Red Hat APPLICATION STACK 1.2 RELEASE Instrukcja Użytkownika Pobierz pdf (Strona 26)

Chapter 4. Networking and Services

4.12. Bluetooth

Bluetooth Service On Demand

In order to support Bluetooth devices, the Bluetooth background service was started by default in

previous versions of Red Hat Enterprise Linux. In this release, the Bluetooth service is started on

demand when needed and automatically stops 30 seconds after the use of the device has stopped.

This reduces overall initial startup time and resource consumption.

4.13. Cron

Vixie cron and Cronie

Red Hat Enterprise Linux 6 includes the cronie package as a replacement for vixie-cron. The main

difference between these packages is how the regular jobs (daily, weekly, monthly) are done. Cronie

uses the /etc/anacrontab file, which by default looks like the following:

# the maximal random delay added to the base delay of the jobs

RANDOM_DELAY=45

# the jobs will be started during the following hours only

START_HOURS_RANGE=3-22

# period in days delay in minutes job-identifier command

1 5 cron.daily nice run-parts /etc/cron.daily

7 25 cron.weekly nice run-parts /etc/cron.weekly

@monthly 45 cron.monthly nice run-parts /etc/cron.monthly

These regular jobs will be executed once a day in the 03:00-22:00 time interval, including a random

delay. For example, cron.daily will have a 5 minute forced delay plus a random delay of 0-45 minutes.

You could also run jobs with no delays, between 4 and 5:

RANDOM_DELAY=0 # or don't use this option at all

START_HOURS_RANGE=4-5

# period in days delay in minutes job-identifier command

1 0 cron.daily nice run-parts /etc/cron.daily

7 0 cron.weekly nice run-parts /etc/cron.weekly

@monthly 0 cron.monthly nice run-parts /etc/cron.monthly

Features of cronie include:

• Random delay for starting the job in /etc/anacrontab.

• Time range of regular jobs can be defined in /etc/anacrontab.

• Each cron table can have its own defined time zone with the CRON_TZ variable.

• By default, the cron daemon checks for changes in tables with inotify.

For further details about cronie and cronie-anacron, please refer to the Red Hat Enterprise Linux

Deployment Guide.

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Red Hat APPLICATION STACK 1.2 RELEASE Instrukcja Użytkownika Strona 26