How to install and configure Nagios Monitoring tool in redhat linux rhel5 or centos

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This article will help you to install and configure Nagios monitoring tool in redhat linux or other redhat distributions like fedora, centos etc.

Nagios Installation :
Installing packages. Apache, PHP, GCC & GD


Installing Apache web server:
#yum -y install httpd*
set hostname in FQDN
#service httpd on


Installing PHP, GCC and GD:
#yum -y install php*
#yum -y install gcc*
#yum -y install gd*

Getting the package:
Get the latest packages from net. Mov it to some directory and untar them.

#wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.0.tar.gz
#mv nagios-3.2.0.tar.gz  /usr/local/src
#tar xvf nagios-3.2.0.tar.gz

#wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.14.tar.gz
#mv nagios-plugins-1.4.14.tar.gz/usr/local/src
#tar xvf nagios-plugins-1.4.14.tar.gz

Adding nagios user and setting password for that user:
#useradd nagios
#passwd nagios
usermod -a -G nagios apache              //To permit the commands through web interface.

Configuration of Nagios:
cd /usr/local/src/nagios-3.2.0

./configure
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

Admin account setting for nagios:
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin          /passwd  for web interface
give passwd
service httpd restart

Nagios Plugin installation:
install nagios - pluggin

cd /usr/local/src/nagios-plugins-1.4.14
./configure
make
make install

Creating entry in /etc/init.d/:
chkconfig --add nagios
chkconfig nagios on

Checking the configuration:
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Alert Plugin - Mozilla Addon:
Name : Nagios Checker
[give name and url]

Configuring remotehost in nagios:
cp /usr/local/nagios/etc/objects/localhost.cfg  /usr/local/nagios/etc/objects/remotehost.cfg
[comment the hostgroup entries in order to prevent duplicate entries]
[change the localhost entries to the remote machine hostname and IP address.]

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