I’m running two NethServers on my network, one’s the primary file server and the second is the backup server. They backup to each other.
This page in the development documentation explains how to add the service to NethServer [Services - Nethserver Dev Doc]
The services I added are:
nfs - Ports: TCP: 111,832,1110,1598,1651,2049,2323,23,63,4045,5009,20049
The service rpcgssd and rpcsvcgssd always reports as ‘Stopped’ on the services tab. They only run when required. There is of course all of the configuration files you’ll need to setup for NFS as well. That’s where Google becomes you friend . To make it easier to test, you should stopped the firewall while setting it up and making the connection first. Just to prove that you are able to get it to connect. Then start the firewall and see what happens. I did that a number of times while stopping and starting the NFS services and rebooting the server just so that I know they connect if anything were to happen. If you start the NFS service and connect to it and then start the firewall, the connection may remain until the NFS service is restarted.
In the end I still had some issues while getting the servers to connect so I added each server in the others firewall and allow all communication between them. I believe I was missing a number of ports that were required and didn’t have the time to hunt them all down.