Vagrant vms generator

readme.txt

My Chef recipes behave different if they're used in a single box or within a cluster of boxes.
This script helps me to generate Vagrant configurations for each one of my possible scenarios.

Vagrantfile

require './vms_init'

Vagrant::Config.run do |config|
  @vms.each do |vm|
    config.vm.define vm.id do |definition|
      definition.vm.box = "lucid64"

      definition.vm.network :hostonly, vm.hostname

      definition.vm.provision :chef_solo do |chef|
        Array(vm.recipes).each do |recipe|
          chef.add_recipe recipe
        end

        chef.json vm.dna
      end
    end
  end
end

vms_init.rb

require 'erb'
require 'json'

class Vm < Struct.new(:id, :role, :hostname, :recipes)
  def initialize(*args)
    super
  end

  def dna_file
    "#{role}.json"
  end

  def dna
    JSON.parse(File.read(dna_file))
  end
end

# Define the vms that you want to boot
@app_master = Vm.new('app_master', 'app_master', '192.148.100.10', 'base::app_master')
@app_slave  = Vm.new('app_slave',  'app',        '192.148.100.11', 'base::app')
@db_master  = Vm.new('db_master',  'db_master',  '192.148.100.12', 'base::db_master')

@vms = [@app_master, @app_slave, @db_master]

@vms.each do |vm|
  @node = vm

  # Generate a json file per vm role
  template = ERB.new File.read('dna.json.erb')
  File.open(@node.dna_file, 'w') {|f| f.write template.result}
end