I guess depending on the hardware and software that you have/require. Google's Ganeti [1] is pretty easy to get going, and it is based on Linux Xen or KVM. Ther

I guess depending on the hardware and software that you have/require. Google's Ganeti [1] is pretty easy to get going, and it is based on Linux Xen or KVM. There is a hands on tutorial @ http://www.oscon.com/oscon2011/public/schedule/detail/18544 http://www.oscon.com/oscon2011/public/schedule/detail/18544 If you have hardware -- Ganeti basically allows you to create a Xen cluster of X nodes, create VMs, move them around the cluster (live migration if using DRBD), etc. I have several clusters with ~100 VMs and it has been rock solid. Ganeti is much better than trying to roll you own solution, and with live migration, it makes a nice alternative to VMware, just without the fancy GUI. [1] http://code.google.com/p/ganeti/ http://code.google.com/p/ganeti/