More info on underlying tech please

I'd love to learn more about the tech stack. Any blog posts I can refer to? How come you decided not to use Docker for something like this? Seems perfectly suited.

Your demos show impressive speed in booting, machine resizing, and snapshotting. Kudos.

With that said, several hypervisors do support hot-resizing, snapshotting, and cross machine migration. Xen has excellent hot resize support, where VMWare has pushed hard for live migration and proper snapshotting over the years.

It starts very fast! Is it based on lxc? or some other container?

It's OpenVZ or Virtuozzo.

http://openvz.org/

http://www.parallels.com/products/pvc/