[sr-dev] Kamailio websocket state FINWAIT1 after switchover

[Shahid Hussain]

Hi  Henning,
I missed your reply as it went to another folder!.
Yes, I am restarting an active node and it is not closing the websocket tcp
connection but the state of connection is FINWAIT.  Capture shows neither
at active node nor end point received any FIN packet.
The reason we suspect that switchover is moving VIP to the current passive
node so fast  that the  active node is unable to complete tcp close
activity. We have implemented ping pong from the client to detect network
failure as a resolution.

Thanks.

On Fri, Jun 18, 2021 at 2:54 PM Henning Westerholt <hw at skalatan.de> wrote:

> Hello,
>
>
>
> just to understand it correctly: You are restarting the Kamailio on the
> active node, and it does not close the existing Websocket TCP connections?
> Or you are restarting the Kamailio on the second passive node?
>
>
>
> Cheers,
>
>
>
> Henning
>
>
>
>
>
>
>
> *From:* sr-dev <sr-dev-bounces at lists.kamailio.org> *On Behalf Of *Shahid
> Hussain
> *Sent:* Thursday, June 17, 2021 1:54 PM
> *To:* sr-dev at lists.kamailio.org
> *Subject:* [sr-dev] Kamailio websocket state FINWAIT1 after switchover
>
>
>
> Hi !.,
>
> Kamailio websocket state is going into FINWAIT1 without sending FIN
> message out when we do service kamailio restart.
>
> I have a Primary and Secondary node configured. When I perform switchover
> socket status is going into FINWAIT1 state without sending FIN to the
> client hence client  status is showing established, This is happening 90+%
> of times but does work sometimes.
>
>
>
> AT Kamailio:
>
> [root at localhost ~]# netstat -tunelap | grep 41034
>
> tcp        0      1 172.27.45.198:9040      172.27.6.98:41034
> FIN_WAIT1   0          0          -
>
> [root at localhost ~]#
>
>
>
> AT Nginx (client):
>
> root at meet:~# netstat -tunelap | grep 9040
>
> tcp        0      0 172.27.6.98:41034       172.27.45.198:9040
> ESTABLISHED 33         763106     1322/nginx: worker
>
> root at meet:~#
>
>
>
> Thanks,
>
> Shahid
>
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