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Rebooting with DevStack?

I am getting mixed results, so I will ask the question.

I have OpenStack setup through Devstack scripts. I have about 20 images, and about 9 running VMs and I need to reboot the host.

From what I have read, after rebooting, I can run ./ followed by a ./rejoin-stack and APPARENTLY this will somehow re-register all 20 of my images(VMs too?).

Could someone confirm this for me?

My Goal:

Reboot the system and retain the users, the images and all those settings. I am not overly worried about the VMs themselves, as I can always re-create them.

Thanks for any input