On Jun 22, 4:27 pm, PBWebGuy <pbweb...@gmail.com> wrote:
> I have a simple sample below that illustrates a problem I ran into
> today. What I am trying do is execute a command only if another
> class, that which is dependent on it's class, triggers the command
> with a notify. I'm using the refreshonly => true to prevent it from
> running unless something triggers it. The require is needed because
> other things need to be done in class a before class b.
>
> When I run this code I get the following error message:
>
> err: Could not apply complete catalog: Found dependency cycles in the
> following relationships
>
> Am I doing something wrong?
Yes. Your scenario does not make sense: if Class['b'] requires
Class['a'], then each resource in Class['b'] requires every resource
in Class['a'], by definition. Therefore, if any resource in
Class['b'] also has a 'notify' or 'before' relationship with a
resource in Class['a'] then that closes a dependency cycle. ('Notify'
is 'before' plus a few extra bits.)
> I think my only solution is to move the Exec[a] out of class a but I
> would think that this should work...
That's perhaps the least disruptive solution, but by no means the only
one. There are all sorts of ways you could refactor your
dependencies. Among them, you could replace the inter-Class
dependency with the needed inter-resource dependencies, which
evidently are a subset of those implied by your intercalss
dependency. Dependency cycles often do signal classification
problems, however, and I think that's probably the case here.
While I'm on my soapbox, this is one reason why I don't like
interclass dependencies very much, and why run stages (which magnify
this problem) need to be approached with caution. There is certainly
something to be said for the layer of abstraction achieved by relying
on interclass dependencies instead of on finer-grained inter-resource
dependencies, but you can't do it halfway.
John
--
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+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/puppet-users?hl=en.
