Posts

All the articles I've posted.

• Permission denied (publickey) is never a firewall problem

  6 Jul, 2026

  I spent an hour debugging a firewall that was working perfectly. The error message had told me so in its first word.

• Hardening a VPS is a sequencing problem

  18 Jun, 2026

  Every setting I changed was one line I could have found in thirty seconds. The evening went somewhere else entirely — into deciding what order to apply them in.

• Understanding Worker Pools in Go

  23 May, 2026

  You have 1,000 URLs to check. This post walks you through why the obvious approach breaks, and how a worker pool fixes it — built from scratch, explained simply.

• `errors.Is` vs `errors.As` vs `errors.AsType` — when to use which

  16 May, 2026

  Three tools, three different questions. A practical guide to Go's error inspection functions and when to reach for each one.