Monitoring multiple Varnish instances

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Published on - Listed in Varnish Linux Monitoring Icinga Nagios

To monitor Varnish performance I've been using for quite some time now. It uses the varnishadm command in the background to get all kinds of values; for example number of hits, number of misses, number of requests etc.

Varnish also allows to run in parallel of other Varnish processes, as long as:

- The work directory is different. This is handled by assigning a different work directory name (-n name) to the process. This setting is better known as "instance name", although work directory would be the technical correct naming.

- The listener ports are different. This applies to both the http listener (-a) and the management listener (-T).

The problem with It doesn't support the -n parameter to query a certain Varnish process. Or better said: It didn't support the -n parameter. I modified the plugin and created a pull request for the upstream/original plugin.

With the modifications, the plugin, is now able to monitor multiple Varnish processes/instances. And it stays backward compatible to single Varnish processes launched without -n parameter:

# ./ -f MAIN.cache_miss -n varnish-test
VARNISH OK - MAIN.cache_miss is 683744
| 'MAIN.cache_miss'=683744

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