[Bug 1024475] Re: libnss-ldap causes boot hang on Ubuntu 12.04 Precise

[Claudio Kuenzler]

I ran into this issue today and I'm very surprised this issue is that
old. This bug makes Ubuntu as an LDAP client unusable.

#17 did help for faster booting of the machine, but that's it. Any
command is still so slow, the machine is useless.

#2 tried it like this:
- Adapted init script /etc/init.d/libnss-ldap like mentioned
- created /etc/nsswitch.conf.local which does NOT contain ldap 
- created /etc/nsswitch.conf.ldap which does contain ldap 
This again works for a very fast boot, but once libnss-ldap is started (and therefore the ldap version of nsswitch.conf becomes active), the system is bloody slow again.

#1 works to regain a "normal" system with local logins but ldap logins
still time out.

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https://bugs.launchpad.net/bugs/1024475

Title:
  libnss-ldap causes boot hang on Ubuntu 12.04 Precise

Status in “libnss-ldap” package in Ubuntu:
  Confirmed

Bug description:
  A configuration that works perfectly after setup prevents an Ubuntu
  12.04 Precise client from booting.

  Checks before rebooting:

  1. winbind authentication is working (console login, xrdp, etc)
  2. libnss-ldap name resolution is working (getent passwd)

  (this is the intended setup)

  After booting the default Grub option we see the machine hung without
  printing anything.

  Booting in recovery mode allows us to see that the last printed
  message is:

  Begin: Running /scrips/init-bottom ... done.

  The problem IS related to libnss-ldap because if we boot via cdrom and
  change nsswitch.conf to use local authentication the machine boots
  again perfectly. We can then change it back to use local
  authentication + ldap (compat ldap) and verify that it works. However
  the system won't come up after rebooting.

  Even though the nss_initgroups_ignoreusers is correctly setup there is
  provavly some service that is trying to use ldap before networking is
  available. The extra options (see below) intended to lower timeouts
  seem to have no effect.

  Configuration details:

  /etc/ldap.conf
  -----------------------------------

  base dc=DOMAIN,dc=COM
  binddn uid=ldapuser,ou=users,dc=DOMAIN,dc=COM
  bindpw XXXXXYYYYZZZZ
  ldap_version 3
  uri ldap://192.168.1.8
  nss_initgroups_ignoreusers avahi,avahi-autoipd,backup,bin,colord,daemon,games,gnats,hplip,irc,kernoops,libuuid,lightdm,list,lp,mail,man,messagebus,news,ntp,proxy,pulse,root,rtkit,saned,speech-dispatcher,sshd,sync,sys,syslog,usbmux,uucp,whoopsie,www-data,xrdp

  /etc/nsswitch.conf
  -----------------------------------

  passwd:         compat ldap
  group:          compat ldap
  shadow:         compat ldap

  hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4 wins
  networks:       files

  protocols:      db files
  services:       db files
  ethers:         db files
  rpc:            db files

  netgroup: nis

  extra options tried on /etc/ldap.conf 
  -----------------------------------

  timelimit 2
  bind_timelimit 1
  nss_reconnect_sleeptime 1
  nss_reconnect_maxsleeptime 1
  bind_policy soft

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