[watcher] Question about baremetal node support in nova CDM

Matt Riedemann mriedemos at gmail.com
Fri May 24 19:27:18 UTC 2019

On 5/24/2019 1:39 AM, info at dantalion.nl wrote:
> I think we should look into if bare metal
> nodes are stored in the compute_model as I think it would more sense to
> filter them out.

The tricky thing with this would be there isn't a great way to identify 
a baremetal node from a kvm node, for example. There is a 
hypervisor_type column on the compute_nodes table in the nova cell DB, 
but it's not exposed in the API.

Two obvious differences would be:

1. The hypervisor_hostname on an ironic node in the os-hypervisors API 
is a UUID rather than a normal hostname. That could be one way to try 
and identify an ironic node (hypervisor).

2. For servers, the associated flavor should have a CUSTOM resource 
class extra spec associated with it and the VCPU, DISK_GB, and MEMORY_MB 
resource classes should also be zero'ed out in the flavor per [1]. The 
server OS-EXT-SRV-ATTR:hypervisor_hostname field would also be a UUID 
like above (the UUID is the ironic node ID).





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