Revert "Add multiNodeWritable option for RBD Volumes"

This reverts commit b5b8e46460.

examples/README.md

@@ -114,167 +114,3 @@ To restore the snapshot to a new PVC, deploy
 kubectl create -f pvc-restore.yaml
 kubectl create -f pod-restore.yaml
 ```
-
-## How to enable multi node attach support for RBD
-
-*WARNING*  This feature is strictly for workloads that know how to deal
-with concurrent acces to the Volume (eg Active/Passive applications).
-Using RWX modes on non clustered file systems with applications trying
-to simultaneously access the Volume will likely result in data corruption!
-
-### Example process to test the multiNodeWritable feature
-
-Modify your current storage class, or create a new storage class specifically
-for multi node writers by adding the `multiNodeWritable: "enabled"` entry to
-your parameters.  Here's an example:
-
-```yaml
-apiVersion: storage.k8s.io/v1
-kind: StorageClass
-metadata:
-   name: csi-rbd
-provisioner: csi-rbdplugin
-parameters:
-    monitors: rook-ceph-mon-b.rook-ceph.svc.cluster.local:6789
-    pool: rbd
-    imageFormat: "2"
-    imageFeatures: layering
-    csiProvisionerSecretName: csi-rbd-secret
-    csiProvisionerSecretNamespace: default
-    csiNodePublishSecretName: csi-rbd-secret
-    csiNodePublishSecretNamespace: default
-    adminid: admin
-    userid: admin
-    fsType: xfs
-    multiNodeWritable: "enabled"
-reclaimPolicy: Delete
-```
-
-Now, you can request Claims from the configured storage class that include
-the `ReadWriteMany` access mode:
-
-```yaml
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: pvc-1
-spec:
-  accessModes:
-  - ReadWriteMany
-  resources:
-    requests:
-      storage: 1Gi
-  storageClassName: csi-rbd
-```
-
-Create a POD that uses this PVC:
-
-```yaml
-apiVersion: v1
-kind: Pod
-metadata:
-  name: test-1
-spec:
-  containers:
-   - name: web-server
-     image: nginx
-     volumeMounts:
-       - name: mypvc
-         mountPath: /var/lib/www/html
-  volumes:
-   - name: mypvc
-     persistentVolumeClaim:
-       claimName: pvc-1
-       readOnly: false
-```
-
-Wait for the POD to enter Running state, write some data to
-`/var/lib/www/html`
-
-Now, we can create a second POD (ensure the POD is scheduled on a different
-node; multiwriter single node works without this feature) that also uses this
-PVC at the same time
-
-```yaml
-apiVersion: v1
-kind: Pod
-metadata:
-  name: test-2
-spec:
-  containers:
-   - name: web-server
-     image: nginx
-     volumeMounts:
-       - name: mypvc
-         mountPath: /var/lib/www/html
-  volumes:
-   - name: mypvc
-     persistentVolumeClaim:
-       claimName: pvc-1
-       readOnly: false
-```
-
-If you access the pod you can check that your data is avaialable at
-`/var/lib/www/html`
-
-## Testing Raw Block feature in kubernetes with RBD volumes
-
-CSI block volume support is feature-gated and turned off by default. To run CSI
-with block volume support enabled, a cluster administrator must enable the
-feature for each Kubernetes component using the following feature gate flags:
-
---feature-gates=BlockVolume=true,CSIBlockVolume=true
-
-these feature-gates must be enabled on both api-server and kubelet
-
-### create a raw-block PVC
-
-```yaml
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: raw-block-pvc
-spec:
-  accessModes:
-    - ReadWriteOnce
-  volumeMode: Block
-  resources:
-    requests:
-      storage: 1Gi
-  storageClassName: csi-rbd
-```
-
-create raw block pvc
-
-```console
-kubectl create -f raw-block-pvc.yaml
-```
-
-### create a pod to mount raw-block PVC
-
-```yaml
----
-apiVersion: v1
-kind: Pod
-metadata:
-  name: pod-with-raw-block-volume
-spec:
-  containers:
-    - name: fc-container
-      image: fedora:26
-      command: ["/bin/sh", "-c"]
-      args: [ "tail -f /dev/null" ]
-      volumeDevices:
-        - name: data
-          devicePath: /dev/xvda
-  volumes:
-    - name: data
-      persistentVolumeClaim:
-        claimName: raw-block-pvc
-```
-
-Create a POD that uses raw block PVC
-
-```console
-kubectl create -f raw-block-pod.yaml
-```

examples/rbd/storageclass.yaml

@@ -35,7 +35,4 @@ parameters:
    userid: kubernetes
    # uncomment the following to use rbd-nbd as mounter on supported nodes
    # mounter: rbd-nbd
-   # fsType: xfs
-   # uncomment the following line to enable multi-attach on RBD volumes
-   # multiNodeWritable: enabled
 reclaimPolicy: Delete