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 _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
