Re: Fwd: inconsistent behaviour with failover on 2 combo router-server nodes?

Hi Paul,

No, I'm not using conntrackd. However, I think I found the answer to my
question: it just took some connections longer to time out (a few mins), so
no inconsistencies.

Thanks again for reply.

Regards,
Alexander


On 22 January 2014 20:28, Paul Robert Marino <[email protected]> wrote:

> Are you using conntrackd?
>
>
> On Wed, Jan 22, 2014 at 3:09 PM, Alexander Ufimtsev <[email protected]> wrote:
> > Hello All,
> >
> > I'm running keepalived on two nodes that work both as routers and
> servers,
> > using lo:0 interface for virtual ip and iptables to mark packets for real
> > servers. Server 1 has priority over server 2 and thus control the virtual
> > ip. The workload consists of clients establishing a long-running tcp
> > connections to the servers.
> >
> > I've noticed an interesting behavour during failover: when server 1 fails
> > over, all existing tcp connections to server 1 are gone and clients
> > reconnect to server 2, which is 100% correct and expected behaviour.
> > However, when server 1 comes back and takes over virtual ip, some
> clients on
> > server 2 get disconnected and then have to dial back to server 1. This
> seems
> > to happen only for clients that connected to server 2 when server 1 was
> > offline. The clients that were connected to server 2 before server 1 went
> > down remain connected to server 2.
> >
> > Is this due to the fact that before server 2 takes over virtual ip on
> eth0,
> > clients bind to lo:0 and after virtual ip takeover they bind to virtual
> ip
> > on eth0? If so, is there any way to teach them to bind to lo:0 instead so
> > they do not disconnect the moment another server takes over the virtual
> ip?
> >
> > Many thanks,
> > Alexander
> >
> > --
> > Alexander Ufimtsev
> > School of Computer Science and Informatics
> > University College Dublin, Belfield, D4, Ireland
> > Phone: +353 1 716 2926  Fax: +353 1 269 7262
> >
> >
> >
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