mount using nfs4 giving no such device error
I am trying to mount a folder workspace from server to the client over NFS. For this I bind the folder to an /export by adding the following in my /etc/fstab on server:
/home /export none bind
Then I add the following lines in my /etc/exports on my server:
/export *(ro,sync,no_subtree_check,insecure,fsid=0)
/export/workspace *(rw,sync,no_subtree_check,insecure,nohide)
I load the exportfs file, and restart the nfs-kernel-server:
# exportfs -vr
# service nfs-kernel-server restart
I now go to my client and check which folders can be exported:
# showmount -e 192.168.145.131
Export list fo 192.168.145.131:
/export/workspace *
/export *
But when I try mounting the folder, I get the following error:
$ sudo mount -t nfs4 192.168.145.131:/workspace nfs/ -v
mount.nfs4: timeout set for Sat Apr 19 19:16:51 2014
mount.nfs4: trying text-based options 'addr=192.168.145.131,clientaddr=192.168.145.128'
mount.nfs4: mount(2): No such device
mount.nfs4: No such device
I have also tried mounting /export/workspace and /home/workspace but that gives me the same error. I have tried loading the NFS module using modprobe on both client and server, but the module is loaded on both client and server.
Solved the problem after 3 days!!
I tried mounting the nfs4 server folder from a client with a newer Kernel version (3.8). I was able to do so. So I copied the configuration file /boot/configure-3.8-generic file to my /usr/src/.config, and enabled the option Filesystems -> Network File Systems -> NFS3 client load as module and NFS4 client load as module.
compiled my kernel again, created initrd image, updated grub, and now I am able to mount the server folder from my 2.6 kernel client also!
I met the error mount.nfs4: No such device after a system upgrade, and later it was solved by a reboot.
It seems that the problem is that the old kernel module directory /usr/lib/modules/$(uname -r)/ is deleted after the system upgrade, which causes a failure loading the module for nfs things.