01-11-2011
Cron job fails every now and then.
I added a shell script to cron that executes every 5-15 minutes. It's used to monitor multiple environments, so it has to ssh to each machine to check the status of that machine. Sometimes, I may have more than one instance of this script running at the same time. So, here's my problem. I've noticed that sometimes, certain environments don't finish running the script. I'm thinking that the issue is that the script doesn't finish the ssh. When I run the script manually, it works every time. I was wondering if cron jobs are executed with some lower processing priority. Is there a command that will make these scripts run with a higher priority? Are there any ideas out there as to what's going on with the jobs? I noticed that after spacing the jobs out a little, it helped smooth out the number of failed jobs. The failures still happen, just not as many.
Thanks in advance for all responses.
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LEARN ABOUT FREEBSD
atrun
ATRUN(8) BSD System Manager's Manual ATRUN(8)
NAME
atrun -- run jobs queued for later execution
SYNOPSIS
atrun [-l load_avg] [-d]
DESCRIPTION
Atrun runs jobs queued by at(1).
Root's crontab(5) file /etc/crontab has to contain the line
*/5 * * * * root /usr/libexec/atrun
so that atrun gets invoked every five minutes.
At every invocation, atrun will start all the jobs in the lowercase queues whose start time has elapsed. In addition, if the load average
over the last minute was less than the specified limit then a maximum of one batch job (denoted by the uppercase queues) is started.
Before starting a job, atrun will check the status of its owner's account with pam(3) and refuse to run the job if the account is unavail-
able, e.g., locked out or expired.
OPTIONS
-l load_avg
Specify a limiting load factor, over which batch jobs should not be run, instead of the default of 1.5 * number of active CPUs.
-d Debug; print error messages to standard error instead of using syslog(3).
WARNINGS
For atrun to work, you have to start up a cron(8) daemon.
FILES
/etc/pam.d/atrun pam.conf(5) configuration file for atrun
/var/at/jobs Directory containing job files
/var/at/spool Directory containing output spool files
SEE ALSO
at(1), crontab(1), pam(3), syslog(3), crontab(5), pam.conf(5), cron(8)
BUGS
The functionality of atrun should be merged into cron(8).
BSD
October 30, 2012 BSD