[Bug 911796] Re: NFS clients can no longer mount shares

[Giuseppe Vacanti]

The nfs-kernel-server init script runs

rpcinfo -u localhost nfs 3

if localhost cannot be resolved for some reason this command will fail,
and the server is started with the option

--no-nfs-version 3

even though the kernel could actually support this version.

rpcinfo looks up localhost as specified in nsswitch.conf, and if one has
the latter configured as the man page suggests, namely

hosts:          dns [!UNAVAIL=return] files

the lookup of localhost will fail.

If NFS v3 is not available, and you have not configured NFS v4, then the
clients will negotiate NFS v2 or v1, and these have no acl support. If
the clients try to mount using version 4, the mount will fail.

I close the bug as resolved.

** Changed in: nfs-utils (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: nfs-utils (Ubuntu)
       Status: Invalid => Opinion

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https://bugs.launchpad.net/bugs/911796

Title:
  NFS clients can no longer mount shares

Status in “nfs-utils” package in Ubuntu:
  Opinion

Bug description:
  Possibly the bug is in the server. I cannot decide.

  This is on 10.04.

  After a reboot NFS clients can no longer mount NFS shares. For
  instance:

  mount -v nfs:/cosine /mnt/
  mount: no type was given - I'll assume nfs because of the colon
  mount.nfs: timeout set for Wed Jan  4 15:37:15 2012
  mount.nfs: text-based options: 'addr=192.168.1.11'
  mount.nfs: mount(2): Protocol not supported
  mount.nfs: trying 192.168.1.11 prog 100003 vers 3 prot UDP port 2049
  mount.nfs: trying 192.168.1.11 prog 100005 vers 3 prot UDP port 39863
  mount.nfs: mount to NFS server 'nfs:/cosine' failed: RPC Error: Success

  Because if this clients with entries in /etc/fstab or that make use of
  autofs are just stranded without their disk partitions.

  If I give nfsvers=2, as below, the mount succeeds, but I cannot use
  NFS version 2:

  mount -v -o nfsvers=2 nfs:/cosine /mnt/
  mount: no type was given - I'll assume nfs because of the colon
  mount.nfs: timeout set for Wed Jan  4 15:37:50 2012
  mount.nfs: text-based options: 'nfsvers=2,addr=192.168.1.11'
  nfs:/cosine on /mnt type nfs (rw,nfsvers=2)

  I have clients on 11.10, they can mount but they seem to negotiate a
  lower NFS version:

  mount -v nfs:/cosine /mnt
  mount: no type was given - I'll assume nfs because of the colon
  mount.nfs: timeout set for Wed Jan  4 15:40:32 2012
  mount.nfs: trying text-based options 'vers=4,addr=192.168.1.11,clientaddr=192.168.1.2'
  mount.nfs: mount(2): No such file or directory
  mount.nfs: trying text-based options 'addr=192.168.1.11'
  mount.nfs: prog 100003, trying vers=3, prot=6
  mount.nfs: trying 192.168.1.11 prog 100003 vers 3 prot TCP port 2049
  mount.nfs: prog 100005, trying vers=3, prot=17
  mount.nfs: trying 192.168.1.11 prog 100005 vers 3 prot UDP port 39863
  mount.nfs: portmap query retrying: RPC: Program/version mismatch
  mount.nfs: prog 100005, trying vers=3, prot=6
  mount.nfs: trying 192.168.1.11 prog 100005 vers 3 prot TCP port 45556
  mount.nfs: portmap query failed: RPC: Program/version mismatch
  mount.nfs: prog 100003, trying vers=2, prot=6
  mount.nfs: trying 192.168.1.11 prog 100003 vers 2 prot TCP port 2049
  mount.nfs: prog 100005, trying vers=1, prot=17
  mount.nfs: trying 192.168.1.11 prog 100005 vers 1 prot UDP port 39863
  nfs:/cosine on /mnt type nfs (rw)

  While in the latter case the machine is at least usable (but I have
  problems with ACLs), in the former it is broken

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nfs-kernel-server 1:1.2.0-4ubuntu4.2
  ProcVersionSignature: Ubuntu 2.6.32-37.81-generic-pae 2.6.32.49+drm33.21
  Uname: Linux 2.6.32-37-generic-pae i686
  Architecture: i386
  Date: Wed Jan  4 15:30:49 2012
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: nfs-utils

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