LibreNMS: What is it and how does it work?

This article covers the LibreNMS network monitoring tool, from installation and configuration to features and usage.

Introduction to LibreNMS

LibreNMS is a powerful open-source network monitoring solution that can be used to monitor devices and services on your network. It offers a wide range of features, including support for a variety of protocols, performance monitoring, alerts, and more. LibreNMS is easy to install and configure, and it can be used on a variety of platforms. In this guide, we will cover the basics of LibreNMS, including its features, installation, and configuration. We will also show you how to use LibreNMS for monitoring and alerting purposes.

Features of LibreNMS

LibreNMS is an open source, powerful and feature-rich network monitoring system. It supports a wide range of devices and protocols, including Cisco, Linux, Windows, HP, Juniper, Dell, FreeBSD, Brocade, Citrix, F5 Networks, and more. LibreNMS also has a comprehensive web interface that makes it easy to monitor your network and view performance metrics.

Some of the key features of LibreNMS include:

  • Device Support: LibreNMS supports a wide range of devices and protocols.
  • Web Interface: The LibreNMS web interface makes it easy to monitor your network and view performance metrics.
  • Alerting: LibreNMS includes built-in alerting capabilities that can notify you of problems in your network.
  • Performance Monitoring: LibreNMS provides detailed performance information for your devices and networks.
  • Network Discovery: LibreNMS can automatically discover devices on your network and add them to the monitoring system.

Installation and Configuration of LibreNMS


In order to install LibreNMS, you must first download it from the official website. The download page offers two different ways to obtain the software – via a compressed file or via Git. It is recommended that you download the software via Git, as this will make it easier to update the software in the future.

Once you have downloaded LibreNMS, you will need to unzip it and move it into your web server’s document root directory. In most cases, this will be /var/www/html.

Once you have done this, you can proceed to the next step – configuring LibreNMS.


The configuration file for LibreNMS is located at /config/config.php. You will need to edit this file and set up the database connection details as well as your chosen username and password for the web interface. Additionally, you should also configure your SMTP settings in this file so that LibreNMS can send out email alerts (more on this later).

After saving your changes to the config file, you can now proceed to install LibreNMS. This is done by running the install script located at /install/install.php in your web browser (http://YOUR_SERVER_IP/install/install.php). The installation process is fairly straightforward and should only take a few minutes to complete.

Once the installation is finished, you can now access the web interface of LibreNMS by going to http://YOUR_SERVER_IP/ in your web browser.

Monitoring with LibreNMS

LibreNMS offers comprehensive monitoring capabilities for networked devices. It can monitor a wide variety of devices, including routers, switches, firewalls, load balancers, and more. LibreNMS also supports a wide range of protocols for monitoring, such as SNMP, ICMP, and TCP.

LibreNMS provides a web-based interface for managing and monitoring your network. The interface is highly customizable and allows you to view information about your devices in a variety of ways. You can also create custom dashboards to display the information that is most important to you.

LibreNMS also provides extensive graphing capabilities. You can generate graphs for individual devices or groups of devices. The graphs can be customized to show the data that is most important to you.

Alerting with LibreNMS

LibreNMS provides a comprehensive and powerful alerting system that can notify you of any issues with your network. You can configure alerts to be sent via email, SMS, or even push notifications to your mobile device. Alerts can be triggered by any number of conditions, such as high CPU usage, low disk space, or even a specific port going down.

LibreNMS also has a web-based interface that makes it easy to view and acknowledge alerts, as well as see detailed information about the devices on your network. The interface is highly customizable, so you can tailor it to fit your specific needs.


LibreNMS is a comprehensive network monitoring solution that offers a wide range of features and capabilities. It is open source, highly scalable, and easy to install and configure. LibreNMS provides comprehensive monitoring of networks, devices, and services. It can be used to monitor both small and large networks.

LibreNMS is an excellent choice for those looking for a robust network monitoring solution. It offers a wide range of features and is easy to install and configure. Those who are familiar with Linux will find LibreNMS to be especially easy to use.

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My name is Stefan, I'm the admin of LinuxScrew. I am a full-time Linux/Unix sysadmin, a hobby Python programmer, and a part-time blogger. I post useful guides, tips, and tutorials on common Linux and Programming issues. Feel free to reach out in the comment section.

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