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Has nova-network been restarted? There was an issue where nova-network was
signalling dnsmasq which would cause dnsmasq to stop responding to requests
yet appear to be running fine.

You can see if killing dnsmasq, restarting nova-network, and rebooting an
instance allows it to get a dhcp address again ...

Nate
On Jun 14, 2012 4:46 PM, "Christian Parpart" <trapni at gmail.com> wrote:

> Hey all,
>
> I feel really sad with saying this, now, that we have quite a few
> instances in producgtion
> since about 5 days at least, I now have encountered the second instance
> loosing its
> IP address due to "No DHCPOFFER" (as of syslog in the instance).
>
> I checked the logs in the central nova-network and gateway node and found
> dnsmasq still to reply on requests from all the other instances and it even
> got the request from the instance in question and even sent an OFFER, as
> of what
> I can tell by now (i'm investigating / posting logs asap), but while it
> seemed
> that the dnsmasq sends an offer, the instances says it didn't receive one
> - wtf?
>
> Please tell me what I can do to actually *fix* this issue, since this is
> by far very fatal.
>
> One chance I'd see (as a workaround) is, to let created instanced retrieve
> its IP via dhcp, but then reconfigure /etc/network/instances to continue
> with
> static networking setup. However, I'd just like the dhcp thingy to get
> fixed.
>
> I'm very open to any kind of helping comments, :)
>
> So long,
> Christian.
>
>
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