Nagios Core – IT Infrastructure Monitoring

Nagios Core is the industry-standard open-source monitoring engine that provides comprehensive monitoring of hosts, services, and network devices. It serves as the foundation for the Nagios ecosystem and has been trusted by IT teams for over two decades.

Key Features

• Plugin Architecture: Thousands of community plugins available
• Alert System: Flexible notification via email, SMS, and custom scripts
• Event Handlers: Automatic problem resolution capabilities
• State Persistence: Maintains monitoring state across restarts
• Parent-Child Relationships: Network topology awareness

Installation

Install Nagios Core on CentOS/RHEL:

sudo yum install -y gcc glibc glibc-common make gettext automake autoconf wget
cd /tmp
wget https://github.com/NagiosEnterprises/nagioscore/releases/download/nagios-4.4.11/nagios-4.4.11.tar.gz
tar xzf nagios-4.4.11.tar.gz
cd nagios-4.4.11
./configure
make all
sudo make install-groups-users install install-webconf install-config install-init install-daemoninit

Usage Examples

Define a host configuration:

define host {
    use             linux-server
    host_name       webserver1
    alias           Web Server 1
    address         192.168.1.10
}

Benefits

Nagios Core provides proven reliability and extensive customization options. The massive plugin ecosystem allows monitoring of virtually any service or device, while the active community ensures continued development and support.

Download Nagios Core