Nagios plugin that measures Linux memory use as reported by the '/proc/meminfo' output.

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 repo is a copy of version 1.1 released 2012-07-22 and modified by @whereisaaron. This version 1.4 has contributions by @whereisaaron, @DavidGoodwin, @eacmen.

The changes aim to improve performance (fewer forks) and the PNP4Nagios chart.

Sample install steps below are for CentOS 6.5 and assume you are using nagio with check_nrpe plugin, nrpe, and pnp4nagios.

1. Install and configure nagios, nrpe, and the check_nrpe nagios plugin

2. 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

3. Now add the command to NRPE configuration /etc/nagios/nrpe.config

command[check_mem]=/usr/lib64/nagios/plugins/check_mem -w 70 -c 90

4. Reload NRPE

service nrpe reload

5. Test manually

/usr/lib64/nagios/plugins/check_nrpe -H target.host.name -c check_mem

6. 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.