Munin plugins for Varnish.
Project description
Introduction
A buildout recipe that packages and configures the munin tool varnish_ to enable monitoring of Varnish.
Contains a modified version of varnish_ r4439 created by Kristian Lyngstol which works with Varnish 2.0 or newer.
How to use it
You can use it with a part like this:
[buildout]
parts =
...
munin-varnish
[munin-varnish]
recipe = munin-varnish
varnishstat = ${varnish-build:location}/bin/varnishstat
Where varnish-build would be a typical cmmi part that builds Varnish. And the varnishstat option is the full path to the varnishstat binary.
This part will create a script in the buildout bin directory called munin-varnish which is used to monitor all the different aspects. The current list of aspects available for monitoring is (bin/munin-varnish suggest):
expunge transfer_rates objects uptime request_rate memory_usage hit_rate threads backend_traffic
Each of these need to be installed as symlinks into the munin-node plugins. For example:
cd /etc/munin/plugins ln -s /path/to/buildout/bin/munin-varnish varnish_expunge
Monitoring multiple instances
You can use the optional parameter name to add a name to the graph titles:
[munin-varnish]
recipe = munin-varnish
varnishstat = ${varnish-build:location}/bin/varnishstat
name = Project X
In the above Example calling graph_title Object expunging would become graph_title Object expunging - Project X.
To monitor multiple instances you need to be able to put different symlinks into your etc/munin/plugins/ directory. You can use double underscore in the symlink installation to separate the instance name from the aspect. The above installation example would become:
cd /etc/munin/plugins ln -s /path/to/buildout/bin/munin-varnish varnish_projectX__expunge
(ATTENTION: note the double underscore!).
We are using a slightly modified version of varnish_ to support multiple instances. See this post on varnish-dev for more information.
Notes
A build of varnishstat requires the developer’s libraries for ncurses. If you don’t have a varnishstat in your build of Varnish then most likely you need to install the ncurses-devel or libncurses5-dev package and then get buildout to rebuild Varnish.
The hit_rate aspect only works correctly with a munin server running version 1.4.0 alpha or better. However hit rate data is also available in request_rate where it is presented as raw rates rather than normalized as a percentage.
Credits
Michael Dunstan, Author
Harald Friessnegger, added support for multiple instances
Changelog
1.0a3 (2010-08-16)
update to newest revision (r4439) of varnish_ [fRiSi]
add support for monitoring multiple varnish instances on a single host [fRiSi]
1.0a2 (2009-11-26)
Ensure that the generated script is executable.
1.0a1 (2009-11-26)
Initial release.
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