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Full Discussion: Executing python scripts via cron job
Top Forums UNIX for Dummies Questions & Answers Executing python scripts via cron job Post 302605889 by ashwini.engr07 on Friday 9th of March 2012 01:15:04 AM
Old 03-09-2012
Executing python scripts via cron job
Hi,

I'm executing a python script via cron job. The way it is set up is, I'm editing a file called local[ inside /etc/cron.d/.The local file content is as follows:

Code:
00 22 * * * root su - -c "/opt/setup_dir/bin/run_bkp -p"

When this job executes, the command-specific logfile and the syslog (where the logs are supposed to go) show half of the logs(no errors) and the command (and also the child cron) gets terminated in the midway(checked it with ps -ef | grep su and same way for the child cron) without deleting the lock files(which it is normally supposed to do even on an abnormal termination).

I browsed for this issue and found the suspect might be the way stdout(print in python) is handled in cron! To confirm, i just executed another python script that logs to logfile and also prints to console. It gave me the same failure.

But if I change the content of the local file to

Code:
00 22 * * * root su - -c "/opt/setup_dir/bin/run_bkp -p > /root/cronlog"

it works just fine. The process completes gracefully with all the cleanup actions done and logs updated.

But i still do not understand so clearly what was exactly the issue, can someone explain if it is known to you? And also the MAILTO field in /etc/crontab file is empty ("").I'm hoping this is the default path where we get the cron logs as mails . Will it help to solve this if i change this filed? (pls let me know what to populate this with)

Kindly suggest the best solution for this.
 

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LEARN ABOUT PLAN9

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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