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Hello,
No, it is not possible, for many possible reasons. In nova, you cannot simply live / cold migrate across hypervisors. Plus, there are many other things to consider, like adding / removing certain drivers (VirtIO, Linux Integration Services, etc.).
The easiest approach to this would be using Coriolis [1], which will help you migrate your VMs accross hypervisors, and to / from public clouds like Azure, AWS, etc. Not to mention that it has integration with Keystone, which means that it'll magically fit in your OpenStack deployment.
[1] https://cloudbase.it/coriolis/
Best regards,
Claudiu Belu
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