What is Icinga 2 used for?

Icinga 2 is a scalable monitoring server that checks availability of network resources, sends outage notifications, and records performance data. It is a good fit for monitoring servers and services across multiple sites, and configuration-as-code monitoring setups.

Is Icinga 2 open source?

Yes. Icinga 2 is open source under the GPL-3.0 licence. Its source code is on GitHub at Icinga/icinga2 and is written mainly in C++.

Yes. Icinga 2 is open source, so the software itself is free to use. Paid plans are also available, starting at €2,000 per year.

Can I self-host Icinga 2?

Yes. Icinga 2 can be self-hosted on your own server or infrastructure.

What is Icinga 2 an alternative to?

Icinga 2 is an open-source alternative to Datadog, PRTG Network Monitor, SolarWinds Observability and Site24x7. Other open-source alternatives to Datadog include Zabbix, Checkmk and Nagios Core.

Is Icinga 2 actively maintained?

Yes. The most recent commit to Icinga 2 was on 1 October 2026, and the latest release is v2.16.5, published on 18 August 2026. The project has 2.2k stars on GitHub.

Icinga 2: open-source alternative to Datadog

About Icinga 2

Icinga 2 is the core of the Icinga monitoring platform. It checks the availability of network resources, notifies users of outages, and generates performance data for reporting. It is built to scale and can monitor large, complex environments spanning multiple locations. The code is written in C++ and released under the GPL-3.0 license as stated in the input.

Configuration can be managed with the Icinga Director, with configuration management tools, or as plain text in the Icinga DSL, a powerful configuration language. The server offers a REST API, TLS-secured distributed monitoring with clustering, and integrations with metrics and logging backends such as Elastic, Graylog, InfluxDB, Graphite, and OpenTSDB. Icinga Web 2 is required on top for the web interface.

The README links to installation, monitoring basics, configuration, and distributed monitoring documentation. Icinga suits system administrators and operations teams who need a mature, configurable monitoring system for servers, networks, and services, especially those that want infrastructure-as-code style configuration.

Key features

Availability checks for network resources
Outage notifications
Performance data generation
Distributed monitoring with clustering
REST API and configuration DSL
Integrations with InfluxDB, Graphite, and Elastic

Good fit for

→Monitoring servers and services across multiple sites
→Configuration-as-code monitoring setups

Built with: C++
Tags: monitoring; icinga; alerting; distributed-monitoring; metrics; rest-api; infrastructure; cpp

Icinga 2: questions and answers

What is Icinga 2 used for?: Icinga 2 is a scalable monitoring server that checks availability of network resources, sends outage notifications, and records performance data. It is a good fit for monitoring servers and services across multiple sites, and configuration-as-code monitoring setups.
Is Icinga 2 open source?: Yes. Icinga 2 is open source under the GPL-3.0 licence. Its source code is on GitHub at Icinga/icinga2 and is written mainly in C++.
Is Icinga 2 free?: Yes. Icinga 2 is open source, so the software itself is free to use. Paid plans are also available, starting at €2,000 per year.
Can I self-host Icinga 2?: Yes. Icinga 2 can be self-hosted on your own server or infrastructure.
What is Icinga 2 an alternative to?: Icinga 2 is an open-source alternative to Datadog, PRTG Network Monitor, SolarWinds Observability and Site24x7. Other open-source alternatives to Datadog include Zabbix, Checkmk and Nagios Core.
Is Icinga 2 actively maintained?: Yes. The most recent commit to Icinga 2 was on 1 October 2026, and the latest release is v2.16.5, published on 18 August 2026. The project has 2.2k stars on GitHub.