How to install and configure nagios on centos

Log into the server using ssh

1.Install the following packages on the server

yum install httpd gcc glibc glibc-common gd gd-devel php

Create Nagios User account and group[root@server1 ~]#useradd -m nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

Download Nagios and recompile it:-

cd /usr/src

wget http://downloads.sourceforge.net/project

tar xzf nagios-3.0.6.tar.gz

cd nagios-3.0.6

./configure –with-command-group=nagcmd

make all

Install Nagios Web Interface:

make install-webconf

Create the nagios user:

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Restart Apache:

service httpd restart

Open the httpd conf file and add the nagios.conf file location to the include path.

vi /usr/local/apache/conf/nagios.conf

ScriptAlias /nagios/cgi-bin “/usr/local/nagios/sbin”
<Directory “/usr/local/nagios/sbin”>
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName “Nagios Access”
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd.users
Require valid-user
</Directory>

Alias /nagios “/usr/local/nagios/share”

<Directory “/usr/local/nagios/share”>

Options None
AllowOverride None
Order allow,deny
Allow from all
AuthName “Nagios Access”
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd.users
Require valid-user
</Directory>

Download and install nagios plugin

cd /usr/src

wget http://downloads.sourceforge.net/project/nagiosplug

tar xzf nagios-plugins-1.4.13.tar.gz

cd nagios-plugins1.4.13

install the nagios plugin

configure nagios email address

vi /usr/local/nagios/etc/objects/contacts.cfg

email nagios@localhost ; <<– CHANGE THIS TO YOUR EMAIL ADDRESS

Enable Nagios to start at system startup / boot

service nagios start

Access the web interface now:-

http://ip-address/nagios/