----- jean-marc pouchoulon <[EMAIL PROTECTED]> wrote:
> Hello all ,
> We are using zope/nuxeo cps with 8 zeo clients and I test varnish 1.3
> in place of squid 2.6.
> squid uses 8 zeo peers and if I've understood well varnish can have
> "only one" host per backend.
> is there is a way to load balance upon multiples hosts with varnish ?
There are multiple ways to achieve this, but nothing is built into varnish (yet
atleast). But there are multiple solutions out there you could utilize, either
proprietary appliances or software (Alteon/Radware/Cisco/Zeus XTM) or open
source solutions. I would guess the latter is most interesting for you, and I
have heard good things about perlbal [1]. It is used by a number of high
profile, high load sites.
We are currently running a setup where the pool is divided like this:
Alteon LB
/ \
VarnishServer1 VarnishServer2
| |
Apache2+mod_php1 Apache2+mod_php2
This caters to multiple failure situations; whenever Apache1 goes down
Varnish2+Apache2 will serve the load and vice versa. If Varnish1 or Varnish2
goes down, the Alteon will direct traffic straight at the relevant backend
(through a backup server config setting), but with a lot less weight than the
remaining VarnishServer.
Ideally we would like to build an even more efficient setup, but there are
certain limitations of the LB Switch OS we are currently running that prevent
this as of now.
The setup I described above is probably not suited to your application though,
this was more of an elaboration on one way to setup loadbalancing with Varnish.
[1] http://www.danga.com/perlbal/
--
Denis Braekhus - Teknisk Ansvarlig ABC Startsiden AS
http://www.startsiden.no
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