Review: Icinga enterprise-grade, open-source network monitoring that scales

Icinga's management software is well-documented, easy to install and has plenty of plug-ins, but could benefit from an easier install

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Continuing our quest for robust, enterprise-grade open source network monitoring, we tested Icinga Core 2 (version 2.8.1) and the stand-alone Icinga Web 2 interface. Created in 2009 as a fork of the Nagios network monitoring tool, Icinga has come a long way.

We found Icinga to be a powerful monitoring tool with many great features. The Core install is straightforward and basic monitoring is easy with either pre-configured templates or plugins. However, we discovered that the Web install is a bit more complicated and could stand to be streamlined.

Icinga runs on most of the popular Linux distros and the vendor provides detailed installation instructions for Ubuntu, Debian, Red Hat (including CentOS and Fedora) and SUSE/SLES. Icinga does not publish specific hardware requirements, but our installation ran well on a quad-core processor with 4 GB RAM and this is probably be a good starting point for a basic installation.

As with most monitoring applications, storage is an important variable that largely depends on the number of hosts and services monitored and how often information is written to the log. With too little storage, the logs can easily fill up and freeze the system.

We were able to quickly install Icinga on Ubuntu 16.04 LTS with just a few simple commands at the prompt. The first step was to download the necessary files to the local repository, and then install the actual Icinga application. Icinga can be used to monitor the availability of hosts and services from switches and routers as well as a variety of network services like HTTP, SMTP and SSH.


One of Icinga’s strengths is the availability of plugins that can be used for most monitoring tasks, and as part of the installation you need to install the basic monitoring plugins to check external services. There are literally thousands of plugins available, both directly from the Icinga Exchange and from third parties. For third-party plugins from unknown sources, it is a good security practice to examine the source code and compile it yourself, or stick to known and trusted plugin authors.

Granular monitoring capabilities

Icinga provides impressive granularity as to how hosts and services are monitored. For instance, you can create what Icinga calls a ‘host object’, which is essentially a rule or task, to monitor a server.  For each server you can define what services to check,

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