Hi,
On 01/24/2012 10:09 AM, Alexandre Fouché wrote:
> I find it logical that my 'BackupPC.conf' apache file is put after the
> apache package is installed, or more broadly after the apache class is
> complete. Afterwards, i put the 'BackupPC.conf' conf, and then
> afterwards, i want to notify Exec['apache-reload'], that it needs to
> reload. To me, the notify is a good way to ensure the apache class does
> not have to know anything about the backup class, and stay generic,
> while at the same time ensuring that the backup class can notify the
> apache service if it thinks it needs to.
Your outset looks a bit contradictory to me. Yes, requiring
Class["apache"] is sound design. But notifying a resource decalred
*within* that class is the complete opposite of that.
A better solution will take care of your problem as well.
> Unfortunately, the 'notify' is acting as a 'before' and creates a
> dependency cycle. It breaks the scheme of being able to keep the apache
> class generic yet able to respond to notifications
Think about it. You want puppet to send a notification to a resource.
Puppet must decide whether this notification gets sent. So it must
process the notifying resource. After that, *if* a notification was in
fact generated, it can process the notified resource. The opposite order
cannot be achieved. Therefore, notifies and subscriptions imply
before/requires relationships.
I suggest you add a class
apache::service {
...
}
with whatever implementation you choose for your reload (in most cases
you want to notify a service resource instead of an exec, but it's not
more than a rule of thumb).
The you can go ahead and require Class[apache] but notify
Class[apache::service]. For good measure, class apache will likely
include apache::service.
Hope this makes sense to you.
Cheers,
Felix
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