Re: [Puppet Users] using classes like functions

[Christopher Wood]

Reposting my answer to a similar thread:

https://groups.google.com/d/msg/puppet-users/xAhvtWetin4/cw4OOuNfCcIJ

Short version: use a define.

http://docs.puppetlabs.com/guides/language_guide.html#defined-resource-types

On Mon, Aug 13, 2012 at 05:17:13PM -0700, Kevin G. wrote:
> I'm pretty sure I'm coming at this from the wrong direction, if anybody
> could point me to what the puppet idiom should be here I'd really
> appreciate it.
> I'd like to install two instances of this service on this host, with
> different parameters:
>
> node /^memcache\d+.util.foo.com$/  { 
>     class {'memcached': pool_index => 1, port => 11211 }
>     class {'memcached': pool_index => 2, port => 11212 }  
> }
>
> The class itself uses the parameters something like this (abridged):
>
> class memcached ($pool_index = undef, $port = 11211) {
>     daemontools_service::s {
>         memcached:
>             service_name => "memcached${pool_index}",
>             command      => "exec memcached -v -m 2048 -p ${port} "
>     }
> }
>
> But the first part throws this error: Duplicate declaration:
> Class[Memcached] is already declared in file...cannot redeclare.
> I was thinking a parameterized class was something you could call like a
> function, but apparently not.  What's the right way to set that up twice,
> with different parameters?
>
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[Kevin G.]

Short version: use a define.

http://docs.puppetlabs.com/guides/language_guide.html#defined-resource-types

 

That's it, thanks!