Linux

Router Upgrade From Hell

The day started with a plan. I would upgrade to the latest OpenWRT release with minimal disruption to the home internet, planning out the steps beforehand, and being careful not to totally mess things up. And as always reality had other ideas about how the day would go. The Original Plan I’m running OpenWRT on a PC Engines APU4 with way more disk space than it needs. The APU4 boots from the SSD like a traditional PC, not like a router booting from dedicated Flash storage, so I wasn’t sure exactly how the OpenWRT upgrade procedure would work and I wanted to make sure I had a working install to fall back on.

Running Prusa Slicer From A Rootless Podman Container

A while back Jessie Frazelle wrote a neat blog post on running desktop applications using Docker containers. It ends up that it isn’t too hard to run X clients in containers using podman or Docker . Now that I have Alpine Linux running on my laptop I need to get rootless podman setup so I can run applications that aren’t included in the Alpine distribution. Podman is a Docker compatible container engine that doesn’t require a daemon, and can run as a user without any need for root access.

An Alpine Adventure

The Ansible playbooks for this article can be found here I have a laptop that I use for experimenting with different operating systems. I’ve used it to run various Linux distributions, as well as FreeBSD and OpenBSD. I tend to set it up by hand, use it for a while, then reinstall with something new. In the most recent iteration of this I’ve used Alpine Linux to see if it would be suitable distribution for more than a container runtime.

Overly Complex Doorbell

I wanted to add some kind of doorbell indication to my office, and was almost ready to start buying parts for wired doorbell sensor like this one on hackaday.com , but I wasn’t sure how well it would work with the Beagle Bone Black that’s running my digitemp sensor network in the garage. I’d have to run about 20’ of wire over to the sensor from the Beagle and that was bound to effect the reliability.

Setting up PXE boot with qemu

I was expecting to spend the whole afternoon getting a tftp server setup so I could PXE boot some qemu virtual machines for testing. I wanted to make sure it didn’t interfere with anything else on the LAN so it would have to be limited to the user mode network I use with my vms. Typically when I try to do something like this I end up trying a bunch of different things that don’t quite work right.
Converting DICOM xray images to JPEG

Converting DICOM xray images to JPEG

I recently needed to convert a CD of xrays into jpeg images, and it wasn’t immediately obvious how to do this. The files on the CD were in DICOM format , which appears to be a commonly used format in the medical community that includes the image and extra metadata about the patient. I first used the aeskulap viewer which worked fine for viewing, but has no options (that I could find) for exporting them to regular jpeg images.

Transitioning to a New GPG Key

I am transitioning to a new GnuPG key, here is my transition statement, based on one from Simon Josefsson Here is my signed statement: - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512,SHA1 OpenPGP Key Transition Statement for Brian C. Lane I have created a new OpenPGP key and will be transitioning away from my old key. The old key has not been compromised and will continue to be valid for 30 days, but I prefer all future correspondence to be encrypted to the new key, and will be making signatures with the new key going forward.

Creating OpenStack images with livemedia-creator

I was going to write about using mock to make live iso's without using virt-install, but this week is the OpenStack Summit and one of the things you can use livemedia-creator (lmc) for is making disk images for use with OpenStack. If you followed the instructions in my previous post on creating live isos you already have everything you need except the kickstart and OpenStack. I'm not going to cover how to setup OpenStack, I used the instructions from the RDO project Quickstart without too much trouble.