Open Stack

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.friesen at windriver.com]
> Sent: Friday, February 28, 2014 7:40 AM
> To: openstack-dev at 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
> 
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