How to Install Nagios on CentOS 8

Nagios is an open-source monitoring tool that helps you monitor the entire IT infrastructure including servers, switches, applications, and services. It provides comprehensive monitoring and alerting capabilities, enabling you to easily identify and resolve issues before they impact your users.

Here are the steps to install Nagios on CentOS 8:

Before installing Nagios, it is recommended to update the system packages to the latest version. You can do this by running the following commands in the terminal:

Nagios requires several dependencies to be installed. You can install them using the following command:

Create a new user and group for Nagios using the following command:

Download the latest Nagios Core source code from the official website using the following command:

Extract the downloaded source code and navigate to the extracted directory:

Create a password for the Nagios admin user using the following command:

Start and enable the Apache and Nagios services using the following commands:

Open your web browser and navigate to http://localhost/nagios. Enter the Nagios admin username and password that you set earlier.

After successfully logging in to the Nagios web interface, you can add hosts to be monitored. Configure the necessary checks and notifications for each host to ensure proper monitoring of your IT infrastructure.

1. Update System Packages
2. sudo dnf update
3. Install Required Dependencies
4. sudo dnf install -y httpd php gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel xinetd unzip cronie
5. Create User and Group for Nagios
6. sudo useradd nagios sudo groupadd nagcmd sudo usermod -aG nagcmd nagios
7. Download Nagios Core
8. cd /tmp wget https://github.com/NagiosEnterprises/nagioscore/releases/download/nagios-4.4.6/nagios-4.4.6.tar.gz
9. Compile and Install Nagios Core
10. tar -zxvf nagios-4.4.6.tar.gz cd nagios-4.4.6 Compile and install Nagios Core using the following commands: ./configure --with-command-group=nagcmd make all sudo make install sudo make install-init sudo make install-commandmode sudo make install-config sudo make install-webconf
11. Set Nagios Admin Password
12. sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
13. Start and Enable Services
14. sudo systemctl start httpd sudo systemctl enable httpd sudo systemctl start nagios sudo systemctl enable nagios
15. Access Nagios Web Interface
16. Add Hosts for Monitoring

Congratulations! You have successfully installed Nagios on CentOS 8. You can now monitor your IT infrastructure and receive alerts for any issues that may arise.