[squid-users] affinity session load balancing

Antony Stone Antony.Stone at squid.open.source.it
Mon Nov 16 10:49:29 UTC 2015

On Monday 16 November 2015 at 11:32:31, Patrick Chemla wrote:

> I am doing load balancing as sourcehash, so on IP source.
> The problem is that about 80% of clients come from the same IP, so I
> have a highly loaded backend, while other are sleeping.
> So whatever you call it, on haproxy they call it session affinity LB,
> my need is to use a round-robin load balancing, but, very important,
> each user should always directed to the same backend.

So, the question remains "how do you identify a session?" (or maybe you could 
rephrase it as "how do you identify a user?").

> Can we do that with squid? avoiding user login on squid (userhash is not
> convenient)?

You've already said that source IP is not a reliable indication of the user 
(and this is very often true anyway), so what additional information exists in 
the requests to identify a session / user?

Without knowing what application you're dealing with, we can't guess this for 



> On 16/11/2015 11:41, Antony Stone wrote:
> > On Monday 16 November 2015 at 10:35:39, Patrick Chemla wrote:
> >> Hi,
> >> 
> >> I am using squid for years, maybe with basic features, and I have a
> >> problem today with an app where I need to manage multiple backends, be
> >> sure that a user is always sent to the same one because the app writes
> >> on local disk, and I have 80% users coming from same IP.
> > 
> > Is this Squid operating in accelerator mode (in front of the server/s) or
> > in proxying mode (being used by the clients)?
> > 
> >> So I need to load balance, not on the soucre IP, and I can't have a
> >> login on squid to identify each user, because it will create a double
> >> connexion procedure with the application login.
> > 
> > How does the app distinguish between different clients *without* Squid
> > being involved?
> > 
> >> Is there a way that squid will recognize a new connexion, maybe same IP,
> >> and load balnace it to any backend using round-robin? some affinity
> >> session load balancing?
> > 
> > The first thing needed to answer that is a definition of "session".
> > 
> > 
> > Regards,
> > 
> > Antony.

Users don't know what they want until they see what they get.

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