Just digging back into running Proxmox and I was wondering if there are any lightweight distro's designed with VM use in mind. Specifically for use with HA clustering. Something that boots very fast, has a small disk and memory footprint to synchronize. For running services like named where you have very few dependencies.

Something like openWRT comes to mind. That use to run from a few MB of flash and ram. I'm wondering if there is something similar that is well maintained and x86 of course.