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

Édouard Thuleau thuleau at gmail.com
Mon Sep 9 20:27:46 UTC 2013

Hi Jon,

Effectively, a bug [1] was identified. When DHCP agent is down because its
overloaded, Neutron agent will not send update to that agent and doesn't
raise the problem.
I submitted small patch to a warning log but I abandoned it to propose
another one (not yet finish) which will raise an exception and destroy the
created port.

[1] https://bugs.launchpad.net/neutron/+bug/1185916


On Mon, Sep 9, 2013 at 5:07 PM, Jonathan Proulx <jon at jonproulx.com> wrote:

> 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.
> -Jon
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