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Merge pull request #80476 from matte21/fix-pvcs-leaks

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PVC protection controller: fix PVC leaks
This commit is contained in:
Kubernetes Prow Robot 2019-07-26 05:31:59 -07:00 committed by GitHub
commit d5d6061c8e
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3 changed files with 93 additions and 19 deletions
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1
pkg/controller/volume/pvcprotection/BUILD
View File

@ -38,6 +38,7 @@ go_test(
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
"//staging/src/k8s.io/client-go/informers:go_default_library",
"//staging/src/k8s.io/client-go/kubernetes/fake:go_default_library",
"//staging/src/k8s.io/client-go/testing:go_default_library",

37
pkg/controller/volume/pvcprotection/pvc_protection_controller.go
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@ -20,7 +20,7 @@ import (
"fmt"
"time"
"k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
@ -79,13 +79,13 @@ func NewPVCProtectionController(pvcInformer coreinformers.PersistentVolumeClaimI
e.podListerSynced = podInformer.Informer().HasSynced
podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
e.podAddedDeletedUpdated(obj, false)
e.podAddedDeletedUpdated(nil, obj, false)
},
DeleteFunc: func(obj interface{}) {
e.podAddedDeletedUpdated(obj, true)
e.podAddedDeletedUpdated(nil, obj, true)
},
UpdateFunc: func(old, new interface{}) {
e.podAddedDeletedUpdated(new, false)
e.podAddedDeletedUpdated(old, new, false)
},
})
@ -257,27 +257,48 @@ func (c *Controller) pvcAddedUpdated(obj interface{}) {
}
// podAddedDeletedUpdated reacts to Pod events
func (c *Controller) podAddedDeletedUpdated(obj interface{}, deleted bool) {
func (c *Controller) podAddedDeletedUpdated(old, new interface{}, deleted bool) {
if pod := c.parsePod(new); pod != nil {
c.enqueuePVCs(pod, deleted)
// An update notification might mask the deletion of a pod X and the
// following creation of a pod Y with the same namespaced name as X. If
// that's the case X needs to be processed as well to handle the case
// where it is blocking deletion of a PVC not referenced by Y, otherwise
// such PVC will never be deleted.
if oldPod := c.parsePod(old); oldPod != nil && oldPod.UID != pod.UID {
c.enqueuePVCs(oldPod, true)
}
}
}
func (*Controller) parsePod(obj interface{}) *v1.Pod {
if obj == nil {
return nil
}
pod, ok := obj.(*v1.Pod)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
utilruntime.HandleError(fmt.Errorf("Couldn't get object from tombstone %#v", obj))
return
return nil
}
pod, ok = tombstone.Obj.(*v1.Pod)
if !ok {
utilruntime.HandleError(fmt.Errorf("Tombstone contained object that is not a Pod %#v", obj))
return
return nil
}
}
return pod
}
func (c *Controller) enqueuePVCs(pod *v1.Pod, deleted bool) {
// Filter out pods that can't help us to remove a finalizer on PVC
if !deleted && !volumeutil.IsPodTerminated(pod, pod.Status) && pod.Spec.NodeName != "" {
return
}
klog.V(4).Infof("Got event on pod %s/%s", pod.Namespace, pod.Name)
klog.V(4).Infof("Enqueuing PVCs for Pod %s/%s (UID=%s)", pod.Namespace, pod.Name, pod.UID)
// Enqueue all PVCs that the pod uses
for _, volume := range pod.Spec.Volumes {

74
pkg/controller/volume/pvcprotection/pvc_protection_controller_test.go
View File

@ -24,12 +24,13 @@ import (
"github.com/davecgh/go-spew/spew"
"k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes/fake"
clienttesting "k8s.io/client-go/testing"
@ -49,6 +50,7 @@ const (
defaultPVCName = "pvc1"
defaultPodName = "pod1"
defaultNodeName = "node1"
defaultUID = "uid1"
)
func pod() *v1.Pod {
@ -56,6 +58,7 @@ func pod() *v1.Pod {
ObjectMeta: metav1.ObjectMeta{
Name: defaultPodName,
Namespace: defaultNS,
UID: defaultUID,
},
Spec: v1.PodSpec{
NodeName: defaultNodeName,
@ -100,6 +103,11 @@ func withStatus(phase v1.PodPhase, pod *v1.Pod) *v1.Pod {
return pod
}
func withUID(uid types.UID, pod *v1.Pod) *v1.Pod {
pod.ObjectMeta.UID = uid
return pod
}
func pvc() *v1.PersistentVolumeClaim {
return &v1.PersistentVolumeClaim{
ObjectMeta: metav1.ObjectMeta{
@ -152,13 +160,13 @@ func TestPVCProtectionController(t *testing.T) {
// Optional client reactors.
reactors []reaction
// PVC event to simulate. This PVC will be automatically added to
// initalObjects.
// initialObjects.
updatedPVC *v1.PersistentVolumeClaim
// Pod event to simulate. This Pod will be automatically added to
// initalObjects.
// initialObjects.
updatedPod *v1.Pod
// Pod event to similate. This Pod is *not* added to
// initalObjects.
// Pod event to simulate. This Pod is *not* added to
// initialObjects.
deletedPod *v1.Pod
// List of expected kubeclient actions that should happen during the
// test.
@ -177,7 +185,7 @@ func TestPVCProtectionController(t *testing.T) {
storageObjectInUseProtectionEnabled: true,
},
{
name: "StorageObjectInUseProtection Disabled, PVC without finalizer -> finalizer is added",
name: "StorageObjectInUseProtection Disabled, PVC without finalizer -> finalizer is not added",
updatedPVC: pvc(),
expectedActions: []clienttesting.Action{},
storageObjectInUseProtectionEnabled: false,
@ -315,6 +323,48 @@ func TestPVCProtectionController(t *testing.T) {
},
storageObjectInUseProtectionEnabled: true,
},
{
name: "pod delete and create with same namespaced name seen as an update, old pod used deleted PVC -> finalizer is removed",
initialObjects: []runtime.Object{
deleted(withProtectionFinalizer(pvc())),
},
deletedPod: withPVC(defaultPVCName, pod()),
updatedPod: withUID("uid2", pod()),
expectedActions: []clienttesting.Action{
clienttesting.NewUpdateAction(pvcVer, defaultNS, deleted(pvc())),
},
storageObjectInUseProtectionEnabled: true,
},
{
name: "pod delete and create with same namespaced name seen as an update, old pod used non-deleted PVC -> finalizer is not removed",
initialObjects: []runtime.Object{
withProtectionFinalizer(pvc()),
},
deletedPod: withPVC(defaultPVCName, pod()),
updatedPod: withUID("uid2", pod()),
expectedActions: []clienttesting.Action{},
storageObjectInUseProtectionEnabled: true,
},
{
name: "pod delete and create with same namespaced name seen as an update, both pods reference deleted PVC -> finalizer is not removed",
initialObjects: []runtime.Object{
deleted(withProtectionFinalizer(pvc())),
},
deletedPod: withPVC(defaultPVCName, pod()),
updatedPod: withUID("uid2", withPVC(defaultPVCName, pod())),
expectedActions: []clienttesting.Action{},
storageObjectInUseProtectionEnabled: true,
},
{
name: "pod update from unscheduled to scheduled, deleted PVC is referenced -> finalizer is not removed",
initialObjects: []runtime.Object{
deleted(withProtectionFinalizer(pvc())),
},
deletedPod: unscheduled(withPVC(defaultPVCName, pod())),
updatedPod: withPVC(defaultPVCName, pod()),
expectedActions: []clienttesting.Action{},
storageObjectInUseProtectionEnabled: true,
},
}
for _, test := range tests {
@ -358,11 +408,13 @@ func TestPVCProtectionController(t *testing.T) {
if test.updatedPVC != nil {
ctrl.pvcAddedUpdated(test.updatedPVC)
}
if test.updatedPod != nil {
ctrl.podAddedDeletedUpdated(test.updatedPod, false)
}
if test.deletedPod != nil {
ctrl.podAddedDeletedUpdated(test.deletedPod, true)
switch {
case test.deletedPod != nil && test.updatedPod != nil && test.deletedPod.Namespace == test.updatedPod.Namespace && test.deletedPod.Name == test.updatedPod.Name:
ctrl.podAddedDeletedUpdated(test.deletedPod, test.updatedPod, false)
case test.updatedPod != nil:
ctrl.podAddedDeletedUpdated(nil, test.updatedPod, false)
case test.deletedPod != nil:
ctrl.podAddedDeletedUpdated(nil, test.deletedPod, true)
}
// Process the controller queue until we get expected results