[Openstack] [Quantum] dhcp-agent stops updating dnsmasq

Jonathan Proulx jon at jonproulx.com
Mon Sep 9 15:07:13 UTC 2013

Hi All,

I'm running Grizzly on Ubuntu 12.04 and using quantum ovs.

Periodically it seems the quantum-dhcp-agent stops informing dnsmasq when
new ports are created.

looking at the instance info from nova or the related port information in
quantum the MAC address to IP mapping shows up correctly.

The dnsmasq 'host' file has no record of either and while dnsmasq logs show
requests from the MAC(s) in question it also logs "no ip available"

Existing registrations renew properly  and the quantum-dhcp-agent continues
to run with nothing logged.  Restarting quantum-dhcp-agentget things back
to normal, but this is happening multiple times a day and my only current
means of detection is user complaints.

currently there are 365 active ports on the default network with a
lease_time of 30min (default is 2min). There are a few project networks
with a small number of active ports, it is unclear if these have the same
issues do to small sample size.

I'm thinking of pushing the leas_time further out maybe to a few hours, but
it's unclear to me if that would help.

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