok {
log.Log.Reason(fmt.Errorf("tombstone contained object that is not a pdb %#v", obj)).Error(deleteNotifFail)
return
}
}
controllerRef := v1.GetControllerOf(pdb)
vmi := c.resolveControllerRef(pdb.Namespace, controllerRef)
if vmi == nil {
return
}
vmiKey, err := controller.KeyFunc(vmi)
if err != nil {
return
}
key, err := controller.KeyFunc(pdb)
if err != nil {
return
}
c.podDisruptionBudgetExpectations.DeletionObserved(vmiKey, key)
c.enqueueVirtualMachine(vmi)
}
func (c *DisruptionBudgetController) enqueueVirtualMachine(obj interface{}) {
logger := log.Log
vmi := obj.(*virtv1.VirtualMachineInstance)
key, err := controller.KeyFunc(vmi)
if err != nil {
logger.Object(vmi).Reason(err).Error("Failed to extract key from virtualmachineinstance.")
return
}
c.Queue.Add(key)
}
// 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 (c *DisruptionBudgetController) resolveControllerRef(namespace string, controllerRef *v1.OwnerReference) *virtv1.VirtualMachineInstance {
// 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 is nil or the wrong Kind.
if controllerRef == nil || controllerRef.Kind != virtv1.VirtualMachineInstanceGroupVersionKind.Kind {
return nil
}
return &virtv1.VirtualMachineInstance{
ObjectMeta: v1.ObjectMeta{
Name: controllerRef.Name,
Namespace: namespace,
UID: controllerRef.UID,
},
}
}
// Run runs the passed in NodeController.
func (c *DisruptionBudgetController) Run(threadiness int, stopCh <-chan struct{}) {
defer controller.HandlePanic()
defer c.Queue.ShutDown()
log.Log.Info("Starting disruption budget controller.")
// Wait for cache sync before we start the node controller
cache.WaitForCacheSync(stopCh, c.pdbInformer.HasSynced, c.vmiInformer.HasSynced, c.podInformer.HasSynced, c.migrationInformer.HasSynced)
// Start the actual work
for i := 0; i < threadiness; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
log.Log.Info("Stopping disruption budget controller.")
}
func (c *DisruptionBudgetController) runWorker() {
for c.Execute() {
}
}
func (c *DisruptionBudgetController) Execute() bool {
key, quit := c.Queue.Get()
if quit {
return false
}
defer c.Queue.Done(key)
err := c.execute(key.(string))
if err != nil {
log.Log.Reason(err).Infof("reenqueuing VirtualMachineInstance %v", key)
c.Queue.AddRateLimited(key)
} else {
log.Log.V(4).Infof("processed VirtualMachineInstance %v", key)
c.Queue.Forget(key)
}
return true
}
func (c *DisruptionBudgetController) execute(key string) error {
if !c.podDisruptionBudgetExpectations.SatisfiedExpectations(key) {
return nil
}
// Fetch the latest Vm state from cache
obj, vmiExists, err := c.vmiInformer.GetStore().GetByKey(key)
if err != nil {
return err
}
var vmi *virtv1.VirtualMachineInstance
// Once all finalizers are removed the vmi gets deleted and we can clean all expectations
if vmiExists {
vmi = obj.(*virtv1.VirtualMachineInstance)
} else {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
log.DefaultLogger().Reason(err).Error("Could not extract namespace and name from the controller key.")
return err
}
vmi = virtv1.NewVMIReferenceFromNameWithNS(namespace, name)
}
// Only consider pdbs which belong to this vmi
pdbs, err := pdbs.PDBsForVMI(vmi, c.pdbInformer)
if err != nil {
log.DefaultLogger().Reason(err).Error("Failed to fetch pod disruption budgets for namespace from cache.")
// If the situation does not change there is no benefit in retrying
return nil
}
if len(pdbs) == 0 {
return c.sync(key, vmiExists, vmi, nil)
}
for i := range pdbs {
if syncErr := c.sync(key, vmiExists, vmi, pdbs[i]); syncErr != nil {
err = syncErr
}
}
return err
}
func (c *DisruptionBudgetController) isMigrationComplete(vmi *virtv1.VirtualMachineInstance, migrationName string) (bool, error) {
objs, err := c.migrationInformer.GetIndexer().ByIndex(cache.NamespaceIndex, vmi.Namespace)
if err != nil {
return false, err
}
var migration *virtv1.VirtualMachineInstanceMigration
for _, obj := range objs {
vmim := obj.(*virtv1.VirtualMachineInstanceMigration)
if vmim.GetName() == migrationName {
migration = vmim
break
}
}
if migration == nil {
// if no migration is found we consider it as completed
return true, nil
} else if !migration.IsFinal() {
return false, nil
}
runningPods := controller.VMIActivePodsCount(vmi, c.podInformer)
return runningPods == 1, nil
}
func (c *DisruptionBudgetController) isVMIMCompletedForPDB(pdb *policyv1.PodDisruptionBudget, vmi *virtv1.VirtualMachineInstance) (bool, error) {
migrationName := pdb.ObjectMeta.Labels[virtv1.MigrationNameLabel]
if migrationName == "" {
return false, nil
}
return c.isMigrationComplete(vmi, migrationName)
}
func (c *DisruptionBudgetController) deletePDB(key string, pdb *policyv1.PodDisruptionBudget, vmi *virtv1.VirtualMachineInstance) error {
if pdb != nil && pdb.DeletionTimestamp == nil {
pdbKey, err := cache.MetaNamespaceKeyFunc(pdb)
if err != nil {
return err
}
c.podDisruptionBudgetExpectations.ExpectDeletions(key, []string{pdbKey})
err = c.clientset.PolicyV1().PodDisruptionBudgets(pdb.Namespace).Delete(context.Background(), pdb.Name, v1.DeleteOptions{})
if err != nil {
c.podDisruptionBudgetExpectations.DeletionObserved(key, pdbKey)
c.recorder.Eventf(vmi, corev1.EventTypeWarning, FailedDeletePodDisruptionBudgetReason, "Error deleting the PodDisruptionBudget %s: %v", pdb.Name, err)
return err
}
c.recorder.Eventf(vmi, corev1.EventTypeNormal, SuccessfulDeletePodDisruptionBudgetReason, "Deleted PodDisruptionBudget %s", pdb.Name)
}
return nil
}
func (c *DisruptionBudgetController) shrinkPDB(vmi *virtv1.VirtualMachineInstance, pdb *policyv1.PodDisruptionBudget) error {
if pdb != nil && pdb.DeletionTimestamp == nil && pdb.Spec.MinAvailable.IntValue() != 1 {
patchOps := []byte(fmt.Sprintf(`[{ "op": "replace", "path": "/spec/minAvailable", "value": 1 }, { "op": "remove", "path": "/metadata/labels/%s" }]`,
patch.EscapeJSONPointer(virtv1.MigrationNameLabel)))
_, err := c.clientset.PolicyV1().PodDisruptionBudgets(pdb.Namespace).Patch(context.Background(), pdb.Name, types.JSONPatchType, patchOps, v1.PatchOptions{})
if err != nil {
c.recorder.Eventf(vmi, corev1.EventTypeWarning, FailedUpdatePodDisruptionBudgetReason, "Error updating the PodDisruptionBudget %s: %v", pdb.Name, err)
return err
}
c.recorder.Eventf(vmi, corev1.EventTypeNormal, SuccessfulUpdatePodDisruptionBudgetReason, "shrank PodDisruptionBudget %s", pdb.Name)
}
return nil
}
func (c *DisruptionBudgetController) createPDB(key string, vmi *virtv1.VirtualMachineInstance) error {
minAvailable := intstr.FromInt(1)
c.podDisruptionBudgetExpectations.ExpectCreations(key, 1)
createdPDB, err := c.clientset.PolicyV1().PodDisruptionBudgets(vmi.Namespace).Create(context.Background(), &policyv1.PodDisruptionBudget{
ObjectMeta: v1.ObjectMeta{
OwnerReferences: []v1.OwnerReference{
*v1.NewControllerRef(vmi, virtv1.VirtualMachineInstanceGroupVersionKind),
},
GenerateName: "kubevirt-disruption-budget-",
},
Spec: policyv1.PodDisruptionBudgetSpec{
MinAvailable: &minAvailable,
Selector: &v1.LabelSelector{
MatchLabels: map[string]string{
virtv1.CreatedByLabel: string(vmi.UID),
},
},
},
}, v1.CreateOptions{})
if err != nil {
c.podDisruptionBudgetExpectations.CreationObserved(key)
c.recorder.Eventf(vmi, corev1.EventTypeWarning, FailedCreatePodDisruptionBudgetReason, "Error creating a PodDisruptionBudget: %v", err)
return err
}
c.recorder.Eventf(vmi, corev1.EventTypeNormal, SuccessfulCreatePodDisruptionBudgetReason, "Created PodDisruptionBudget %s", createdPDB.Name)
return nil
}
func isPDBFromOldVMI(vmi *virtv1.VirtualMachineInstance, pdb *policyv1.PodDisruptionBudget) bool {
// The pdb might be from an old vmi with a different uid, delete and later create the correct one
// The VMI always has a minimum grace period, so normally this should not happen, therefore no optimizations
if pdb == nil {
return false
}
ownerRef := v1.GetControllerOf(pdb)
return ownerRef != nil && ownerRef.UID != vmi.UID
}
func (c *DisruptionBudgetController) sync(key string, vmiExists bool, vmi *virtv1.VirtualMachineInstance, pdb *policyv1.PodDisruptionBudget) error {
needsEvictionProtection := c.vmiNeedsEvictionPDB(vmiExists, vmi)
// check for deletions if pod exists
if pdb != nil {
if !vmiExists || vmi.DeletionTimestamp != nil {
// being deleted
log.Log.Infof("deleting pdb %s/%s due to VMI deletion", pdb.Namespace, pdb.Name)
return c.deletePDB(key, pdb, vmi)
} else if !needsEvictionProtection {
// vmi isn't set to prevent eviction, so delete the pdb
log.Log.Object(vmi).Infof("deleting pdb %s/%s due to not using evictionStrategy: LiveMigration|External", pdb.Namespace, pdb.Name)
return c.deletePDB(key, pdb, vmi)
} else if isPDBFromOldVMI(vmi, pdb) {
// pdb for non existent vmi
log.Log.Object(vmi).Infof("deleting pdb %s/%s due to VMI not existing anymore", pdb.Namespace, pdb.Name)
return c.deletePDB(key, pdb, vmi)
} else if pdbs.IsPDBFromOldMigrationController(pdb) {
// pdb coming from an old migration controller
log.Log.Object(vmi).Infof("deleting pdb %s/%s generated by an old migration controller", pdb.Namespace, pdb.Name)
return c.deletePDB(key, pdb, vmi)
} else {
vmimCompleted, err := c.isVMIMCompletedForPDB(pdb, vmi)
if err != nil {
return err
}
if vmimCompleted {
// pdb for completed migration
log.Log.Object(vmi).Infof("shrinking pdb %s/%s due to migration completion", pdb.Namespace, pdb.Name)
return c.shrinkPDB(vmi, pdb)
}
}
} else if needsEvictionProtection {
// pdb doesn't exist, create if vmi's eviction strategy means it is protected during drain.
log.Log.Object(vmi).Infof("creating pdb for VMI %s/%s", vmi.Namespace, vmi.Name)
return c.createPDB(key, vmi)
}
return nil
}
func (c *DisruptionBudgetController) vmiNeedsEvictionPDB(vmiExists bool, vmi *virtv1.VirtualMachineInstance) bool {
if !vmiExists || vmi.DeletionTimestamp != nil {
return false
}
evictionStrategy := migrations.VMIEvictionStrategy(c.clusterConfig, vmi)
if evictionStrategy == nil {
return false
}
switch *evictionStrategy {
case virtv1.EvictionStrategyLiveMigrate, virtv1.EvictionStrategyExternal:
return true
case virtv1.EvictionStrategyLiveMigrateIfPossible:
return vmi.IsMigratable()
default:
return false
}
}