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.mitch...@rackspace.com> Rackspace _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
