Guillaume Quintard

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PSA: You don't need that many regexes

HTTP is an intrinsically textual protocol, with relatively few rules. So it makes sense for Varnish to provide you with one of the best tools available to manipulate text: the regular expression, or "regex" (or "regexp", or "regexp?" if you want to be very clever).

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22/08/18 13:30
by Guillaume Quintard

Using obj.hits, clearly a hit and miss affair

VCL is awesome, but it's also a bit frightening to newcomers, and most of the time, people are more interested in something that "just works"™ than "doing the right thing"™ and they google their way out of it.

Problem is that the first thing that sort of works isn't necessarily the right thing, and the proliferation of one particular code snippet is what prompted the writing of this post. The snippet in question? This guy:

sub vcl_deliver {
    if (obj.hits > 0) {
        set resp.http.X-Cache = "HIT";
    } else {
        set resp.http.X-Cache = "MISS";

Recognize it? Have it somewhere in your code, maybe? If so, read on, and let's try to do the right thing, and hopefully, get a better setup thanks to it. Don't worry, this is a short one, so hop in.

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26/07/18 13:00
by Guillaume Quintard

Howto: use one VCL per domain

The Varnish Configuration Language (VCL), I'm sure you know already, is the source of Varnish versatility: by only enforcing the protocol flow and leaving the business logic to the user, Varnish can be easily configured to do things far beyond caching.

However, because the logic of websites is generally focused around hosts, and the VCL thinks in terms of processing steps, configuration may sometimes a bit odd, with the need to place safeguards around your code to ensure that logic for one host isn't applied to another one.

It works, but it can be tedious and unwieldy, so today we are going to have a look at how we can silo our VCL per website to achieve better maintainability.

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18/04/18 14:30
by Guillaume Quintard

Announcing Varnish Cash: High performance for the Blockchain

Blockchain fever has finally reached mainstream status with more than a thousand listed cryptocurrencies, and we feel that the world needs our contribution in this domain. This is why we are announcing the Varnish Cash solution.

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01/04/18 13:00
by Guillaume Quintard

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The Varnish blog is where our team writes about all things related to Varnish Cache and Varnish Software...or simply vents.


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