VIP switch causing connections that refuse to die

Michal Arbet michal.arbet at ultimum.io
Mon Mar 1 10:03:13 UTC 2021


Hi,

I really like the tool, thank you. also confirms my idea as this kernel
option is also used by other projects where they explicitly mention case
with keepalived/VIP switch.

Now I definitively think this  should be handled also in kolla-ansible.

Thanks,
Michal Arbet ( kevko )

Dne po 1. 3. 2021 9:53 uĹživatel Mark Goddard <mark at stackhpc.com> napsal:

> On Fri, 26 Feb 2021 at 17:08, Michal Arbet <michal.arbet at ultimum.io>
> wrote:
> >
> > Hi,
> >
> > I found  that keepalived VIP switch cause TCP connections  that refuse
> to die on host where VIP was before  it was switched.
> >
> > I filled a bug here ->
> https://bugs.launchpad.net/kolla-ansible/+bug/1917068
> > Fixed here ->
> https://review.opendev.org/c/openstack/kolla-ansible/+/777772
> > Video presentation of bug here ->
> https://download.kevko.ultimum.cloud/video_debug.mp4
> >
> > I was just curious and wanted to ask here in openstack-discuss :
> >
> > If someone already seen this issue in past ?
> > If yes, do you tweak net.ipv4.tcp_retries2 kernel parameter ?
> > If no, how did you solve this ?
>
> Hi Michal, thanks for the investigation here. There is a nice tool,
> that I found far too late, that helps to help answer questions like
> this: https://codesearch.opendev.org/
>
> >
> > Thank you,
> > Michal Arbet ( kevko )
> >
>
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