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> Do you see something like the following every sixty seconds in your network.log?
> 
> 2012-06-26 17:52:38 DEBUG nova.manager [-] Running periodic task FlatDHCPManager._disassociate_stale_fixed_ips from (pid=20993) periodic_tasks /opt/stack/nova/nova/manager.py:164

I do see these messages in the log (approximately once/minute, it looks like).

Here's a test:

- I boot and then deleted ('nova delete ...') an instance.  This
  leaves the database looking like this:

mysql> select created_at,updated_at,allocated,instance_id
        from fixed_ips where allocated=0 and instance_id is not null;
+---------------------+---------------------+-----------+-------------+
| created_at          | updated_at          | allocated | instance_id |
+---------------------+---------------------+-----------+-------------+
| 2012-06-21 20:26:45 | 2012-06-26 18:56:32 |         0 |        2247 |
+---------------------+---------------------+-----------+-------------+
1 row in set (0.00 sec)

- I wait a while...

mysql> select utc_time();
+------------+
| utc_time() |
+------------+
| 19:08:24   |
+------------+
1 row in set (0.00 sec)

- But the ip still has an instance_id:

mysql> select created_at,updated_at,allocated,instance_id
        from fixed_ips where allocated=0 and instance_id is not null;
+---------------------+---------------------+-----------+-------------+
| created_at          | updated_at          | allocated | instance_id |
+---------------------+---------------------+-----------+-------------+
| 2012-06-21 20:26:45 | 2012-06-26 18:56:32 |         0 |        2247 |
+---------------------+---------------------+-----------+-------------+
1 row in set (0.00 sec)

> fixed_ip_disassociate_timeout defaults to 600 so ips should be reclaimed
> after 10 minutes unless you have changed the value of that option.

That option appears to be set to the default of 600 seconds.

-- 
Lars Kellogg-Stedman <lars at seas.harvard.edu>       |
Senior Technologist                                | http://ac.seas.harvard.edu/
Academic Computing                                 | http://code.seas.harvard.edu/
Harvard School of Engineering and Applied Sciences |