Building a Stratum 1 NTP Server with GPS/PPS on Raspberry Pi
Turning a Raspberry Pi 4 and a u-blox ZED-F9P into a stratum 1 LAN time server with chrony, PPS, Prometheus, and Grafana, including the ntpd detour that wasted a perfectly good evening.
raspberry-pi
Reliable Headless Raspberry Pi Provisioning on NixOS
For headless Raspberry Pi bring-up on NixOS, image-time secret injection is often more reliable than first-boot decryption on the device. Here's the provisioning flow, the brittle design we tried first, and why bootstrap state belongs under /var/lib rather than /etc.