Guillaume Quintard

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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

Ending the pipe dream: when to use pipe in Varnish

As you may know, part of my job consists of helping Varnish users, both customers and community users (join us on IRC!), often looking at their VCL and see if there's anything wrong. And sometimes, there is. After all, VCL is a programming language and mistakes happen. However, one point stands out as being badly understood, and I feel it deserves a short blog post to set the record straight.

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14/03/18 14:00
by Guillaume Quintard

Configuration tales: Protecting a flaky API server

Varnish is a powerhouse, and a lot of the use cases you'll see about it are about delivering stellar performance, specially in CDN contexts. But today I'd like to share a more intimate setup that I came across recently, where Varnish shone not because of its perfomance but rather thanks to its flexibility. This should give you some ideas on how to use it more, notably back within the confines of your infrastructure.

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01/02/18 13:00
by Guillaume Quintard

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