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rbd: Add support for rbd ROX PVC mounting

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if the PVC access mode is ReadOnlyMany
or single node readonly, mounting the rbd
device path to the staging path as readonly
to avoid the write operation.

If the PVC acccess mode is readonly, mapping
rbd images as readonly.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna 2020-04-16 20:17:43 +05:30 committed by mergify[bot]
parent da40d8e05e
commit 649aeb7aaf
5 changed files with 171 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
e2e/rbd.go
View File

@ -5,6 +5,8 @@ import (
"strings"
. "github.com/onsi/ginkgo" // nolint
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/test/e2e/framework"
e2elog "k8s.io/kubernetes/test/e2e/framework/log"
@ -602,6 +604,122 @@ var _ = Describe("RBD", func() {
createRBDStorageClass(f.ClientSet, f, nil, nil)
})
By("create ROX PVC clone and mount it to multiple pods", func() {
v, err := f.ClientSet.Discovery().ServerVersion()
if err != nil {
e2elog.Logf("failed to get server version with error %v", err)
Fail(err.Error())
}
// snapshot beta is only supported from v1.17+
if v.Major > "1" || (v.Major == "1" && v.Minor >= "17") {
// create pvc and bind it to an app
pvc, err := loadPVC(pvcPath)
if err != nil {
Fail(err.Error())
}
pvc.Namespace = f.UniqueName
app, err := loadApp(appPath)
if err != nil {
Fail(err.Error())
}
app.Namespace = f.UniqueName
err = createPVCAndApp("", f, pvc, app, deployTimeout)
if err != nil {
Fail(err.Error())
}
// delete pod as we should not create snapshot for in-use pvc
err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
if err != nil {
Fail(err.Error())
}
snap := getSnapshot(snapshotPath)
snap.Namespace = f.UniqueName
snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
err = createSnapshot(&snap, deployTimeout)
if err != nil {
Fail(err.Error())
}
pvcClone, err := loadPVC(pvcClonePath)
if err != nil {
Fail(err.Error())
}
// create clone PVC as ROX
pvcClone.Namespace = f.UniqueName
pvcClone.Spec.AccessModes = []v1.PersistentVolumeAccessMode{v1.ReadOnlyMany}
err = createPVCAndvalidatePV(f.ClientSet, pvcClone, deployTimeout)
if err != nil {
Fail(err.Error())
}
appClone, err := loadApp(appClonePath)
if err != nil {
Fail(err.Error())
}
totalCount := 4
appClone.Namespace = f.UniqueName
appClone.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = pvcClone.Name
// create pvc and app
for i := 0; i < totalCount; i++ {
name := fmt.Sprintf("%s%d", f.UniqueName, i)
label := map[string]string{
"app": name,
}
appClone.Labels = label
appClone.Name = name
err = createApp(f.ClientSet, appClone, deployTimeout)
if err != nil {
Fail(err.Error())
}
}
for i := 0; i < totalCount; i++ {
name := fmt.Sprintf("%s%d", f.UniqueName, i)
opt := metav1.ListOptions{
LabelSelector: fmt.Sprintf("app=%s", name),
}
filePath := appClone.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
_, stdErr := execCommandInPodAndAllowFail(f, fmt.Sprintf("echo 'Hello World' > %s", filePath), appClone.Namespace, &opt)
readOnlyErr := fmt.Sprintf("cannot create %s: Read-only file system", filePath)
if !strings.Contains(stdErr, readOnlyErr) {
Fail(stdErr)
}
}
// delete app
for i := 0; i < totalCount; i++ {
name := fmt.Sprintf("%s%d", f.UniqueName, i)
appClone.Name = name
err = deletePod(appClone.Name, appClone.Namespace, f.ClientSet, deployTimeout)
if err != nil {
Fail(err.Error())
}
}
// delete pvc clone
err = deletePVCAndValidatePV(f.ClientSet, pvcClone, deployTimeout)
if err != nil {
Fail(err.Error())
}
// delete snapshot
err = deleteSnapshot(&snap, deployTimeout)
if err != nil {
Fail(err.Error())
}
// delete parent pvc
err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)
if err != nil {
Fail(err.Error())
}
}
})
// Make sure this should be last testcase in this file, because
// it deletes pool
By("Create a PVC and Delete PVC when backend pool deleted", func() {

10
internal/csi-common/nodeserver-default.go
View File

@ -194,3 +194,13 @@ func ConstructMountOptions(mountOptions []string, volCap *csi.VolumeCapability)
}
return mountOptions
}
// MountOptionContains checks the opt is present in mountOptions
func MountOptionContains(mountOptions []string, opt string) bool {
for _, mnt := range mountOptions {
if mnt == opt {
return true
}
}
return false
}

57
internal/rbd/nodeserver.go
View File

@ -204,7 +204,7 @@ func (ns *NodeServer) stageTransaction(ctx context.Context, req *csi.NodeStageVo
transaction := stageTransaction{}
var err error
var readOnly bool
var cr *util.Credentials
cr, err = util.NewUserCredentials(req.GetSecrets())
if err != nil {
@ -219,6 +219,13 @@ func (ns *NodeServer) stageTransaction(ctx context.Context, req *csi.NodeStageVo
}
defer volOptions.Destroy()
// Allow image to be mounted on multiple nodes if it is ROX
if req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY {
klog.V(3).Infof(util.Log(ctx, "setting disableInUseChecks on rbd volume to: %v"), req.GetVolumeId)
volOptions.DisableInUseChecks = true
volOptions.readOnly = true
}
// Mapping RBD image
var devicePath string
devicePath, err = attachRBDImage(ctx, volOptions, cr)
@ -248,15 +255,16 @@ func (ns *NodeServer) stageTransaction(ctx context.Context, req *csi.NodeStageVo
transaction.isStagePathCreated = true
// nodeStage Path
err = ns.mountVolumeToStagePath(ctx, req, staticVol, stagingTargetPath, devicePath)
readOnly, err = ns.mountVolumeToStagePath(ctx, req, staticVol, stagingTargetPath, devicePath)
if err != nil {
return transaction, err
}
transaction.isMounted = true
// #nosec - allow anyone to write inside the target path
err = os.Chmod(stagingTargetPath, 0777)
if !readOnly {
// #nosec - allow anyone to write inside the target path
err = os.Chmod(stagingTargetPath, 0777)
}
return transaction, err
}
@ -388,7 +396,8 @@ func getLegacyVolumeName(mountPath string) (string, error) {
return volName, nil
}
func (ns *NodeServer) mountVolumeToStagePath(ctx context.Context, req *csi.NodeStageVolumeRequest, staticVol bool, stagingPath, devicePath string) error {
func (ns *NodeServer) mountVolumeToStagePath(ctx context.Context, req *csi.NodeStageVolumeRequest, staticVol bool, stagingPath, devicePath string) (bool, error) {
readOnly := false
fsType := req.GetVolumeCapability().GetMount().GetFsType()
diskMounter := &mount.SafeFormatAndMount{Interface: ns.mounter, Exec: utilexec.New()}
// rbd images are thin-provisioned and return zeros for unwritten areas. A freshly created
@ -404,10 +413,29 @@ func (ns *NodeServer) mountVolumeToStagePath(ctx context.Context, req *csi.NodeS
existingFormat, err := diskMounter.GetDiskFormat(devicePath)
if err != nil {
klog.Errorf(util.Log(ctx, "failed to get disk format for path %s, error: %v"), devicePath, err)
return err
return readOnly, err
}
if existingFormat == "" && !staticVol {
opt := []string{"_netdev"}
opt = csicommon.ConstructMountOptions(opt, req.GetVolumeCapability())
isBlock := req.GetVolumeCapability().GetBlock() != nil
rOnly := "ro"
if req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY ||
req.VolumeCapability.AccessMode.Mode == csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY {
if !csicommon.MountOptionContains(opt, rOnly) {
opt = append(opt, rOnly)
}
}
if csicommon.MountOptionContains(opt, rOnly) {
readOnly = true
}
if fsType == "xfs" {
opt = append(opt, "nouuid")
}
if existingFormat == "" && !staticVol && !readOnly {
args := []string{}
if fsType == "ext4" {
args = []string{"-m0", "-Enodiscard,lazy_itable_init=1,lazy_journal_init=1", devicePath}
@ -417,19 +445,12 @@ func (ns *NodeServer) mountVolumeToStagePath(ctx context.Context, req *csi.NodeS
if len(args) > 0 {
cmdOut, cmdErr := diskMounter.Exec.Command("mkfs."+fsType, args...).CombinedOutput()
if cmdErr != nil {
klog.Errorf(util.Log(ctx, "failed to run mkfs error: %v, output: %v"), cmdErr, cmdOut)
return cmdErr
klog.Errorf(util.Log(ctx, "failed to run mkfs error: %v, output: %v"), cmdErr, string(cmdOut))
return readOnly, cmdErr
}
}
}
opt := []string{"_netdev"}
if fsType == "xfs" {
opt = append(opt, "nouuid")
}
opt = csicommon.ConstructMountOptions(opt, req.GetVolumeCapability())
isBlock := req.GetVolumeCapability().GetBlock() != nil
if isBlock {
opt = append(opt, "bind")
err = diskMounter.Mount(devicePath, stagingPath, fsType, opt)
@ -445,7 +466,7 @@ func (ns *NodeServer) mountVolumeToStagePath(ctx context.Context, req *csi.NodeS
req.GetVolumeId(),
err)
}
return err
return readOnly, err
}
func (ns *NodeServer) mountVolume(ctx context.Context, stagingPath string, req *csi.NodePublishVolumeRequest) error {

3
internal/rbd/rbd_attach.go
View File

@ -225,6 +225,9 @@ func createPath(ctx context.Context, volOpt *rbdVolume, cr *util.Credentials) (s
// Update options with device type selection
mapOptions = append(mapOptions, "--device-type", accessType)
if volOpt.readOnly {
mapOptions = append(mapOptions, "--read-only")
}
// Execute map
output, err := execCommand(rbd, mapOptions)
if err != nil {

1
internal/rbd/rbd_util.go
View File

@ -100,6 +100,7 @@ type rbdVolume struct {
VolSize int64 `json:"volSize"`
DisableInUseChecks bool `json:"disableInUseChecks"`
Encrypted bool
readOnly bool
KMS util.EncryptionKMS
// conn is a connection to the Ceph cluster obtained from a ConnPool