10-22-2014
The presence of an ifcfg configuration file in /etc/sysconfig/network-scripts does not mean a physical interface, but rather a configuration for a connection with a device.
Look inside the other ifcfg-eth4 or ifcfg-eth5 in one of the servers that have them and that would tell you what their configuration is for.
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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)