Nagios installation step by step in centos/redhat or fedora part 1

What is Nagios?

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

 It has the capability of monitoring application, services, entire IT infrastructure. It has been designed with scalability and flexibility in mind, Nagios gives you the peace of mind that comes from knowing your organization’s business processes won’t be affected by unknown outages.

Nagios is a one of the best open source tools available in the market that provides you with instant awareness of your organization’s mission-critical IT infrastructure. Nagios allows you to detect and repair problems and mitigate future issues before they affect end-users and customers.

Installation Steps:

Step 1: Install Dependencies and Required Packages

We are assuming that you have fresh installed CentOS, Red hat or Fedora systems, So our first requirement is to install LAMP . You have not installed LAMP server, Please click here for LAMP installation steps or Click on the below link.

http://blog.eduguru.in/install-lamp-server-apache-mysql-php-on-rhel-centos-scientific-linux-6-56-4/

Install Packages:

Start Services:

Step 2: Create User Accounts

Now create a new nagios user account and setup a password to this account

Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.

Step 3: Install Core Service

After installing required dependencies and adding user accounts. Lets start with Nagios core installation. Download latest nagios core service from official site.

Now use below command to setup apache configuration for Nagios installation.

Step 4: Configure Apache Authentication

We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.

Now restart Apache service to make the new settings take effect.

Step 5: Install Nagios Plugins

After installing and configuring Nagios core service, Download latest nagios-plugins source and install using following commands.

Now compile and install nagios plugins

Step 6: Verify and Start Nagios

Use the following commands to verify nagios install and start nagios core service.

Also configure nagios service to start on system start

Step 7: Access Nagios in Web Browser

Nagios creates its own apache configuration file /etc/httpd/conf.d/nagios.conf. There are no need to make any changes to it. Simply open below url in browser.
[change your domain or ip]

 http://192.168.0.5/nagios/

Login with new created login credential.

Now you have successfully installed and configured Nagios core service in your system.

Reference:

http://www.nagios.org/about
http://www.nagiosql.org/documentation.html

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