nagios

The check plugins for Nagios are packaged separately from the main program so we'll need to download the latest version (version 1.4.14 at time of writing), compile and install those.

Prerequisites
Install the Apache web server.
Install the neccessary graphic libraries:

Requires libtool?

Nagios Base Installation
Create a nagios user and group for the program to run under:

Create the installation directory:

Some of the many features of Nagios® include:

• Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
• Monitoring of host resources (processor load, disk usage, etc.)
• Simple plugin design that allows users to easily develop their own service checks
• Parallelized service checks
• Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable

The original plugin is from http://www.openfusion.com.au/labs/nagios/
Download the check plugin:

The check command takes the syntax of check_qmailq -w count -c count [-W pre_count] [-C pre_count] [-q /path/to/qmail-qstat]. The warning and critical message counts can be adjusted to your preference. Edit /usr/local/nagios/etc/nrpe.cfg and add entries for the services you want to check, such as:



A copy of the specific plugin is also available here.

Installation
Download the plugin:

The latest version fo the plugin requires the Nagios::Plugin::Getopt and Nagios::Plugin::Functions modules for Perl be installed:

perl -MCPAN -e shell
install Nagios::Plugin::Getopt


Prerequisites for Monitoring With Nagios
These instructions assume that you have a Nagios server already set up similar to the instructions on this site.