[watcher] Question about baremetal node support in nova CDM

info at dantalion.nl info at dantalion.nl
Wed May 29 09:10:10 UTC 2019

If the hypervisor_type is only available in the nova cell DB how does
the OpenStackClient determine the hypervisor type?

If I execute 'openstack hypervisor list' then the Hypervisor Type column
is visible and correctly distinguishes between ironic and qemu hyervisors.

On 5/24/19 9:27 PM, Matt Riedemann wrote:
> 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).
> [1]
> https://docs.openstack.org/ironic/latest/install/configure-nova-flavors.html

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