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List: varnish-misc
Subject: Varnish as load balancer
From: varnish () held-im-ruhestand ! de (Christoph Handel)
Date: 2009-05-18 9:33:31
Message-ID: 20090518093330.GA10178 () cha-desktop
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On Mon, May 18, 2009 at 11:13:24AM +0200, Tollef Fog Heen wrote:
> ]] "Carlos Oliva G."
>
> | In the current setup I'm skipping Lighttpd altogether and began using
> | Varnish as a load balancer altogether as well, with the 'directors'
> | feature. However I'm still missing the last bit of the requested
> | functionality that is to evenly balance all the requests from
> | 'anonymous' users that aren't registered/logged into the system (which
> | I am already identifying in the sub_rcvd function of my VCL), but for
> | registered users to preserve their session by redirecting them always
> | to the same backend server. I know I can create a 'hash' using some
> | relatively unique values, as the originating IP address + the User
> | Agent and a session-dependent cookie value, but what I don't know is
> | (if possible), how to use this hash to determinate to what backend
> | server to direct the request to.
>
> We currently don't have a hashing load balancer (which is what you seem
> to want). (Patches accepted, or Redpill Linpro can get you a quote on
> how much work it is to develop it.)
>
> What you could do is have the backend set a cookie with its name when
> the user logs in, and then choose backend depending on cookie value.
>
> Another alternative is to use nginx or similar as Varnish' backend and
> let that do the hashing and load balancing. I have been told it's quite
> good, but I don't have experience with it myself.
you could take a look at haproxy (http://haproxy.1wt.eu/)
copes with pretty high loads and allows you to inject cookies for
sticky sessions.
Greetings
Christoph
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