How to enable OVN Octavia provider driver with devstack

To enable the utilization of OVN as the provider driver for Octavia through devstack:

1. You can start with the sample DevStack configuration file for OVN that kuryr-kubernetes comes with.

   $ curl https://opendev.org/openstack/kuryr-kubernetes/raw/branch/master/devstack/local.conf.sample \
     -o devstack/local.conf
   

2. In case you want more Kuryr specific features than provided by the default handlers and more handlers are enabled, for example, the following enables NetworkPolicies in addition to the default features:

   KURYR_ENABLED_HANDLERS=vif,kuryrport,service,endpoints,kuryrloadbalancer,
   namespace,pod_label,policy,kuryrnetworkpolicy,kuryrnetwork
   

   Then, the proper subnet drivers need to be set:

   KURYR_SG_DRIVER=policy
   KURYR_SUBNET_DRIVER=namespace
   

3. Run DevStack.

   $ ./stack.sh
   

Enabling Kuryr support for OVN Octavia driver via ConfigMap

Alternatively, you can enable Kuryr support for the OVN Octavia driver on the Kuryr ConfigMap, in case the options are not set at the local.conf file. On DevStack deployment, the Kuryr ConfigMap can be edited using:

$ kubectl -n kube-system edit cm kuryr-config

The following options need to be set at the ConfigMap:

[kubernetes]
endpoints_driver_octavia_provider = ovn

[octavia_defaults]
lb_algorithm = SOURCE_IP_PORT
enforce_sg_rules = False
member_mode = L2

Make sure to keep correct indentation when doing changes. To enforce the new settings, you need to restart kuryr-controller by simply killing existing pod. Deployment controller will make sure to restart the pod with new configuration.

Kuryr automatically handles the recreation of already created services/load balancers, so that all of them have the same Octavia provider.

Testing ovn-octavia driver support

Once the environment is ready, you can test that network connectivity works and verify that Kuryr creates the load balancer for the service with the OVN provider specified in the ConfigMap. To do that check out Testing Network Connectivity.

You can also manually create a load balancer in Openstack:

$ openstack loadbalancer create --vip-network-id public --provider ovn
+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| admin_state_up      | True                                 |
| availability_zone   | None                                 |
| created_at          | 2020-12-09T14:45:08                  |
| description         |                                      |
| flavor_id           | None                                 |
| id                  | 94e7c431-912b-496c-a247-d52875d44ac7 |
| listeners           |                                      |
| name                |                                      |
| operating_status    | OFFLINE                              |
| pools               |                                      |
| project_id          | af820b57868c4864957d523fb32ccfba     |
| provider            | ovn                                  |
| provisioning_status | PENDING_CREATE                       |
| updated_at          | None                                 |
| vip_address         | 172.24.4.9                           |
| vip_network_id      | ee97665d-69d0-4995-a275-27855359956a |
| vip_port_id         | c98e52d0-5965-4b22-8a17-a374f4399193 |
| vip_qos_policy_id   | None                                 |
| vip_subnet_id       | 3eed0c05-6527-400e-bb80-df6e59d248f1 |
+---------------------+--------------------------------------+