I've just had a VMware ESXi 4.0 in front of me, which needed an upgrade. Not a big deal if you're able to find the right KB articles on their website...
OK, so here are the steps to upgrade a VMware ESXi 4.0 to a VMware ...

As the title indicates, this article will show you an example usage of chroot, where we'll clone our currently running system into a disk-image (dd). Doing that, we can afterwards loop-mount it, chroot in it and let all the stuff run, that we don't want on our mainbox ...