ioquake3 in a container
Once upon a time, people had no internet access, or it was very expensive and slow. To have some fun, they spent weekends with their friends and hung out playing games over a local area network. It was so much fun it gained some interest and the space from your friends house was just too small for all the people. Parents and families went crazy and electric bills went through the roof. Continue reading
This website is not available in your country
Note to my future self. You might find yourself in a situation where you are blocked from an internet service because of your geographic location. A way to get around is using a VPN from a friend in a non-evil geographic location or using a 3rd party VPN service. Sometimes you don’t have that option right away and you need something quickly - Torbrowser for the rescue. Download and install the latest Torbrowser. Continue reading
BGP monitoring playground
Monitoring BGP can be done in various ways. First thing people want to know is if there is a way to get notifications in case a BGP peering session goes down. A pretty common way monitoring the BGP peering session state is using SNMP and the RFC1269 MIB. In OpenNMS Horizon we have the BGP session monitor which allows to track the state using the BGP peer table. The downside is, you need to configure for every peering session a monitor and this can be cumbersome and hard to maintain. Continue reading
OpenNMS Horizon, Docker, Traefik and Let's Encrypt
I work from home for over 6 years now and especially when you like networking, want to get stuff up and running and breaking it - you start looking around :) You’ve heard about k8s, k{0,3}s or Microk8s but you don’t want to use it to run your private blog and you find yourself in a spot where the benefits running stuff in containers justify the pain - this article might be something for you :) Continue reading
Quick manual Kafka OpenNMS stack
We have gathered a few ready-to-run Docker stacks in our public stack-play GitHub repository. But sometimes you need Kafka, Zookeeper and OpenNMS quickly on a baremetal deployment without Docker. Here a few quick notes how to get the bare minimum up and running. Zookeeper Install OpenJDK 11 JRE sudo apt install -y openjdk-11-jre Create a user for zookeeper sudo adduser --system --home /opt/zookeeper --disabled-login zookeeper Create a logs directory sudo mkdir /var/log/zookeeper sudo chown zookeeper:nogroup /var/log/zookeeper -R Install zookeeper Continue reading
Setting up a VMware Test environment
To test functions like importing OVA files in VMware ESXi and with vCenter the trial phase and a local deployment can be used. You need the following requirements: VMware Workstation on Windows or VMware Fusion on Mac OSX VMware Hypervisor ISO image to install the ESXi host system VMware vCenter ISO image for local deployment If you just want to learn how it works you can get a 60 days trial license registering an account on VMware. Continue readingIf you determine “human error” as the root cause, then you’re doing it wrong.
Jan Schaumann
VMware multipathd log spam
While I was deploying Loki with Promtail I’ve seen a lot of log spam from Ubuntu virtual machines in my VMware environment. As a note to myself and for some others who want cleaner system logs – here is what I’ve found to get rid of it. The log entries look like these here: 2021-04-07 20:14:21 opennms-bgp multipathd[693]: sda: failed to get sgio uid: No such file or directory 2021-04-07 20:14:21 opennms-bgp multipathd[693]: sda: failed to get sysfs uid: Invalid argument 2021-04-07 20:14:21 opennms-bgp multipathd[693]: sda: failed to get udev uid: Invalid argument 2021-04-07 20:14:21 opennms-bgp multipathd[693]: sda: add missing path The best article I’ve found was from SUSE describing the problems source. Continue reading