[Puppet Users] Override values from default node inheritance (variable scoping).

[Adrian van Dongen]

Hi,

I have a pretty basic question about variable scooping. We have been
using puppet for the past few weeks now and were running into some
problems which are probably caused by a lack of understanding or best
practices.

We have run into the following scenario and are not sure how to fix
this. The majority of our host all use the same resolvers in our
network (our internal dns servers) but there are a few node that are
an exception, they need to use external dns servers.

Our current puppet configuration has a default node template which
includes a "resolver" class. Every node inherits the default node
template.

So for some host we would like to change the the resolver address. If
we try to change this inside the node definition we get a "Duplicate
definition" error. From what we know this is to be expected because of
the variable scoping. We define companyname (see code snippet below)
twice, once in the default node and once in the node definition.

We currently fixed this by including the default node (class) instead
of inheriting it.

Although this solves our current problem we are wondering what the
best way to go is in this setup. Is there a way to override the values
with an default node of should we leave everything that isn't a "true
default" outside of the default node.

Thanks you in advance for you answer.

Regards,

Adrian.

Templates.pp:

node default_template {
...

include resolver

resolver::resolv_conf { "company":
        domainname  => "company.local",
        searchpath  => ['company.local'],
        nameservers => ['192.168.1.123', '192.168.1.124'],
}

...
}

Node configuration:

node "node.company.local" inherits default_template {
...
}

Resolver class:

class resolver {

    define resolv_conf($domainname = "$domain", $searchpath,
$nameservers) {
            file { "/etc/resolv.conf":
                    owner   => root,
                    group   => root,
                    mode    => 644,
                    content => template("resolver/resolv.conf.erb"),
            }
    }
}

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