Monday, September 07th, 2009 | Author: Nico
After reading masterzen’s excellent blog post about puppet storedconfigs, it gave me the idea to create a system of subscription to services.
For example, if you want some client to subscribe to a “backup” service you can use the following little things :
# Subscription system through exported resources # A stupid idea of Nico <nico@gcu.info> # $subscribedir is defined somewhere else define set_subscription_to($title) { @@file { "$subscribedir/nodes/$title/$fqdn": content => "\n", tag => "$title" } define get_subscription_to($title) { file { "$subscribedir": ensure => directory, owner => root } file { "$subscribedir/nodes": ensure => directory, owner => root, require => File["$subscribedir"] } file { "$subscribedir/nodes/$title": ensure => directory, owner => root, require => File["$subscribedir/nodes"] } File <<| tag == $title |>> }
and in your manifests :
class client { set_subscription_to { "backup" : } } class server { get_subscription_to { "backup": } }
Then the server will be able to know which machines subscribed to something and then treat them by walking the associated folder ( $subscribedir/nodes/$title )
This can be really enhanced of course 
Have fun