Booting a Gentoo LiveCD ISO image from the disk

To boot an ISO image, in many cases you don't really need a CD/DVD or even a USB stick. A quick and easy way to checkout a new distro is to run it under a VM (via qemu/kvm or any of the other options) and if you like it, you can then just add a grub entry to be able to boot it up on baremetal directly from the hard disk. Here's a grub entry I added recently to boot the last Gentoo LiveCD ISO…