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Install Nagios on Centos 5

Installing Nagios server and network monitoring on Centos 5 server.

Install necessary packages:
#  yum install httpd gcc glibc glibc-common gd gd-devel php

Create Nagios User account and group:
#  useradd -m nagios

Create nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user:
#  groupadd nagcmd
#  usermod -a -G nagcmd nagios
#  usermod -a -G nagcmd apache

Create Directory to store Nagios installation files:
#  mkdir /opt/Nagios

Download Nagios and Plugins.
Save file to directory /opt/Nagios:

As of this writing Nagios 3.0.6 (Stable) and Nagios Plugins 1.4.13 (Stable).
Extract the Files:
#  cd /opt/Nagios
#  tar xzf nagios-3.0.6.tar.gz
#  cd nagios-3.0.6

Compile and Configure Nagios:
#  ./configure --with-command-group=nagcmd
#  make all

Compile binaries, init script, sample config files:
#  make install
#  make install-init
#  make install-config
#  make install-commandmode

## Don't Start Nagios Now ##

Nagios has now been installed to the directory /usr/local/nagios/

Install Nagios Web Interface:
#  make install-webconf

Nagios Web Interface installed to /usr/local/nagios/share ( http conf file added to /etc/httpd/conf.d/nagios.conf )

Create Web Interface Login User.
We will create user “nagiosadmin” :
#  htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Restart The Apache:
#  service httpd restart

Install Nagios Plugins:
#  cd /opt/Nagios
#  tar xzf nagios-plugins-1.4.13.tar.gz
#  cd nagios-plugins1.4.13

Compile and Configure Nagios Plugins:
#  ./configure --with-nagios-user=nagios --with-nagios-group=nagios
#  make
#  make install

Configure nagiosadmin email address for alerts:
#  vi /usr/local/nagios/etc/objects/contacts.cfg

     email nagios@localhost ;              ##  Change this to your Email Address              

Verify the sample Nagios configuration files:
#  /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Now we can Start Nagios.
Enable Nagios to start at system startup:
#  chkconfig --add nagios
#  chkconfig nagios on
#  chkconfig httpd on
#  service nagios start

Log into Web Interface:



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