On 3/19/12 3:55 PM, Alessandro Franceschi wrote:
> Just a quick note, not strictly related to your question
> Be careful when including classes with nodes' inheritance: if you set a
> variable, for example, in the node "web" that is used by classes
> included in the baseline class, that variable' value will be ignored.
> It's a typical "variables scoping issue" that has contributed to the bad
> reputation of the nodes' inheritance layout.
>
> My rule of thumb is:
> Use node's inheritance ONLY to set and override variables, and include
> classes ONLY at the $hostname node level (at the ned of the inheritance
> tree)
> To avoid duplications you case still include webstuff there and in the
> webstaff class "include baseline".
>
> Sadly this whole nodes' inheritance use to dynamically override
> variables will break in the next version of Puppet.
> ( for more info http://docs.puppetlabs.com/guides/scope_and_puppet.html )
>
> al
>
> On Thursday, March 15, 2012 6:13:33 PM UTC+1, octomeow wrote:
>
> Hi
>
> I have a very simple set up
>
> node default {
> #declare classes for all nodes
> include baseline
> }
> node app inherits default {
> include appstuff
> }
>
> node web inherits default {
> iclude websutff
> }
>
> HOWEVER, I'm getting notification that node "web" is applying class
> appstuff
> how could something like that happen? Any advice?
>
I would strongly encourage you to never use inheritance with nodes and
only to use inheritance within a given module[1].
Instead of
node default {
include baseline
}
node app inherits default {
include appstuff
}
I would recommend
node default {}
node app {
include baseline # though, I recommend this is named 'common'
include appstuff
}
[1] - http://docs.puppetlabs.com/guides/style_guide.html#class-inheritance
-g
--
Garrett Honeycutt
206.414.8658
http://puppetlabs.com
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