12-29-2008
There are generally 3 free choices: ganglia, nagios, and zenos. The latter is new and supposedly has many cool features but I have not tried it. Ganglia is used by many cluster administrators and scales well to hundreds of computers. Nagios is highly configurable and great in complex, heterogeneous environments consisting of many different hardware and service types. Just google for the tool that seems to best suit your needs.
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LEARN ABOUT CENTOS
nagios
nagios(8) Nagios nagios(8)
NAME
Nagios - network/systems status monitoring daemon
SYNOPSIS
nagios [-h] [-v] [-s] [-d] <main_config_file>
DESCRIPTION
nagios is a daemon program that monitors the status of various network accessible systems, devices, and more. For more information, please
consult the online documentation available at http://www.nagios.org, or on your nagios server's web page.
OPTIONS
main_config_file
The main configuration file. On openSUSE systems this defaults to /etc/nagios/nagios.cfg
-h A helpful usage message
-v Reads all data in the configuration files and performs a basic verification/sanity check. Always make sure you verify your config
data before (re)starting Nagios. You can also use the Nagios init script to verify your configuration - try: rcnagios check_verbose
-s Shows projected/recommended check scheduling information based on the current data in the configuration files.
-d Starts Nagios in daemon mode (instead of as a foreground process).
FILES
/etc/nagios
Default configuration directory for nagios
AUTHOR
Nagios is written and maintained by Ethan Galstad <nagios@nagios.org>. This manual page was written by sean finney <seanius@debian.org>
for the Debian GNU/Linux operating system (but it may be freely used, modified, and redistributed by others) and adapted by Lars Vogdt for
openSUSE.
sean finney, Lars Vogdt February 2006, May 2010 nagios(8)