The Ubuntu nfs-kernel-server package installs an init script in /etc/init.d/nfs-kernel-server that checks the kernel for a certain ksym to determine if the kernel has NFS support compiled in. Rackspace Cloud Servers use a custom kernel that does not include that particular ksym, however NFS functionality is fully supported.
To enable NFS with Ubuntu on a Cloud Server you’ll need to edit /etc/init.d/nfs-kernel-server and remove or comment out the following lines:
# See if our running kernel supports the NFS kernel server
if [ -f /proc/kallsyms ] && ! grep -qE ' nfsd_serv ' /proc/kallsyms; then
log_warning_msg "Not starting $DESC: no support in current kernel."
exit 0
fi
After this, start NFS as normal: sudo /etc/init.d/nfs-kernel-server
and everything should work properly.
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Worked for me! Thanks!