allow to specify NFS version, or is there any workaround?

The csi-driver-nfs always try a NFSv4 connection.

When trying to connect to a NFSv3 only server it fails.

If I do tests from a linux machine to connect to this NFS server

root@ubuntu1804:/home/irispulse# mount -v -t nfs 192.168.123.1:/ /mnt mount.nfs: timeout set for Thu Mar 18 07:18:43 2021 mount.nfs: trying text-based options 'vers=4.2,addr=192.168.123.1,clientaddr=192.168.123.129' mount.nfs: mount(2): Operation not supported mount.nfs: requested NFS version or transport protocol is not supported

but if passing options

root@ubuntu1804:/home/irispulse# mount -v -t nfs -o nfsvers=3 192.168.123.1:/ /mnt mount.nfs: timeout set for Thu Mar 18 07:19:49 2021 mount.nfs: trying text-based options 'nfsvers=3,addr=192.168.123.1' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 192.168.123.1 prog 100003 vers 3 prot TCP port 2049 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying 192.168.123.1 prog 100005 vers 3 prot UDP port 1058
and works!

---- Use case

I have several testing/dev environments. And the aim is having lightweight dev environments on windows system.
Here I can use winnfsd https://github.com/winnfsd/winnfsd, on the main windows host, and have k8s running in a VM.
Then I can run WinNFSd.exe -pathFile C:\path\to\your\pathfile and simulate the exports of a linux NFS server
However WinNFSd only supports NFSv3, and I cannot find any open source NFSv4 client for this windows lightweight kind of systems.

[andyzhangx]

try mountOptions:

csi-driver-nfs/deploy/example/storageclass-nfs.yaml

Lines 12 to 14 in c1bf3bb

	mountOptions:
	- hard
	- nfsvers=4.1

Thanks, its work !