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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?

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This shouldn't be to hard, do an export in virtual box as described here

Then do an import on OpenStack as suggested here

Use Open Visualization Format 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.

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