The best way to completely purge a Varnish cache


It's cargo-cult fighting time! Today, we are going to look at a ban expression that you probably have used, and maybe even have recommended (gasp!) to your fellow Varnish users:

req.url ~ /

We'll discuss why we use it, why it's good but mostly bad, and how to fix it. Hopefully, along the way, we'll shed some light on some Varnish internals that you can use in other situations.

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6/18/20 4:08 PM
by Guillaume Quintard

Varnish Web Developer Wiki Highlights: Cache Invalidation in Varnish with Examples

 

At the risk of sounding repetitive, cache invalidation is routinely seen, thanks to a now-immortal statement from Phil Karlton, as one of computer science's two most difficult things. 

And it's true: due to the difficult nature of maintaining real-time, up-to-date cache coherency, cache invalidation is a challenge. It's one we've been working on for just about as long as Varnish has existed.

To delve further into how exactly the different components of cache invalidation work with Varnish, here's an excerpt from the Varnish Wiki on this very subject. 

As usual, I'd like to remind you that the Wiki isn't just ours - it's also yours. I encourage you not only to take a look at it but also to contribute to it based on your own Varnish experience.

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6/22/17 12:44 PM
by Rubén Romero

Purge and proxies, a love-hate affair

So, you've started using Varnish (and you're loving it) and that constant hammering about having a cache invalidation strategy got through to you: you finally decided to write the VCL to purge objects from your beautiful cache. That's good!

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6/1/16 12:30 PM
by Guillaume Quintard

Varnish Cache Invalidation with Super Fast Purger

A couple of years ago we introduced the Super Fast Purger (SFP) as an essential feature shipped with the Varnish Administration Console (VAC). You can execute your purge directly against Varnish or against the VAC.

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3/16/16 1:00 PM
by Maryam Mehrabian

Varnish Software Blog

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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