About
Who writes here and why: practical notes on Linux, Windows Server, game servers, Docker and self-hosting, all from setups actually in use.
I'm Lukas. I spend my days on servers and, judging by my home lab, most of my evenings too.
This blog is where the setups I actually run get written down: Linux boxes, Windows Server, game servers, Docker, Proxmox, monitoring, backups — plus the occasional thing that broke at an inconvenient hour and taught me something.
Why the owl
This blog now runs under the name Sudowl. It's sudo plus owl. sudo is the Linux command that gives you admin rights. The owl is the one that stays awake while everyone else is asleep. So: an owl with root rights, keeping an eye on things at night.
A few details in the logo:
- The belly is a small server rack with three slots.
- The green lights are status LEDs. Green means running.
- One eye is a normal eye, the other one is a green LED. That's the one that never closes.
The idea behind it fits in one line: your systems keep running, even at night. That's what I work on every day, and it's what most posts here are about.
Old links to blog.diengdoh.com still work and forward here.
What you'll find here
- Linux — Ubuntu and Debian setup, services, hardening, the boring maintenance that keeps things alive
- Windows Server — Active Directory, Hyper-V, IIS, PowerShell, RDP hardening
- Gameserver — Minecraft and its proxies, Hytale, Valheim, Rust, Palworld and friends
- Docker & self-hosting — Compose stacks, reverse proxies, Coolify, monitoring with Prometheus and Grafana
- Security — WireGuard, fail2ban, CrowdSec, firewall rules that don't lock you out
- AI — the parts that are genuinely useful for a sysadmin, without the hype
How the posts are written
Every post starts with something real: a server I set up, a migration that went sideways, a bug that cost me an evening. I tell the story and the fix — AI helps me turn that into a readable post: structure, wording, and double-checking commands against the docs. The setups, the decisions and the mistakes are mine.
Some of the basics guides (Ubuntu setup, UFW, systemd and friends) are written up from how I generally do things, not from one specific incident. If something's wrong or outdated, tell me — I'd rather fix it.
No newsletter, no signup wall, no tracking beyond what the server logs anyway. Just the notes.
Contact
Found an error, or got a better way to do something? I'd rather know: info@diengdoh.com