Jeff Geerling

It's difficult to cut through the noise when it comes to cybersecurity, but last week's vulnerabilities found in PHP and Node.js (not to mention a separate certificate compromise) were a big deal. I asked for @jeffgeerling.com's expertise in my story that has takeaways for all online interests.

I tested the Ubiquiti Vape Detector & Air Quality Monitor... and for $99 with PoE, it seems like a good value. Are there any caveats? (Yes and no... you need a UniFi setup to use it, but it has a really good sensor) — more info in today's L2J video: www.youtube.com/watch?v=bqBD...

Look who I found at the 45Drives Creator Summit! A wild @allanjude.com, @wendell1.bsky.social, and @lawrencesystems.com appear:

ST. LOUIS IS YOUR 2026 US OPEN CUP CHAMPIONS 🏆

This might be the most watched GitHub Actions build in the history of the platform: github.com/docker-libra...

PHP Security Advisories are out: RCE via OOM corruption (9.2/10): github.com/php/php-src/... RCE via stale global state (9.2/10): github.com/php/php-src/... Need to upgrade to 8.2.35, 8.3.36, 8.4.27, or 8.5.12 ASAP to mitigate. Updates rolling out now. #PHP

Nota bene: make sure you switch to official repos if you want to patch your PHP servers via package manager today. (Love Remi's repo though, saved my bacon many times)

If you run any kind of PHP application on your server... it's time to patch. Except... the patch is not here yet. Some info here: jackalsyn.com/posts/php-up... - but disabling upload progress *may* help, it's just not the full fix: session.upload_progress.enabled = Off

I had a great deal of fun talking to @jeffgeerling.com and his dad last month. I asked the Geerlings for their insight on the broader radio landscape — including recent FCC mandates. “Every time you connect something to the internet, you should be thinking about security,” Joe said.

It was great talking to @joewiz.org at @stlpubliclibrary.bsky.social about our wild hot dog RF experiments with AM radio for @stlonair.bsky.social ! www.stlpr.org/show/st-loui...

Formlabs sent me a Form Studio 1 resin printer to test. It's $699 (compared to Form 4, it's almost 4x cheaper!), and it prints well. But I also talked to their engineers a bit about value engineering, and why they dropped the Raspberry Pi in this model: www.youtube.com/watch?v=4l9x...

Joe and Jeff Geerling were shocked when an actual radio signal could be heard playing out of a burning hotdog after it touched an AM radio tower in St. Charles. The moment led to millions of views on YouTube TikTok. The father-and-son duo are talking about that moment now on "St. Louis on the Air."

I opened up a mystery chip; it turned out to be a "switched capacitor filter" from 1984. Filters are important circuits, for example, adjusting the bass or treble in an audio signal. This chip, the MF10, was popular because it combined two filters into an easy-to-use chip. Let's take a closer look…

The Radxa Dragon 8QB is more than 2x faster than the Pi 5, has tons more I/O, and only costs a little more... but good luck finding one :( Today's video goes into the details: www.youtube.com/watch?v=KUUu...

NTS-200 NTP Time server from early 2000s was handed to me at VCF Midwest. It works! Just... off by 19 years ;) I put a DC block on the antenna input though, don't want it to fry my GPS splitter! I may be able to get it to 2026, we'll see.

So happy to celebrate Ostomy Awareness Day with my beautiful wife (after this morning's @uoaa-ostomy.bsky.social fundraiser livestream), the same week as our anniversary — 16 years in, still learning new things together daily!

45 minutes until the annual livestream! Let's upgrade the SE/30 to the gills! www.youtube.com/live/-vtFNuP...

RAM's so expensive I don't know if I'll ever upgrade my PCs again. So join me tomorrow while I upgrade my 1989 *Mac* SE/30, for the annual UOAA Ostomy Day fundraiser livestream! 9a Central / 10a Eastern / 2p UTC: youtube.com/live/-vtFNuP...

AAAAH FIBER!!! After four years of pestering AT&T, it is finally here! (And I can finally join the NTP Pool... eventually, it'll be a video of course!)

Joe is a seasoned radio engineer. Jeff is an accomplished software engineer and has crafted a big YouTube following. Put them in a (virtual) room together and that's where the fun begins! I had a great time chatting with @jeffgeerling.com and his dad. Radio and IT are more alike than you may think.

ShadyTel builds an entire phone company for one weekend, every year, at VCF Midwest. This year they added a GNSS frequency standard for their T1 network, and it was sitting under my NTP Time table! Video: www.youtube.com/watch?v=pQdx...

Super Early Bird and Early Bird tickets sold out in <24h, and it's possible the rest of the tickets will be gone this week 😅 Trying to expand capacity a little, we'll see... I will also post hotel room block info soon. With how many people are coming from out of town, it'll probably fill up fast.

Super Early Bird and Early Bird tickets sold out in <24h, and it's possible the rest of the tickets will be gone this week 😅 Trying to expand capacity a little, we'll see... I will also post hotel room block info soon. With how many people are coming from out of town, it'll probably fill up fast.

Raspberry Pi is locking down RAM upgrades in firmware: www.youtube.com/watch?v=ltof...

I thought I had the best time at the largest vintage computing event in the world. But then someone rolled up with a cesium atomic clock, and I was no longer sure... My video covering VCF Midwest is here: www.youtube.com/watch?v=oW-H... #vcfmw

If you're at VCF Midwest, come all the way to the back corner and check out my NTP Time demo on a bunch of old Macs! (Starring an Xserve G5 with an acrylic cover). Also check out Mr. Macintosh's rack full 'o Xserves across the pod! #vcfmw

I'm outta time! I'm packing for VCF Midwest today, but did finish up the last three projects for my NTP Time demo on old Macs: Xserve G5, Mac SE/30, and iBook G3 Clamshell (over AirPort Wi-Fi!). #vcfmw Also a bonus look at AppleTalk-based time transfer: www.youtube.com/watch?v=h3RW...

Everyone out here talking about Apple's new phones. I'm just interested in their design labs running a Raspberry Pi CM4-based resin printer, front and center in this shot lol

APC/Schnieder discontinued their UPS NMC2 in 2022. Rather than upgrade to their proprietary $470 NMC3, NetCube Systems Austria built an open replacement, the OpenNMC. I've been testing one. It's a drop-in upgrade, and it includes NUT! Video here: www.youtube.com/watch?v=4sw8...

Coming to VCF Midwest? If you're like me, it's hard trying to remember where everything is, especially with VCF taking up the ENTIRE expo hall this year. So I made this tool last night: geerlingguy.github.io/vcfmw21-map/ Now it's a lot easier to find exhibitors! #vcfmw

BigMaclock, LilMaclock (Big one is using NTP)

I restomodded a 1995 GPS Time & Frequency Server, and learned wire wrapping, a little GPS history, and how to avoid the Telstra back-to-2006 bug. Video: www.youtube.com/watch?v=CivR...

Wire wrapping is neat. Never tried it before, but now I have and I love it for prototyping! (And no that is not AI-generated, somehow the physics of wire wrapping results in these beautiful little towers of gas-tight low-resistance connections!)

A little Mac SE/30 surgery leading up to #VCFMW 21! <2 weeks remaining until VCF Midwest 😬

Guess what I'm installing in this 1995 GPS Time Server?

I needed a mini mobile homelab setup for VCF Midwest, and I've never used UniFi gear before. Thus I built this tiny homelab network rack, that fits in my carry-on luggage: www.youtube.com/watch?v=qclC...

Even without a total eclipse, tonight's lunar eclipse was a beautiful sight. #stlwx did not let us down, not a cloud in sight! #lunareclipse 📷 Sony A6700 w/ Celestron Nexstar 90GT

Go look at the moon!

Every once in a while a mini rack pops up in the build showcase that makes my jaw drop a bit... this is the first horizontal-layout mini rack that I've seen, and the aesthetic reminds me of some NASA-esque cleanroom computer. Source: github.com/geerlingguy/...

If you've never been in a Micro Center before... www.youtube.com/watch?v=rqGT...