[K12OSN] Core Files

Jim McQuillan jam at mcquil.com
Wed Dec 12 21:27:42 UTC 2007


Log in and launch an xterm or gnome-terminal session and run:

     ulimit -c

I know you have your profile script setup to set the max size of core 
files to 0, but it's probably worth checking to see if it's really set.

Jim McQuillan
jam at Ltsp.org

k12ltsp wrote:
> Hi everyone,
> We are having some big issues with Core files being created in the users
> home directories.
> We have set quotas on our network to 300 megs for each user account, and
> some users have issues where core files will take up the entire space in
> their account and prevent it from working.
> We have to continually delete core files in user accounts to get them
> working again. We suspect it is caused by crashes. Also, unfortunately
> students use the CTRL-ALT-BACKSPACE key as a preferred means of logging
> out (it's similar to a force-quit key sequence on a Mac that students were
> taught.), and I believe this is the main source of these files.
> We've looked online and haven't heard anything from any other LTSP users
> with the same issue. 
> I can confirm the issue isn't a hardware problem because we use 10
> different LTSP servers across the district with home mounted via NFS/NIS,
> and these files are created on users logged into any of these servers. It
> must be a configuration issue.
> Under our current setup, we use a Terabyte server as the central Home and
> authentication server, which runs ypserv and contains the home folder.
> Other servers connect via ypserv and mount the home. 
> The strange issue is, I know that under FC, and our FC6, that the creation
> of core files is turned off by default under the /etc/profile section:
> # No core files by default
> ulimit -S -c 0 > /dev/null 2>&1
> We went as far as turning on K12LTSP-LIMITS on, and added the following
> line under the k12ltsp-limits.sh file:
>         ulimit -S -c 0 > /dev/null 2>&1 
> Then restarted the server.
> user accounts:
> /home/athompson/core.6791
> /home/aucoind/core.22328
> /home/barrowsc/core.5070
> /home/bibersteins/core.24006
> /home/bibersteins/core.9923
> /home/blakem/core.16903
> /home/blakem/core.27395
> /home/blakem/core.27747
> /home/blakem/core.29009
> /home/blakem/core.6063
> /home/blakem/core.9060
> /home/bottingryan/core.29282
> /home/bottingryan/core.7044
> /home/boucherc/core.10176
> ~~~~~~~~~~~~~~~~~~~~~~~
> Alan Owen
> Assistant to the Director of Information Services
> Hermon Information Services/Hermon School Department
> "Using Technology to Empower All Students to Succeed in a Changing World."
> ~~~~~~~~~~~~~~~~~~~~~~~
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> For more info see <http://www.k12os.org>

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