Category: Code

  • Running emoncms in a Linux container

    Running emoncms in a Linux container

    When I was renovating the house I currently live in, I picked up an EmonTx v3 and some clip-on current sensors from so that I could monitor the house power consumption more accurately than just getting a bill every 2 months from my energy supplier (even with a smart meter installed, they only provide […]

  • Rebuilding Cricalix.Net – Part 4

    While on holiday, I read a forum post that mentioned a “new” web server called Caddy. I took a look at it, and was intrigued by the integrated TLS certificate renewal using Let’s Encrypt. With NGINX or Apache, I have to run Certbot or similar to maintain the certificates, and I have to deal with […]

  • Rebuilding Cricalix.Net – Part 3

    Rebuilding Cricalix.Net – Part 3

    Stumbling blocks and annoyances NGINX and certbot’s default permissions EFF’s certbot writes certificates to /etc/letsencrypt/live/<certificate hostname>/<files>.pem, and sets the permissions to only allow root to read the files. This makes sense from the perspective of a system where processes that need certificates will probably spawn as root, read the certificates to memory, and then spawn […]

  • Rebuilding Cricalix.Net – Part 2

    Rebuilding Cricalix.Net – Part 2

    LXD’s Documentation It’s mostly decent. It’s got a lot of detail on what all of the configuration sections are and generally provides examples. What I find missing is a set of practical documentation that guides someone through getting started with LXD – weaving together all of the configuration for devices, proxies, storage volumes, profiles and […]

  • Rebuilding Cricalix.Net – Part 1

    Rebuilding Cricalix.Net – Part 1

    I’ve been hosting and other domains on Linode for years. There have been a few hiccups over that time-frame, but it’s generally been smooth sailing. The current VPS runs NGINX for web hosting (it was Apache until earlier this year), Postfix for SMTP, Courier for IMAP, and OpenVPN for VPN. Everything runs on one […]

  • Colour-cycling a Christmas Star

    Colour-cycling a Christmas Star

    A few years ago, at a Christmas market in Germany, I bought myself two pack-flat cardboard stars. They’re meant to use a specific light fitting, but in 2019 I bodged them on top of some simple bedside lamps from Woodies, and in 2020 I hung one using a USB cable that was connected to a […]