If you somehow missed it, one of the certificates used by Lets Encrypt chain of trust expired this week. As expected, things broke…. including my private, filtered DNS over TLS server - SkyHole. Below is a condensed form of my notes to create the exact document that I wish I had while trying to triage broken DNS on my phone.

TL;DR: Implement solution 3 from this post.

Note: After releasing the initial version of SkyHole, I re-factored most of the code to eliminate the dependency on Docker. This was to make the project easier to deploy on resource constrained hardware. At the time, I was working with SaltStack a lot and took the opportunity to re-do the entire thing as a salt state for a bit of practice. The exact steps and commands shown below are unique to my particular instance. Use them as guidance for fixing an issue with the publicly released version of SkyHole.

EDIT: (2021-09-19): After some back and forth with /u/Laxarus, there is now a simpler method! The snmp platform still does not support setting device_class, but wrapping the sensor in another template sensor is not required; just do so in your customize.yaml. I have called this out below.

This is another quick “here’s how I did it, hope this help” post.

In preparation for the inevitable grid brownouts that summer 2021 would bring, I installed a rather beefy UPS for my home network / lab. After some browsing, I discovered a local eWaste liquidator with a really good deal on some second-hand APC UPSs.