Notes and howtos

• Aws
• Dns
• Networking
• Cli

Moving a Route 53 hosted zone between AWS accounts

8th September, 2026

• Tailscale
• Ssh
• Networking
• Linux

Tailscale SSH: connection refused, permission denied, and which server actually answered

5th September, 2026

• Security
• Linux

280 vulnerabilities, one unused package

4th September, 2026

• Linux
• Infrastructure

mount.cifs said the credentials were formatted incorrectly. It was right.

28th August, 2026

• Docker
• Aws
• Debugging

LocalStack exited with code 55 after a routine image update

22nd August, 2026

• Linux
• Bash
• Cli

The filename that works in bash and breaks in zsh

18th August, 2026

• Css
• Sass

Dart Sass quietly reordered my CSS

14th August, 2026

• Php
• Mysql
• Azure
• Networking

"Cannot connect to MySQL using SSL" is a hostname problem

10th August, 2026

• Email
• Llm
• Aws

Never let the LLM write the subject line

6th August, 2026

• Docker

Restate's default node name is your container hostname

28th July, 2026

• Php
• Symfony

Symfony 8 ignores your #[Groups] attribute

23rd July, 2026

• Azure
• Postgresql
• Networking
• Cloud

The database was fine. The cloud around it wasn't.

13th July, 2026

• Tailscale
• Ssh
• Networking
• Linux

Tailscale SSH fails with "tailnet policy does not permit access"

20th June, 2026

• Openvms
• Legacy
• Modernization
• Architecture

Modernization usually means rewriting everything wrong

15th June, 2026

• Aws
• Infrastructure
• Startups

NAT Gateway is eating your AWS bill

10th May, 2026

• Aws
• Wordpress
• Php

WordPress fleets on AWS are rotting from the database up

27th April, 2026

• Security
• Microsoft

The one setting that stops Microsoft Authenticator spam

15th April, 2026

• Php
• Apache
• Linux

Your server is running two PHP versions (and one of them is lying)

24th March, 2026

• Cli
• Docker

Stop all running containers in Docker

3rd October, 2020

• Docker

Why Docker?

1st October, 2020