Nagios plugin that measures Linux memory use as reported by the 'free' command. A PNP4Nagios graph template is include to combine the figures on a single chart.
This is plugin is based on one published on the Nagios Exchange by Lukasz Gogolin [email protected] This is a copy and fork of version 1.1 released 2012-07-22 This version 1.2 is modified in 2014 by Aaron Roydhouse [email protected]
http://exchange.nagios.org/directory/Plugins/System-Metrics/Memory/check_mem-2Esh/details
The changes aim to improve performance (fewer forks) and improve the PNP4Nagios chart a bit
Sample install steps below are for CentOS 6.5 and assume you are using nagio with check_nrpe plugin, nrpe, and pnp4nagios.
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Install and configure nagios, nrpe, and the check_nrpe nagios plugin
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Install the files for this plugin and chart
cp check_mem.php /usr/share/nagios/html/pnp4nagios/templates/ cp check_mem /usr/lib64/nagios/plugins/ /sbin/restorecon -v /usr/lib64/nagios/plugins/check_mem
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Now add the command to NRPE configuration /etc/nagios/nrpe.config
command[check_mem]=/usr/lib64/nagios/plugins/check_mem -w 70 -c 90
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Reload NRPE
service nrpe reload
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Test manually
/usr/lib64/nagios/plugins/check_nrpe -H target.host.name -c check_mem
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Now go configure the service or service template in Nagios and use as required
define service { name check-nrpe-linux-mem service_description Check Linux memory use generic-service check_command check_nrpe!check_mem max_check_attempts 1 check_interval 5 retry_interval 1 register 0 }
The pnp4nagios template name assumes you have pnp4nagios configured with "CUSTOM_TEMPLATE = 1", if not you may need to change this filename so that it matches. If you find that you get multiple charts instead of one, the template name is probably not matching.