Here, try this. http://community.wd.com/t5/WD-My-Cloud/How-to-get-RaspberryPi-communicating-to-WD-MyCloud-over-NFS/m-p/731836/highlight/true
It has been posted before but, until I found this link – today, I had been searching for several months.
There are two commands that you need to know on the client (the Linux system accessing the WD MyCloud - in my case a Raspberry Pi running squeezeplug)
1/. from the command line
mount -t nfs 192.168.1.20:/nfs/Public /mnt/nfs
2/. in /etc/fstab
192.168.1.20:/nfs/Public /mnt/nfs nfs defaults 0 0
On my WD MyCloud I currently have the line
/nfs/Public
in the file
/etc/exports
I do not know if this is neccessary as I have simply left it in there.
Mine is currently working fine.
Hope this helps