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
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