On Aug 15, 4:02 pm, Rich Rauenzahn <rraue...@gmail.com> wrote:
> Is it possible to do something like this within the new scoping rules?
> It seems that $::IMSPECIAL doesn't refer to the decl in node a. And
> I can't use class parms as the variable is evaluated in a base class.
>
> Suggestions? Currently using puppet 2.7.1
>
> node a {
> $IMSPECIAL=true
> include foo
>
> }
>
> class bar {
> if $IMSPECIAL {
> notice("I'm special!")
> }
>
> }
>
> class foo inherits bar {
>
> // other stuff...
>
>
>
> }
So, variables inside node definitions are not global. In fact, it
appears that in Puppet 2.8 they will not be accessible at all outside
the node definition in which they appear, except possibly in node
definitions that inherit them.
There are a lot of ways you could handle this, among them:
- if you are using an ENC, then you should probably be configuring
that to set the variable; otherwise,
- if you are willing to allow and trust nodes to tell you the
appropriate value of $IMSPECIAL, then you could make it a cusom fact;
or
- you can use extlookup() to set the value of $IMSPECIAL, either
globally, or (better) locally wherever you need it.
- You could also put this before (outside) the first node definition:
$IMSPECIAL = $hostname ? {
'a' => true,
default => false
}
- Alternatively, you could wrap that in a (non-parameterized class),
and refer to it as a class variable:
node a {
include foo
}
class special_nodes {
$IMSPECIAL = $hostname ? {
'a' => true,
default => false
}
}
class bar {
include 'special_nodes'
if $special-nodes::IMSPECIAL {
notice("I'm special!")
}
}
Of those, I would recommend either extlookup() or your ENC (if you
have one), with my personal preference being extlookup(). I think
Hiera may offer an even better solution (though similar to
extlookup()), but I'm not familiar enough with it to feel comfortable
recommending it.
John
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