While Nagios configurations, plugins and addons are still compatible with the latest Icinga version, much has changed since the initial release in May 2009. Icinga is unique as a monitoring system and an ambitious project. This can be seen in the major differences to Nagios in Icinga’s architecture, two web interfaces and reporting capabilities, features for easier addon development, as well as its open and transparent development style.

ICINGA 2: Concurrent to improving Icinga as a fork of Nagios, the Icinga Project is also actively developing Icinga 2. There are two development branches: Icinga 1.x (Nagios fork) and Icinga 2 (Core framework replacement / Nagios rewrite). Where “Icinga” is mentioned in our website and blog posts, we are referring to Icinga 1.x.

What does Icinga have that Nagios doesn’t?

To begin, Icinga offers two interfaces - “Icinga Classic” and “Icinga New Web“. For a fair comparison, we have put Icinga in both its variants against the open source ‘Nagios Core’.

See the many differences between Icinga and Nagios in not only the core and web interfaces, but also in their reporting capabilities, support and development style below.

ICINGA 2: Concurrent to improving Icinga as a fork of Nagios, the Icinga Project is also actively developing Icinga 2. There are two development branches: Icinga 1.x (Nagios fork) and Icinga 2 (Core framework replacement / Nagios rewrite). Where “Icinga” is mentioned in our website and blog posts, we are referring to Icinga 1.x.

More details… https://www.icinga.org/nagios/feature-comparison/