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mhagander authored and gquintard committed bf53d1f May 14, 2020
Update documentation of vmod_var variable types
The module supports durations, ip addresses and backends which was not
listed in the documentation header. Also clarify that global variables
are string only.


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Status of this repository

Modules in this repository are generally not in active development by Varnish Software. However, any security related bugs and issues will always be a high priority, and in some cases we will accept new features to the VMODs

For Varnish Software, the maintainer of this repository, the VMODs are categorized as follows.

VMODs under development

The VMODs in this category are tcp and vsthrottle.

New features for these VMODs will be considered on a case-by-case basis, and new features will be accepted if they fit together with existing features in VMOD.

Feature complete VMODs

The VMODs in this category are xkey, saintmode, bodyaccess, header and var.

This software in this repository is considered feature complete and we do no longer accept contributions that introduce new features. The software is maintained with security and bug fixes, and contributions related to this will be accepted.

Deprecated VMODs

There are no VMODs in this category.

This software has been deprecated and is no longer maintained. Contributions will not be accepted.

Moved or replaced VMODs

VMODs in this category are no longer maintained because their functionality is covered by other functionality or newer VMODs.

In this repository there is only two such vmods:

  • cookie, that is now part of Varnish.
  • softpurge is now replaced by the purge VMOD in Varnish. Note that this VMOD is also in the "feature complete" category, since it is still needed for Varnish Cache 4.1.

General note

If you want to contribute a feature for this software, please create an issue and describe your implementation plans before you get started. This allows us to verify that the contribution is in line with the software's roadmap.

Future compatibility

Varnish has no commitment to update this software to be compatible with future versions of Varnish Cache. At the same time, the license of the sotware allows anyone to improve the product in any way, for example by making it compatible with future versions of Varnish Cache.

Varnish module collection by Varnish Software

This is a collection of modules ("vmods") extending Varnish VCL used for describing HTTP request/response policies with additional capabilities.


  • Variable support
  • Request and bandwidth throttling
  • Modify and change complex HTTP headers
  • 3.0-style saint mode,
  • Advanced cache invalidations, and more.
  • Client request body access

This collection contains the following vmods (previously kept individually): vsthrottle, header, saintmode, tcp, var, xkey, bodyaccess

Supported Varnish version is described in the CHANGES.rst file. Normally this is the last public Varnish Cache release. See PORTING below for information on support for other versions of Varnish.


Source releases can be downloaded from:

Installation requires an installed version of Varnish Cache, including the development files. Requirements can be found in the Varnish documentation.

Source code is built with autotools, you need to install the correct development packages first. If you are using the official Varnish Project packages:

sudo apt-get install varnish-dev || sudo yum install varnish-devel

If you are using the distro provided packages:

sudo apt-get install libvarnishapi-dev || sudo yum install varnish-libs-devel

Then proceed to the configure and build:

make check   # optional
sudo make install

The resulting loadable modules (libvmod_*.so files) will be installed to the Varnish module directory. (default /usr/lib/varnish/vmods/)


Each module has a different set of functions and usage, described in separate documents in docs/. For completeness, here is a snippet from docs/cookie.rst:

import cookie;

sub vcl_recv {
        set req.http.cookie = cookie.get_string();
        # Only SESSIONID and PHPSESSID are left in req.http.cookie at this point.


The source git tree lives on Github:

All source code is placed in the master git branch. Pull requests and issue reporting are appreciated.

Unlike building from releases, you need to first bootstrap the build system when you work from git:

make check # recommended

If the configure step succeeds but the make step fails, check for warnings in the ./configure output or the config.log file. You may be missing bootstrap dependencies not required by release archives.


We encourage porting of the module package to other versions of Varnish Cache.


The goals of this collection are:

  • Simplify access to vmod code for Varnish users. One package to install, not 6.
  • Decrease the maintenance cost that comes with having 10 different git repositories, each with autotools and (previously) distribution packaging files.

Expressed non-goals are:

  • Import vmods that require external libraries, like curl or geoip. This collection should be simple and maintenance free to run.
  • Support older releases of Varnish Cache.
  • Include every vmod under the sun. We'll add the important ones.

Addition of further vmods is decided on a case-by-case basis. Code quality and maintenance requirements will be important in this decision.


This code is maintained by Varnish Software. (

Issues can be reported via the Github issue tracker.

Other inquires can be sent to

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