Unit-Testing is important Obviously nobody is disagreeing with this. It's just that during ongoing development and while focusing on features and bug-fixes, testing often falls behind in priority,...
Extending Unit-Testing on Icinga2
Unit-Testing is important Obviously nobody is disagreeing with this. It's just that during ongoing development and while focusing on features and bug-fixes, testing often falls behind in priority,...
Icinga 2 DSL – Variable Scopes
Ever wondered how Icinga 2 manages all those variables, and how it knows which one to use? In this blog post, we will explore all the different variable scopes in Icinga 2, and by the end, you will know what this mysterious error message means when you see it in your...
Uncovering a Client Certificate Verification Bypass in Icinga
This is a guest blogpost from Finn Steglich. As of Icinga 2 versions 2.14.3, 2.13.10, 2.12.11, and 2.11.12 from 12th November 2024, a critical security issue affecting Icinga 2 Masters, Satellites and Agents has been addressed. Now we'd like to release some more...
What to expect from an Icinga Fundamentals training
Let's set the scene: You just started out with Icinga, maybe because you have realised your need for monitoring or you have inherited an environment. Maybe your boss just decided that this is what you are going to do now. So you are now sitting in front of the...
Icinga 2.13.1 + 2.12.6 + 2.11.11: Security and Bugfix Releases
Today we're releasing the security and bugfix versions 2.13.1, 2.12.6 and 2.11.11. The main focus of these versions is a security vulnerability in the TLS certificate verification of our metrics writers ElasticsearchWriter, GelfWriter, InfluxdbWriter and...
Releasing Icinga 2.13.0
Today we're releasing our next major version of Icinga 2. Icinga 2.13 includes many long awaited enhancements and bug fixes, but also a lot of smaller changes. Units of measurement This release adds a bunch of new and improved UoMs (Units of measurement) to Icinga 2....
Our Workflow for Security Releases using GitHub Security Advisories
We recently started using GitHub Security Advisories as part of our workflow for pushing out security releases. This post will give a brief introduction on how they work, how we use them, some of their limitations, and how we overcome them. We are still experimenting...
Icinga 2.12.5 + 2.11.10: Security Releases
Today we are releasing Icinga 2.12.5 and 2.11.10, including two security fixes that may lead to privilege escalation for authenticated API users. Depending on your setup, manual intervention beyond installing the new versions may be required, so please read the...
Monitoring the Monitor: How to keep a watch on Icinga 2
The question is (probably) older than monitoring itself: Who monitors the monitor? While Icinga comes with countless options to monitor a wide range of devices and applications, at some point you will ask yourself how you can observe if Icinga itself is having errors....
Calculating a state over multiple services
These days many setups have a lot of redundancy and you may not want to send notifications during the night, just because one of multiple http servers has a problem. This blog post will show you how to setup a single service with a state combining multiple other...
Debugging Filters and Apply Rules using the Script Debugger
Have you ever been in a situation where something in your Icinga configuration did not work as expected and you ended up doing small changes and reloading Icinga over and over again? This can be especially tricky with apply rules and filters if they don't match the...
Revoke certificate of an Icinga endpoint
A Certificate Revocation List (CRL) is a list of certificates that have been revoked by the issuing Certificate Authority (CA) before their scheduled expiration date. Those certificates should no longer be trusted. A client application such as an Icinga Agent can use...
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