I use Ansible to update machines en masse. List your machines in your inventory file and then run `ansible $GROUPNAME -m command -bK -a "$UPGRADECOMMAND"`. Gr

I use Ansible to update machines en masse. List your machines in your inventory file and then run `ansible $GROUPNAME -m command -bK -a "$UPGRADECOMMAND"`. Groups are especially useful if you have machines with different Linux distros that use different commands. I understand it's even possible to use Ansible to manage Windows machines. Of course, now you have to be really careful to guard access to your Ansible setup...