About mfuhrmann

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So far mfuhrmann has created 14 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 [...]

By |2023-05-12T21:34:59-04:00August 6th, 2019|

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 [...]

By |2023-01-11T20:03:06-05:00October 4th, 2018|

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 [...]

By |2019-04-04T23:01:27-04:00July 9th, 2018|

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 [...]

By |2019-04-04T23:01:27-04:00June 22nd, 2018|

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 [...]

By |2023-05-15T09:38:02-04:00December 14th, 2017|

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 [...]

By |2019-04-04T23:01:28-04:00October 23rd, 2017|

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 [...]

By |2023-01-13T19:51:12-05:00September 13th, 2017|

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 [...]

By |2019-04-04T23:01:28-04:00August 15th, 2017|


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 [...]

By |2019-04-04T23:01:28-04:00August 14th, 2017|

What the…? SNMP Daemon spams my log!

As soon you provide more than a handful of services monitoring and centralized logging becomes essential. Especially when you run the Net-SNMP daemon with Docker you will notice your logs get spamed with some messages like Cannot statfs /run/docker/netns/...: Permission denied everytime you query for performance data. The Wiki article is a [...]

By |2019-04-04T23:01:28-04:00June 19th, 2017|
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