I think this is related to stack - neutron - dhcp agent config inside the undercloud configuration...
Cos management interface are in dhcp-client mode on baremetals and on each boot i think the take hostname via dhcp... Or some think alike :-/

On Fri, Oct 16, 2015, 13:25 Marius Cornea <mcornea@redhat.com> wrote:

Nice catch, I was able to reproduce it on my system and reported it here:
https://bugzilla.redhat.com/show_bug.cgi?id=1272376

----- Original Message -----
> From: "AliReza Taleghani" <shayne.alone@gmail.com>
> To: rdo-list@redhat.com
> Sent: Friday, October 16, 2015 9:22:53 AM
> Subject: Re: [Rdo-list] Overcloud nodes host-name persistence
>
> if you update hostname via hostnamectl and restart nova-compute service
> without reboot it works! but rebooting will cause new hostname is place :-/
>
> Sincerely,
> Ali R. Taleghani
> @linkedIn
>
> On Fri, Oct 16, 2015 at 10:49 AM, AliReza Taleghani < shayne.alone@gmail.com
> > wrote:
>
>
>
> It seem that If you restart bare metal servers! there will be a problem after
> boot that the node will be register it self with a different name rather
> than the one used on deployment!
>
>
> as the attachment shown the failed compute node is registered with new name:
> => overcloud-novacompute-2.localdomain
> as it was
> => overcloud-novacompute-2
> during deployment!
>
> I check:
> ```
> [heat-admin@overcloud-novacompute-2 ~]$ sudo hostnamectl set-hostname
> --transient overcloud-novacompute-2
> [heat-admin@overcloud-novacompute-2 ~]$ sudo hostnamectl set-hostname
> overcloud-novacompute-2
> ````
> but after reboot the server again append localdomain to iit's hostname
>
> Sincerely,
> Ali R. Taleghani
> @linkedIn
>
>
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--

Sincerely,
Ali R. Taleghani