RPCNFSDCOUNT is ignored on Ubuntu Server 22.04.1

Question

I'm trying to increase the thread count of nfsd by editing /etc/default/nfs-kernel-server file. I set up RPCNFSDCOUNT=48 but after reboot, nfsd thread count is still Ubuntu default which is 8.

root@nfs-server2:~# ps ax | grep nfsd
   2589 ?        Ss     0:00 /usr/sbin/nfsdcld
   2596 ?        S      0:00 [nfsd]
   2597 ?        S      0:00 [nfsd]
   2598 ?        S      0:00 [nfsd]
   2599 ?        S      0:00 [nfsd]
   2600 ?        S      0:00 [nfsd]
   2601 ?        S      0:00 [nfsd]
   2602 ?        S      0:00 [nfsd]
   2603 ?        S      0:00 [nfsd]
   2790 pts/2    S+     0:00 grep --color=auto nfsd

Only changing thread count by hand is working.

root@nfs-server2:~# rpc.nfsd 48
root@nfs-server2:~# ps ax | grep "\[nfsd\]" | wc -l
48

But this is not reboot-proof.

Answer 1

I was able to make the changes stick by changing the threads in /etc/nfs.conf.d/local.conf

[nfsd]
vers2 = n
vers3 = n
threads = 16

[mountd]
manage-gids = 1

And then restarting nfs-server

sudo systemctl restart nfs-server.service