Jeff Geerling is a developer, author, and open-source advocate focused on Linux, Ansible, cloud infrastructure, and maker projects, widely known for his educational writing and popular YouTube channel.
63 articles from this blog
NTP, an atomic clock, and having a great time at the world's largest VCFSep 18, 2026I'm back from VCF Midwest 21, arguably the largest vintage compute
OpenNMC is an open-source replacement for expensive APC UPS management cards, featuring NUT support, Wi-Fi, and hot-swappable design.
Rebuilding a 1995 GPS Time Server so I don't get Telstra'dSep 4, 2026In June I purchased this TrueTime XL-AK time server, so I could learn more of the
Explores the early network time protocols RFC 867 and RFC 868, predecessors to NTP, with historical context and technical details.
A tech enthusiast builds a portable homelab for a vintage Mac demo, testing UniFi networking gear with GPS-derived NTP services.
Debugging Ubiquiti's 5G Backup on AT&T: A user tests the UniFi 5G Backup with an AT&T Business SIM, encounters issues, and documents troubleshooting steps.
A Linux kernel driver and open-source HAT enable the Steam Deck LCD to work with Raspberry Pi 5/CM4, offering a high-res, low-cost touchscreen alternative.
Hands-on review of Raspberry Pi's CM5 Programming Jig for flashing Compute Modules, including setup, pi-gen usage, and comparison with Everypin's jig.
Review of Dell XPS 13 with Intel Core 5 320, highlighting efficiency and performance compared to MacBook Neo.
Proxmox VE now officially supports 64-bit ARM, with best-effort support on other UEFI-based hardware, tested on Ampere Altra.
A Mac Studio user upgrades to 25 Gbps Thunderbolt Ethernet using a cheap OCP 2 NIC adapter, overcoming heat issues with active cooling.
Adding a backup Internet WAN on my OPNsense RouterJul 23, 2026AKA "Spectrum has gone down two weeks in a row and I'm sick of it".I've been borrowing a
A tech blogger builds a GPS time badge using AI, discussing Open Sauce, GPS accuracy, and AI-assisted coding.
QuadRF is a phased-array radio using Raspberry Pi 5 and FPGA to detect drones and see WiFi through walls, with open-source software for RF analysis.
A rare Raspberry Pi 4 'value edition' is reviewed, revealing its lower clock speed, higher price, and performance quirks.
A quick tutorial on applying LUT color grading to video footage using ffmpeg, with batch conversion examples.
Review of Framework's 10G Ethernet module, highlighting USB-C bandwidth limitations and thermal issues.
Apple's macOS 26.5 finally lets you power on a Mac remotely without pressing the power button, ending a 30-year gap with PCs.
A comprehensive review of various IP KVM devices tested in a homelab, covering features, prices, and security concerns.
Comparison of Framework 12 vs MacBook Neo for a student, highlighting performance, price, and value.
