Whenever NFS mount problem, check at client side:
$showmount -e serverhost
If output error occur as:
mount clntudp_create: RPC: Program not registered
then it’s a server side issue.
Ensure the following is included in file: /etc/hosts.allow
portmap: your.sub.net.number/your.sub.net.mask
e.g. portmap: 192.168.1.0/255.255.255.0
then restart nfsd by:
$service nfs restart
In case, error message:
mount: RPC: Remote system error – No route to host
then run at server side:
rpcinfo -p
immediately after
service nfs restart
to check all the relevent ports to be open for firewall enabled environment at server side.
Tricks:
since RPC has problem to fix ports to be open for portmap, ports listed from “rpcinfo -p” MAY be changed after each start up of nfs service.
useful info to be found at Linux NFS-HOWTO
