ok, that make sense to me , thanks a lot

Best Regards!

Kevin (Chen) Ji 纪 晨

Engineer, zVM Development, CSTL
Notes: Chen CH Ji/China/IBM@IBMCN   Internet: jiche...@cn.ibm.com
Phone: +86-10-82454158
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District,
Beijing 100193, PRC



From:   "Kevin L. Mitchell" <kevin.mitch...@rackspace.com>
To:     <openstack-dev@lists.openstack.org>
Date:   12/31/2014 09:37 PM
Subject:        Re: [openstack-dev] [Nova] should 'ip address' be retrived when
            decribe host?



On Wed, 2014-12-31 at 20:56 +0100, Chen CH Ji wrote:
>               Sorry If I didn't understand clearly about it , looks to
> me the hypervisor itself hosts the instances and it should have a IP
> with it (like Linux host KVM instances, Linux is the hypervisor, the
> PC is the host)
>               while the host is physical node and only to be used by
> 'hypervisor' concept ,so I think maybe we don't need ip for the
> 'host' ?  thanks a lot

The hypervisor hosts the VMs, yes, but the component that sits between
the hypervisor and the rest of nova―that is, nova-compute―does not
necessarily reside on the hypervisor.  It is the nova-compute node
(which may be either a VM or a physical host) that is referred to by the
nova term "host".  For KVM, I believe the host is often the same as the
hypervisor, meaning that nova-compute runs directly on the hypervisor…
but this is not necessarily the case for all virt drivers.  For example,
the host for Xen-based installations is often a separate VM on the same
hypervisor, which would have its own distinct IP address.
--
Kevin L. Mitchell <kevin.mitch...@rackspace.com>
Rackspace


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