fix(manager): fix logic for when RWX workload is restarted after node…

… failure

Signed-off-by: James Munson <james.munson@suse.com>

controller/kubernetes_pod_controller.go

@@ -209,19 +209,12 @@ func (kc *KubernetesPodController) handleWorkloadPodDeletionIfCSIPluginPodIsDown
 		return nil
 	}
 
-	storageNetworkSetting, err := kc.ds.GetSettingWithAutoFillingRO(types.SettingNameStorageNetwork)
+	isStorageNetworkForRWXVolume, err := kc.ds.IsStorageNetworkForRWXVolume()
 	if err != nil {
-		log.WithError(err).Warnf("%s. Failed to get setting %v", logAbort, types.SettingNameStorageNetwork)
+		log.WithError(err).Warnf("%s. Failed to check isStorageNetwork", logAbort)
 		return nil
 	}
-
-	storageNetworkForRWXVolumeEnabled, err := kc.ds.GetSettingAsBool(types.SettingNameStorageNetworkForRWXVolumeEnabled)
-	if err != nil {
-		log.WithError(err).Warnf("%s. Failed to get setting %v", logAbort, types.SettingNameStorageNetworkForRWXVolumeEnabled)
-		return nil
-	}
-
-	if !types.IsStorageNetworkForRWXVolume(storageNetworkSetting, storageNetworkForRWXVolumeEnabled) {
+	if !isStorageNetworkForRWXVolume {
 		return nil
 	}
 
@@ -476,6 +469,11 @@ func (kc *KubernetesPodController) handlePodDeletionIfVolumeRequestRemount(pod *
 		return err
 	}
 
+	isStorageNetworkForRWXVolume, err := kc.ds.IsStorageNetworkForRWXVolume()
+	if err != nil {
+		kc.logger.WithError(err).Warn("Failed to check isStorageNetwork, assuming not")
+	}
+
 	// Only delete pod which has startTime < vol.Status.RemountRequestAt AND timeNow > vol.Status.RemountRequestAt + delayDuration
 	// The delayDuration is to make sure that we don't repeatedly delete the pod too fast
 	// when vol.Status.RemountRequestAt is updated too quickly by volumeController
@@ -493,6 +491,13 @@ func (kc *KubernetesPodController) handlePodDeletionIfVolumeRequestRemount(pod *
 		if vol.Status.RemountRequestedAt == "" {
 			continue
 		}
+
+		// NFS clients can generally recover without a restart/remount when the NFS server restarts using the same Cluster IP.
+		// A remount is required when the storage network for RWX is in use because the new NFS server has a different IP.
+		if isRegularRWXVolume(vol) && !isStorageNetworkForRWXVolume {
+			continue
+		}
+
 		remountRequestedAt, err := time.Parse(time.RFC3339, vol.Status.RemountRequestedAt)
 		if err != nil {
 			return err

controller/share_manager_controller.go

@@ -451,7 +451,7 @@ func (c *ShareManagerController) syncShareManagerEndpoint(sm *longhorn.ShareMana
 		return nil
 	}
 
-	storageNetworkForRWXVolume, err := c.isStorageNetworkForRWXVolume()
+	storageNetworkForRWXVolume, err := c.ds.IsStorageNetworkForRWXVolume()
 	if err != nil {
 		return err
 	}
@@ -1045,20 +1045,6 @@ func (c *ShareManagerController) getShareManagerTolerationsFromStorageClass(sc *
 	return tolerations
 }
 
-func (c *ShareManagerController) isStorageNetworkForRWXVolume() (bool, error) {
-	storageNetwork, err := c.ds.GetSettingWithAutoFillingRO(types.SettingNameStorageNetwork)
-	if err != nil {
-		return false, errors.Wrapf(err, "failed to get setting value %v", types.SettingNameStorageNetwork)
-	}
-
-	storageNetworkForRWXVolumeEnabled, err := c.ds.GetSettingAsBool(types.SettingNameStorageNetworkForRWXVolumeEnabled)
-	if err != nil {
-		return false, errors.Wrapf(err, "failed to get setting value %v", types.SettingNameStorageNetworkForRWXVolumeEnabled)
-	}
-
-	return types.IsStorageNetworkForRWXVolume(storageNetwork, storageNetworkForRWXVolumeEnabled), nil
-}
-
 func (c *ShareManagerController) checkStorageNetworkApplied() (bool, error) {
 	targetSettings := []types.SettingName{types.SettingNameStorageNetwork, types.SettingNameStorageNetworkForRWXVolumeEnabled}
 	for _, item := range targetSettings {
@@ -1091,7 +1077,7 @@ func (c *ShareManagerController) canCleanupService(shareManagerName string) (boo
 		return false, nil
 	}
 
-	storageNetworkForRWXVolume, err := c.isStorageNetworkForRWXVolume()
+	storageNetworkForRWXVolume, err := c.ds.IsStorageNetworkForRWXVolume()
 	if err != nil {
 		return false, err
 	}
@@ -1362,7 +1348,7 @@ func (c *ShareManagerController) createServiceManifest(sm *longhorn.ShareManager
 
 	log := getLoggerForShareManager(c.logger, sm)
 
-	storageNetworkForRWXVolume, err := c.isStorageNetworkForRWXVolume()
+	storageNetworkForRWXVolume, err := c.ds.IsStorageNetworkForRWXVolume()
 	if err != nil {
 		log.WithError(err).Warnf("Failed to check storage network for RWX volume")
 	}

controller/volume_controller.go

@@ -4509,9 +4509,9 @@ func (c *VolumeController) ReconcileShareManagerState(volume *longhorn.Volume) e
 		log.Infof("Updated image for share manager from %v to %v", sm.Spec.Image, c.smImage)
 	}
 
-	// kill the workload pods, when the share manager goes into error state
-	// easiest approach is to set the RemountRequestedAt variable,
-	// since that is already responsible for killing the workload pods
+	// Give the workload pods a chance to restart when the share manager goes into error state.
+	// Easiest approach is to set the RemountRequestedAt variable.  Pods will make that decision
+	// in the kubernetes_pod_controller.
 	if sm.Status.State == longhorn.ShareManagerStateError || sm.Status.State == longhorn.ShareManagerStateUnknown {
 		volume.Status.RemountRequestedAt = c.nowHandler()
 		msg := fmt.Sprintf("Volume %v requested remount at %v", volume.Name, volume.Status.RemountRequestedAt)

datastore/longhorn.go

@@ -5576,3 +5576,17 @@ func (s *DataStore) IsPVMountOptionReadOnly(volume *longhorn.Volume) (bool, erro
 	}
 	return false, nil
 }
+
+func (s *DataStore) IsStorageNetworkForRWXVolume() (bool, error) {
+	storageNetworkSetting, err := s.GetSettingWithAutoFillingRO(types.SettingNameStorageNetwork)
+	if err != nil {
+		return false, errors.Wrapf(err, "Failed to get setting %v", types.SettingNameStorageNetwork)
+	}
+
+	storageNetworkForRWXVolumeEnabled, err := s.GetSettingAsBool(types.SettingNameStorageNetworkForRWXVolumeEnabled)
+	if err != nil {
+		return false, errors.Wrapf(err, "Failed to get setting %v", types.SettingNameStorageNetworkForRWXVolumeEnabled)
+	}
+
+	return types.IsStorageNetworkForRWXVolume(storageNetworkSetting, storageNetworkForRWXVolumeEnabled), nil
+}