Greetings,
On Tue, 22 Oct 2013, [email protected] wrote:
Hello everyone,
I need to have a python script running every minute to send a heartbeat
broadcast.
I have developed this sript and it works just fine when I start it from the
shell.
Next step was to actually add it to the cron list.
So I have been looking on the net and I saw that should be possible by
using crontab -e.
So that's what I've done, resulting in the following :
30 * * * * /usr/bin/ntpdate-sync silent
1 * * * * python /home/root/keep_alive.py >>cronjob.log
The first line in your crontab runs once per hour at 30 minutes past
the top of the hour. The second line also runs once per hour, but runs 1
minute past the top of the hour. *NOT* once every minute as you desired.
Crond runs *only* once every minute (finest resolution possible), so if
you want a cron job to run once every minute, then you need to set the
fields as follows:
* * * * * /home/root/keep_alive.py >> cronjob.log
And check to make certain that your script actually resides in the
directory path you have given (/home/root/). The 'root' account's home
directory is /root, not /home/root, so to have /home/root you must have
performed a mkdir to create that root subdirectory under /home. Also be
aware that plain old users CANNOT run scripts that require 'root'
permissions. They must be run out of the system crontab configured in
/etc/crontab.
Also verify that the permissions are set correctly on your python
script so that it is executable. 'ls -al keep_alive.py' will show the
permissions. 'chmod u+x keep_alive.py' will turn on the execute bit for
this file to be run as the User.
Hope this helps!
--- Jay Nugent WB8TKL
UNIX/Linux System Administration instructor
Washtenaw Community College - Ann Arbor, Michigan
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