Serial console support in Grub2

This is another one of those "just so I don't forget" posts. I'm working towards migrating from IPA in a KVM-based virtual machine running CentOS 6 to one running CentOS 7 and the way of making serial consoles work in 7 is different than it was in 6 because CentOS 7 (and thus RHEL7) use Grub2.

Instead of editing /boot/grub.cfg, you need to edit /etc/defaults/grub and add:

GRUB_TERMINAL="serial" GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200"

The above will enable Grub output to ...

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