On 03/11/2011 04:06 PM, PJ wrote: <snip> > Interesting entries in /var/log/cron: > > -snip- > (this runs 24/7 every 5 minutes as normal...) > > Mar 11 02:20:01 web1 crond[12919]: (webuser) CMD (wget -q > www.domain.com/cron.php >/dev/null 2>&1) <snip> > (fast forward to 3 AM, the same cron job starts getting delayed.... by > 3:27 the server was non responsive. Never seen this before) > > Mar 11 03:01:01 web1 crond[13613]: (root) CMD (run-parts /etc/cron.hourly) > Mar 11 03:07:20 web1 crond[13727]: (webuser) error: Job execution of > per-minute job scheduled for 03:05 delayed into subsequent minute > 03:07. Skipping job run. > Mar 11 03:07:20 web1 crond[13727]: CRON (webuser) ERROR: cannot set > security context <snip> > I don't think it is a coincidence I'm seeing "CRON (webuser) ERROR: > cannot set security context" around the same time the server stops > responding. > > I'm not familiar with this message, anyone here seen it? > > cron daily fires off at 4:02, after all this stuff... > > nothing in cron.hourly.. > > Getting warmer I think, but still cant figure it out! OK, did the webuser job run at 03:00:01 or does it start at 03:05:01? The system likely thinks that cron job is still running from the last time it was initiated. (Be it at 03:00:01 or 02:55:01). Is there anything that the php file called by the cron (via wget) is supposed to do at 03:00 that is different than other times? You might try something like this: */5 0,1,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23 * * * <current_cron_command> 15,30,45 3 * * * <current_cron_comamnd> (those commands should run the cron normally except starting at 03:00, where it should kick off at 3:15 instead of 03:05) If it also fails to start at 03:15 then that would suggest that something is happening to the cron job the last time it is run to make it hang (or make the system think it is hung).
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