NIS and autofs and /net
From: Rick Denoire (100.17706_at_germanynet.de)
Date: 02/21/04
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Date: Sat, 21 Feb 2004 15:20:00 +0100
Hello
I incorporated a Linux client into a Sun NIS domain, "seems" to work.
According to the Redhat instructions (using RH AS 2.1), one has to add
a line to the client's /etc/passwd file like this:
+::::::
(I put it at the beginning).
After doing that and a some other things, NIS accounts can be used to
connect to the NIS domain. But a serious problem appeared with the
/net map. The intention is to find all nfs shares in the domain
beneath the directories /net/<servername>/<sharename> without having
to specify the name of the servers or shares before hand; all Sun
clients (workstations) can do that.
The automounter works fine for all indirect maps defined in the
client's own /etc/auto.master file, except for the auto_net entry. I
have tried so hard here, used even the entry
/net program:/etc/auto_net
and put an executable script in /etc/auto_net as recommended in the
autofs-Howto. This script (see below) executes fine when called with
"/etc/auto_net <servername>". For example, the command
#/etc/auto_net dbs
yields:
-fstype=nfs,soft,intr,nodev,nosuid,nonstrict \
/export/apps dbs:/export/apps \
/export/home dbs:/export/home
and that should be fine.
This is the script auto_net:
#!/bin/sh
key=$1
opts="-fstype=nfs,soft,intr,nodev,nosuid,nonstrict"
SHOWMOUNT="/usr/sbin/showmount --no-headers -e $key"
$SHOWMOUNT | LC_ALL=C sort +0 | \
awk -v key="$key" -v opts="$opts" -- '
BEGIN { ORS=""; first=1 }
{ if (first) { print opts; first=0 }; print " \\\n\t" $1,key
":" $1 }
END { if (!first) print "\n"; else exit 1 }
'
This is my /etc/auto.master:
/misc /etc/auto.misc --timeout=60
/net program:/etc/auto_net
#/net -hosts -nosuid
#/net file:/etc/auto_net -nosuid
/home auto_home -nobrowse
/apps file:/etc/auto_apps
Then I realized that I was using autofs3. I did a rmmod, put the line
"alias autofs autofs4" in /etc/modules.conf, restarted the autofs, but
that did not seem to help. This is what lsmod reveals after that:
Module Size Used by Not tainted
autofs4 12644 4 (autoclean)
so autofs4 is being used, but a "cat /proc/filesystems" shows
"autofs").
# automount --version
Linux automount version 3.1.7
This is my /etc/nsswitch.conf:
passwd: files nis
shadow: files nis
group: files nis
hosts: nis files dns
bootparams: nisplus [NOTFOUND=return] files
ethers: files
netmasks: files
networks: files
protocols: files nisplus
rpc: files
services: files nisplus
netgroup: nis files
publickey: nisplus
automount: files nis
aliases: nis files
so if a map file is present at the client, the NIS map won't be used,
and this is the desired behavior.
This is what I found about autofs4 in my system (kernel
2.4.9.e.30smp):
/lib/modules/2.4.9-e.30smp/kernel/fs/autofs
/lib/modules/2.4.9-e.30smp/kernel/fs/autofs/autofs.o
/lib/modules/2.4.9-e.30smp/kernel/fs/autofs4
/lib/modules/2.4.9-e.30smp/kernel/fs/autofs4/autofs4.o
When trying "cd /net/dbs" I get the following complain in the messages
file:
Feb 21 13:21:49 tuxedo automount[32644]: attempting to mount entry
/net/dbs
Feb 21 13:21:49 tuxedo automount[308]: lookup(program): lookup for dbs
failed
In /var/log/messages, after reloading /etc/init.d/autofs I got:
Feb 21 13:21:33 tuxedo automount[32644]: starting automounter version
3.1.7, path = /net, maptype = program, mapname = /etc/auto_net
Feb 21 13:21:33 tuxedo automount[32644]: using kernel protocol version
3 Feb 21 13:21:33 tuxedo automount[32671]: starting automounter
version 3.1.7, path = /home, maptype = yp, mapname = auto.home
Feb 21 13:21:33 tuxedo automount[32671]: parse(sun): unknown option:
-nobrowse
Feb 21 13:21:33 tuxedo automount[32671]: using kernel protocol version
3
Feb 21 13:21:33 tuxedo automount[32698]: starting automounter version
3.1.7, path = /apps, maptype = file, mapname = /etc/auto_apps
Feb 21 13:21:33 tuxedo automount[32698]: using kernel protocol version
3
Feb 21 13:21:33 tuxedo automount[32722]: starting automounter version
3.1.7, path = /usr/local, maptype = file, mapname = auto_local
I don't understand why version 3 of autofs was loaded at all, and why
version 4 won't work either.
I think I have done all my "home tasks", but now I am stuck.
Any help will be highly appreciated.
Bye
Rick Denoire
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