Add flashblade.snapshotDirectoryEnabled to enable/disable snapshots o…

…n FlashBlade (purestorage#67)

Also referring to https://docs.openshift.com/container-platform/3.11/install_config/persistent_storage/persistent_storage_flex_volume.html
flexvolume driver directory corrected for Atomic host in all comments.

pure-k8s-plugin/README.md

@@ -40,6 +40,7 @@ The following table lists the configurable parameters and their default values.
 | `flasharray.defaultFSOpt`  | Block volume default mkfs options. *Not recommended to change!* | `-q`          |
 | `flasharray.defaultMountOpt`  | Block volume default filesystem mount options. *Not recommended to change!* |     ""    |
 | `flasharray.preemptAttachments`  | Enable/Disable attachment preemption! |     `true`    |
+| `flashblade.snapshotDirectoryEnabled`  | Enable/Disable FlashBlade snapshots |     `false`    |
 | `namespace.pure`            | Namespace for the backend storage  | `k8s`                                     |
 | `orchestrator.name`         | Orchestrator type, such as openshift, k8s | `k8s`                              |
 | `flexPath`                  | Full path of directory to install flex plugin, works with image.tag >= 2.0.1 | `/usr/libexec/kubernetes/kubelet-plugins/volume/exec` |
@@ -150,8 +151,8 @@ This upgrade will not impact the in-use volumes/filesystems from data path persp
     /usr/libexec/kubernetes/kubelet-plugins/volume/exec/pure~flex
     
     # for openshift 3.10+ on RHEL Atomic
-    root@k8s-test-openshift-0:~# find /etc/origin/node/kubelet-plugins/ -name "flex" | xargs dirname
-    /etc/origin/node/kubelet-plugins/volume/exec/pure~flex
+    root@k8s-test-openshift-0:~# find /etc/origin/kubelet-plugins/ -name "flex" | xargs dirname
+    /etc/origin/kubelet-plugins/volume/exec/pure~flex
     ```
 
 ## Platform and Software Dependencies
@@ -250,7 +251,7 @@ running the kubelet service.
 
 The kubelet configuration is then set via the `node-config.yaml` in the
 `kubeletArguments` section to set the `volume-plugin-dir`. The easiest
-path to use is something like `/etc/origin/node/kubelet-plugins` or similar
+path to use is something like `/etc/origin/kubelet-plugins` or similar
 as the node config path is passed through to the container.
 
 # License

pure-k8s-plugin/templates/pure-provisioner.yaml

@@ -38,6 +38,8 @@ spec:
             value: {{ .Values.namespace.pure }}
           - name: PURE_DEFAULT_BLOCK_FS_TYPE
             value: {{ .Values.flasharray.defaultFSType }}
+          - name: PURE_DEFAULT_ENABLE_FB_NFS_SNAPSHOT
+            value: {{ .Values.flashblade.snapshotDirectoryEnabled }}
       volumes:
         - name: config
           configMap:

pure-k8s-plugin/values.yaml

@@ -31,6 +31,9 @@ flasharray:
   defaultMountOpt: ""
   preemptAttachments: "true"
 
+flashblade:
+  snapshotDirectoryEnabled: "false"
+
 # there are two namespaces for this app
 # 1. namespace.pure is the backend storage namespace where volumes/shares/etc
 #    will be created.
@@ -53,7 +56,7 @@ orchestrator:
 flexPath: /usr/libexec/kubernetes/kubelet-plugins/volume/exec
 
 # Default for Openshift 3.10+ on RHEL Atomic (containerized kubelet/origin-node)
-#flexPath: /etc/origin/node/kubelet-plugins/volume/exec
+#flexPath: /etc/origin/kubelet-plugins/volume/exec
 
 # Default for Openshift 3.9 and lower with RHEL Atomic
 #flexPath : /usr/libexec/kubernetes/kubelet-plugins/volume/exec