[Bug 791588] Re: no idmapd for nfs4-clients

[Chris Lott]

I struggled with the undesired symptom that names are shown in ls -l
output of an NFS filesystem as nobody, instead of the expected user name
as known to the NFS server and client.

Background: I'm using 12.10 client to mount an NFS filesystem exported
from a 12.04 server.  I have the same users on both systems, altho with
different numeric user IDs, listed in /etc/passwd.  Both systems have
proper /etc/hosts entries so that the command dnsdomainname returns the
same string.  On the client, /etc/default/nfs-common has a line
"NEED_IDMAPD=yes".  The filesystem mount requests are accepted.

This bug report suggested mounting the rpc-pipe filesystem manually.
This was successful for me:

  $ sudo service idmapd stop
  $ sudo mount -t rpc_pipefs rpc_pipefs /run/rpc_pipefs
  $ sudo rpc.idmapd -v -f

And then the idmapd process stayed in the foreground, messages were
logged to the window, and then I could debug the id<->name mapping.

When I first installed the nfs-common software on the client, I hit
problems much like what is described in this bug report.  Google lead me
here :)  For example syslog showed this entry:

Dec 27 09:58:20 earthquake rpc.idmapd[8446]: main:
open(/run/rpc_pipefs/nfs): No such file or directory

Maybe I should have rebooted the machine after doing the apt-get, or
some other service needed to be restarted, I just don't know.  After a
reboot, idmapd starts as I expect.

HTH

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https://bugs.launchpad.net/bugs/791588

Title:
  no idmapd for nfs4-clients

Status in “nfs-utils” package in Ubuntu:
  Triaged
Status in “nfs-utils” source package in Oneiric:
  Confirmed
Status in “nfs-utils” source package in Precise:
  Confirmed
Status in “nfs-utils” source package in Quantal:
  Triaged

Bug description:
  Hello!

  Thought this one is bug-report for nfs-common. (And I really typed
  "ubuntu-bug nfs-common" - I'm innocent! I was redirected!)

  I have a debian nfs-server that uses nfs4 and it isn't possible for
  ubuntu to use nfs4-mounts properly, because idmapd won't start
  although it's configured in /etc/default/nfs-common:

  #######################
  $ cat /etc/default/nfs-common 

  NEED_STATD=
  STATDOPTS=
  NEED_IDMAPD=yes
  NEED_GSSD=

  #######################

  A "ps aux" executed on both server and client shows that on the server rpc.idmapd is running, but on the client side it's not.
  Executing rpc.idmapd on the client manually fails:

  #######################
  $ sudo rpc.idmapd -fv

  rpc.idmapd: libnfsidmap: using domain: localdomain

  rpc.idmapd: libnfsidmap: loaded plugin
  /usr/lib/libnfsidmap/nsswitch.so for method nsswitch

  rpc.idmapd: Expiration time is 600 seconds.
  rpc.idmapd: Opened /proc/net/rpc/nfs4.nametoid/channel
  rpc.idmapd: Opened /proc/net/rpc/nfs4.idtoname/channel
  rpc.idmapd: main: (/var/lib/nfs/rpc_pipefs/nfs): No such file or directory

  #######################

  Easy workaround: create that directory!

  #######################
  $ sudo mkdir /var/lib/nfs/rpc_pipefs/nfs

  #######################

  Unfortunately, this doesn't fix the problem on all ubuntu machines. I
  have three of them: A Powermac G4 with an Ubuntu 11.04 fallback Gnome
  2.x-Desktop, a 64bit-machine as a HTPC with a minimal Ubuntu
  installation running XBMC and a netbook with Unity-Desktop. The first
  two do, the netbook doesn't. Could be a problem with WLAN (the netbook
  is not cable-connected) or the server configuration. Got to check a
  few things here…

  But one thing's clear: As long as the package nfs-common doesn't
  create a /var/lib/nfs/rpc_pipefs/nfs directory, idmapd won't start and
  there is no chance to get nfs4 working properly.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: nfs-common 1:1.2.2-4ubuntu5
  ProcVersionSignature: Ubuntu 2.6.38-9.43-powerpc 2.6.38.4
  Uname: Linux 2.6.38-9-powerpc ppc
  Architecture: powerpc
  Date: Wed Jun  1 21:39:56 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release powerpc (20101008)
  ProcEnviron:
   LANGUAGE=de_DE:en
   PATH=(custom, user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: nfs-utils
  UpgradeStatus: Upgraded to natty on 2011-05-03 (28 days ago)

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