How can I find out what ml2 extension drivers are enabled?

Question

According to this document on "The Networking service internal DNS resolution", a feature I need requires the dns extension driver in OpenStack,

[ml2]
extension_drivers = port_security,dns

How can I find what extension drivers my OpenStack's ml2 has?

Answer 1

I was able to test this in my lab.

• Deployed with kolla ansible.
• Currently running Ussuri

If I add the dns driver to the ml2 config, I am now able to resolve network ports DNS through the dnsmasq inside my private network.

(venv) laurentdumont@openstack-deployer:/etc/kolla$ openstack port show 046068ee-4b1a-47b5-bfdb-91af916de1ee -c dns_assignment
+----------------+------------------------------------------------------------------------------------------+
| Field          | Value                                                                                    |
+----------------+------------------------------------------------------------------------------------------+
| dns_assignment | fqdn='test-dns.os.coldnorthadmin.com.', hostname='test-dns', ip_address='10.100.100.112' |
+----------------+------------------------------------------------------------------------------------------+

In this case, the VM has one port and the port takes the name of the VM.

# nslookup -type=A test-dns.os.coldnorthadmin.com 10.100.100.2
Server:     10.100.100.2
Address:    10.100.100.2:53

Name:   test-dns.os.coldnorthadmin.com
Address: 10.100.100.112