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Full Discussion: Cron job not working but works on other nodes.
Operating Systems AIX Cron job not working but works on other nodes. Post 302881039 by zozoo on Thursday 26th of December 2013 09:12:49 AM
Old 12-26-2013
try giving the
Code:
2>&1

to capture the error and also ...can you try to enclose the whole command with in
Code:
()

---------- Post updated at 07:42 PM ---------- Previous update was at 07:27 PM ----------

found some information which can be useful

cron will email you the output of any program it runs (if there is any output). So, if you don't get any output, there are basically three possibilities:

crond could not even start a shell for running the program or sending email
crond had troubles mailing the output, or the mail was lost.
the program did not produce any output (including error messages)

Case 1. is very unlikely, but something should have been written in the cron logs. Cron has an own reserved syslog facility, so you should have a look into /etc/syslog.conf (or the equivalent file in your distro) to see where messages of facility cron are sent. Popular destinations include
Code:
/var/log/cron, /var/log/messages

and
Code:
/var/log/syslog.

In case 2., you should inspect the mailer daemon logs: messages from the Cron daemon usually appear as from
Code:
root@yourhost

. You can use a
Code:
 MAILTO=...

line in the crontab file to have cron send email to a specific address, which should make it easier to grep the mailer daemon logs. For instance:

In case 3., you can test if the program was actually run by appending another command whose effect you can easily check: for instance,

Code:
00 15 * * * /a/command; touch /<some -path>/sucessfullrun

so you can check if crond has actually run something by looking at the mtime of /<some -path>/sucessfullrun
 

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LEARN ABOUT PHP

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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