About mfuhrmann

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So far mfuhrmann has created 15 blog entries.

Dev-Jam 2019

Time flies and we have just finished our fourteenth Dev-Jam in fifteen years. We call it the fifth season- a group of full-time contributors, core community members, and power users get together for our annual OpenNMS Developers Conference. Our venue this year was the Yudof Hall on the University of Minnesota campus in Minneapolis. We are [...]

By |2019-08-06T22:27:43+00:00August 6th, 2019|Categories: Blog|Tags: , , , , , , , |0 Comments

Grafana Performance Dashboards

As Administrator it is sometimes necessary to diagnose performance characteristics between different servers. There are two diagnostic dashboards which can be used to compare performance metrics from SNMP agents running on Microsoft Windows and Linux. The performance metrics are collected with the out-of-the box configuration on a OpenNMS Horizon and OpenNMS Meridian and are published on the Grafana dashboard repository. [...]

By |2019-04-04T23:01:26+00:00October 4th, 2018|Categories: Blog|Tags: , |0 Comments

Usage of Operator Instructions in Alarms

Monitoring services or metrics and getting alarms isn't complicated. A more interesting question is: How to fix them (fast)? Monitoring systems, even in small or middle sized environments, creates a lot of different alarms. When you are working in a team, sometimes the person who creates a test or configures a threshold that throws an alarm [...]

By |2019-04-04T23:01:27+00:00July 9th, 2018|Categories: Blog|Tags: , , |0 Comments

Smart Debug Logging

Sometimes you have to set a specific OpenNMS daemon to DEBUG mode to find issues in your configuration. Depending of the environments size OpenNMS can create many log entries while being in DEBUG mode. But in some cases the log rotation is faster than an editor can open a log file and the amount of logs [...]

By |2019-04-04T23:01:27+00:00June 22nd, 2018|Categories: Blog|Tags: , , |0 Comments

Monitor LXC container processes using HostResourceSwRunMonitor

A monitoring solution should always help in bad situations and provide a useful overview of your system health status. Service availability monitors are especially handy to ensure that all services are running on the correct machines. In past, I have run into an problem which was more of an issue with documentation than a classical monitor [...]

By |2019-04-04T23:01:28+00:00December 14th, 2017|Categories: Blog, How To|Tags: , , , |0 Comments

Sneak peek IFTTT integration in Horizon 21

People familiar with production lines are familiar with using Stack Lights to indicate the status of a machine. Wouldn't it be cool to have something similar as a status indicator for your IT-Infrastructure? This question is probably ~20 years old and we've ended up with things like the USB Table Traffic Light that you can buy now for arround 70,-€. [...]

By |2019-04-04T23:01:28+00:00October 23rd, 2017|Categories: Blog|Tags: , |0 Comments

Monitoring Storcli based Megaraid/LSI RAID controllers

What happens when there are broken disks and degraded RAID volumes and nobody knows about them? Monitoring disks and RAID volumes is a fundamental part of rolling out a monitoring solution. Unfortunately, manufactures for RAID controllers create their own tooling, which makes it difficult to monitor them using generic monitoring protocols. If you are familiar with [...]

By |2019-04-04T23:01:28+00:00October 4th, 2017|Categories: Blog, How To|Tags: , , |0 Comments

Monitor your Synology NAS with SNMP

Network Attached Storage devices are very popular in small or medium offices or at home to store and share data. Synology is one of the manufactures who build their devices with SNMP support to provide monitoring and managment capabilities. This makes it very easy to let OpenNMS keep an eye on your NAS and it can tell [...]

By |2019-04-04T23:01:28+00:00September 13th, 2017|Categories: Blog, How To|Tags: , , |0 Comments

Load Thresholding

System has high load! Sounds anything but perfect. At least when we are talking about servers. Fortunately, I don't have to explain what load is or how it's defined because there are many explanations on the internet. I found my favorite one on blog.scoutapp.com. Once you read the article, you know that the ideal load on a [...]

By |2019-04-04T23:01:28+00:00August 15th, 2017|Categories: Blog, How To|Tags: , |0 Comments

Statusbox

Hey folks, maybe you still remember the discussion about the Statusbox feature which Markus started at the Easterhack session. At that time I already liked the idea and to be honest, I was a little bit disappointed that it wasn't possible to complete it on this weekend. After some days I read Markus' comment in his pull request: As this feature [...]

By |2019-04-04T23:01:28+00:00August 14th, 2017|Categories: Blog|Tags: , , |0 Comments