[Openstack] DHCP problem in grizzly

Chu Duc Minh chu.ducminh at gmail.com
Fri Aug 2 09:27:21 UTC 2013

Hi, i have the same problem when create -> terminate -> create instances.
This problem only occur when the new instances have the same IP as deleted

I check the dnsmasq's host file
sometimes it's not update.

I think this problem maybe not only related to Dnsmasq, it may related to
firewall rules (generated by Quantum) on compute-node too. Because i see
some dropped DHCP packet:
Aug  2 14:08:11 thor-compute-03 kernel: [95971.005423] IN=qbr23c67719-14
OUT=qbr23c67719-14 PHYSIN=qvb23c67719-14 PHYSOUT=tap23c67719-
14 MAC=ff:ff:ff:ff:ff:ff:fa:16:3e:34:72:05:08:00 SRC=
DST= LEN=328 TOS=0x10 PREC=0x00 TTL=128 ID=0 *PROTO=UDP
SPT=68 DPT=67* LEN=308
(DHCP Discovery packet?)
It dropped in chain quantum-openvswi-sg-fallback, then instance can't get
IP. Although in Dashboard i see instance got IP.

I tried many times, and got a strange case: duplicate IP in Dnsmasq's host

My newest instance is **, and I can't ping it. In boot log of this
instance, i found:

cloudinitnonet waiting 120 seconds for a network device.
cloudinitnonet gave up waiting for a network device.
ciinfo: lo    : 1       .
ciinfo: eth0  : 1 .               .               fa:16:3e:c7:ea:0c
route_info failed

Restart instance didn't make it work, but restart quantum-dhcp-agent on
Quantum-node make it work.
After restart, content of Dnsmasq's host file is:

I think it a serious problem, hope someone could fix it soon.. :)

Best Regards,

On Tue, Jul 2, 2013 at 8:01 PM, James Page <james.page at ubuntu.com> wrote:

> On 20/05/13 07:51, Heinonen, Johanna (NSN - FI/Espoo) wrote:
>> Hi,
>> I have installed grizzly with quantum and ovs-plugin. It seems that
>> grizzly allocates the third address of each subnet for dhcp. (In folsom
>> it was the second address). This means that the VMs will get addresses
> This sound alot like https://bugs.launchpad.net/**
> ubuntu/+source/quantum/+bug/**1189909<https://bugs.launchpad.net/ubuntu/+source/quantum/+bug/1189909>;
> I'll raise a task for dnsmasq as well.
> Cheers
> James
> --
> James Page
> Ubuntu Core Developer
> Debian Maintainer
> james.page at ubuntu.com
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