Manual Suse openSUSE 12.2 (page 213 of 530) (English)

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A number of packages install shell scripts to the directories /etc/cron.hourly,

/etc/cron.daily, /etc/cron.weekly and /etc/cron.monthly, whose

execution is controlled by /usr/lib/cron/run-crons. /usr/lib/cron/run

-crons is run every 15 minutes from the main table (/etc/crontab). This guaran-

tees that processes that may have been neglected can be run at the proper time.

To run the hourly, daily or other periodic maintenance scripts at custom times,

remove the time stamp les regularly using /etc/crontab entries (see Example 11.2,

“/etc/crontab: Remove Time Stamp Files” (page 195), which removes the hourly one

before every full hour, the daily one once a day at 2:14 a.m., etc.).

Example 11.2:

/etc/crontab: Remove Time Stamp Files

59 * * * * root rm -f /var/spool/cron/lastrun/cron.hourly

14 2 * * * root rm -f /var/spool/cron/lastrun/cron.daily

29 2 * * 6 root rm -f /var/spool/cron/lastrun/cron.weekly

44 2 1 * * root rm -f /var/spool/cron/lastrun/cron.monthly

Or you can set DAILY_TIME in /etc/sysconfig/cron to the time at which

cron.daily should start. The setting of MAX_NOT_RUN ensures that the daily tasks

get triggered to run, even if the user did not turn on the computer at the specied

DAILY_TIME for a longer period of time. The maximum value of MAX_NOT_RUN is

14 days.

The daily system maintenance jobs are distributed to various scripts for reasons of

clarity. They are contained in the package aaa_base. /etc/cron.daily contains,

for example, the components suse.de-backup-rpmdb, suse.de-clean-tmp

or suse.de-cron-local.

11.1.3 Log Files: Package logrotate

There are a number of system services (daemons) that, along with the kernel itself,

regularly record the system status and specic events onto log les. This way, the ad-

ministrator can regularly check the status of the system at a certain point in time, recog-

nize errors or faulty functions and troubleshoot them with pinpoint precision. These

log les are normally stored in /var/log as specied by FHS and grow on a daily

basis. The logrotate package helps control the growth of these les.

Congure logrotate with the le /etc/logrotate.conf. In particular, the

include specication primarily congures the additional les to read. Programs that

Special System Features 195

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Suse openSUSE 12.2 Manual

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