Nagios Server monitoring tool and its Installation in Centos/Fedora/RHEL

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.

Let me show you how to install nagios monitoring tool .

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

--> yum install httpd

--> 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 :

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

 then 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

Kishore