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Add code to handle in-tree to CSI migration for resizing

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This commit is contained in:
Hemant Kumar
2019-05-16 17:42:16 -04:00
parent 46a80259f6
commit 405d33eae4
6 changed files with 166 additions and 11 deletions
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67
pkg/controller/volume/expand/expand_controller.go
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@@ -30,14 +30,19 @@ import (
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
coreinformers "k8s.io/client-go/informers/core/v1"
storageclassinformer "k8s.io/client-go/informers/storage/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
storagelisters "k8s.io/client-go/listers/storage/v1"
"k8s.io/client-go/tools/cache"
kcache "k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
cloudprovider "k8s.io/cloud-provider"
csitranslation "k8s.io/csi-translation-lib"
v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/volume/events"
"k8s.io/kubernetes/pkg/util/mount"
@@ -72,6 +77,10 @@ type expandController struct {
pvLister corelisters.PersistentVolumeLister
pvSynced kcache.InformerSynced
// storageClass lister for fetching provisioner name
classLister storagelisters.StorageClassLister
classListerSynced cache.InformerSynced
// cloud provider used by volume host
cloud cloudprovider.Interface
@@ -90,17 +99,20 @@ func NewExpandController(
kubeClient clientset.Interface,
pvcInformer coreinformers.PersistentVolumeClaimInformer,
pvInformer coreinformers.PersistentVolumeInformer,
scInformer storageclassinformer.StorageClassInformer,
cloud cloudprovider.Interface,
plugins []volume.VolumePlugin) (ExpandController, error) {
expc := &expandController{
kubeClient: kubeClient,
cloud: cloud,
pvcLister: pvcInformer.Lister(),
pvcsSynced: pvcInformer.Informer().HasSynced,
pvLister: pvInformer.Lister(),
pvSynced: pvInformer.Informer().HasSynced,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "volume_expand"),
kubeClient: kubeClient,
cloud: cloud,
pvcLister: pvcInformer.Lister(),
pvcsSynced: pvcInformer.Informer().HasSynced,
pvLister: pvInformer.Lister(),
pvSynced: pvInformer.Informer().HasSynced,
classLister: scInformer.Lister(),
classListerSynced: scInformer.Informer().HasSynced,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "volume_expand"),
}
if err := expc.volumePluginMgr.InitPlugins(plugins, nil, expc); err != nil {
@@ -201,14 +213,29 @@ func (expc *expandController) syncHandler(key string) error {
klog.V(5).Infof("Error getting Persistent Volume for PVC %q (uid: %q) from informer : %v", util.GetPersistentVolumeClaimQualifiedName(pvc), pvc.UID, err)
return err
}
if pv.Spec.ClaimRef == nil || pvc.Namespace != pv.Spec.ClaimRef.Namespace || pvc.UID != pv.Spec.ClaimRef.UID {
err := fmt.Errorf("persistent Volume is not bound to PVC being updated : %s", util.ClaimToClaimKey(pvc))
klog.V(4).Infof("%v", err)
return err
}
claimClass := v1helper.GetPersistentVolumeClaimClass(pvc)
if claimClass == "" {
klog.V(4).Infof("volume expansion is disabled for PVC without StorageClasses: %s", util.ClaimToClaimKey(pvc))
return nil
}
class, err := expc.classLister.Get(claimClass)
if err != nil {
klog.V(4).Infof("volume expansion is not supported for PVC: %s, can not find StorageClass %s", util.ClaimToClaimKey(pvc), claimClass)
return nil
}
volumeSpec := volume.NewSpecFromPersistentVolume(pv, false)
volumePlugin, err := expc.volumePluginMgr.FindExpandablePluginBySpec(volumeSpec)
volumeResizerName := class.Provisioner
if err != nil || volumePlugin == nil {
msg := fmt.Errorf("didn't find a plugin capable of expanding the volume; " +
"waiting for an external controller to process this PVC")
@@ -221,11 +248,31 @@ func (expc *expandController) syncHandler(key string) error {
return err
}
return expc.expand(pvc, pv)
if volumePlugin.IsMigratedToCSI() {
msg := fmt.Sprintf("CSI migration enabled for %s; waiting for external resizer to expand the pvc", volumeResizerName)
expc.recorder.Event(pvc, v1.EventTypeNormal, events.ExternalExpanding, msg)
csiResizerName, err := csitranslation.GetCSINameFromInTreeName(class.Provisioner)
if err != nil {
errorMsg := fmt.Sprintf("error getting CSI driver name for pvc %s, with error %v", util.ClaimToClaimKey(pvc), err)
expc.recorder.Event(pvc, v1.EventTypeWarning, events.ExternalExpanding, errorMsg)
return fmt.Errorf(errorMsg)
}
pvc, err := util.SetClaimResizer(pvc, csiResizerName, expc.kubeClient)
if err != nil {
errorMsg := fmt.Sprintf("error setting resizer annotation to pvc %s, with error %v", util.ClaimToClaimKey(pvc), err)
expc.recorder.Event(pvc, v1.EventTypeWarning, events.ExternalExpanding, errorMsg)
return fmt.Errorf(errorMsg)
}
return nil
}
return expc.expand(pvc, pv, volumeResizerName)
}
func (expc *expandController) expand(pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume) error {
pvc, err := util.MarkResizeInProgress(pvc, expc.kubeClient)
func (expc *expandController) expand(pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume, resizerName string) error {
pvc, err := util.MarkResizeInProgressWithResizer(pvc, resizerName, expc.kubeClient)
if err != nil {
klog.V(5).Infof("Error setting PVC %s in progress with error : %v", util.GetPersistentVolumeClaimQualifiedName(pvc), err)
return err