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Merge pull request #65499 from krunaljain/bugfix/csi_default_fs_type 

Automatic merge from submit-queue (batch tested with PRs 55023, 65499). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Bugfix/csi default fs type

This PR address the issue mentioned in the following ticket https://github.com/kubernetes/kubernetes/issues/65122 
The FSType string will now not be defaulted to ext4. Removes defaulting of CSI file system type to ext4. CSI plugins that depended on this default need to be updated as the fsType would remain an empty string if not provided and would not default to ext4. CSI spec allows for an empty fstype string. This is intended for non-block plugins like nfs and gluster where filesystems are not separately created on the volume. But currently the default file system is overridden to ext4  which makes the above case redundant. This commit prevents such an overridding. 


```release-note  
ACTION REQUIRED: Removes defaulting of CSI file system type to ext4. All the production drivers listed under https://kubernetes-csi.github.io/docs/Drivers.html were tested and work as expected after this change. If you are using a driver not in that list, please test the drivers on an updated test cluster first. ```
pull/8/head
Kubernetes Submit Queue 2018-07-10 10:18:08 -07:00 committed by GitHub
parent a3f01ada71 fb28a1dd28
commit 3b269e182d
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26 changed files with 29 additions and 32 deletions
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2
api/openapi-spec/swagger.json generated
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@ -80944,7 +80944,7 @@
],
"properties": {
"fsType": {
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd",
"type": "string"
},
"image": {

2
api/swagger-spec/apps_v1.json generated
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@ -7182,7 +7182,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/apps_v1beta1.json generated
View File

@ -4816,7 +4816,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/apps_v1beta2.json generated
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@ -7182,7 +7182,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
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@ -2156,7 +2156,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
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@ -2211,7 +2211,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/batch_v2alpha1.json generated
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@ -2211,7 +2211,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/extensions_v1beta1.json generated
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@ -7824,7 +7824,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/settings.k8s.io_v1alpha1.json generated
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@ -1987,7 +1987,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
api/swagger-spec/v1.json generated
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@ -20682,7 +20682,7 @@
},
"fsType": {
"type": "string",
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
"description": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd"
},
"pool": {
"type": "string",

2
docs/api-reference/apps/v1/definitions.html generated
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@ -4446,7 +4446,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/apps/v1beta1/definitions.html generated
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@ -4609,7 +4609,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/apps/v1beta2/definitions.html generated
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@ -5046,7 +5046,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/batch/v1/definitions.html generated
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@ -3710,7 +3710,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/batch/v1beta1/definitions.html generated
View File

@ -3820,7 +3820,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/batch/v2alpha1/definitions.html generated
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@ -3717,7 +3717,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/extensions/v1beta1/definitions.html generated
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@ -5179,7 +5179,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/settings.k8s.io/v1alpha1/definitions.html generated
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@ -4093,7 +4093,7 @@ Examples:<br>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
docs/api-reference/v1/definitions.html generated
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@ -9990,7 +9990,7 @@ More info: <a href="https://kubernetes.io/docs/concepts/workloads/pods/pod-lifec
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">fsType</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified. More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: "ext4", "xfs", "ntfs". More info: <a href="https://kubernetes.io/docs/concepts/storage/volumes#rbd">https://kubernetes.io/docs/concepts/storage/volumes#rbd</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
<td class="tableblock halign-left valign-top"></td>

2
pkg/apis/core/types.go
View File

@ -575,7 +575,7 @@ type GCEPersistentDiskVolumeSource struct {
PDName string
// Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
// Ex. "ext4", "xfs", "ntfs".
// TODO: how do we prevent errors in the filesystem from compromising the machine
// +optional
FSType string

4
pkg/volume/csi/csi_attacher.go
View File

@ -354,10 +354,6 @@ func (c *csiAttacher) MountDevice(spec *volume.Spec, devicePath string, deviceMo
}
fsType := csiSource.FSType
if len(fsType) == 0 {
fsType = defaultFSType
}
err = csi.NodeStageVolume(ctx,
csiSource.VolumeHandle,
publishVolumeInfo,

5
pkg/volume/csi/csi_mounter.go
View File

@ -34,8 +34,6 @@ import (
"k8s.io/kubernetes/pkg/volume/util"
)
const defaultFSType = "ext4"
//TODO (vladimirvivien) move this in a central loc later
var (
volDataKey = struct {
@ -177,9 +175,6 @@ func (c *csiMountMgr) SetUpAt(dir string, fsGroup *int64) error {
}
fsType := csiSource.FSType
if len(fsType) == 0 {
fsType = defaultFSType
}
err = csi.NodePublishVolume(
ctx,
c.volumeID,

6
pkg/volume/csi/csi_mounter_test.go
View File

@ -144,6 +144,12 @@ func TestMounterSetUp(t *testing.T) {
if err := csiMounter.SetUp(&fsGroup); err != nil {
t.Fatalf("mounter.Setup failed: %v", err)
}
//Test the default value of file system type is not overridden
if len(csiMounter.spec.PersistentVolume.Spec.CSI.FSType) != 0 {
t.Errorf("default value of file system type was overridden by type %s", csiMounter.spec.PersistentVolume.Spec.CSI.FSType)
}
path := csiMounter.GetPath()
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {

2
staging/src/k8s.io/api/core/v1/generated.proto
View File

@ -3432,7 +3432,7 @@ message RBDVolumeSource {
// Filesystem type of the volume that you want to mount.
// Tip: Ensure that the filesystem type is supported by the host operating system.
// Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
// Examples: "ext4", "xfs", "ntfs".
// More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd
// TODO: how do we prevent errors in the filesystem from compromising the machine
// +optional

2
staging/src/k8s.io/api/core/v1/types.go
View File

@ -635,7 +635,7 @@ type RBDVolumeSource struct {
RBDImage string `json:"image" protobuf:"bytes,2,opt,name=image"`
// Filesystem type of the volume that you want to mount.
// Tip: Ensure that the filesystem type is supported by the host operating system.
// Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
// Examples: "ext4", "xfs", "ntfs".
// More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd
// TODO: how do we prevent errors in the filesystem from compromising the machine
// +optional

2
staging/src/k8s.io/api/core/v1/types_swagger_doc_generated.go generated
View File

@ -1688,7 +1688,7 @@ var map_RBDVolumeSource = map[string]string{
"": "Represents a Rados Block Device mount that lasts the lifetime of a pod. RBD volumes support ownership management and SELinux relabeling.",
"monitors": "A collection of Ceph monitors. More info: https://releases.k8s.io/HEAD/examples/volumes/rbd/README.md#how-to-use-it",
"image": "The rados image name. More info: https://releases.k8s.io/HEAD/examples/volumes/rbd/README.md#how-to-use-it",
"fsType": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". Implicitly inferred to be \"ext4\" if unspecified. More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd",
"fsType": "Filesystem type of the volume that you want to mount. Tip: Ensure that the filesystem type is supported by the host operating system. Examples: \"ext4\", \"xfs\", \"ntfs\". More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd",
"pool": "The rados pool name. Default is rbd. More info: https://releases.k8s.io/HEAD/examples/volumes/rbd/README.md#how-to-use-it",
"user": "The rados user name. Default is admin. More info: https://releases.k8s.io/HEAD/examples/volumes/rbd/README.md#how-to-use-it",
"keyring": "Keyring is the path to key ring for RBDUser. Default is /etc/ceph/keyring. More info: https://releases.k8s.io/HEAD/examples/volumes/rbd/README.md#how-to-use-it",