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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On Mon, Nov 5, 2012 at 4:23 AM, Alexander Holte-Davidsen <alexander.davidsen@gmail.com> wrote:> 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/fooHmmm. Should that be: 00 18 18 12 * ? 20 is an invalid month.> Has anyone done anything similar and are willing to give me some input on > how to solve this?Instead of using the wildcard (''*'') month, could you (simply) specify the months? 0 18 20 1 * 0 18 18 2 * 0 18 20 3 * 0 18 18 4 * 0 18 20 5 * 0 18 18 6 * 0 18 20 7 * 0 18 18 8 * 0 18 20 9 * 0 18 18 10 * 0 18 20 11 * 0 18 18 12 * -mz -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-users@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
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.davidsen@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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Alexander Holte-Davidsen
2012-Nov-05 14:23 UTC
Re: [Puppet Users] Defining dynamic cron jobs
Hi!
Thanks for the feedback! Unfortunately both suggestions gives me to little
freedom, so I ended up using the chronic gem for ruby. I can give a small
example of what I have done. Please not that this is extremely early in the
development:
class test {
$weeknumber = ''3''
$weekday = ''Tuesday''
$hour = ''22''
$minute = ''00''
$monthday = template(''test/date.erb'')
if ( $monthday =~ /^UNDEF/ ) {
notify {''Monthday is wrong'': }
}
else {
cron{''Testing'':
ensure => present,
hour => "$hour",
minute => "$minute",
monthday => "$monthday",
command => ''echo hello'',
}
}
}
date.rb:
<%require ''time''
require ''chronic''
time = Time.new
@month = time.strftime("%B").downcase.chomp
@week = weeknumber.downcase.chomp
@weekday = weekday.downcase.chomp
date = Chronic.parse("#{@week}rd #{@weekday} this #{@month}").to_a
if date[3].nil?
day = ''UNDEF''.chomp
else
day = date[3]
end
%>
All I have to do now is to set $weeknumber and $weekday and the rest is
calculated by date.erb... Maybe not the pretties code out there, but as I
said - extremely early in the development.
Matt, of course it was wrong, thanks for pointing that out. The month
should have been 12, not 20. Darn typos.
Regards,
Alexander
On Mon, Nov 5, 2012 at 2:48 PM, Dan White <ygor@comcast.net> wrote:
> 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.davidsen@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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Puppet Users" group.
> To post to this group, send email to puppet-users@googlegroups.com.
> To unsubscribe from this group, send email to
> puppet-users+unsubscribe@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/puppet-users?hl=en.
>
> --
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> "Puppet Users" group.
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>
>
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