Configure internal DNS with DNS forwarding

To use this you need to remove any dns servers explitly set on a subnet:

openstack subnet unset --dns-nameserver 131.111.12.20

to switch to using the DNS servers provided by the DHCP agent.

See: https://docs.openstack.org/neutron/ussuri/admin/config-dns-int.html

People in our team seem keen to use this feature.

People in our team aren't really, which is why it wasn't enabled previously. Since we boot a lot of critical infra to shared provider networks, the single + only dns_domain entry can screw up FQDNs on instances on those networks for instances sitting on multiple networks.

Ahh, I see. I was mainly proposing it to get your thoughts on it to be honest. I see the issue now, will close.

closed

Would deploying+configuring Designate when we're at U (or V or W) square the circle in that your team would quite like well-functioning OpenStack-internal DNS divorced from external DNS sources, but we'd also still be free to over-ride it and set external DNS on subnets for ports where we need to?