Something like this:
director cr-backends round-robin {
.retries = 5;
{
.backend...
}
# Repeat the above entry for each web server.
}
director cr-varnish round-robin {
.retries = 4;
{
.backend...
}
# Repeat the above entry for each varnish server.
}
sub vcl_recv {
set req.backend = cr-varnish;
if (req.http.X-Via-Varnish || req.restarts > 3) {
# Request is coming from the other server.
# Ignore busy objects to avoid race condition.
set req.hash_ignore_busy = 1;
set req.backend = cr-backends;
} else {
set req.http.X-Via-Varnish = "true";
}
}
Thanks, Ben
On 10 Feb 2011, at 14:14, Martin Boer wrote:
> I would also add weights so that each varnish prefers to ask its sibling
> say 250 times more often than asking the app-server.
> This will ensure that both varnishes will be as filled and as equal as
> possible.
> I don't know if 250 could be replaced by a larger number but this works
> for me.
>
> Regards,
> Martin
>
> On 02/10/2011 02:46 PM, Laurence Rowe wrote:
>> On 8 February 2011 23:05, Ben Dodd<[email protected]> wrote:
>>> Given this functionality, does anyone know what the VCL is required to
>>> implement this dual server Varnish setup scenario?
>>> http://varnish-cache.org/trac/wiki/VCLExampleHashIgnoreBusy
>> Something like this should work:
>>
>>
>> backend appserver { ... }
>> backend other_varnish { ... }
>>
>> # Server 1
>> sub vcl_recv {
>> set req.backend = other_varnish;
>> if (req.http.X-Via-Varnish || !req.backend.healthy) {
>> # Request is coming from the other server.
>> # Ignore busy objects to avoid race condition.
>> set req.hash_ignore_busy = 1;
>> set req.backend = appserver;
>> } else {
>> set req.http.X-Via-Varnish = "true";
>> }
>> }
>>
>> # Server 2
>> sub vcl_recv {
>> set req.backend = other_varnish;
>> if (req.http.X-Via-Varnish || !req.backend.healthy) {
>> # Request is coming from the other server.
>> set req.backend = appserver;
>> } else {
>> set req.http.X-Via-Varnish = "true";
>> }
>> }
>>
>> Laurence
>>
>> _______________________________________________
>> varnish-misc mailing list
>> [email protected]
>> http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>>
>>
>
>
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