[Bug 1973101] Re: After upgrade to 22.04 NFS exports for vers 2 and 3 no longer work

Thu May 12 18:44:56 UTC 2022

I did some tests, and looks like I was able to configure ubuntu 22.04 to
export NFS v2. I was able to mount from an ubuntu 14.04 machine
specifying vers=2:

t1 is trusty (14.04), j1 is jammy (22.04):
root at t1:~# rpcinfo -s j1-nfs-server
   program version(s) netid(s)                         service     owner
    100000  2,3,4     local,udp,tcp,udp6,tcp6          portmapper  superuser
    100024  1         tcp6,udp6,tcp,udp                status      113
    100005  3,2,1     tcp6,udp6,tcp,udp                mountd      superuser
    100003  4,3,2     tcp6,tcp                         nfs         superuser
    100227  3,2       tcp6,tcp                         -           superuser
    100021  4,3,1     tcp6,udp6,tcp,udp                nlockmgr    superuser

root at t1:~# mount j1-nfs-server:/storage /mnt -o vers=2
root at t1:~# mount -t nfs
j1-nfs-server:/storage on /mnt type nfs (rw,vers=2,addr=192.168.122.136)

Note that TCP was used, though, not UDP.

To allow the 22.04 server to export via UDP, add "udp=y" to the [nfsd]
section in /etc/nfs.conf and restart nfs-utils and nfs-server, and then
I can specify udp:

root at t1:~# mount j1-nfs-server:/storage /mnt -o vers=2,udp
j1-nfs-server:/storage on /mnt type nfs (rw,vers=2,udp,addr=192.168.122.136)

The config I used on the 22.04 server was:
root at j1-nfs-server:~# nfsconf --dump
[general]
 pipefs-directory = /run/rpc_pipefs

[mountd]
 manage-gids = 1

[nfsd]
 debug = all
 rdma = n
 threads = 8
 udp = y
 vers2 = y
 vers2,3,4 = y
 vers3 = y
 vers4 = y
 vers4.0 = y
 vers4.1 = y
 vers4.2 = y

That being said, from 22.04 I CANNOT mount an NFSv2 export:
root at j1-nfs-server:~# mount j1-nfs-server:/storage /mnt -o vers=2
mount.nfs: requested NFS version or transport protocol is not supported

So the TL:DR seems to be that 22.04 can export NFSv2, even via UDP, but
not MOUNT NFSv2.

To make progress in this bug, please show:
- nfsconf --dump on the 22.04 server
- attempted mount error on the NFSv2 and NFSv3 clients, including dmesg and /var/log/syslog (or equivalent) covering the attempt
- try enabling UDP in your 22.04 server's /etc/nfs.conf. Keep in mind that, since your server was upgraded, you will also have an /etc/nfs.conf.d/local.conf. You may want to merge local.conf with nfs.conf. See the release notes at [1] for more details, and perhaps the server guide[2] where the new nfs changes are also documented, in particular the upgrade scenario.

1. https://discourse.ubuntu.com/t/jammy-jellyfish-release-notes/24668
2. https://ubuntu.com/server/docs/service-nfs

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to nfs-utils in Ubuntu.
https://bugs.launchpad.net/bugs/1973101

Title:
  After upgrade to 22.04 NFS exports for vers 2 and 3 no longer work

Status in nfs-utils package in Ubuntu:
  Incomplete

Bug description:
  I upgraded from 20.04 to 22.04 a server which has NFS clients that are
  version 2 (SunOS 4.1.4), version 3 (Redhat 6.2) and version 4.2 (other
  modern Linux systems).

  After upgrading the version 2 and version 3 clients no longer can
  mount the file systems.

  A check with rpcinfo -p showed version 2 no longer being advertised, I
  checked the conf and found the update had disabled it, I re-enabled
  it.

  Version 3 was still advertised, but the mount still fails, and after
  re-enabling version 2, the mount still fails.

  I am also not at all appreciative of the unauthorized changes that the
  upgrade made to my exports file.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: nfs-kernel-server 1:2.6.1-1ubuntu1
  Uname: Linux 5.17.6 x86_64
  .etc.request-key.d.id_resolver.conf: create	id_resolver	*	*	/usr/sbin/nfsidmap -t 600 %k %d
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Wed May 11 18:44:54 2022
  NFSMounts:

  NFSv4Mounts:
   /bu    204.122.16.128:/mail.bu nfs4   rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=204.122.16.222,local_lock=none,addr=204.122.16.128
   /misc  204.122.16.12:/misc     nfs4   rw,nosuid,nodev,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=204.122.16.222,local_lock=none,addr=204.122.16.12
   /home  204.122.16.12:/home     nfs4   rw,nosuid,nodev,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=204.122.16.222,local_lock=none,addr=204.122.16.12
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: nfs-utils
  UpgradeStatus: Upgraded to jammy on 2022-05-10 (1 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1973101/+subscriptions