Puppet node definitions via CouchDB

example_node.json

{
   "_id": "a58af3e3e43733657152f59865021e0f",
   "_rev": "28-c7d4a44d4c176886cf742ebec4876550",
   "classes": [
       "balancer"
   ],
   "host": "example.com",
   "directors": [
       {
           "name": "temp",
           "backends": [
               {
                   "name": "example",
                   "ip": ""
               }
           ]
       }
   ],
   "ip": "192.168.0.99",
   "stomp_server": "192.168.0.33",
   "user": "system"
}

node_classifier.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'couchrest'
require 'yaml'

@db = CouchRest.database!("user:pass@your.couchdb.provider.com/nodes")

@db.view("list/all")['rows'].reject { | node | node['key']['host'] != ARGV[0] }.each do | node |
 
  @classes = [] + node['key']['classes'].to_a

  @node_definition = {
    "classes" => @classes,
    "environment" => "production",
    "parameters" => node['key']
  }

  puts @node_definition.to_yaml

end

nodes.pp

class balancer {
  include varnish
  include mcollective
}