I'm currently administering an Ubuntu box remotely. It's set to install security updates automatically, and it notifies me when I log in via ssh whether it has installed an update which requires a reboot. For example, if it installed a kernel update a few days ago, the update manager will touch a "reboot_required" file in /var/run, and when I ssh into the machine today I'll be greeted with a "System restart required" message. Is there a similar functionality for yum or Packagekit?