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rbd: healer detect Kubernetes version for right StagingTargetPath

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Kubernetes 1.24 and newer use a different path for staging the volume.
That means the CSI-driver is requested to mount the volume at an other
location, compared to previous versions of Kubernetes. CSI-drivers
implementing the volumeHealer, must receive the correct path, otherwise
the after a nodeplugin restart the NBD mounts will bailout attempting
to NodeStageVolume() call and return an error.

See-also: kubernetes/kubernetes#107065

Fixes: #3176
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
(cherry picked from commit 1da446d2f2)
This commit is contained in:
Prasanna Kumar Kalever 2022-06-23 11:26:10 +05:30 committed by mergify[bot]
parent 471c1342b1
commit d18eaceab4
2 changed files with 33 additions and 2 deletions
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2
cmd/cephcsi.go
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@ -54,7 +54,7 @@ const (
defaultNS = "default"
defaultPluginPath = "/var/lib/kubelet/plugins"
defaultStagingPath = defaultPluginPath + "/kubernetes.io/csi/pv/"
defaultStagingPath = defaultPluginPath + "/kubernetes.io/csi/"
)
var conf util.Config

33
internal/rbd/rbd_healer.go
View File

@ -18,6 +18,9 @@ package rbd
import (
"context"
"crypto/sha256"
"fmt"
"path/filepath"
"sync"
"github.com/ceph/ceph-csi/internal/util"
@ -70,11 +73,39 @@ func getSecret(c *k8s.Clientset, ns, name string) (map[string]string, error) {
return deviceSecret, nil
}
// formatStagingTargetPath returns the path where the volume is expected to be
// mounted (or the block-device is attached/mapped). Different Kubernetes
// version use different paths.
func formatStagingTargetPath(c *k8s.Clientset, pv *v1.PersistentVolume, stagingPath string) (string, error) {
// Kubernetes 1.24+ uses a hash of the volume-id in the path name
unique := sha256.Sum256([]byte(pv.Spec.CSI.VolumeHandle))
targetPath := filepath.Join(stagingPath, pv.Spec.CSI.Driver, fmt.Sprintf("%x", unique), "globalmount")
major, minor, err := kubeclient.GetServerVersion(c)
if err != nil {
return "", fmt.Errorf("failed to get server version: %w", err)
}
// 'encode' major/minor in a single integer
legacyVersion := 1024 // Kubernetes 1.24 => 1 * 1000 + 24
if ((major * 1000) + minor) < (legacyVersion) {
// path in Kubernetes < 1.24
targetPath = filepath.Join(stagingPath, "pv", pv.Name, "globalmount")
}
return targetPath, nil
}
func callNodeStageVolume(ns *NodeServer, c *k8s.Clientset, pv *v1.PersistentVolume, stagingPath string) error {
publishContext := make(map[string]string)
volID := pv.Spec.PersistentVolumeSource.CSI.VolumeHandle
stagingParentPath := stagingPath + pv.Name + "/globalmount"
stagingParentPath, err := formatStagingTargetPath(c, pv, stagingPath)
if err != nil {
log.ErrorLogMsg("formatStagingTargetPath failed volID: %s, err: %v", volID, err)
return err
}
log.DefaultLog("sending nodeStageVolume for volID: %s, stagingPath: %s",
volID, stagingParentPath)