This should help.
http://varnish.projects.linpro.no/wiki/Backends
Right now there are two load balancing methods: round robin and
weighted round robin.
backend_round_robin rr {
set backend.set = {
{ "foo1.bar.com", "http" }
{ "foo2.bar.com", "http" }
{ "foo3.bar.com", "http" }
};
}
backend_random rrr {
set backend.set = {
{ "foo1.bar.com", "http", 0.3 }
{ "foo2.bar.com", "http", 0.6 }
{ "foo3.bar.com", "http", 0.1 }
};
}
Once you have that in your VCL, just select which backend to use like
you normally would:
sub vcl_recv {
if {req.http.host ~ "foo"} {
req.backend = rr;
} elseif {req.http.host ~ "bar"} {
req.backend = rr;
} else {
req.backend = rrr;
}
}
BTW, the regular round robin works pretty good for us.
On 12/4/07, Dave Cheney <[EMAIL PROTECTED]> wrote:
> Hi,
>
> We use a pair of varnish servers behind a load balancer provided by
> our hosting center. For various technical reasons the load balancer
> can't be used to balance the servers that varnish sits in front of so
> I would like to use the balanced backend functionality (introduced
> somewhere around changeset 1940). I've been looking in the source for /
> trunk and brances/1.2 but I can't find any documentation for
> constructing a VLC script for balanced backends. Can anyone give any
> sample configuration ?
>
> Cheers
>
> Dave
> _______________________________________________
> varnish-dev mailing list
> varnish-dev@projects.linpro.no
> http://projects.linpro.no/mailman/listinfo/varnish-dev
>
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