John Letey — Infrastructure

feeding opensky network

Thu, 04 Jun 2026 00:00:00 GMT

Tacked on opensky-feeder on both boxes. The same beast feed now goes out to the OpenSky Network too.

It's run by researchers and keeps the raw data around for academic work. Happy to send it my feed.

magpie watching the receivers

Wed, 03 Jun 2026 00:00:00 GMT

Built magpie. It reads each receiver's feed and works out messages per second and the furthest range it's picked up. Runs on hz01 for now, and prometheus on k3s scrapes it too.

prometheus and grafana on k3s

Mon, 01 Jun 2026 00:00:00 GMT

Stood up monitoring on the cluster. node_exporter runs on both CM4s, scraped by prometheus with grafana on top, both running on k3s.

cluster online, k3s up

Sun, 31 May 2026 00:00:00 GMT

The Turing Pi is finally online. Both CM4 nodes run Ubuntu and k3s now. cm4-1 is the control node, cm4-2 the worker.

Nothing's migrated home yet. The services are still out on hz01 / Railway.

feeding airnav radar

Thu, 21 May 2026 00:00:00 GMT

Tacked on rbfeeder on both boxes. Same beast feed now also goes out to AirNav Radar, alongside FlightRadar24 and FlightAware.

Each of the three networks pulls its weight here: FlightRadar24 is the app I open every day, FlightAware ships dump1090-fa, and AirNav makes the hardware. Feels right to give back to the projects I lean on the most.

feeding fr24 and flightaware

Tue, 19 May 2026 00:00:00 GMT

Both boxes were already running dump1090-fa. Tacked on fr24feed and piaware so the same beast feed also goes out to FlightRadar24 and FlightAware.

dump1090-fa on receivers, jet1090 on hz01

Sun, 17 May 2026 00:00:00 GMT

Both receivers were running jet1090 locally, and the ADS-B page hit them directly through hz01. Under load, that traffic would knock a receiver offline.

They now run dump1090-fa (the maintained fork by FlightAware) and push the beast feed over the tailnet. A single jet1090 on hz01 takes both streams and serves the merged feed.

hn-ntfy watching the HN front page

Tue, 05 May 2026 00:00:00 GMT

Wanted ntfy pings when items hit the HN front page. Spun up hn-ntfy on Railway, polling the HN API. It pings ntfy on every new one.

own ntfy server on railway

Tue, 05 May 2026 00:00:00 GMT

Wanted to own the infra, not use obfuscated topic names. Spun up my own at ntfy.letey.de, fully permissioned. uptime-kuma now fires through it.

uptime-kuma watching jet1090

Fri, 01 May 2026 00:00:00 GMT

Running on hz01. Probes both receivers' public jet1090 endpoints and pings me through ntfy when one goes offline.

ADS-B receiver in UK · second feed

Sun, 26 Apr 2026 00:00:00 GMT

Second receiver online. A Raspberry Pi in UK running jet1090, same setup as the DE box.

ADS-B receiver in DE · first feed

Fri, 03 Apr 2026 00:00:00 GMT

First receiver online. A Raspberry Pi in DE running jet1090, behind hz01 over Tailscale.