02-15-2011
hmmm... I don't see why Nagios can't do it.... again, our preference for Cacti has to do with they way it works and handles its interface and the maturity of the community it has.
Real time reporting usually means you're looking for something with a heavy handed poller.... which is NOT recommended. You can get very good "real time" information from controlled interval polling and that's what most these kinds of tools do.
The basically generate interval plots... not "live" data per se.
Since computer people like car analogies.... consider "miles per gallon" for a car. If I want instantaneous real time data for that... how is it possible? Well.. we could measure now and a microsecond from now... but with a small window, one sampling might show 400 mpg and the next sample might show me 1 mpg. The tools that use rrd-tool (and rrd-tool itself), understand the difficulties with such data which is why they work the way they do.
In other words it's not the right tool if you're looking for what is happening THAT VERY INSTANT.... IMHO of course.
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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)