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The best way would be to use a jump table.<br>
By that, I mean to make multiple subroutines in C, and then to jump
to the different subroutines by looking<br>
up pointers to the subroutines using a string hashing/lookup system.<br>
<br>
You would also need a flag to indicate whether the hash has been
'initialized' yet as well.<br>
The initialization would consist of storing function pointers at the
hash locations corresponding to each<br>
of the domains.<br>
<br>
I attempted to do this myself when I first started using varnish,
but I was having problems with varnish<br>
crashing when attempting to use the code I wrote in C. There may be
limitations to the C code that can be<br>
used.<br>
<br>
On 3/6/2011 5:39 PM, AD wrote:
<blockquote
cite="mid:AANLkTin5rEznSUyEz03=wat-zyhA1dFaUw4oU7Yn0Ox0@mail.gmail.com"
type="cite">Hello,
<div> </div>
<div> what is the best way to run an instance of varnish that may
need different vcl configurations for each hostname. This could
end up being 100-500 includes to map to each hostname and then a
long if/then block based on the hostname. Is there a more
scalable way to deal with this? We have been toying with
running one large varnish instance with tons of includes or
possibly running multiple instances of varnish (with the config
broken up) or spreading the load across different clusters (kind
of like sharding) based on hostname to keep the configuration
simple.</div>
<div><br>
</div>
<div> Any best practices here? Are there any notes on the
performance impact of the size of the VCL or the amount of
if/then statements in vcl_recv to process a unique call function
?</div>
<div><br>
</div>
<div>
Thanks</div>
<div><br>
</div>
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