[openstack-dev] [Nova] should 'ip address' be retrived when decribe host?

Lingxian Kong anlin.kong at gmail.com
Wed Dec 31 06:20:18 UTC 2014

Thanks Kevin for your clarification, which further affirms my belief
that ip address should be included in the host info.

I will contact Jay Pipes on IRC, to see what can I help towards this
effort, soon after the New Year's Day in China. :)

2014-12-31 0:34 GMT+08:00 Kevin L. Mitchell <kevin.mitchell at rackspace.com>:
> On Tue, 2014-12-30 at 14:52 +0800, Lingxian Kong wrote:
>> Just as what Jay Lau said, 'nova hypervisor-show <hypervisor_id>'
>> indeed returns host ip address, and there are more other information
>> included than 'nova host-describe <hostname>'. I feel a little
>> confused about the 'host' and 'hypervisor', what's the difference
>> between them? For cloud operator, maybe 'host' is more usefull and
>> intuitive for management than 'hypervisor'. From the implementation
>> perspective, both 'compute_nodes' and 'services' database tables are
>> used for them. Should them be combined for more common use cases?
> Well, the host and the hypervisor are conceptually distinct objects.
> The hypervisor is, obviously, the thing on which all the VMs run.  The
> host, though, is the node running the corresponding nova-compute
> service, which may be separate from the hypervisor.  For instance, on
> Xen-based setups, the host runs in a VM on the hypervisor.  There has
> also been discussion of allowing one host to be responsible for multiple
> hypervisors, which would be useful for providers with large numbers of
> hypervisors.
> --
> Kevin L. Mitchell <kevin.mitchell at rackspace.com>
> Rackspace
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Lingxian Kong

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