Ulimit issues

[Flynn, Neill]

Hi all,

I'm a Solaris admin with a few RH boxes, I have an issue with the number
of descriptors on one of my boxes (Linux HOSTNAME 2.4.21-32.ELsmp #1 SMP
Fri Apr 15 21:17:59 EDT 2005 i686 i686 i386 GNU/Linux), I was *asked* to
increase the number of open files on the box from 1024 to 2048. I
followed the following web page:
http://kbase.redhat.com/faq/FAQ_80_1540.shtm.

These are the notes from the change:
	1. Check if value in higher in /proc/sys/fs/file-max then the
new desired open_man_file
		# cat /proc/sys/fs/file-max
		465305

		if not - change above to 2048 
		and add the following line to /etc/sysctl.conf
			fs.file-max = 2048
		(but not needed of /proc/sys/fs/file-max > new max)

	2. add the following line to /etc/security/limits.conf
		* - nofile 2048
		
	   below the following line:
		#<domain>        <type>  <item>  <value>

		so it looks like:
		#<domain>        <type>  <item>  <value>
		* - nofile 2048

So all I did was the /etc/security/limits.conf file as the
/proc/sys/fs/file-max was above what I wanted to change to.

I bounced the box and checked using ulimit and limit (for bash and
tcsh),I then went home a happy little sysadmin.

This morning I got a mail saying the changes haven't worked, I checked
again, then I su'd into the user's account and checked - it was fine. I
got the users password and telnet'd in directly and discovered that the
limits haven't changed. If I su into the account, ssh or rsh into the
account, it's fine, telnet seems to be the only issue (but I'm not sure
about cron either).

So I goggled it and came up with lots of wonderful changes, including:
Adding: "ulimit -n 2048" to /etc/profile
Adding "limit descriptors 2048" to /etc/csh.login
Adding "session required /lib/security/pam_limits.so"  to
/etc/pam.d/login

Nothing worked and I'm still confused, anyone any suggestions (I've
already considered turning off telnet ;-)

Cheers,
Neill

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