Update imprint with address.

.devcontainer/devcontainer.json

@@ -0,0 +1,41 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-docker-compose
+{
+	"name": "Existing Docker Compose (Extend)",
+
+	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
+	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
+	"dockerComposeFile": [
+		"../docker-compose.yml",
+		"docker-compose.yml"
+	],
+
+	// The 'service' property is the name of the service for the container that VS Code should
+	// use. Update this value and .devcontainer/docker-compose.yml to the real service name.
+	"service": "server",
+
+	// The optional 'workspaceFolder' property is the path VS Code should open by default when
+	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.>
+	// "forwardPorts": [],
+
+	// Uncomment the next line if you want start specific services in your Docker Compose config.
+	// "runServices": [],
+
+	// Uncomment the next line if you want to keep your containers running after VS Code shuts down.
+	// "shutdownAction": "none",
+
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "cat /etc/os-release",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,26 @@
+version: '3.8'
+services:
+  # Update this to the name of the service you want to work with in your docker-compose.yml file
+  server:
+    # Uncomment if you want to override the service's Dockerfile to one in the .devcontainer 
+    # folder. Note that the path of the Dockerfile and context is relative to the *primary* 
+    # docker-compose.yml file (the first in the devcontainer.json "dockerComposeFile"
+    # array). The sample below assumes your primary file is in the root of your project.
+    #
+    # build:
+    #   context: .
+    #   dockerfile: .devcontainer/Dockerfile
+
+    volumes:
+      # Update this to wherever you want VS Code to mount the folder of your project
+      - ..:/workspaces:cached
+
+    # Uncomment the next four lines if you will use a ptrace-based debugger like C++, Go, and Rust.
+    # cap_add:
+    #   - SYS_PTRACE
+    # security_opt:
+    #   - seccomp:unconfined
+
+    # Overrides default command so things don't shut down after the process ends.
+    # command: sleep infinity
+ 

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly

config.toml

@@ -13,7 +13,7 @@ pygmentsUseClasses  = true
 
 rssLimit = 10
 
-copyright = "2024 Daniel Kraus"
+copyright = "2024-2025 Daniel Kraus"
 enableEmoji = true
 
 [permalinks]

content/about/index.md

@@ -22,16 +22,25 @@ calculator back in the 1980's.
 
 ### [ggap-ev.org](https://ggap-ev.org)
 
+GGAP is a registered charity in Germany. This NGO uses donated money to fund the
+vocational training of young adults on the Philippines who would otherwise have
+to "earn" their living in an unlawful way.
+
 {{< figure src="ggap-ev.png">}}
 
 ### [nephrowiki.de](https://nephrowiki.de)
 
+NephroWiki is a closed wiki system that has been up and running since 2011.
+
 {{< figure src="nephrowiki.png">}}
 
 ## Portfolio -- software
 
 ### [Daniel's XL Toolbox](https://xltoolbox.net)
 
+Daniel's XL Toolbox is an add-in for Excel that assists with data analysis
+and visualization.
+
 {{< figure src="xltoolbox.png">}}
 
 Even though I haven't been able to work on this project for quite some time,
@@ -50,7 +59,7 @@ reference articles from [Pubmed](https://pubmed.gov) by PMID.
 
 ### Github Star History
 
-[![Star History Chart](https://api.star-history.com/svg?repos=bovender/LinkTitles,bovender/xltoolbox,bovender/pubmedparser&type=Date)](https://star-history.com/#bovender/LinkTitles&bovender/xltoolbox&bovender/pubmedparser&Date)
+[![Star History Chart][sh-img]][sh-link]
 
 ## Server administration
 
@@ -59,3 +68,7 @@ This includes running a mail and an IMAP server, hosting my own
 [Nextcloud](https://nextcloud.com) and [Gitea](https://gitea.io) instances,
 [Mastodon for Nephrology](https://neph.social)
 and more. Almost all of my services are dockerized.
+
+
+[sh-img]: https://api.star-history.com/svg?repos=bovender/linktitles,bovender/pubmedparser,bovender/imapcli,bovender/xltoolbox&type=Date
+[sh-link]: https://www.star-history.com/#bovender/linktitles&bovender/pubmedparser&bovender/imapcli&bovender/xltoolbox&Date

content/impressum.md

@@ -3,15 +3,16 @@ title: "Impressum und Datenschutz"
 date: 2024-07-31T12:42:53Z
 draft: false
 ---
-
 Dr. Daniel Kraus  
-H‌ö‌hen‌str‌aße 1‌5  
-65451 K‌e‌l‌s‌t‌e‌r‌b‌a‌c‌h  
 Tel. (0 61 07‌) 7 5‌6 88 4‌0  
-<bovender@bovender.de>
+Mail: <bovender@bovender.de>  
 
-Ich bitte, von Anrufen abzusehen. Über Mail oder die verlinkten
+Ladungsfähige Anschrift bei meinem Arbeitgeber: Unimedizin Mainz, Langenbeckstr.
-sozialen Netzwerke (siehe Icons) bin ich i.d.R. kurzfristig
+1, 55131 Mainz. Dies ist eine rein private Homepage und in keiner Weise von
+meinem Arbeitgeber beworben oder unterstützt. Meine Privatanschrift ist zu
+meinem persönlichen Schutz und dem Schutz meiner Familie hier nicht
+veröffentlicht. **Ich bitte, von Anrufen abzusehen.** Über Mail oder die
+verlinkten sozialen Netzwerke (siehe Icons) bin ich i.d.R. kurzfristig
 erreichbar.
 
 ## Mailserver bovender.de

content/posts/2025/install-pynitrokey/index.md

@@ -0,0 +1,58 @@
+---
+title: Install pynitrokey on Fedora 41
+description: Here's how I installed pynitrokey on my Fedora 41 KDE laptop, resolving missing dependencies.
+date: 2025-03-30T10:53:35+0100
+draft: false
+# ShowLastmod: true
+toc: false
+scrolltotop: true
+images: []
+tags:
+  - security
+  - Linux
+  - Fedora
+---
+
+{{< figure src="IMGP0069.jpg"
+    alt="My Nitrokey 3A mini"
+    title="My Nitrokey 3A mini on the right side of the picture" >}}
+
+I use [Yubikey][]s and [Nitrokey][]s as a second factor during 2FA
+authentication.
+
+My experiences with Nitrokey devices have been mixed. Currently my 3A mini
+stopped working. I wanted to investigate what's going on, only to find out that
+the commandline tool `nitropy` no longer worked on my machine either! :-(
+
+Here's how I got it to work again. I'm a Python noob, so maybe there's a better
+way to install the dependencies. The operating system is Fedora 41.
+
+```bash
+sudo dnf install systemd-devel python3-devel
+pipx install pynitrokey
+```
+
+Afterwards I was greeted with this:
+
+```text
+$ nitropy nk3 test
+Command line tool to interact with Nitrokey devices 0.8.1
+Critical error:
+No connected NK3 devices found
+
+--------------------------------------------------------------------------------
+Critical error occurred, exiting now
+Unexpected? Is this a bug? Would you like to get support/help?
+- You can report issues at: https://support.nitrokey.com/
+- Writing an e-mail to support@nitrokey.com is also possible
+- Please attach the log: '/tmp/nitropy.log._p6mpa3e' with any support/help request!
+- Please check if you have udev rules installed: https://docs.nitrokey.com/nitrokeys/nitrokey3/firmware-update#troubleshooting-linux
+```
+
+I made sure that I had the abovementioned `udev` rules in place. The key is not
+detected by any system, be it my personal Linux laptop or any Windows machine
+that I could access. [D'oh][]!
+
+[Nitrokey]: https://www.nitrokey.com
+[Yubikey]: https://www.yubico.com
+[d'oh]: https://en.wikipedia.org/wiki/D'oh!

content/posts/2025/media-mounts-at-dm/index.md

@@ -0,0 +1,80 @@
+---
+title: "[In German] USB-Sticks in den Fotostationen von dm"
+description:
+date: 2025-03-22T22:20:07+0100
+draft: false
+# ShowLastmod: true
+toc: false
+scrolltotop: true
+images: []
+tags:
+  - German
+---
+
+(This post is in German.)
+
+In den letzten Wochen habe ich ein paar Mal Fotoabzüge benötigt und bin mit
+einem USB-Stick zur örtlichen Drogerie. Zu meiner Überraschung konnten keinerlei
+Bilder auf dem Stick gefunden werden. Inzwischen habe ich das mit mehreren
+Sticks und an verschiedenen Foto-Stationen (aber immer in demselben Laden)
+probiert, Fehlanzeige. Interessanterweise hat es mit einer SD-Karte problemlos
+geklappt.
+
+Offenbar bin ich weder der erste noch der einzige, der dieses Problem schon
+einmal hatte, es gibt zu einem ähnlichen Problem mit einer CEWE-Fotostation
+einen [Forumsthread][].
+
+In diesem Blog-Beitrag sammele ich einfach mal meine Beobachtungen, vielleicht
+hilft es ja einmal jemandem. Von Mal zu Mal werde ich dies updaten.
+
+## Beispiele für "geht" und "geht nicht"
+
+Ich hatte zuletzt zwei Speichermedien dabei, einen USB-Stick und eine SD-Karte:
+
+```plain
+$ lsblk -f
+NAME        FSTYPE FSVER LABEL       UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
+sda
+└─sda1      exfat  1.0   [REDACTED]  E7F3-FDF9                             114,5G     0% /run/media/daniel/[REDACTED]
+sdb
+└─sdb1      exfat  1.0               7FDE-A701                               119G     0% /run/media/daniel/7FDE-A701
+```
+
+`sda` ist ein USB-Stick, den ich häufig in anderen Zusammenhängen im Einsatz
+habe. `sdb` ist eine ältere SD-Karte. Beide haben nominell 128 GB Kapazität, und
+beide haben eine Partitionstabelle im herkömmlichen MSDOS-Format und eine
+Primärpartition, die mit dem Dateisystem EXFAT formatiert ist. Das Dateisystem
+auf dem USB-Stick hat ein Label, welches aus wenigen Buchstaben ohne
+Sonderzeichen besteht.
+
+Auf beiden Speichermedien hatte ich denselben Foto-Ordner kopiert, mit etwa
+einer Handvoll Fotos. Die Bilder lagen also auf beiden Medien in einem
+Unterorder.
+
+**Interessanterweise wurden die Bilder auf der SD-Karte gefunden, die Bilder auf
+dem USB-Stick jedoch nicht.**
+
+Hier meine Beobachtungen im einzelnen, denn entsprechende Überlegungen findet
+man auch im Netz:
+
+### Dateisystem
+
+Bevor ich es sowohl mit dem Stick als auch mit der SD-Karte probierte, habe ich
+folgende Dateisysteme auf dem USB-Stick ausprobiert:
+
+- EXFAT
+- FAT32
+
+Mit beiden Dateisystemen wurden keine Bilder gefunden.
+
+### Root-Verzeichnis vs. Unterverzeichnis
+
+Es hat keinen Unterschied gemacht, ob ich die Bilder (JPG-Dateien) im
+Wurzelverzeichnis oder in einem Unterordner auf dem Stick hatte.
+
+### Verschiedene Terminals
+
+Ich habe meinen USB-Stick an verschiedenen Foto-Terminals ausprobiert, an keinem
+von ihnen wurden die Bilder gefunden.
+
+[Forumsthread]: https://www.cewe-community.com/forum/fb/viewtopic.php?t=13036&p=135162

content/posts/2025/nvidia-drivers-on-fedora/index.md

@@ -115,5 +115,13 @@ If it doesn't, but instead complains along the lines of
 
 then there is something wrong.
 
+---
+
+## Addendum 2025-04-17
+
+Yesterday I upgraded from Fedora 41 to Fedora 42 (KDE), and of course the NVIDIA
+drivers were removed. Using the instructions above effortlessly installed the
+driver (currently version 570). :-)
+
 [Darktable]: https://www.darktable.org
 [RPM fusion]: https://rpmfusion.org

content/posts/2025/soleier/index.md

@@ -0,0 +1,116 @@
+---
+title: "Soleier: Pickled eggs for Easter"
+description: >
+  Pickled eggs – "Soleier" – are a favorite Easter tradition in my
+  family. Here's my personal recipe.
+date: 2025-04-17T17:55:07+02:00
+draft: false
+# ShowLastmod: true
+toc: false
+scrolltotop: true
+images: []
+tags:
+  - recipes
+---
+
+My family has a long-running tradition of producing pickled eggs for Easter
+breakfast. We call these "Soleier" which is a composite of "Sole" (brine) and
+"Eier" (eggs). Varous theories exist how pickled eggs came into existence, and
+there are various ways to relish these eggs. As for the theories, the reader is
+kindly referred to the [Wikipedia article][pickled eggs]
+(also [in German][Soleier]).
+
+As for the recipe and the way we eat pickled eggs in my family: read on.
+
+{{< figure src="20250414_203010.jpg"
+           alt="My 2025 Soleier preparation."
+           caption="My 2025 Soleier preparation. Smartphone raw image file edited with darktable."
+>}}
+
+## How many eggs?
+
+How many eggs you want to prepare depends on the number of people who want to
+eat the pickled eggs, the number of days you want to have them for breakfast (or
+any other meal to your liking) and last, but not least, what size of jar you
+have to prepare them in.
+
+My 1.5 L [Weck jar][] holds 13 medium-sized eggs.
+
+Typically an adult will have 2 of those eggs for breakfast. With 13 eggs, this
+leaves one spare egg (and toast), but there's usually a kid or two who doesn't
+eat these eggs in pairs (if at all).
+
+{{< figure src="20250414_203911.jpg"
+           alt="Pickled eggs with cracks."
+           caption="I love my pickled eggs to have cracks so that they let some of the brine in."
+>}}
+
+## Recipe
+
+### Ingredients and materials
+
+This recipe is for 13 eggs and a 1.5 L jar.
+
+- 13 eggs
+- 0.75 L water
+- 50 g salt
+- 1-2 tablespoons of caraway seeds (if you like)
+- 1.5 L [Weck jar][] (doesn't need to be original Weck brand, of course, but must be sealed tight)
+- 13 slices of toast
+- butter
+- oil, e.g. rapeseed oil, to your liking
+- vinegar, e.g. any herb-flavored variant, to your liking
+
+### Directions
+
+You should prepare the pickled eggs a few days before you want to eat them. In
+my family we typically do this 7 days before Easter, i.e. on Palm Sunday.
+
+1. Boil the eggs so they get hard. I usually place the eggs in a pot, cover them
+   with water, and then slowly heat the water until it boils. Let it boil until
+   10 minutes have passed since the eggs were placed on the stove. Your mileage
+   may vary depending on your stove.
+2. Pour out the hot water and shock the eggs with cold tap water.
+3. Place the eggs into the jar using a clean spoon (not your hands!). I usually
+   let them drop into the jar so they get nice little cracks, this makes for
+   beautiful texture inside the eggs (see image).
+4. Add the salt and caraway seeds to the jar.
+5. Bring the water to boiling and pour it over the eggs in the jar.
+6. Close the jar.
+7. Invert the jar a couple of times (you may want to wear gloves while doing
+   this, the jar is hot!).
+8. Store the jar in a cool place -- in our house, this is usually the basement.
+
+## How to eat Soleier
+
+There seem to be two fundamentally different ways to eat a _Solei_.
+
+### Our way of eating Soleier
+
+My family's tradition is to peel two eggs, place them on a dish, cut them into
+pieces, then pour some oil and vinegar over the pieces and mash the eggs with a
+fork. This leaves an ugly mess on the plate and I will update this post with a
+picture of this year's appearance.
+
+Brown two slices of toast, spread butter on them, and eat the _Solei_ mash/mess
+using a fork while intermittently taking a bite from the bread.
+
+### The more sophisticated way to eat Soleier
+
+There is an alternative way to have your pickled eggs that supposedly is less
+messy. The [German Wikipedia article][Soleier] claims it's the 'proper' or let's
+say usual way to eat these eggs. I tried it once and I was totally unhappy with
+the experience, so I stick with our traditional way.
+
+Peel two eggs, cut the eggs into halves, remove the egg yolk and mash the egg
+yolk with oil and vinegar. Transfer the mashed egg yolk back into the eggs. I
+will look slightly less ugly, but I promise you will have a hard time getting
+all the egg yolk--oil--vinegar mixture back into the eggs, the plate will look
+like someone's been having _Soleier_ the traditional way, and when trying to put
+the egg halves into your mouth, be prepared for everyone else who sits at the
+table with you bursting into spontaneous laughter. At least that's what happened
+to me one time... ;-)
+
+[pickled eggs]: https://en.wikipedia.org/wiki/Pickled_egg
+[Soleier]: https://de.wikipedia.org/wiki/Solei
+[Weck jar]: https://en.wikipedia.org/wiki/Weck_jar

docker-compose.yml

@@ -1,15 +1,17 @@
 services:
   build:
-    image: hugomods/hugo:latest
+    image: hugomods/hugo:ci
     command: hugo 
     volumes:
       - ".:/src"
     user: 1000:1000
   server:
-    image: hugomods/hugo:latest
+    image: hugomods/hugo:ci
     command: server --buildDrafts --buildFuture
     volumes:
       - ".:/src"
     ports:
       - "127.0.0.1:1313:1313"
     user: 1000:1000
+    environment:
+      - TZ=Europe/Berlin