You cannot directly set up a cron job to run on the N-th (day-of-the-week).
>From the manpage crontab(5):
Note: The day of a command’s execution can be specified by two fields — day
of month, and day of week. If both fields are restricted (ie, aren’t *), the
command will be run when either field matches the current time. For
example, "30 4 1,15 * 5" would cause a command to be run at 4:30 am on the
1st and 15th of each month, plus every Friday.
--------------
To get a script that runs on the N-th Tuesday, I did this:
today=`date +%u`
if [ $today -eq $1 ]
then
....
fi
Then, I call the script from cron like this:
# Run patch script on second Tuesday of every month
05 02 8-14 * * root
/usr/local/scripts/cronScript.sh 2
---------------------
So, the script will run once a day from the 8th thru the 14th and only execute
the guts of the conditional on Tuesday
Adjust the day-of-the-month field accordingly to get the week you want.
“Sometimes I think the surest sign that intelligent life exists elsewhere in
the universe is that none of it has tried to contact us.”
Bill Waterson (Calvin & Hobbes)
----- Original Message -----
From: "Alexander Holte-Davidsen" <alexander.david...@gmail.com>
To: puppet-users@googlegroups.com
Sent: Monday, November 5, 2012 5:23:24 AM
Subject: [Puppet Users] Defining dynamic cron jobs
Hi all,
I have a application that I schedule via cron. This is a application that runs
once a week, either on Tuesday or Thursday. The scheduling is now done via
Puppet.
I now see that I need to redefine this, on some nodes the application should
for example only run the 3. Tuesday each month, not each Tuesday.
I want to do the scheduling using puppet and parameterized classes. For example
I want to be able to define:
foo {'Tuesday':
week => '3',
hour => '18',
minute => '00',
}
This should generate a cron job ( that changes every month). For November it
should look like this:
00 18 20 11 * /usr/bin/foo
Next month the crontab entry should be changed to:
00 18 18 20 * /usr/bin/foo
Has anyone done anything similar and are willing to give me some input on how
to solve this?
/ Alexander
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