Open Stack

Hello,

I'm investigating various loose ends for a pending open stack
deployment, and one of the things I'd like to be able to do is to affect
the hostname in the instance metadata (for instance in the metadata
returned by nova-api-metadata on the compute nodes).   This metadata has
various meanings in our puppet config, so having some influence over it
would be useful to us.  What I'm aiming for, roughly is something like
what the ec2 facts in puppet give you back when running on aws,
something like:

ec2_hostname => ip-10-226-51-162.eu-west-1.compute.internal
ec2_local_hostname => ip-10-226-51-162.eu-west-1.compute.internal
ec2_local_ipv4 => 10.226.51.162
ec2_public_hostname => ec2-79-125-8-220.eu-west-1.compute.amazonaws.com
ec2_public_ipv4 => 79.125.8.220

It seems like there is some provision for this:
nova/compute/api.py:

        display_name = instance.get('display_name')
        if display_name is None:
            display_name = self._default_display_name(instance_id)

        hostname = instance.get('hostname')
        if hostname is None:
            hostname = display_name

but instance can't have display_name or hostname set at create time, as
the api doesn't allow for it, so both always end up as 'server NN' as
far as I can tell.

Am I missing a knob to tweak?  I don't mind maintaining a small local
patch set to generate a different _default_display_name, but it seems
like it might be nicer to have this be templateable.

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk

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