If you are running a mail server using Virtualmin / Webmin and testing your domain on security checkers like Internet.nl, you might encounter issues with DANE (DNS-based Authentication of Named Entities) validation. In this guide, we’ll walk through how we diagnosed a failing DANE setup, converted Let’s Encrypt certificates to the modern Elliptic Curve (EC)…Read more
IPs allocated within Docker
I needed to figure out which IPs were all allocated within my docker environment. The following command provides a list:
Using a Raspberry Pi Zero 2 W as a USB Ethernet Gadget Router on Raspberry Pi OS Bookworm (2025)
The Raspberry Pi Zero 2 W can act as a USB Ethernet device when connected to a host computer. This makes it possible to create a fully isolated, point‑to‑point network link over USB — ideal for headless access, provisioning, or embedded deployments. Raspberry Pi OS Bookworm introduced changes to the boot partition layout and USB…Read more
Authentik to IP whitelist traefik (WIP)
Disclaimer: This document is not yet finished and will be subject of change s long as there is WIP (Work in Progress) in the title of this post. For my homelab I am using as you might already know Authentik for a Single Sign On sollution. This authentik is behind a traefik reverse proxy. I…Read more
Pairing EGLO connect.z Zigbee (EGLO_ZM_RGB_TW)
I have a couple of these lights and they have quite a specific way to pair/reset the connection with the zigbee hub. The light should flash and then stay on on bright white.
Homeassistant automatic fan
I was annoyed with the manual switch in the kitchen to change the fanspeed of my WTW/HRV. So when my kitchen was remodelled I’ve removed the manual switch and moved it next to the WTW/HRV and added a zigbee relais controller for low power. Hardware The idea of the additional hardware was a zigbee enabled…Read more
Virtualmin post install
Virtualmin is some handy software if you want to self-host your domain, (web, email, etc). After installation there are some steps to follow to make your virtualmin install a bit better. I haven’t found one single piece of documentation that combines this post install best practices together. “So why not create one yourself”. A small…Read more
NanoLab
A little bit before COVID time, I had to do some work in Eindhoven on the University Campus. While I was walking between two locations I frequently had to visit, I saw this sign. I couldn’t resist the urge and made the sign a little bit more literal 🙂
Restarting vm/containers if they get swapped out
It is quite easy to over demand on the capabilities of you machine when you’re running proxmox. The most claimed resource is definately memory. If you’re really squeezing every bit of memory out of your machine, you will encounter the situation that a vm will be swapped out. So you suddenly see that your host…Read more
Ntfy notifications
Ntfy.sh is a website that offers a notification service. The fun part of this is that they also give you the possibility to self host your own ntfy server. So I’ve spun one up in Docker: Similar to my other docker containers: After the stack is running in portainer, you will have a ntfy server…Read more