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check_varnish.pl v1.0 - Nagios plugin for Varnish Cache monitoring This Nagios plugin reads the output of 'varnishstat -1', which presents a one-shot look at all the internal counters that Varnish has. It can monitor any of these counters, and you can add warning & critical values for each counter individually. It will return Nagios perfdata for each counter requested. Additionally, there is one 'special' counter that doesn't exist in the varnishstat -1 output - this is 'cache_hit_percent', which is calculated like this: cache_hit_percent = ( cache_hit / ( cache_hit + cache_miss ) ) * 100 Usage: check_varnish.pl --spec=[spec definition] --spec=[spec definition] check_varnish.pl --list check_varnish.pl --help Options: --spec=[spec definition], -s [spec definition] Specifies which Varnish counter to monitor. A spec definition looks like this: --spec=counter_name,warnvalue,critvalue,[u|d] The "u" or "d" option at the end determines whether you want to consider the warn and crit values as met when the counter is above ('u' - up) or below ('d' - down) these values. e.g. for failed backend requests, you'd want to use the 'u' option (since more failed backend requests is bad thing), but for the cache_hit_percent you'd want to use 'd', since you'll only warn when the cache isn't serving as many requests from memory as you'd expect. If no 'u' or 'd' option is present, 'u' is assumed. If you don't want to set warn/crit values (i.e. just want perfdata output), then use this form: --spec=counter_name To monitor multiple counters, use multiple --spec options. e.g. --spec=counter_one --spec=counter_two,50,80 --spec=counter_three The plugin will return a WARNING state if any one counter is over its warn value, and no counters are over the critical value. Similarly, if any one counter is over its crit value, the plugin will return a CRITICAL state. --list This option prints a list of all the available Varnish counters available, and a brief description of what each one is for (taken from the varnishstat output). --help Displays this message. check_varnish.pl comes with absolutely NO WARRANTY either implied or explicit This program is licensed under the terms of the GNU General Public License (check source code for details)