All rackspace image/flavor combos

Vagrantfile

require 'fog'

service = Fog::Compute.new({
  :provider             => 'rackspace',
  :rackspace_username   => Fog.credentials[:rackspace_username],
  :rackspace_api_key    => Fog.credentials[:rackspace_api_key],
  :version => :v2,  # Use Next Gen Cloud Servers
  :rackspace_region => :dfw
})

nodes = []
images = service.images
flavors = service.flavors
images.each do | image |
  flavors.each do | flavor |
    nodes << {
  :name => "f#{flavor.id}_i#{image.id}",
	:image => image.name,
	:flavor => flavor.name
    }
  end
end

# Uncomment this if you just want to try the first couple to make sure this script is working
# nodes = nodes.slice(0, 5)

Vagrant.configure("2") do |config|
  config.vm.box = "dummy"
  config.ssh.private_key_path = "~/.ssh/id_rsa"

  nodes.each do | node|
    config.vm.define node[:name]

    config.vm.provider :rackspace do |rs|
      rs.username = Fog.credentials[:rackspace_username]
      rs.api_key  = Fog.credentials[:rackspace_api_key] 
      rs.flavor   = node[:flavor]
      rs.image    = node[:image]
      rs.public_key_path = "~/.ssh/id_rsa.pub"
    end
  end
end