[openstack-dev] [Neutron] Regarding neutron bug # 1432582

Sudipto Biswas sbiswas7 at linux.vnet.ibm.com
Wed Apr 8 17:46:47 UTC 2015

Hi Guys, I'd really appreciate your feedback on this.


On Monday 30 March 2015 12:11 PM, Sudipto Biswas wrote:
> Someone from my team had installed the OS on baremetal with a wrong 
> 'date'
> When this node was added to the Openstack controller, the logs from the
> neutron-agent on the compute node showed - "AMQP connected". But the 
> neutron
> agent-list command would not list this agent at all.
> I could figure out the problem when the neutron-server debug logs were 
> enabled
> and it vaguely pointed at the rejection of AMQP connections due to a 
> timestamp
> miss match. The neutron-server was treating these requests as stale 
> due to the
> timestamp of the node being behind the neutron-server. However, 
> there's no
> good way to detect this if the agent runs on a node which is ahead of 
> time.
> I recently raised a bug here: 
> https://bugs.launchpad.net/neutron/+bug/1432582
> And tried to resolve this with the review:
> https://review.openstack.org/#/c/165539/
> It went through quite a few +2s after 15 odd patch sets but we still 
> are not
> in common ground w.r.t addressing this situation.
> My fix tries to log better and throw up an exception to the neutron 
> agent on
> FIRST time boot of the agent for better detection of the problem.
> I would like to get your thoughts on this fix. Whether this seems 
> legit to have
> the fix per the patch OR could you suggest a approach to tackle this 
> OR suggest
> just abandoning the change.
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