Can't create a host when using a differen project than what blazar is setup with

[Sam Morrison]

It looks like blazar assumes that the user/project initiating a host-create command will be the same as the os_admin credentials specified in blazar.conf

If not host-create fails with the following error

2020-05-29 13:06:33.560 30541 ERROR blazar.api.v1.utils [-] Traceback (most recent call last):
  File "/opt/blazar/blazar/api/v1/utils.py", line 86, in handler
    return func(**kwargs)
  File "/opt/blazar/blazar/api/v1/oshosts/v1_0.py", line 42, in computehosts_create
    return api_utils.render(host=_api.create_computehost(data))
  File "/opt/blazar/blazar/utils/__init__.py", line 32, in __run_method
    return getattr(self.instance, __name)(*args, **kwargs)
  File "/opt/blazar/blazar/policy.py", line 112, in wrapped
    return func(self, *args, **kwargs)
  File "/opt/blazar/blazar/utils/trusts.py", line 93, in wrapped
    setattr(to_update, 'trust_id', trust.id)
  File "/opt/blazar/blazar/api/v1/oshosts/service.py", line 39, in create_computehost
    return self.manager_rpcapi.create_computehost(data)
  File "/opt/blazar/blazar/manager/oshosts/rpcapi.py", line 47, in create_computehost
    host_values=host_values)
  File "/opt/blazar/blazar/utils/service.py", line 44, in call
    return self._client.call(ctx.to_dict(), name, **kwargs)
  File "/opt/stein/lib/python3.6/site-packages/oslo_messaging/rpc/client.py", line 504, in call
    return self.prepare().call(ctxt, method, **kwargs)
  File "/opt/stein/lib/python3.6/site-packages/oslo_messaging/rpc/client.py", line 178, in call
    retry=self.retry)
  File "/opt/stein/lib/python3.6/site-packages/oslo_messaging/transport.py", line 128, in _send
    retry=retry)
  File "/opt/stein/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 645, in send
    call_monitor_timeout, retry=retry)
  File "/opt/stein/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 636, in _send
    raise result
oslo_messaging.rpc.client.RemoteError: Remote error: BadRequest Malformed request URL: URL's project_id '9427903ca1544f0795ba4117d55ed9b2' doesn't match Context's project_id '2f3e9e705b0b460b9de90d9844e88fd2' (HTTP 400) (Request-ID: req-ee174a23-7a4d-45ff-9847-2cbb740261ed)

[Pierre Riteau (priteau)]

I believe this may be solved by removing /%(tenant_id)s from Nova endpoints. See
https://opendev.org/openstack/kolla-ansible/commit/82551a2bfb62049cf7503fd2a543697ff7f4b7d4 for how this was changed in Kolla Ansible. If this is not an appropriate solution we would need to allow to provide a custom Nova endpoint URL via blazar.conf. I don't remember whether that's already possible or not.

[Sam Morrison (sorrison)]

I don't think that is the right approach. I've been having a look how this is done and want to refactor it a bit but haven't had time.

In the meantime https://github.com/NeCTAR-RC/blazar/commit/a92232ea2d4d53cb19f8b8251689ebb7ef8aff7c is a simple fix that does the job and gets us moving forward.