How to Install Nagios on CentOS 6

Nagios is a powerful open-source monitoring system that enables you to monitor your network, servers, and applications. This guide will walk you through the installation of Nagios on CentOS 6.

1. Install Required Packages

First, install the necessary packages for Nagios and its dependencies:

sudo yum install -y httpd php gcc glibc glibc-common wget unzip

2. Create Nagios User and Group

Create a user and group for Nagios:

sudo useradd nagios
sudo passwd nagios
sudo usermod -a -G nagios apache

3. Download and Install Nagios

Download the latest version of Nagios from the official website:

wget https://github.com/NagiosEnterprises/nagioscore/releases/download/4.4.6/nagios-4.4.6.tar.gz

Extract the downloaded file and change to the Nagios directory:

tar xzf nagios-4.4.6.tar.gz
cd nagios-4.4.6

Compile and install Nagios:

sudo ./configure --with-httpd-conf=/etc/httpd/conf
sudo make all
sudo make install
sudo make install-init
sudo make install-commandmode
sudo make install-config
sudo make install-webconf

4. Set Up the Nagios Web Interface

Create a Nagios user for the web interface and set a password:

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

Follow the prompts to set the password.

5. Start Nagios and Apache

Start the Nagios and Apache services:

sudo service httpd start
sudo service nagios start

6. Enable Services to Start on Boot

Ensure that Nagios and Apache start automatically on system boot:

sudo chkconfig httpd on
sudo chkconfig nagios on

7. Configure Firewall

If you have a firewall running, allow traffic on HTTP (port 80):

sudo iptables -I INPUT -p tcp --dport 80 -j ACCEPT
sudo service iptables save
sudo service iptables restart

8. Verify Installation

Open a web browser and navigate to http://your_server_ip/nagios. Log in with the username nagiosadmin and the password you set earlier. You should see the Nagios web interface.

9. Troubleshooting

If Nagios or Apache does not start, check the respective log files for errors:

sudo tail -f /var/log/httpd/error_log
sudo tail -f /usr/local/nagios/var/nagios.log

10. Further Configuration

For additional configuration and setup, refer to the Nagios Quickstart Guide and the Nagios Documentation.

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