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Volatile server builds and hybrid use cases

To: openstack@xxxxxxxxxxxxxxxxxxx
From: Daniel Pocock <daniel@xxxxxxxxxxxxx>
Date: Thu, 07 Feb 2013 10:22:58 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20121215 Iceowl/1.0b1 Icedove/3.0.11


I'm just wondering if anyone can comment on the following two topics:


a) volatile images - e.g. development servers where new packages are
installed every few days and where the entire system state must be
preserved on every reboot.  Can the whole cookie-cutter static image concept be bypassed and
the entire instance runs from persistent storage but still under the control of OpenStack?


b) hybrid deployments - e.g. if somebody already has 20 physical servers
running VMs with a vanilla Xen hypervisor, can they add Nova to those
servers and run some OpenStack managed VM instances alongside the
standalone images wherever they have spare CPU capacity?  Or do they need to move all the vanilla VMs onto 10
servers and then just run Nova on the other 10?