LibreNMS review 2026: a free, open-source, GPL-licensed network monitoring system forked from Observium. See features, self-hosting and alternatives.
Category
DevOps
Pricing
Open Source / Free, from Free
Verified
Not yet
Last updated
July 18, 2026
Founded
2013
iOSAndroidAPIOpen SourceSelf-Hosted
Overview
LibreNMS is a fully open-source, community-governed network monitoring system forked in 2013 from the last GPL-licensed version of Observium. It monitors network devices such as switches, routers, servers, and firewalls using SNMP-based autodiscovery.
The project is licensed under GPL-3.0 and maintained entirely by volunteer contributors, with no company controlling the roadmap, though third-party partners offer optional paid support contracts.
Key Features
LibreNMS offers automatic network discovery across a wide range of vendor hardware, historical performance graphing, distributed polling for scalability, and configurable alerting via email, IRC, and Slack.
Additional capabilities include bandwidth billing, a comprehensive API, native iOS and Android apps, and integrations with tools like RANCID, Oxidized, and collectd.
Pricing
LibreNMS is entirely free and open source with no paid software tier. Organizations self-host it on their own servers or via Docker.
Optional commercial support contracts are available from third-party partner organizations such as Config Services Ltd for teams that want a paid support relationship alongside the free software.
Key Features
Automatic network discovery — Discovers switches, routers, firewalls, and servers from vendors like Cisco, Juniper, HP, and Brocade automatically.
Distributed polling — Splits monitoring load across multiple polling nodes for large or geographically distributed networks.
Configurable alerting — Sends alerts via email, IRC, Slack, and other channels based on customizable rules.
Bandwidth billing — Measures and bills network usage, useful for ISPs and hosting providers.
Comprehensive API — Exposes device, graph, and alert data for integration with external dashboards and automation.
Native mobile apps — iOS and Android apps plus a mobile-friendly web interface for on-the-go monitoring.
Third-party tool integrations — Works with RANCID and Oxidized for config backup, and collectd for extended metrics.
Docker and traditional deployment — Installable on CentOS or Ubuntu with Apache or Nginx, or via Docker containers.
Pros & Cons
Pros
Completely free and open source with no per-device licensing fees
Broad automatic device discovery across many hardware vendors
Distributed polling scales to large, complex networks
Active community with responsive Discord and forum support
No risk of the core software being paywalled, unlike its ancestor Observium
Cons
No official vendor with a formal SLA, only optional third-party commercial support
Initial setup and tuning can require significant networking and Linux expertise
Interface is more utilitarian than some modern commercial NMS dashboards
Documentation quality varies across less common device integrations
Self-hosting means the organization owns all patching and scaling responsibility
Pricing
Self-Hosted Free N/A
Frequently Asked Questions
Is LibreNMS free
Yes, LibreNMS is entirely free and open source under the GPL-3.0 license with no paid software tier.
How is LibreNMS related to Observium
LibreNMS was forked in 2013 from the last fully open-source, GPL-licensed version of Observium, after Observium moved toward a hybrid commercial model.
What devices can LibreNMS monitor
It supports a wide range of SNMP-capable hardware including Cisco, Juniper, HP, Brocade, and Foundry devices, plus Linux and FreeBSD hosts.
Can LibreNMS scale to large networks
Yes, it supports distributed polling, which spreads monitoring load across multiple polling nodes for large or geographically spread networks.
Is commercial support available for LibreNMS
There is no official company, but third-party partner organizations such as Config Services Ltd offer paid support contracts.
How do you deploy LibreNMS
It can be installed traditionally on CentOS or Ubuntu behind Apache or Nginx, or deployed via Docker containers from Docker Hub or Quay.