Description of problem:
Neutron provides the capability to assign DNS names to ports through the DNS extension. Historically that was automatic, and now nova uses the DNS extension in neutron when found to fill in the dns details.
While Core OVN is capable of responding to DNS queries and forwarding them as necessary networking-ovn mechanism driver doesn't still implement that. It'd be highly desirable for parity reasons to support that feature.
Support of the dns neutron extension, and enablement of the dns related tests.
Some examples of how to configure it at OVN level: https://github.com/openvswitch/ovs/blob/adabd65ddd8217cf1a27f654136ff74d4fd544bf/tests/ovn.at#L6598
As per @numans explanation, this feature works by capturing any DNS request, and responding locally on OVN controller if we have an answer, otherwise the packet is released back to the openflow pipeline and will reach the normal DNS server if that was configured via DHCP.
One thing that we could have here missing compared to neutron is the ability to do inverse resolution, but that could be easily added to core-ovn later.
https://review.openstack.org/#/c/522215/ is merged
It was verified, but two bugs were opened:
1581332 and 1577592
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.