Hiya, never thought of stracing cron itself, will try that tomorrow (is a bit too busy to risk it going down atm).

 

Thanks, Ian

 

On 10/3/05, Mark Belanger <mark_belanger@ltx.com> wrote:

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
new one.

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

-Mark

>
> Piped the cron commandline to a file crondebug as mark suggested, its
> created at cron run time, but empty.
> 36 13 * * *
>  >/home/statsman/stats/crondebug
>
> 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@skyrr.is <mailto:iar@skyrr.is>>
> wrote:
>
>     You could also check what environment variables the perl and shell
>     scripts
>     depend upon.  Perhaps they are missing in the cron environment (Cron
>     jobs
>     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
>     problem).
>      > > 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
>
>     --
>     Ingimar Róbertsson, kerfisstjóri, RHCE          EMAIL: iar@skyrr.is
>     <mailto:iar@skyrr.is >
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--
Mark Belanger
LTX Corporation
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