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Full Discussion: Crontab is not loading/running
Operating Systems Solaris Crontab is not loading/running Post 302877095 by hicksd8 on Thursday 28th of November 2013 05:40:34 AM
Old 11-28-2013
It all depends on how you modified the crontab. Did you use the proper tools or did you edit it directly?

Let's not talk about your specific problem for a moment and just say a few things about the cron daemon in generic Unix terms.

***
The cron daemon starts at boot time and loads all the user crontabs into memory. It makes a note of the last modified date/time of each table.

Periodically the daemon will wake up and go and check the user crontabs on disk to see if any of them have changed (by checking again the date/time modified). If it finds that it doesn't have the latest copy of a crontab in memory, it will reload that table and any new cron jobs will be scheduled. Until that time the new jobs will not be run.

So if you were to modify a crontab directly scheduling a job to run one hour later then don't expect it to work.

The workaround would be to stop and restart the cron daemon (see cron man page) but you would need to be root to do that.
***

Perhaps you just need to wait up to 24 hours to see if it begins to run your new cron job.

If you use the proper tools to insert a new cron job then cron knows that you've done it and the job will schedule immediately.

Hope that helps.
 

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LEARN ABOUT OPENSOLARIS

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 5.11							    1 Mar 1994							      queuedefs(4)
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