device_owner in openstack.network.v2.port.Port incorrect after creating instance

[Vinicius G Ferreira]

After wasting about 1h on chasing a problem, I noticed the cause was the openstack.network.v2.port.Port object had an incorrect value for the device_owner attribute after creating an instance. I was expecting it to have the value 'compute:nova' (which is shown when we create the instance using the Horizon console), but the actual value when we use the Unified SDK is 'compute:None'.

Here is a minimal example that demonstrates the issue:

----------

from openstack import connection
import json
import os

def get_connection_to_services(auth_url, username, password, user_domain_name, project_name, project_domain_name):
    conn = connection.Connection(
        auth_url=auth_url,
        project_name=project_name,
        project_domain_name=project_domain_name,
        username=username,
        user_domain_name=user_domain_name,
        password=password)
    return conn

inputfile = my_credentials_file

with open(inputfile) as json_file:
    json_string = json_file.read()
    json_obj = json.loads(json_string)

username = json_obj["username"]
password = json_obj["password"]
auth_url_sdk = json_obj["auth_url_sdk"]
user_domain_name = json_obj["user_domain_name"]
project_domain_name = json_obj["project_domain_name"]
project_name = json_obj["project_name"]

conn = get_connection_to_services(
       auth_url=auth_url_sdk,
       project_name=project_name,
       project_domain_name=project_domain_name,
       username=username,
       user_domain_name=user_domain_name,
       password=password)
compute_service = conn.compute
network_service = conn.network
image_service = conn.image
block_service = conn.block_store

# Network is using the id for 'private' and imageRef the id for 'Cirros'
compute_service.create_server(
name="Teste",
flavor_id=1,
networks=[{'uuid': '9ffae962-0287-44d5-ad2f-e692b180d369', 'fixed_ip': '10.0.0.88'}],
security_groups=[{'name': 'default'}],
imageRef='48c05e01-63a1-483c-a4de-3a256034b89a'
)

for i in network_service.ports():
    if i['device_owner'] == 'compute:None':
        print i

[Brian Curtin (brian.curtin)]

We just take the JSON that comes back in the device_owner field, so that's what the server is giving us.

[Vinicius G Ferreira (vini-g-fer)]

Indeed, that value is being recorded in the database, as this query shows:

mysql> select device_owner from neutron.ports;
+------------------------+
| device_owner |
+------------------------+
| network:floatingip |
| network:floatingip |
| network:router_gateway |
| compute:None |
| compute:nova |
| network:dhcp |
| network:router_interface |
| network:router_interface |
+------------------------+
8 rows in set (0.00 sec)

However I don't understand why Horizon is recording a correct value, and the SDK/API is not. I also tested the CLI, and the same problem occurs.