Added new storageclass for NFS support

samples/storageclass/storageclass-nfs.yaml

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+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: vxflexos-nfs
+provisioner: csi-vxflexos.dellemc.com
+# reclaimPolicy: PVs that are dynamically created by a StorageClass will have the reclaim policy specified here
+# Allowed values:
+#   Reclaim: retain the PV after PVC deletion
+#   Delete: delete the PV after PVC deletion
+# Optional: true
+# Default value: Delete
+reclaimPolicy: Delete
+# allowVolumeExpansion: allows the users to resize the volume by editing the corresponding PVC object
+# Allowed values:
+#   true: allow users to resize the PVC
+#   false: does not allow users to resize the PVC
+# Optional: true
+# Default value: false
+allowVolumeExpansion: true
+parameters:
+  # Storage pool to use on system
+  # Optional: false
+  storagepool: <STORAGE_POOL> # Insert Storage pool
+  # Protection domain that storage pool above belongs to
+  # Needed if array has two storagepools that share the same name, but belong to different protection domains
+  # Optional: true
+  # Uncomment the line below if you want to use protectiondomain
+  # protectiondomain: # Insert Protection domain name
+  # System you would like this storage class to use
+  # Allowed values: one string for system ID
+  # Optional: false
+  systemID: <SYSTEM_ID> # Insert System ID
+  # format options to pass to mkfs
+  # Allowed values: A string dictating the fs options you want passed
+  # Optional: true
+  # Uncomment the line below if you want to use mkfsFormatOption
+  # mkfsFormatOption: "<mkfs_format_option>" # Insert file system format option
+  # Filesytem type for volumes created by storageclass
+  # Default value: None if defaultFsType is not mentioned in values.yaml
+  # Else defaultFsType value mentioned in values.yaml
+  # will be used as default value
+  csi.storage.k8s.io/fstype: nfs
+  # Limit the volume network bandwidth
+  # Value is a positive number in granularity of 1024 Kbps; 0 = unlimited
+  # Allowed values: one string for bandwidth limit in Kbps
+  # Optional: false
+  # Uncomment the line below if you want to use bandwidthLimitInKbps
+  # bandwidthLimitInKbps: <BANDWIDTH_LIMIT_IN_KBPS> # Insert bandwidth limit in Kbps
+  # Limit the volume IOPS
+  # The number of IOPS must be greater than 10; 0 = unlimited
+  # Allowed values: one string for iops limit
+  # Optional: false
+  # Uncomment the line below if you want to use iopsLimit
+  # iopsLimit: <IOPS_LIMIT> # Insert iops limit
+# volumeBindingMode determines how volume binding and dynamic provisioning should occur
+# Allowed values:
+#  Immediate: volume binding and dynamic provisioning occurs once PVC is created
+#  WaitForFirstConsumer: delay the binding and provisioning of PV until a pod using the PVC is created.
+# Optional: false
+# Default value: WaitForFirstConsumer (required for topology section below)
+# nasName: NAS server's name. If not specified, value from secret.yaml will be used
+  # Allowed values: string
+  # Optional: true
+  # Default value: None
+  nasName: "nas-server"
+
+ # allowRoot: enables or disables root squashing (valid only for NFS)
+  # Allowed values:
+  #   true: will allow root users to use their privileges
+  #   false: will prevent root users on NFS clients from exercising root privileges on the NFS server
+  # Optional: true
+  # Default value: false
+  allowRoot: "false"
+
+ # nfsAcls: enables setting permissions on NFS mount directory
+ # This value overrides the NFS ACL (nfsAcls) attribute of corresponding array config in secret, if present
+ # Permissions can be specified in two formats:
+ #   1) Unix mode (NFSv3)
+ #   2) NFSv4 ACLs (NFSv4)
+ #      NFSv4 ACLs are supported on NFSv4 share only.
+ # Allowed values:
+ #   1) Unix mode: valid octal mode number
+ #      Examples: "0777", "777", "0755"
+ #   2) NFSv4 acls: valid NFSv4 acls, seperated by comma
+ #      Examples: "A::OWNER@:RWX,A::GROUP@:RWX", "A::OWNER@:rxtncy"
+ # Optional: true
+ # Default value: "0777"
+ # nfsAcls: "0777"
+
+volumeBindingMode: WaitForFirstConsumer
+# allowedTopologies helps scheduling pods on worker nodes which match all of below expressions.
+allowedTopologies:
+- matchLabelExpressions:
+  - key: csi-vxflexos.dellemc.com/<SYSTEM_ID> # Insert System ID
+    values:
+    - csi-vxflexos.dellemc.com