I'm running OpenStack in Ubuntu Server 11.10 (installation did using devstack script), but I have some virtual machines that are already running using VirtualBox. How can I convert the VirtualBox machines to run in OpenStack and what is the best way to do it so I won't lose data when stop/restart these machines on OpenStack?
Shouldn't be to hard, do an export in virtual box http://grok.lsu.edu/article.aspx?articleid=13838
Then do an import on OpenStack http://docs.ganeti.org/ganeti/master/html/design-ovf-support.html
Use OVF as your export type and you should be ok. Depending on the size of your VM it may take a while, so plan for downtime.