Building container images for OpenNMS

The previous article described how you can build and compile OpenNMS Horizon from source. This section explains how you build container images (OCI) from the source artifacts.

Deploy base image as foundation

Running OpenNMS Horizon core, Minion, or Sentinels in a container requires shared components. Some of them are a) the JDK base image, b) some useful tools, and c) JICMP, and JICMP6.

The JDK is shared with Core, Minion, and Sentinel. JICMP, and JICMP6 are required for Core and Minion. To manage these dependencies, we have a deploy-base image created which covers the main requirements running the Core, Minion, and Sentinel server processes. Getting an efficient size was a goal and a multi-stage build approach was chosen to address it. The fist

Dealing with secrets in OpenNMS Horizon

Dealing with secrets in a monitoring platform is a tedious task. The nature of monitoring systems is providing integrations in as many systems. Here is my mental model looking at the various ways for integrating OpenNMS. Especially having a 20 year old platform gives you some very own challenges. Talking about integration of monitoring systems, In OpenNMS Horizon/Meridian (OpenNMS for short), are some places where you have just one option, and some with various options. This article should help you to get an idea where you need to deal with secrets and credentials. The north/south areas serve monitoring purpose whereas the west/east directions address scaling topics in the context of volume, geographic or feature sets.