Ulimit issues

[Broekman, Maarten]

I ran into this exact problem as well.  The way I fixed it was by
putting two "ulimit -n" commands in /etc/sysconfig/xinetd.
 
I used one to change the hard limit and one to change the soft limit.
This fixed the problem for me.
 
Maarten Broekman
 


  _____  

	From: redhat-sysadmin-list-bounces at redhat.com
[mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Flynn,
Neill
	Sent: Friday, March 14, 2008 6:03 AM
	To: redhat-sysadmin-list at redhat.com
	Subject: Ulimit issues
	
	

	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
<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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