Re: Question about Source IP Pesistence With Backup

From: Willy Tarreau <>
Date: Sat, 18 Sep 2010 09:48:06 +0200

Hi John,

On Fri, Sep 17, 2010 at 12:51:15PM +0100, John Carter wrote:
> Hi,
> I have found that if I use Source IP persistence with both backend servers
> and a backup server. If the backend servers go down then I will be directed
> to the backup server, as it should be.
> However, my persistence is now change to be on the backup server and if the
> backend come back online, my persistence with the backup is maintained.

yes indeed that's how it works.

> <config>

> Is there anyway of keeping the backup server from being persistent - when
> using source IP persistence ?

No, right now there is no such solution. While I understand why it is not desirable in your case, in most cases you generally don't want visitors to lose persistence when going to a backup server. We would probably need to add a per-server option to disable persistence.

One thing that is planned for version 1.6 is the principle of "buddy servers". The idea is that we would be able to associate servers together, and that all traffic would be targetted to one server, but if it fails, a predetermined one would get the traffic without changing cookies nor persistence. That way, when the first one comes back up, the traffic can switch back to it.

I think that either method would cover your needs, though the first one should be "relatively" easy to implement. Are you interested in trying to do it yourself (even with some assistance if needed) ?

Willy Received on 2010/09/18 09:48

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