[openstack-dev] [nova][ceilometer] proposal to send bulk hypervisor stats data in periodic notifications

Kevin L. Mitchell kevin.mitchell at rackspace.com
Mon Jun 22 17:19:05 UTC 2015

On Mon, 2015-06-22 at 18:10 +0100, Daniel P. Berrange wrote:
> On Mon, Jun 22, 2015 at 11:10:40AM -0500, Kevin L. Mitchell wrote:
> > On Sat, 2015-06-20 at 21:35 +0100, Daniel P. Berrange wrote:
> > > In general I would say that is an unsupported deployment scenario to
> > > have other random virt guests running on a nova compute node.
> > 
> > On the other hand, this is exactly how compute nodes themselves are
> > often deployed—a random guest on the hypervisor node…
> In a devstack env maybe, but in production we expect the hypervisor to
> be exclusively used by Nova, or things Nova uses.

In production, at least in some Xen deployments, the hypervisor does not
run the nova-compute service; instead, we have a VM specifically set
aside for running the nova-compute.  This is done because the hypervisor
(in older Xen deployments, at least) has an old version of Python, and
because some operations are most conveniently done by a co-located
compute node.
Kevin L. Mitchell <kevin.mitchell at rackspace.com>

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