Commit https://github.com/openstack/neutron/commit/140029ebd006c116ee684890dd70e13b7fc478ec switch to using socket.gethostname() for the name of neutron agents; this has the unfortunate side effect with the l3-agent that all router services are no longer scheduled on an active agent, resulting in floating ip and access outages.
Looks like this will effect upgrades from grizzly->havana as well:
ubuntu@churel:/etc/maas$ quantum agent-list
+--------------------------------------+--------------------+--------------------------+-------+----------------+
| id | agent_type | host | alive | admin_state_up |
+--------------------------------------+--------------------+--------------------------+-------+----------------+
| 02ad1175-209c-4125-889a-e390a15ecd50 | Open vSwitch agent | caipora.1ss.qa.lexington | xxx | True |
| 191d4757-05f6-4170-a78d-d6a3c1b9265e | Open vSwitch agent | canaima | :-) | True |
| 306cbfbb-8879-4d64-ac26-db007f9113a9 | DHCP agent | cofgod.1ss.qa.lexington | xxx | True |
| 32081821-1e94-4274-993b-b0bf2714e5ac | Open vSwitch agent | ciguapa.1ss.qa.lexington | xxx | True |
| 5697a23a-712e-4de3-a218-2a6c177bf555 | Open vSwitch agent | chakora | :-) | True |
| 5ea5e207-1da0-47e3-9a7e-984589b11300 | Open vSwitch agent | cuegle.1ss.qa.lexington | xxx | True |
| 71e31354-76e7-4640-9a5b-368678bc22d0 | Open vSwitch agent | canaima.1ss.qa.lexington | xxx | True |
| 7267e3d2-d9bf-4e57-8d19-803aab636f36 | Open vSwitch agent | chakora.1ss.qa.lexington | xxx | True |
| 75ff2563-f5a5-4df3-aa19-fe8310146c10 | Open vSwitch agent | cuegle | :-) | True |
| 875de52e-d6c3-4e82-8cbd-269831ff00bc | Open vSwitch agent | cofgod | :-) | True |
| 9afaf6f2-2756-4863-b5d0-7faba502e878 | L3 agent | cofgod | :-) | True |
| a81ac370-a318-42e4-9279-eef2b6141644 | Open vSwitch agent | cofgod.1ss.qa.lexington | xxx | True |
| d6e6332e-822a-438e-8613-16013da825e0 | L3 agent | cofgod.1ss.qa.lexington | xxx | True |
| d9712755-03b3-4326-99c1-3bf66c878dc6 | Open vSwitch agent | ciguapa | :-) | True |
| dadf284c-ac8f-4dc1-9ba4-73182e5f1911 | DHCP agent | cofgod | :-) | True |
| ed07ff1a-dcca-4bbd-b026-1296bb90f89b | Open vSwitch agent | caipora | :-) | True |
+--------------------------------------+--------------------+--------------------------+-------+----------------+
@Mark
I note that this issue was included in the Havana release notes. Was there a plan to provide a helper for upgrader's to move services between renamed agents and tidy?