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CRONTABS(4)		    Crontabs users' Manual		   CRONTABS(4)

NAME
       crontabs - configuration and scripts for running periodical jobs

SYNOPSIS
       run-parts <directory>

DESCRIPTION
       Crontabs	 is  a historical name for the run-parts script and the system
       crontab. The run-parts script runs all  executables  in	the  specified
       directory.

       The  crontab  file  contains  configuration  which  calls the run-parts
       script on files in the /etc/cron.{daily,weekly,monthly}/ directories.

       Randomization of jobs can be configured in the /etc/sysconfig/run-parts
       file. To enable randomization of jobs, set the RANDOMIZE parameter to 1
       and set the RANDOM parameter to an integer which	 determines  a	random
       seed.  Additionally, you may configure the RANDOMTIME parameter (again,
       by specifying an integer) to provide an additional level of  randomiza‐
       tion. Jobs are not randomized when the RANDOM and RANDOMTIME parameters
       are set to 0. Values in these two parameters must be set to 1 or larger
       to provide a good enough randomization.

       Randomization  of  cron	jobs  can be useful for shared networks, where
       multiple cron jobs executed at once can cause spikes in traffic,	 espe‐
       cially  during daily jobs. With randomized jobs, the workload is evenly
       distributed throughout the day.

EXAMPLE OF CONFIGURATION FILE
       RANDOMIZE=1
       RANDOM=4
       RANDOMTIME=8

SEE ALSO
       crontab(5)

Marcela Mašláňová		  2012-08-29			   CRONTABS(4)

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