Guillaume Quintard

Recent Posts

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

Stay sane: Drain to avoid pain and bane

Some time ago, we discussed backend pools and how to load-balance inside them using directors, remember? During the first post I hinted at forcing backends to "sick" before maintenance of a backend but didn't go into more detail. Today it's time to have a short yet closer look at how you can cleanly take a backend out and insert it again.

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13/12/17 13:15
by Guillaume Quintard

Painful Varnish mistakes

This post was initially titled "Top 6 Varnish mistakes", to echo Espen's blog.  Even though his material is three years old, the content is still relevant. Plus, there's a healthy colleague competition going on here, and I can't just mimic Espen if I hope to beat him, so I had to do something different.
 
Instead, I'm going to compete on brutality: this post isn't about explaining the most common mistakes, but rather the ones that can really kill your service, one way or another. I know it sounds a bit scary, and it is, but that's for your own good, really. So buckle up, and let's see what I have in my Little Shop of Errors.
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21/11/17 14:16
by Guillaume Quintard

Varnish and Docker: First contact

Docker has been on my radar for quite some years now, but, I have to admit, as a C developer, I never really cared about it. I run Arch Linux on my computer, so everything I ever needed was packaged, save for a few exceptions where I could just whip up a custom PKGBUILD and install the resulting package. If I needed another OS, I used a VM.

But recently, I forced myself to try that container thingy (much like you'd try again some food you wrongly discarded as uninteresting when you were a child), and I found that I could find a few use cases for it, related to Varnish, of course. This post is a report of my exploration, so, don't expect too much new stuff, but since it's also focused on running Varnish inside a container, so there a few specific tricks and questions to be aware of.

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30/08/17 13:01
by Guillaume Quintard

All things Varnish related

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

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