[CentOS] Cron script crashing server...
mark_belanger at ltx.com
Mon Oct 3 13:02:29 UTC 2005
Ian mu wrote:
> Ok, weirder, thanks for the advice by the way, I guess its isolated it
> somewhat and not where I thought it would be....added the strace, but
> looks like not needed as never gets that far...
The next thing I would do is to attach strace to cron just before
it kicks off. Make sure to capture the output - there will be a lot
of it. strace -p PIDofCron -f -o/path/somefile
You might also look at the cron file with an octal editor to make
sure there are no funny characters in it. Or just create a brand
I would also look carefully each directory in the path and
the contents of them as well i.e.
ls -ld /home
ls -la /home
ls -ld /home/statsman
ls -la /home/statsman
ls -ld /home/statsman/stats
ls -la /home/statsman/stats
> Piped the cron commandline to a file crondebug as mark suggested, its
> created at cron run time, but empty.
> 36 13 * * *
> For the first line of the run_stats.sh (tried also with #!/bin/bash)
> file it calls I added
> echo "stage 1" >> /home/statsman/stats/gendebug
> Run it manually from console it echos stage 1, (also echo stage 2 I
> added, then after that the perl script is invoked) fine.
> Run from cron it never even does the echo "stage 1" to the file (or at
> least doesn't create it).
> So it looks like its either dying on execing the file and not getting
> any further as it never writes the first line of the simple bash script
> or not even trying to call the file? (file gendebug isn't even created).
> More puzzled at this moment than I thought (nothing in root mail from
> cron either btw, and rest of crontab seems ok, I leave the line in just
> comment out the line with a single # and it doesn't crash ).
> Baffled :), thanks again, Ian
> On 10/3/05, *Ingimar Robertsson* <iar at skyrr.is <mailto:iar at skyrr.is>>
> You could also check what environment variables the perl and shell
> depend upon. Perhaps they are missing in the cron environment (Cron
> don't get the whole shell environment, which might explain why it
> does work
> from the shell)
> On Mon, Oct 03, 2005 at 07:39:48AM -0400, Mark Belanger wrote:
> > Ian mu wrote:
> > > Basically I have a perl script that runs once, first thing every
> > > morning, gathering some stats (currently turned off due to
> > > Crontab -l shows the following...
> > >
> > > 00 6 * * * nice /home/statsman/stats/run_stats.sh >/dev/null
> 2>&1 (.sh
> > > file basically sources with full path a config with some vars,
> then runs
> > > the perl script).
> > The first thing I would do to put some echos in run_stats.sh
> > and change > /dev/null to > /path/somefile
> > If you're getting as far as the perl script, put some print
> > statements in it.
> > You might try doing an strace from cron:
> > 00 6 * * * strace -f -oOutputFile /home/statsman/stats/run_stats.sh
> > >/path/somefile 2>&1
> > -Mark
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> Bestu kveðjur,
> Ingimar Róbertsson, kerfisstjóri, RHCE EMAIL: iar at skyrr.is
> <mailto:iar at skyrr.is>
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