'centos-6'.tap do |box|
    config.vm.define box, define_opts do |config|
      config.vm.box = 'elastic/centos-6-x86_64'
      rpm_common config, box
    end
  end
  'centos-7'.tap do |box|
    config.vm.define box, define_opts do |config|
      config.vm.box = 'elastic/centos-7-x86_64'
      rpm_common config, box
      rpm_docker config
    end
  end
  'oel-6'.tap do |box|
    config.vm.define box, define_opts do |config|