raspi-cluster

I love this because it uses UDP _and_ a CYD (Cheap Yellow Display, which is what we hardware nerds have taken to calling these). I have two or three of these around, one as a 3D printer remote, another as a pseudo logic analyzer, and a caseless one that I use as a Micro Python sandbox. I've been using UDP to send CPU stats for my machines for ages (https://github.com/rcarmo/raspi-cluster/blob/master/tools/se... is a good example), and in modern networks it has become very much reliable (99.99% so on a LAN). Keeping an eye out for UDP on an ESP32 and running Wireguard might be a little power intensive to ever get this running on battery even if it had an e-paper display, though.

I think this is a sort of rite of passage. I just realized that https://github.com/rcarmo/raspi-cluster is TEN YEARS OLD now…

You can easily put together something that will send UDP packets with stats at regular intervals. I’ve done that a number of times - https://github.com/rcarmo/raspi-cluster/blob/master/tools/se...

I like the trays. Back when I rebuilt mine from Pi 1Bs to 2Bs* I printed a vertical holder where the Pi itself was the slottable unit, but if I were to rebuild mine today I'd print some trays and use an existing box. One thing that I did that might make sense for that setup was that my master has a Wi-Fi dongle and performs NAT/DHCP for the other Pis - this makes it easier to do a lot of stuff, including auto-configuration. * https://github.com/rcarmo/raspi-cluster

This is neat. I've been doing the same with Pi 1s and 2s for a few years (http://github.com/rcarmo/raspi-cluster) but stopped short of upgrading to 3s and 4s because of heat/power/cost. I've found that it is possible to run k3s on SD cards quite well if you're patient, but that the Pi 2 master node spent a _lot_ of time just doing internal stuff even on an otherwise idle cluster, so I went back to Swarm. (I also had quite a bit of trouble with setting up a container registry, which was hard and undocumented in the first few releases of k3s. Ingress was also a bit of a pain, it's much easier to get traefik working in Swarm...)

I've done digital signage, controlled servos, used them as cameras, the works. Right now I have: - A 5-node Pi 2 cluster running k3s.io (https://github.com/rcarmo/raspi-cluster), and a separate Pi 2 I use as a Docker build box and local Docker registry. - A Pi 4 as a "lab" desktop computer with an USB oscilloscope and FTDI cables to flash ESP8266 and Arduinos - A Lakka.tv arcade/MAME box for the kids with a PS3 controller (no room for a proper PiCade, we just use the TV) - A Pi 3A+ with a mic array for playing around with Google Assistant - Another one that I carry with me as a “pocket server” to SSH into from my iPad over Bluetooth - A Pi Zero W taped to the inside of my electricity meter trying to estimate power consumption (we have a spinning disk mechanical meter) - Another Pi Zero W with an EnviroPi HAT that I use to demo Azure IoT s

I've done digital signage, controlled servos, used them as cameras, the works. Right now I have: - A 5-node Pi 2 cluster running k3s.io (https://github.com/rcarmo/raspi-cluster), and a separate Pi 2 I use as a Docker build box and local Docker registry. - A Pi 3B+ as a "lab" desktop computer with an USB oscilloscope and FTDI cables to flash ESP8266 and Arduinos - A Lakka.tv arcade/MAME box for the kids with a PS3 controller (no room for a proper PiCade, we just use the TV( - A Pi 3A+ with a mic array for playing around with Google Assistant - A Pi Zero W taped to the inside of my electricity meter trying to estimate power consumption (we have a spinning disk mechanical meter) - Another Pi Zero W that I use to demo Azure IoT solutions - An ODROID U2 (Could be a Pi) running HomeKit and Node-Red for home automation, as well as a bastion cont

Yep. Only yesterday I updated the scripts for my Pi 2 cluster (https://github.com/rcarmo/raspi-cluster), and getting https://k3s.io running on a cluster of Pi4s seems like a good way to upgrade that.

This is still using original Series Bs... which are essentially obsolete by now. I stopped using them around 2 years ago: https://github.com/rcarmo/raspi-cluster Using Pi 3 boards would quadruple the number of cores and yield a 600% increase in thanks to the slightly faster default clock rate...

Neat. Anyone else at HN did something like this? Mine is at https://github.com/rcarmo/raspi-cluster (configs and some utilities included)

Well, you could go all out, grab https://github.com/chjj/term.js, plug that into termui using WebSockets or something, and it would most likely work: On the other hand, you can easily code your own without too much hassle. https://github.com/rcarmo/raspi-cluster includes a minimalist Dashing clone with a Go backend and real-time updates.

For more info, see https://github.com/rcarmo/raspi-cluster/blob/master/README.m...

I'm thinking of upgrading my Pi cluster (http://github.com/rcarmo/raspi-cluster) to a set of these boards. Mostly waiting for some benchmarks to come in and the holiday season to go away...