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How to install nagios in RHEL|Centos|Fedora - Linux

Nagios is the industry standard in enterprise-class monitoring for good reason. It allows you to gain insight into your network and fix problems before customers know they even exist. It�s stable, scalable, supported, and extensible.

Install Nagios


I First step :

Let me show you how to install nagios monitoring tool .

This installation has been tested by unixmen team in Fedora/Cenots/RHEL/ .

1- First install some tools : httpd, gcc, glib, glibc-common, gd and gd-devel

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

2- Create nagios user :

#/usr/sbin/useradd -m nagios
#passwd nagios
3- Add nagcmd group
/usr/sbin/groupadd nagcmd
/usr/sbin/usermod -a -G nagcmd nagios
/usr/sbin/usermod -a -G nagcmd apache
4- Now go to http://www.nagios.org download files .

nagios-3.1.0.tar.gz nagios-plugins-1.4.13.tar.gz nrpe-2.12.tar.gz

tar -zxvf nagios-3.1.0.tar.gz 
cd nagios-3.1.0
./configure --with-command-group=nagcmd
#make all; make install; make install-init; make install-config; make install-commandmode; make install-webconf
5- Edit your email admin address :

Go to

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


6- Create a nagiosadmin account for logging into the Nagios web interfaceassign to this you�ll need it later.

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
enter the password.

7- Restart the httpd server :

#Service httpd restart
The second step : Extract and install plugins

1- Go to you downloaded nagios tools

tar -zxvf nagios-plugins-1.4.13.tar.gz
2- cd nagios-plugins

./configure --with-nagios-user=nagios --with-nagios-group=nagios
make; make install
3- Now you have to add nagios to Chkconfig

chkconfig --add nagios
chkconfig nagios on
4- Verify if you have a good config of nagios with the command

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
5- Check if there are no errors displayed; then start nagios with command :

service nagios start
To simplify the procesure please disable the selinux and iptables and ip6tables

now open your browser and http://localhost/nagios orr http://ip/nagios


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