One reason of the confusion is, in some virt driver (maybe xenapi or vmwareapi), one compute service manages multiple node.
--jyh > -----Original Message----- > From: Chris Friesen [mailto:chris.frie...@windriver.com] > Sent: Friday, February 28, 2014 7:40 AM > To: openstack-dev@lists.openstack.org > Subject: [openstack-dev] inconsistent naming? node vs host vs vs > hypervisor_hostname vs OS-EXT-SRV-ATTR:host > > Hi, > > I've been working with OpenStack for a while now but I'm still a bit > fuzzy on the precise meaning of some of the terminology. > > It seems reasonably clear that a "node" is a computer running at least > one component of an Openstack system. > > However, "nova service-list" talks about the "host" that a given service > runs on. Shouldn't that be "node"? Normally "host" is used to > distinguish from "guest", but that doesn't really make sense for a > dedicated controller node. > > "nova show" reports "OS-EXT-SRV-ATTR:host" and > "OS-EXT-SRV-ATTR:hypervisor_hostname" for an instance. What is the > distinction between the two and how do they relate to OpenStack "nodes" > or the "host" names in "nova service-list"? > > "nova hypervisor-list" uses the term "hypervisor hostname", but "nova > hypervisor-stats" talks about "compute nodes". Is this distinction > accurate or should they both use the hypervisor terminology? What is > the distinction between hypervisor/host/node? > > "nova host-list" reports "host_name", but seems to include all services. > Does "host_name" correspond to host, hypervisor_host, or node? And > just to make things interesting, the other "nova host-*" commands only > work on compute hosts, so maybe "nova host-list" should only output info > for systems running nova-compute? > > > Thanks, > Chris > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev