varnisher, a purging tool

[Rob Miller]

Hi guys,

A couple of years back I posted a link here to a rough-and-ready Ruby 
script for purging pages and resources within pages without having to 
dip into varnishadm, and it seemed to be fairly well-received.

Well, I spent some time recently cleaning it up, fixing a few bugs, and 
adding a few features, and would appreciate some feedback and real-world 
testing before I go all 1.0 with it.

It came about because we'd always make changes to an individual page on 
a website that included changes to stylesheets and images within that 
page, and would end up with either overly aggressive bans (banning the 
whole domain, for example) or inconsistently cached content (where a 
page was purged but, say, the stylesheet on it wasn't, so content 
appeared weird).

With it you can:

* Purge a single URL
* Purge an HTML page along with all of the resources on that page (e.g. 
JS files, CSS files, images)
* Purge an entire domain, and optionally reindex it afterwards
* Spider a domain to keep your cache warm

Installation instructions and source code are here (its only requirement 
is Ruby 1.9.3 or above):

https://github.com/robmiller/varnisher

Naturally it relies on you having some appropriate VCL in your config 
and that your IP is in your ACL, if you have one.

Anyway, I hope that firstly it works and that secondly it's useful to 
someone else; it's been useful to us in the past couple of years! I'd 
also appreciate any feedback on what's changed in the last two years of 
Varnish that could make what it does simpler/better — especially on 
when it comes to the recommended VCL.

(It's probably best to post bug reports etc. as issues on GitHub, rather 
than to the list; I wouldn't want to contribute to noisy inboxes for 
people.)

Kind regards,
Rob

--
Rob Miller
Head of Digital

big fish®
11 Chelsea Wharf
15 Lots Road
London
SW10 0QJ

Office number: +44 (0)20 7795 0075

www.bigfish.co.uk
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