Comment 0 for bug 1646255

trying to remove compute node properly

Steps to reproduce
==================
1) remove all instances from the hypervisor:
(env) vance@zs95k5:~$ nova hypervisor-servers zs93k23
+----+------+---------------+---------------------+
| ID | Name | Hypervisor ID | Hypervisor Hostname |
+----+------+---------------+---------------------+
+----+------+---------------+---------------------+

2) disable the hypervisor:
(env) vance@zs95k5:~$ nova service-list
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+
| Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason |
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+
| 3 | nova-cert | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:13:34.000000 | - |
| 4 | nova-scheduler | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:13:27.000000 | - |
| 5 | nova-conductor | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:13:30.000000 | - |
| 14 | nova-compute | u27-maas-machine-1 | nova | disabled | up | 2016-11-30T21:13:28.000000 | - |
| 16 | nova-compute | zs95k181 | nova | enabled | up | 2016-11-30T21:13:33.000000 | - |
| 17 | nova-compute | zs93k23 | nova | enabled | up | 2016-11-30T21:13:33.000000 | - |
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+
(env) vance@zs95k5:~$ nova service-disable zs93k23 nova-compute
+---------+--------------+----------+
| Host | Binary | Status |
+---------+--------------+----------+
| zs93k23 | nova-compute | disabled |
+---------+--------------+----------+

3) delete the compute service
(env) vance@zs95k5:~$ nova service-delete 17
(env) vance@zs95k5:~$ nova service-list
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+
| Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason |
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+
| 3 | nova-cert | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:14:54.000000 | - |
| 4 | nova-scheduler | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:14:47.000000 | - |
| 5 | nova-conductor | juju-605709-2-lxd-3 | internal | enabled | up | 2016-11-30T21:14:56.000000 | - |
| 14 | nova-compute | u27-maas-machine-1 | nova | disabled | up | 2016-11-30T21:14:48.000000 | - |
| 16 | nova-compute | zs95k181 | nova | enabled | up | 2016-11-30T21:14:53.000000 | - |
+----+----------------+---------------------+----------+----------+-------+----------------------------+-----------------+

4) delete the neutron agent
(env) vance@zs95k5:~$ openstack network agent list
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+
| 039e4b7a-3dbe-4e87-a9a5-d4b569d3113d | Open vSwitch agent | u27-maas-machine-2 | None | True | UP | neutron-openvswitch-agent |
| 2aa13570-0e62-4198-96d9-dfe732d7874d | DHCP agent | u27-maas-machine-2 | nova | True | UP | neutron-dhcp-agent |
| 2ab2320a-69cb-4a7f-8ae4-541d3b2bdd3b | L3 agent | u27-maas-machine-2 | nova | True | UP | neutron-l3-agent |
| 48d6d83b-e459-46c8-945c-eea4197c01ec | Open vSwitch agent | zs95k181 | None | True | UP | neutron-openvswitch-agent |
| a36eecd5-1fb4-436a-becd-fccc737518fd | Metering agent | u27-maas-machine-2 | None | True | UP | neutron-metering-agent |
| aaee3bf0-f8bd-41b7-94ed-f9213f120016 | Open vSwitch agent | zs93k23 | None | True | UP | neutron-openvswitch-agent |
| c6039c81-ad20-4258-a926-bc4a90dccc96 | Loadbalancer agent | u27-maas-machine-2 | None | True | UP | neutron-lbaas-agent |
| cfecc66c-2888-4c3d-8241-1d3fcd018a1f | Metadata agent | u27-maas-machine-2 | None | True | UP | neutron-metadata-agent |
| f60cbf28-f030-43ae-a598-0d0182529804 | Open vSwitch agent | u27-maas-machine-1 | None | True | UP | neutron-openvswitch-agent |
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+
(env) vance@zs95k5:~$ openstack network agent delete aaee3bf0-f8bd-41b7-94ed-f9213f120016
(env) vance@zs95k5:~$ openstack network agent list
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+
| 039e4b7a-3dbe-4e87-a9a5-d4b569d3113d | Open vSwitch agent | u27-maas-machine-2 | None | True | UP | neutron-openvswitch-agent |
| 2aa13570-0e62-4198-96d9-dfe732d7874d | DHCP agent | u27-maas-machine-2 | nova | True | UP | neutron-dhcp-agent |
| 2ab2320a-69cb-4a7f-8ae4-541d3b2bdd3b | L3 agent | u27-maas-machine-2 | nova | True | UP | neutron-l3-agent |
| 48d6d83b-e459-46c8-945c-eea4197c01ec | Open vSwitch agent | zs95k181 | None | True | UP | neutron-openvswitch-agent |
| a36eecd5-1fb4-436a-becd-fccc737518fd | Metering agent | u27-maas-machine-2 | None | True | UP | neutron-metering-agent |
| c6039c81-ad20-4258-a926-bc4a90dccc96 | Loadbalancer agent | u27-maas-machine-2 | None | True | UP | neutron-lbaas-agent |
| cfecc66c-2888-4c3d-8241-1d3fcd018a1f | Metadata agent | u27-maas-machine-2 | None | True | UP | neutron-metadata-agent |
| f60cbf28-f030-43ae-a598-0d0182529804 | Open vSwitch agent | u27-maas-machine-1 | None | True | UP | neutron-openvswitch-agent |
+--------------------------------------+--------------------+--------------------+-------------------+-------+-------+---------------------------+

5) check hypervisor list
(env) vance@zs95k5:~$ nova hypervisor-list
ERROR (ClientException): Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'nova.exception.ComputeHostNotFound'> (HTTP 500) (Request-ID: req-2b773323-be4f-4c8c-be05-a41144ebed76)

Okay, here is the error from the log:
http://paste.ubuntu.com/23559892/

Expected result
===============
Nova compute node is properly removed from the OS database.

Environment
===========
1. OpenStack nova version 2:13.1.2-0ubuntu2

2. Hypervisor:
   Libvirt+KVM (KVM for IBM z Systems 1.1.3-beta4.3)

3. Networking type: OVS+GRE