How to schedule a periodic task on RedHat Linux server?

[manirana007]

Hello,

I want to schedule a restart of Linux machine every day at night (1pm). And then have it start Weblogic server. I found that cron is a linux schedular, if so, how to schedule using it. Any ideas would be helpful. Thanks.

 

[TonyGroves]

Use a text editor to edit /etc/crontab . There should be some entries there already, and the columns will probably have explanatory headings.

 

[sleipnir214]

If you can't figure out what's going on from your existing crontab file or if you want more details, you might try:

[tt]man 5 crontab[/tt]

at a command line.



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[lgarner]

My preference is to leave /etc/crontab alone. The default crontab on RHEL has this:
# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly

So, any executables in these directories are run at the appointed time. For more control, create a crontab-style file in /etc/cron.d for the tasks.

Finally, as an ordinary user you can create your personal crontab via "crontab -e".

 

[zeland]

Before we get into scheduling, <rant>why on God's green earth do you need to reboot every night?</rant>

Now with that out of the way, just create a file with any name with this one line in it:

0 1 * * * /sbin/shutdown now -r

Then load it as root:

crontab -u root [i][filename][/i]

You will however need to make sure that your boot loader has a default time-out and points to the right kernel.

As for your weblogic, does it have it's own init script? I can't say how you can start the service as different distro's have different ways of configuring services and you didn't specify yours. RedHat/Fedora and their derivatives use chkconfig.


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