[neutron]Some floating IPs inaccessible after restart of L3 agent

Michal Arbet michal.arbet at ultimum.io
Mon Nov 29 10:47:47 UTC 2021

I am glad that it works for you now :)


Michal Arbet
Openstack Engineer

Ultimum Technologies a.s.
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po 29. 11. 2021 v 10:35 odesílatel Kamil Madáč <kamil.madac at slovenskoit.sk>

> Ahoj Michal,
> Thanks for responding and suggestion. During the weekend I upgraded
> neutron l3 agent to most recent victoria version of kolla container
> (17.2.2.dev56) and it seems it helped -> No disappearing routes in fip
> namespace anymore after restart 🙂
> I found change set which fixes race condition in l3 agent
> https://review.opendev.org/c/openstack/neutron/+/803576 from September
> this year and I think that could be the one which fixes it.
> ------------------------------
> *From:* Michal Arbet <michal.arbet at ultimum.io>
> *Sent:* Monday, November 29, 2021 10:20 AM
> *To:* Kamil Madáč <kamil.madac at slovenskoit.sk>
> *Cc:* openstack-discuss <openstack-discuss at lists.openstack.org>
> *Subject:* Re: [neutron]Some floating IPs inaccessible after restart of
> L3 agent
> Ahoj Kamil,
> I've just read email on phone quickly, and I remember that I've fixed
> something similar in Debian Victoria packages. Maybe it's your issue, but
> can't check right now.
> Could you check it ? It's fixed in newer versions of neutron.
> https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/1927868
> Thanks,
> Michal Arbet (kevko)
> Dňa pi 26. 11. 2021, 10:53 Kamil Madáč <kamil.madac at slovenskoit.sk>
> napísal(a):
> Hello Everyone,
> We have openstack Victoria deployed since the beginning of the year with
> kolla/ansible in docker containers. Everything was running OK, but few
> weeks ago we noticed issues with networking. Our installation uses
> Openvswitch networking with DVR non HA routers.
> Everything is running smoothly until we restart L3 agent. After that, some
> floating ips of VMs running on the node where L3 agent is running becomes
> inaccessible. Workaround is to reassign floating IP to affected VM. Every
> restart affects same floating IPs and VMs.
> No errors/excpetions found in logs.
> I was able to find out that after restart there are missing routes for
> those particular floating IPs in fip- namespace, which causes that proxy
> arp responses are not working. After floating IP address is reassigned,
> routes are added by L3 agent and floating IP is working again.
> Looks like some sort of race condition in L3 agent, but I was not able to
> identify any possible existing bug.
> L3 agent is in version 17.0.1.dev44.
> Is anyone aware of any existing bug which could explain such behavior, or
> does anyone have idea how to solve the issue?
> Kamil Madáč
> *Slovensko IT a.s.*
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