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Full Discussion: cronjob Command for Shutdown
Operating Systems Linux Red Hat cronjob Command for Shutdown Post 302585987 by babinlonston on Friday 30th of December 2011 01:24:03 AM
Old 12-30-2011
MySQL
thank u mr.admin_xor & getrue

---------- Post updated at 11:54 AM ---------- Previous update was at 10:36 AM ----------

Quote:
Originally Posted by admin_xor
You can run a con job from a central machine to shutdown other machine using ssh. You need to configure ssh key sharing though for this to be working.

The below crontab entry will shutdown every machine specified in a file called /root/machines at 12 o'clock at night everyday (considering you are using Linux machines; syntax for shutting down other UNIX machines varies widely).
Code:
0 0 * * * '/bin/cat /root/machines | while read sys; do /usr/bin/ssh root@$sys "/sbin/shutdown -h now" 1>/dev/null 2>&1'

I assume you are already familiar with cron and how to schedule job with it. Below is the format for crontab entries. For detailed info, check the man page.

Code:
# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed

ya now i have checked the shutdown command its working fine , But im having Centos as my server and there r 50 Pcs with ubuntu , I want to shutdown all 50 Pcs @ 06:05 PM But it need warning message @ 5:55 PM is it possible how can i set the command pls help me
 

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LEARN ABOUT CENTOS

yum-cron

yum-cron(8)															       yum-cron(8)

NAME

       yum-cron - an interface to convieniently call yum from cron

SYNOPSIS

       yum-cron [config-file]

DESCRIPTION

       yum-cron  is  an  alternate  interface to yum that is optimised to be convenient to call from cron.  It provides methods to keep repository
       metadata up to date, and to check for, download, and apply updates.  Rather than accepting many different command line arguments, the  dif-
       ferent functions of yum-cron can be accessed through config files.

       config-file  is	used  to optionally specify the path to the configuration file to use.	If it is not given, the default configuration file
       will be used.  It is useful to be able to specify different configuration files for different use cases.  For  example,	one  configuration
       file  might  be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file.
       Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day.

FILES

       /etc/yum/yum-cron.conf
       /etc/yum/yum-cron-hourly.conf

SEE ALSO

       yum (8)

AUTHORS

       See the Authors file included with this program.

BUGS

       There of course aren't any bugs, but if you find any, you should email
	the mailing list, yum@lists.baseurl.org, or consult bugzilla.

Nick Jacek															       yum-cron(8)
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