日本語はわからないけど、
やっぱりかっこいい。
Everything published on Unix Magick.
Part 3 closes the troubleshooting series with an evidence ledger: what each test proved, which suspects were cleared or rejected, what remains open, and the exact restart point for the next session.
A practical Layer 1–7 network troubleshooting runbook built from the same incident as Part 1: capture link state first, prove VLAN and route locality, test both TCP directions, and change one variable at a time.
A bottom-up troubleshooting diary: an 80 Mbps symptom, a Fast Ethernet PoE injector, a marginal coupler panel, one-way TCP collapse, a bad VLAN test, and the local 720 Mbps result that finally cleared the AP.
How I moved a GitHub Pages site to an apex domain without moving the registrar: Cloudflare DNS, GitHub domain verification, TLS, redirects, and the checks that caught the small things.
A start-to-finish Docker Compose build for Sonarr, Radarr, qBittorrent, Jackett, FlareSolverr, Gluetun, Recyclarr, Cleanuparr, and read-only Tdarr validation.
Turning stack assumptions into executable health invariants, authenticated management checks, stateful DOWN/RECOVERED alerting, and an external dead-man monitor.
How I layered filename policy, queue enforcement, authoritative imports, safe canaries, and read-only media validation without pretending any one control makes downloads safe.
A practical way to structure a Docker media automation stack: clear service ownership, hardlink-friendly storage, and a deliberately small VPN failure domain.
A straightforward way to get a free GitHub Pages blog online, verify that it works, and only then start changing the design.
