How do you enable the DNS extension to ml2 in OpenStack?

Question

In one doc it says,

To enable the internal DNS resolution, the neutron-server service must be configured with the dns_domain config option set to a value other than openstacklocal in neutron.conf file and the dns extension driver must be enabled in the ml2_conf.ini file. In order to enable internal DNS resolution, the user must set the enable-ml2-dns to True. The default value is False in order to provide backwards compatibility with existing deployments.

In another doc it says this

Add dns to extension_drivers in the [ml2] section of /etc/neutron/plugins/ml2/ml2_conf.ini. The following is an example:

[ml2]
extension_drivers = port_security,dns

Which method is the correct method for enabling the ml2 dns extension? Are we setting the enable-ml2-dns to true, or adding a dns driver in the extension_drivers list?

Answer 1

The first link charm - is for an Openstack deployed with Charm.

The second doc is correct. The file at /etc/neutron/plugins/ml2/ml2_conf.ini should be changed on the controllers. But the exact location will depend on how Openstack was deployed.