NFS share exportfs not working: Function not implemented

Written by Claudio Kuenzler - 0 comments

Published on August 21st 2024 - Listed in Linux NFS Network

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When I tried to share a local directory as NFS share on a NFS server I ran into the following unexpected error:

root@nfsserver:~# exportfs -a
exportfs: 192.168.5.2:/backup: Function not implemented

A hint found in the OpenSUSE forums pointed to a potential Kernel module issue, and this really seemed to be the case - there was no nfs module loaded:

root@nfsserver:~# lsmod | grep nfs

Did someone uninstall the NFS server on this machine?

root@nfsserver:~# dpkg -l|grep nfs
ii  libnfsidmap2:amd64  0.25-6     amd64        NFS idmapping library
ii  nfs-common          1:1.3.4-6  amd64        NFS support files common to client and server
ii  nfs-kernel-server   1:1.3.4-6  amd64        support for NFS kernel server

Nope, this still seemed to be OK...

Then I came across another hint in the Debian forums, that the NFS server was not started automatically after a system boot. And that actually was what happened in this case, too: The nfs-kernel-server.service was not started! Starting it:

root@nfsserver:~# systemctl start nfs-kernel-server
root@nfsserver:~# systemctl status nfs-kernel-server
- nfs-server.service - NFS server and services
     Loaded: loaded (/lib/systemd/system/nfs-server.service; disabled; vendor preset: enabled)
     Active: active (exited) since Wed 2024-08-21 15:20:59 CEST; 2s ago
    Process: 3914413 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
    Process: 3914414 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
   Main PID: 3914414 (code=exited, status=0/SUCCESS)
        CPU: 7ms

Aug 21 15:20:58 irczsrvp07 systemd[1]: Starting NFS server and services...
Aug 21 15:20:59 irczsrvp07 systemd[1]: Finished NFS server and services.

By starting the NFS Server, this loads the nfs Kernel module:

root@nfsserver:~# lsmod|grep nfs
nfsd                  602112  11
auth_rpcgss           155648  1 nfsd
nfs_acl                16384  1 nfsd
lockd                 126976  1 nfsd
grace                  16384  2 nfsd,lockd
sunrpc                675840  18 nfsd,auth_rpcgss,lockd,nfs_acl

And now, of course, the exportfs command works:

root@nfsserver:~# exportfs -a

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