newbie autofs problem

newbie autofs problem

[pablo.roldan]

Hi,

I'm using autofs to automount the home dirs of my users, distributed among
several machines. The config files are:

***** /etc/auto.master: *****
/home /etc/auto_home
***** end /etc/auto.master *****

***** /etc/auto_home: *****
canalias        -rsize=8192,wsize=8192  e04:/homes/&
jmbenita        -rsize=8192,wsize=8192  e05:/homes/&
...
***** end /etc/auto_home *****

Until now, it was all working fine. A few days ago I moved the directory
e04:/homes from / to a (larger) partition, which I now mount as /homes:

***** /etc/fstab: *****
# /etc/fstab: static file system information.
#
#<file sys>          <mount point>     <type>   <options>   <dump>   <pass>
/dev/sda3    /                 ext3    rw,errors=remount-ro  0    1
/dev/sda2    none              swap    rw        0    0
none         /proc             proc    defaults  0    0
none  /proc/bus/usb  usbdevfs  defaults
/dev/fd0  /floppy  auto  users,noauto 0 0
/dev/sda5    /usr                 ext3    defaults  0    2
/dev/sda6    /homes                 ext3    defaults  0    2
***** end /etc/fstab *****

Since that moment, I am having problems accessing anything below /home. For
instance, I can't do

	ls /home

because the shell hangs. It just becomes irresponsive.

There are currently Condor processes running with working directory
/home/canalias.

I've been trying to find out what's going on, with no luck for the moment. Any
hint would be greatly appreciated. I don't even know where to look for logged
errors from the automounter.

I next list the output of command "mount" and "autofs status" for reference:

eixam:~# mount
/dev/sda3 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda5 on /usr type ext3 (rw)
/dev/sda6 on /homes type ext3 (rw)
usbfs on /proc/bus/usb type usbfs (rw)
automount(pid1377) on /home type autofs
(rw,fd=4,pgrp=1377,minproto=2,maxproto=4)
/homes/condor on /home/condor type none (rw,bind)
e04:/homes/canalias on /home/canalias type nfs
(rw,rsize=8192,wsize=8192,addr=192.168.1.4)
e05:/homes/jmbenita on /home/jmbenita type nfs
(rw,rsize=8192,wsize=8192,addr=192.168.1.5)

eixam:~# /etc/init.d/autofs status
Configured Mount Points:
------------------------
/usr/sbin/automount --timeout=300 /home file /etc/auto_home

Active Mount Points:
--------------------
/usr/sbin/automount --pid-file=/var/run/autofs/_home.pid --timeout=300 /home
file /etc/auto_home


Thanks a lot,
/P

Re: newbie autofs problem

[Jeff Moyer]

==> Regarding [autofs] newbie autofs problem; pablo.roldan@upc.edu adds:

pablo.roldan> Hi, I'm using autofs to automount the home dirs of my users,
pablo.roldan> distributed among several machines. The config files are:

pablo.roldan> ***** /etc/auto.master: ***** /home /etc/auto_home ***** end
pablo.roldan> /etc/auto.master *****

pablo.roldan> ***** /etc/auto_home: ***** canalias -rsize=8192,wsize=8192
pablo.roldan> e04:/homes/& jmbenita -rsize=8192,wsize=8192 e05:/homes/& ...
pablo.roldan> ***** end /etc/auto_home *****

pablo.roldan> Until now, it was all working fine. A few days ago I moved
pablo.roldan> the directory e04:/homes from / to a (larger) partition,
pablo.roldan> which I now mount as /homes:

Did you make sure that no clients had the file system mounted?  You simply
can't move things around like this and expect it to work.

pablo.roldan> ***** /etc/fstab: ***** # /etc/fstab: static file system
pablo.roldan> information.  # #<file sys> <mount point> <type> <options>
pablo.roldan> <dump> <pass> /dev/sda3 / ext3 rw,errors=remount-ro 0 1
pablo.roldan> /dev/sda2 none swap rw 0 0 none /proc proc defaults 0 0 none
pablo.roldan> /proc/bus/usb usbdevfs defaults /dev/fd0 /floppy auto
pablo.roldan> users,noauto 0 0 /dev/sda5 /usr ext3 defaults 0 2 /dev/sda6
pablo.roldan> /homes ext3 defaults 0 2 ***** end /etc/fstab *****

pablo.roldan> Since that moment, I am having problems accessing anything
pablo.roldan> below /home. For instance, I can't do

pablo.roldan> 	ls /home

pablo.roldan> because the shell hangs. It just becomes irresponsive.

On the client system?  I'm surprised it hangs, but ESTALE would be very
likely.  Alt-Sysrq-t will show where the ls is hanging out.  However, this
really sounds like an administrative error.  Reboot the client.

The automounter logs to /var/log/messages.  You should check there for any
error messages if you feel this isn't purely a user error.

-Jeff