Short background
===============
At Kuryr-kubernetes we use neutron-lbaasV2 with octavia as provider to backend some of kubernetes resources.
We do plan to move to octavia client instead of neutron-lbaasV2 , but not in the near future.

Problem description
===================
I'm trying to deploy devstack with the following local.conf

https://github.com/openstack/kuryr-kubernetes/blob/master/devstack/local.conf.sample

lbassV2+octavia and kuryr-kubernetes plugin.

At “stack” , “extra” phase ("$1" == "stack" && "$2" == "extra") of devstack we starts the kuryr-kubernetes service,
https://github.com/openstack/kuryr-kubernetes/blob/master/devstack/plugin.sh#L698

We have new requirement, that as a result of that ,we should create loadbalancer at the initialization  time of this service.


Actual results
===============
When  creating the LB I got  an exception saying that octavia service in unavailable :
"
neutronclient.v2_0.client [-] Error message: {"NeutronError": {"message": "Unknown Octavia error.", "type": "ServiceUnavailableException " "

I tried to add timeout  before starting our service,but still got the same exception.

I tried also moving the kuryr-kubernetes plugin (it seems plugins order in local.conf affect components activation order order in devstack)  ,
https://github.com/openstack/kuryr-kubernetes/blob/master/devstack/local.conf.sample#L3
, to be after octavia  component in local.conf.


It helped partially, didn’t get the exception above , but lb creation failed with provision status = ERROR.
digging into it , seems that the cause was the following exception at octavia-worker:

"
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Atom 'STANDALONE-octavia-create-amp-for-lb-subflow-octavia-generate-serverpem' {'intention': 'EXECUTE', 'state': 'SUCCESS'}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Atom 'STANDALONE-octavia-create-amp-for-lb-subflow-octavia-create-amphora-indb' {'intention': 'EXECUTE', 'state': 'SUCCESS', 'requires': {}, 'provides': u'36129a7c-6bc5-41b0-9825-431e8c76b78a'}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Flow 'STANDALONE-octavia-create-amp-for-lb-subflow'
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Atom 'STANDALONE-octavia-get-amphora-for-lb-subflow-octavia-mapload-balancer-to-amphora' {'intention': 'EXECUTE', 'state': 'SUCCESS', 'requires': {'loadbalancer_id': u'99409d16-a0ff-4ade-bb8c-bcf6e168f7b9'}, 'provides': None}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Flow 'STANDALONE-octavia-get-amphora-for-lb-subflow'
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Atom 'octavia.controller.worker.tasks.lifecycle_tasks.LoadBalancerIDToErrorOnRevertTask' {'intention': 'EXECUTE', 'state': 'SUCCESS', 'requires': {'loadbalancer_id': u'99409d16-a0ff-4ade-bb8c-bcf6e168f7b9'}, 'provides': None}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: |__Flow 'octavia-create-loadbalancer-flow': ComputeBuildException: Failed to build compute instance due to: {u'message': u"Host 'cvcfgfg' is not mapped to any cell", u'code': 400, u'created': u'2018-01-23T11:43:14Z'}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker Traceback (most recent call last):
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker   File "/usr/lib/python2.7/site-packages/taskflow/engines/action_engine/executor.py", line 53, in _execute_task
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker     result = task.execute(**arguments)
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker   File "/opt/stack/octavia/octavia/controller/worker/tasks/compute_tasks.py", line 195, in execute
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker     raise exceptions.ComputeBuildException(fault=fault)
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker ComputeBuildException: Failed to build compute instance due to: {u'message': u"Host 'cvcfgfg' is not mapped to any cell", u'code': 400, u'created': u'2018-01-23T11:43:14Z'}
Jan 23 11:43:16 cvcfgfg octavia-worker[23573]: ERROR octavia.controller.worker.controller_worker
"

My questions
============
Is there any API that I can query for Lbaas/octavia readiness ?
Do you have any idea how to tackle above use case ?