I want to restart my server every week sunday

jayarajmohan · 11-04-2009, 07:37 AM

Hi all,

I want to set a crontab job for restarting my linux machine every sunday ..

How to do this ?

JayaraJMohan.J

avijitp · 11-04-2009, 08:00 AM

As root user:

Code:

crontab -e

then add following :

Code:

30 1  *    *    7 /sbin/shutdown -r now

This will reboot your server at 1:30 AM server time.

rjlee · 11-04-2009, 08:07 AM

man crontab: http://unixhelp.ed.ac.uk/CGI/man-cgi?crontab
man 5 crontab: http://unixhelp.ed.ac.uk/CGI/man-cgi?crontab+5

TB0ne · 11-04-2009, 02:00 PM

Quote:

Originally Posted by jayarajmohan

Hi all,

I want to set a crontab job for restarting my linux machine every sunday ..

How to do this ?

You write a script that reboots the box, and put it in CRON to run every Sunday.

WhisperiN · 11-05-2009, 06:16 AM

Alright,

I'll assume, that you want to reboot the system whenever it reaches seven days uptime..
Keep on with me, and follow the instructions..

First, we will create a new script, shell script, run:

Code:

nano /bin/RestartMe

Then, copy and paste the following (Copy from here and then right click into the Putty's window to paste it):

Code:

#!/bin/bash

up=$(/usr/bin/uptime | cut -c14-19)

if [[ "$up" = "7 days" ]]; then
/sbin/shutdown -r +2
fi

exit 0

# END

And, then close and save the file

Code:

CTRL + X then Hit Y and then ENTER

Change the file mode to executable:

Code:

chmod 755 /bin/RestartMe

Now, we are done with the reboot script, we will setup a cronjob to run every night:

To open crontab editor:

Code:

crontab -e

and then at the end type the followin:

Code:

30 2 * * * /bin/RestartMe

Summary:
The crontab we sat above, will run the script every night at 2:30 AM server time, thus the script will check for the server uptime, if it's 7 days, a system reboot will be fired.
The reboot command will wait 2 minutes before doing the real reboot, this way it gives a chance for any logged user to finish any running work.

Otherwise, if you want to reboot the system on Sunday after 2 after midnigh (Monday Early Morning), no matter how long is the uptime.. go like:

Code:

crontab -e

At the end type:

Code:

30 2 * * 1 /bin/RestartMe

Hope we helped.. :-)
Regards..

sebastjanp · 02-12-2016, 02:52 AM

Thanks guys easy and understandable.

eklavya · 02-16-2016, 10:57 PM

Quote:

Originally Posted by WhisperiN

Alright,

I'll assume, that you want to reboot the system whenever it reaches seven days uptime..
Keep on with me, and follow the instructions..

First, we will create a new script, shell script, run:

Code:

nano /bin/RestartMe

Then, copy and paste the following (Copy from here and then right click into the Putty's window to paste it):

Code:

#!/bin/bash

up=$(/usr/bin/uptime | cut -c14-19)

if [[ "$up" = "7 days" ]]; then
/sbin/shutdown -r +2
fi

exit 0

# END

And, then close and save the file

Code:

CTRL + X then Hit Y and then ENTER

Change the file mode to executable:

Code:

chmod 755 /bin/RestartMe

Now, we are done with the reboot script, we will setup a cronjob to run every night:

To open crontab editor:

Code:

crontab -e

and then at the end type the followin:

Code:

30 2 * * * /bin/RestartMe

Summary:
The crontab we sat above, will run the script every night at 2:30 AM server time, thus the script will check for the server uptime, if it's 7 days, a system reboot will be fired.
The reboot command will wait 2 minutes before doing the real reboot, this way it gives a chance for any logged user to finish any running work.

Otherwise, if you want to reboot the system on Sunday after 2 after midnigh (Monday Early Morning), no matter how long is the uptime.. go like:

Code:

crontab -e

At the end type:

Code:

30 2 * * 1 /bin/RestartMe

Hope we helped.. :-)
Regards..

If you count uptime of the server, it is not necessary that it will shutdown the system on every Sunday. Somehow if server has been restarted between the week, in this case it will not restart it on Sunday.
If OP wants server should be restarted on sunday then I think a simple cronjob with shutdown -r now or init 0 command will do the task.