Tacker fails to register openstack VIM

[Louis Li]

I am using Tacker (master commit 46a28fc8) with devstack to connect external openstack.

I register VIM with config:
auth_url: 'http://keystone.ocloud.test/v3' # I also tried 'http://keystone.ocloud.test'
username: 'admin'
password: 'xxxxxx'
project_name: 'admin'
project_domain_name: 'Default'
user_domain_name: 'Default'
#cert_verify: 'False'

Run command "openstack vim register --config-file ./vim_config_openstack.yaml vim-openstack" response internal error.

I trace tacker source code, and find cause.

In tacker/tacker/nfvo/drivers/vim/openstack_driver.py:
OpenStack_Driver::register_vim
   self.discover_placement_attr(vim_obj, ks_client)
     regions = self._find_regions(ks_client)
       resp = ks_client.get('/v3/regions')

_find_regions calls ks_client.get with '/v3/regions'.
However, I capture the http packet and find that the real request URL sent to VIM is '/v3/v3/regions'.

After moidfy the code to ks_client.get('/regions'), openstack VIM can register success.

I am not sure this is tacker's BUG, keystoneauth1's BUG or I misconfig something.

[Kenta Fukaya (fukayan)]

Hi, thanks for your report.
In order to determine the cause, could you give me the following information?

- version of keystoneauth1
- endpoint URL of keystone

[Louis Li (gamerslouis)]

## Dev stack
DevStack Version: 2023.1
Change: 7533276c0a008bb84a58881494b1d627ec7bdcb9 Merge "Remove the neutron bash completion installation" 2023-02-02 00:50:10 +0000
OS Version: Ubuntu 20.04 focal

## pip freeze
keystoneauth1==5.1.1
keystonemiddleware==10.2.0
python-keystoneclient==5.0.1
python-tackerclient==1.12.0
-e git+https://opendev.org/openstack/tacker@46a28fc8a20efb6e5df79a3ffe2d525228e96681#egg=tacker
-e git+https://opendev.org/openstack/tacker-horizon.git@ef2bebf58ede4dc53d0b2adf7fe35a389405763f#egg=tacker_horizon

## openstack endpoint list
keystone endpoint: http://10.10.0.78/identity