Most form fields ask users for a single value like a name, an email, or a date. But some need a list of values. A plain text input with comma-separated values can technically do the job, but it...
IPL: How to use the ipl-web TermInput
Most form fields ask users for a single value like a name, an email, or a date. But some need a list of values. A plain text input with comma-separated values can technically do the job, but it...
How to Create Your Own Plugins and Check Commands in Icinga 2
If you've been using Icinga 2 for a while, you probably know the built-in checks cover a lot of ground: disk space, CPU, memory, ping. But sooner or later you'll run into something specific to your setup that no existing plugin handles. That's where writing your own...
Tips and Tricks for Handling Secrets in Icinga 2
Today, we are going to look at a few things related to handling secrets. While Icinga 2 has no dedicated mechanisms for secret handling, there are a few tricks you can do with standard features. This is not meant as a step-by-step tutorial, but rather as an...
Get Valid TLS Certificates for Icinga Web Despite a Firewall
Lots of big companies lock down their IT infrastructure in the internal network, sometimes they even use only locally mirrored repositories. I totally understand this, especially since our CVE-2024-49369. Nowadays, when LLMs find security holes even in OpenBSD, you...
Icinga 2 Meets OpenTelemetry: Native Metrics Export in v2.16
The OTLPMetricsWriter is a new Icinga 2 feature available since v2.16 that exports check plugin performance data as OpenTelemetry-compliant metrics via the OTLP HTTP protocol. With a single configuration object, it connects Icinga 2 to any OTLP-compatible backend like...
Mirroring Icinga Packages in Air-Gapped and Restricted Environments
When hosting in a secure or corporate environment, Internet access is often restricted or blocked completely. While this makes sense from a security point of view, this introduces some challenges. For one, getting software packages. There are usually two approaches to...
How to Use Git Bisect to Pinpoint Bugs Precisely
A feature that used to work suddenly broke. The problem? There were 300 commits since the last time I knew it worked. Checking each commit manually would take forever. Fortunately, Git has a tool designed exactly for this situation: git bisect. What is Git Bisect? The...
Syncing LDAP Users & Groups with the Icinga Notifications Web API
If you're running Icinga in a mid-to-large organization, chances are your users and teams are already defined in LDAP or Active Directory. Manually re-creating contacts and contact groups in Icinga Notifications Web is tedious and error-prone, but thankfully, it...
How to undo Git reset hard?
You just finished a long interactive rebase. You hit enter. Your commit history looks… wrong. There is a bunch of things that could go wrong: messed up an interactive rebase accidentally ran git reset --hard merged the wrong branch rebased onto the wrong base You...
Understanding Namespaces in Icinga 2 DSL
Last time, we explored the concept of variable scopes in Icinga 2, which help you manage and organize your DSL configurations effectively. As promised, today we'll dive into another, how shall I say, advanced topic: Namespaces in Icinga 2. What are Namespaces?...
Integrating Prometheus Metrics into Icinga Using check_prometheus
Introduction This article explains how to integrate metrics from Prometheus into Icinga checks using the check_prometheus plugin. There can be multiple reasons why this could be desired: Maybe you have different teams with their own monitoring systems, and you need to...
Testing Icinga in a Homelab Setup With Nextcloud
If you want to get started with Icinga but don’t have a data center lying around, no worries. Icinga is a lightweight monitoring tool that works for both large infrastructures and small home labs. When I first explored Icinga during my first year as an apprentice, it...
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