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On Mon, Apr 23, 2018 at 8:09 PM, Dan Sneddon <dsneddon at redhat.com> wrote:

> We could add the ControlPlaneDefaultRoute and ControlPlaneSubnetCidr to
> network_data.yaml, but this would involve some duplication of configuration
> data, since those are currently defined in undercloud.conf. A more robust
> solution might be to generate network_data.yaml from that info in
> undercloud.conf, but currently we don't modify any files in the
> tripleo-heat-templates package after it gets installed.

Right, it seems getting those values from Neutron is better.

> I can't speak to the roadmap of Heat/Neutron/Nova on the undercloud, for the
> immediate future I don't see us moving away from Heat entirely due to
> upgrade requirements.
>
> I can see another use case for this Heat functionality, which is that I
> would like to be able to generate a report using Heat that lists all the
> ports in use in the entire deployment. This would be generated
> post-deployment, and could be used to populate an external DNS server, or
> simply to report on which IPs belong to which nodes.

Jiri wrote a small tool that does mostly that:
https://gist.github.com/jistr/ad385d77db7600c18e8d52652358b616
We could make that more official, but we already have the info.

-- 
Thomas