SHSelfHostIndex

Icinga 2 vs Nagios Core

A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
IC Icinga 2 Scalable monitoring system that watches hosts and networks VS NA Nagios Core Industry classic host and service monitoring engine
FeatureIcinga 2Nagios Core
Deploy effortUnder-an-hour setupUnder-an-hour setup
Health score86 · Excellent84 · Excellent
CategoryMonitoring & StatusMonitoring & Status
LicenseGPL-2.0GPL-2.0
LanguageC++C
Setup difficultyHardHard
Min. RAM512 MB512 MB
Deploymentdocker, bare-metal, sourcebare-metal, docker, source
GitHub stars★ 2,239★ 2,045
First released20141999
ReplacesSolarWinds, PRTGSolarWinds, PRTG

What are Icinga 2 and Nagios Core?

Icinga 2

Icinga 2 is a modern monitoring system that checks the availability of network resources and notifies users of outages. It is Nagios-compatible, scales across clusters, and pairs with Icinga Web for a polished interface.

  • Distributed cluster monitoring
  • REST API for automation
  • Nagios plugin compatibility
  • Modern Icinga Web UI

Read the full Icinga 2 guide →

Nagios Core

Nagios Core is the open-source monitoring engine that watches hosts, services, and network devices, alerting when problems occur. It is highly extensible through plugins and remains a long-standing standard in IT monitoring.

  • Host and service checks
  • Massive plugin ecosystem
  • Flexible notification rules
  • Proven at scale

Read the full Nagios Core guide →

Icinga 2 vs Nagios Core: key differences

Icinga 2 is written in C++, while Nagios Core is built with C. Nagios Core is the more established project (first released 1999), while Icinga 2 arrived in 2014.

Why pick each one

Choose Icinga 2 if…

  • Scales to large environments
  • Active development and community

Watch out for

  • Steep initial setup
  • Multiple components to manage
Icinga 2 details

Choose Nagios Core if…

  • Battle-tested and stable
  • Enormous plugin library

Watch out for

  • Configuration is text-file heavy
  • Dated web interface
Nagios Core details

Frequently asked questions

Is Icinga 2 or Nagios Core better?

Neither is universally better. Icinga 2 has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.

Are Icinga 2 and Nagios Core free and open-source?

Yes. Icinga 2 is licensed under GPL-2.0 and Nagios Core under GPL-2.0. Both can be self-hosted at no software cost.

Can I run Icinga 2 and Nagios Core with Docker?

Icinga 2: yes. Nagios Core: yes.

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