Documentation

The official documentation contains a install guide, a tutorial and a reference.

We're trying to keep the official documentation in sync with the code. Both are kept in same source repository and both are available online:

• Documentation for the latest release 4.1
• Documentation for the stable release 4.0
• Documentation for version 3.0 (unsupported)
• Documentation for version 2.1 (unsupported)
• Documentation for the current development version (git master)

You also probably want to have a look at the wiki - especially the VCL Examples. 

Quick install guides various operating systems:

• Ubuntu
• Debian
• Red Hat Enterprise Linux and Centos
• FreeBSD

The Varnish Book

A comprehensive user guide for System Administrators and Web Developers in book format provided by Varnish Software:

• Online Reference Guide for the current stable  release (4.0)
• Online Reference Guide for version 3.0 (unsupported)
• Get the book as a PDF download

If you have feedback or want to make improvements to the book please do so by filling issues and/or send us pull-requests.