Nagios Tutorial

Nagios is an open-source monitoring system that is mainly used to monitor the performance of servers, network equipment, and other network resources.

Learn Nagios monitoring tool - Linux Concept

You will learn Nagios here in the easy steps with fast and fun. Here, you will get complete Nagios tutorial in easy to follow manner which will help you to increase interest in monitoring tools and related open source technologies. It will also help you to enhance your carrier as a Linux (System engineer, Administrator, Lead, or Manager) professional in the corporate world.

In this Nagios tutorial, we will cover several topics in following 10 Units:

  1. Getting started with Nagios
  2. Configuring Nagios
  3. Using the Built-in Web and Additional Interfaces
  4. Using the Nagios Plugins
  5. Notifications and Events
  6. Passive Checks and NRDP
  7. Monitoring Remote Hosts
  8. Monitoring Using SNMP
  9. Advanced Monitoring
  10. Programming Nagios
Start from Introduction - Linux Concept

Getting started with Nagios

Nagios has been a stalwart of the open source, and monitoring industry for almost 20 years. It is designed to notify the system administrator about any network problem that arises, and can be configured to e-mail or page an administrator at any time of day.

Manage System Resource - Linux Concept

Configuring Nagios

Nagios provides a web-based UI with detailed graphs and statistics to show if a system or service is in a healthy or unhealthy state. It is a very useful tool that can help you keep your system in good health and prevent outages.

Linux Software Package Management

Using the Built-in Web and Additional Interfaces

The interface offers different ways to see things such as graphs, list of hosts, list of services, list of notifications and event logs.

Nagios offers an additional interface that can be used to monitor the status of different processes or applications.

Command Line - Linux Concept

Using the Nagios Plugins

The Nagios Plugins are open-source plugins that can monitor services and servers for availability.

Manage System Resource - Linux Concept

Notifications and Events

Nagios notifications are typically the first type of notification that users see when they log into their Nagios server. If a user has notifications turned off, these notifications will not appear on the console.

Linux File Management - Linux Concept

Passive Checks and NRDP

The NRDP is a monitoring tool that uses passive checks to monitor the health of your infrastructure. It works by continuously checking the status of your servers and other devices through passive checks.

Firewall - Linux Concept

Monitoring Remote Hosts

Nagios checks if the remote host is up and running, if it goes down, Nagios takes appropriate actions. With Nagios Monitoring Remote Hosts, you can monitor all kinds of services remotely without needing to install extra software on your remote network.

Security and Patch Management - Linux Concept

Monitoring Using SNMP

Nagios monitoring using SNMP allows for users to receive alerts when something goes wrong with their servers in real-time. It can also be done by other means such as BGP or ARP.

LinuxConcept Tutorial Linux Monitoring with Nagios and Zabbix

Advanced Monitoring

Nagios Advanced Monitoring (NAM) is a new feature that was recently introduced by Nagios Enterprises. NAM provides enterprise-level monitoring features without sacrificing common features like Nagios Core and Nagios XI.

Virtual Server icon

Programming Nagios

Nagios is a command-line program that operates on UNIX and Linux operating systems. It receives instructions from monitoring plugins, which monitor the availability and performance of computer systems by sending notifications to Nagios when changes occur.

Satish Kumar

Satish Kumar


Kumar Satish started his career as a Unix and Linux System Engineer in 2011. Kumar has professiona experience with CentOS, RedHat, Ubuntu, and Debian. He enjoys teaching others how to use and exploit the power of the Linux operating system.