Re: [MLUG] RH - how to enable coredumps?

[Melissa Plunkett <EMAIL:PROTECTED>]

> thanks for your suggestions. However, they do not apply. limit / unlimit is 
> SGI, no? I don't have those commands on my system. Also, limit coredumpsize 0 
> _does_ create a core file, albeit with zero length. In my case, there is _no_ 
> such file.

No it is not SGI specific - they are builtin shell commands (so will 
vary by shell used)
bash ref ulimit: http://www.gnu.org/software/bash/manual/bashref.html#SEC57
csh, etc limit:
http://www.softlab.ntua.gr/facilities/documentation/unix/docs/csh.txt

If it is zero then are you sure the following is not in /etc/profile (I 
believe this is the redhat default):
ulimit -S -c 0 > /dev/null 2>&1

Googling also showed the above command to also be in /etc/init.d/functions

Both of which would produce produce 0 size core files and no file.

> As for limits.conf, there simply are no limits:
> [EMAIL:PROTECTED] ulimit
> unlimited

limits is used by pam to set login parameters for services on a per 
login basis, i.e. in /etc/pam.d/ssshd you can add:
session    required     pam_limits.so
which reads the limits.conf file and set that for those loging in with 
ssh.  If there is nothing set in the file then it is a mute point but on 
some systems it could be the cause of this problem.

Melissa



> 
> Thanks,
> Mark
> 
> 
> 
> On Tuesday 02 March 2004 13:56, Melissa Plunkett wrote:
> 
>>Check /etc/profile for ulimit and /etc/security/limits.conf (see pam
>>limits doc in /usr/share/doc/pam-version).
>>
>>Melissa
>>
>>Mike Miller wrote:
>>
>>>On Tue, 2 Mar 2004, Mark Haidekker wrote:
>>>
>>>>I used to get coredumps from crasing programs, but at some time, this
>>>>stopped.  I suspect it is somehow turned off by default in recent
>>>>distros (RH). Does anybody know off their head where to change the
>>>>setting?
>>>>
>>>>No, it's not a zero-byte coredump, it's no core file at all. Also,
>>>>ulimit and quotas are not set.
>>>
>>>I put the stuff below in my system tcsh .cshrc file.  If you are using
>>>bash, you might have something similar in your bash system-wide config
>>>file (whatever that's called).  Try "man bash" to get started.
>>>
>>>Mike
>>>
>>>
>>># The line below essentially eliminates the core dump files that
>>>sometimes # are created when programs crash.  These files can be useful
>>>in diagnosing # software problems, but more often they will take up space
>>>(e.g., 8 MB) on # the hard drive and not be used or noticed.  This
>>>command limits their size # to zero bytes.  If you need to see core dump
>>>files, run the command # "unlimit coredumpsize".  "man limit" for more
>>>information (for tcsh, refer # to csh instructions).
>>>
>>>limit coredumpsize 0
>>>_______________________________________________
>>>members mailing list
>>>EMAIL:PROTECTED
>>>http://mlug.missouri.edu/mailman/listinfo/members
> 
> 

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