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Send recycle events from pod to pv.

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This allows users to diagnose what's wrong with recycler. Recycler pods are
started automatically with a cryptic name and they are deleted immediately
when they finish.

kubectl describe pods will show:

  FirstSeen     LastSeen        Count   From                            SubobjectPath   Type            Reason          Message
  ---------     --------        -----   ----                            -------------   --------        ------          -------
  59m           59m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(5421800e-347b-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  53m           53m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(3c9809e5-347c-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  46m           46m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(250dd2a2-347d-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  40m           40m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(0d84ea33-347e-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  33m           33m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(f5fb63bf-347e-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  27m           27m             1       {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Unable to mount volumes for pod "recycler-for-nfs_default(de7128fd-347f-11e6-a79b-3c970e965218)": timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  1h            3m              75      {persistentvolume-controller }                  Normal          RecyclerPod     Recycler pod: Successfully assigned recycler-for-nfs to 127.0.0.1
  1h            3m              76      {persistentvolume-controller }                  Normal          RecyclerPod     Recycler pod: Pod was active on the node longer than specified deadline
  1h            1m              12      {persistentvolume-controller }                  Warning         RecyclerPod     Recycler pod: Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "recycler-for-nfs"/"default". list of unattached/unmounted volumes=[vol]
  20m           1m              4       {persistentvolume-controller }                  Warning         RecyclerPod     (events with common reason combined)


These steps were necessary:

- added event watcher to volume.RecycleVolumeByWatchingPodUntilCompletion

- pass all these events through volume plugins to volume controller

- rework volume.RecycleVolumeByWatchingPodUntilCompletion unit tests to a table
  (too much copy-paste)

- fix all unit tests along the way
This commit is contained in:
Jan Safranek
2016-09-08 12:57:57 +02:00
parent bf4e9e9db8
commit d7111b282f
10 changed files with 344 additions and 163 deletions
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9
pkg/volume/plugins.go
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@@ -124,9 +124,12 @@ type PersistentVolumePlugin interface {
// again to new claims
type RecyclableVolumePlugin interface {
VolumePlugin
// NewRecycler creates a new volume.Recycler which knows how to reclaim
// this resource after the volume's release from a PersistentVolumeClaim
NewRecycler(pvName string, spec *Spec) (Recycler, error)
// NewRecycler creates a new volume.Recycler which knows how to reclaim this
// resource after the volume's release from a PersistentVolumeClaim. The
// recycler will use the provided recorder to write any events that might be
// interesting to user. It's expected that caller will pass these events to
// the PV being recycled.
NewRecycler(pvName string, spec *Spec, eventRecorder RecycleEventRecorder) (Recycler, error)
}
// DeletableVolumePlugin is an extended interface of VolumePlugin and is used