Merge pull request #68656 from lpettyjo/OSDOCS-8792

OSDOCS#8792: Shared VPC on GCP Filestore CSI

Author: lpettyjo

modules/persistent-storage-csi-google-cloud-file-create-sc.adoc

@@ -25,17 +25,22 @@ metadata:
   name: filestore-csi
 provisioner: filestore.csi.storage.gke.io
 parameters:
-  network: network-name <1>
+  connect-mode: DIRECT_PEERING <1>
+  network: network-name <2>
 allowVolumeExpansion: true
 volumeBindingMode: WaitForFirstConsumer
 --
-<1> Specify the name of the GCP virtual private cloud (VPC) network where Filestore instances should be created in.
+<1> For a shared VPC, use the `connect-mode` parameter set to `PRIVATE_SERVICE_ACCESS`. For a non-shared VPC, the value is `DIRECT_PEERING`, which is the default setting.
+<2> Specify the name of the GCP virtual private cloud (VPC) network where Filestore instances should be created in. 
 
 . Specify the name of the VPC network where Filestore instances should be created in.
 +
 It is recommended to specify the VPC network that the Filestore instances should be created in. If no VPC network is specified, the Container Storage Interface (CSI) driver tries to create the instances in the default VPC network of the project.
++
 On IPI installations, the VPC network name is typically the cluster name with the suffix "-network". However, on UPI installations, the VPC network name can be any value chosen by the user.
 +
+For a shared VPC (`connect-mode` = `PRIVATE_SERVICE_ACCESS`), the network needs to be the full VPC name. For example: `projects/shared-vpc-name/global/networks/gcp-filestore-network`.
++
 You can find out the VPC network name by inspecting the `MachineSets` objects with the following command:
 +
 [source, command]