# File lib/deltacloud/drivers/rackspace/rackspace_driver.rb, line 122
  def run_on_instance(credentials, opts={})
    target = instance(credentials, :id => opts[:id])
    param = {}
    param[:credentials] = {
      :username => 'root',
      :password => opts[:password]
    }
    param[:port] = opts[:port] || '22'
    param[:ip] = target.public_addresses.first
    safely do
      Deltacloud::Runner.execute(opts[:cmd], param)
    end
  end