Installing Nagios core

                INSTALLING NAGIOS CORE

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Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. First launched in 1999, Nagios has grown to include thousands of projects developed by the worldwide Nagioscommunity.

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Use any linux server Rhel, centos, fedora..etc, am using Oracle linux.


Install basic Packages:


#yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp

Starting the httpd service:

#service httpd start

Add nagios user:

#useradd nagios
#passwd nagios

creating a groud for nagios setup nagcmd and add nagios user to this group. Also add nagios user in apache group.

#groupadd nagcmd

# usermod -a -G nagcmd nagios 

# usermod -a -G nagcmd apache

Change to the following directory, download and install nagios:

#cd /opt/ 

# wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz  [search for latest versions]

# tar xzf nagios-4.0.8.tar.gz 

# cd nagios-4.0.8 

# ./configure --with-command-group=nagcmd 

# make all 

# make install 

# make install-init 

# make install-config 

# make install-commandmode

# make install-webconf

Configuring Apache authentication for nagios:

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

Adding the Httpd service to run at start up:

#chkconfig httpd on

Restarting the service:

#service httpd restart

Now install the nagios plugins:

#cd /opt 

# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz 

# tar xzf nagios-plugins-2.0.3.tar.gz 

# cd nagios-plugins-2.0.3

Install with the make file that is in the nagios plugins folder:

# ./configure --with-nagios-user=nagios --with-nagios-group=nagios 

# make 

# make install

To verify the nagios configuration use the below command:

#usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg 

Here you should see something like, 0 input errors & 0 warnings.

Now start the nagios service.

# service nagios start

Adding the nagios service to the start up:

# chkconfig --add nagios 

# chkconfig nagios on

Access nagios:

To access through web: Copy and paste the below link in your URL.

http://IP-address/nagios/          [the ip address of your server]

If we goes as expected you will  a web page like below:

Welcome to nagios core :)

We will go with adding of hosts and services in the following posts.