Sticky Load Balancing with Varnish

[Niklas Norberg]

I was actually referring, see below, to 

http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html#busyness

but you probably figured that :)

--
Niklas

> > ons 2010-04-14 klockan 20:13 +0200 skrev Niklas Norberg:
> > ons 2010-04-14 klockan 16:00 +0000 skrev Poul-Henning Kamp:
> > In message <1271248091.5141.33.camel at app-srv-debian-amdmp2.idni>, Niklas Norber
> > g writes:
> > 
> > >So I also vote for keeping this as a documented configuration rather
> > >than a built-in feature. Unless the planned sticky load balancing will
> > >have something above the rudimentary.
> > 
> > Check the "hash" and "client" directors in 2.1, depending on what
> > you want to be "sticky" based on (object or client)
> > 
> 
> Thanks (but...),
> 
> Does the hash director balance differently, in the big picture, than the
> already existing random director?
> 
> The client director comes close to my intended setup but the problem
> with balancing on client ip is, as have been mentioned before, that lots
> of clients (real users behind their browsers) can share the same
> ip-adress. I worked with a site where the end users were schools and
> 8.30 the traffic always got high and the ip-adresses were too few to
> balance on, so we did it in the hardware load balancer on level 7 (i.e.
> with a cookie).
> 
> As I see it there are only two cases:
> * Either we want to have sticky (ip or cookie) for the traffic that has
> uses session cookies, because in this case it is costful to hit the
> wrong backend (session redundancy costs performance (and setup hours).
> or
> * It's stateless traffic and therefor it can be distributed randomly. In
> this case preferably with weights (if the backends differ) and with
> traffic memory according to:
> http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html#traffic
> 
> It is of course good if they can be combined as one for example easily
> can do with VCL in Varnish.
> 
> As I can figure these two covers all, or?
> 
> So the question is, are there any plans for any traffic based
> director? :)
> 
> 
> Best Regards
> 
> Niklas Norberg
> 
>