Hi Folks,
In multi-host mode the "host" field of a network never seems to get set (as
only IPs are allocated, not networks)
However the periodic revovery task in NetworkManager uses the host field to
filter what addresses it should consider cleaning up (to catch the case where
the message from dnsmasq is either never sent or not delivered for some reason)
if self.timeout_fixed_ips:
now = utils.utcnow()
timeout = FLAGS.fixed_ip_disassociate_timeout
time = now - datetime.timedelta(seconds=timeout)
num = self.db.fixed_ip_disassociate_all_by_timeout(context,
self.host,
time)
if num:
LOG.debug(_('Dissassociated %s stale fixed ip(s)'), num)
Where "db.fixed_ip_disassociate_all_by_timeout" is:
def fixed_ip_disassociate_all_by_timeout(_context, host, time):
session = get_session()
inner_q = session.query(models.Network.id).\
filter_by(host=host).\
subquery()
result = session.query(models.FixedIp).\
filter(models.FixedIp.network_id.in_(inner_q)).\
filter(models.FixedIp.updated_at < time).\
filter(models.FixedIp.instance_id != None).\
filter_by(allocated=False).\
update({'instance_id': None,
'leased': False,
'updated_at': utils.utcnow()},
synchronize_session='fetch')
return result
So what this seems to do to me is:
- Find all of the fixed_ips which are:
o on networks assigned to this host
o Were last updated more that "Timeout" seconds ago
o Are associated to an instance
o Are not allocated
Because in multi-host mode the network host field is always Null, this query
does nothing apart from give the DB a good work out every 10 seconds - so there
could be a slow leakage of IP addresses.
Has anyone else spotted this - and if so do you have a good strategy for
dealing with it ?
It seems that running this on every network_manager every 10 seconds is
excessive - so what still running on all netwok_managers but using a long
random sleep between runs in mult-host mode ?
Thoughts ?
Cheers,
Phil
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