matrix
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---
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title: "End of Summer 2023"
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date: 2023-08-27T15:37:00+03:00
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---
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Just before this summer I [laid out my roadmap]({{< ref
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"log/2023/roadmap-summer-2023.md" >}}) for, well, the summer. Here is a quick
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retrospective. Weird order, because it is somewhat chronological.
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Project 2: my take on universal headers
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---------------------------------------
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During [SYCL 2023][sycl2023] I was told that [Johny Marler][marler] expressed
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explicit interest in the project. I have much higher hopes in him than myself
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-- at which point I decided there are better things to do and shelved
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universal-headers. Non-ironically, I am no longer working on compiling lots of
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C++ code, so this area has less ROI for the potentially invested time.
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Project 1: city limits
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----------------------
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Showing any spatial result requires a background map. In the spirit of
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protomaps, I looked into how to host the base maps myself. That was quite a
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rabbit hole with twists and turns, designed to misguide the non-initiated.
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Since maps are simple pictures (PNG squares) with a bit of JavaScript to
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download and display them, I wanted to "keep things simple" and serve the files
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with a plain web server. Which meant pre-generating many tiles from the
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OpenStreetMap data. Turns out, this results in [5 million tiles][calculator]
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for Lithuania:
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{{<img src="_/2023/tile-calculator.png"
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alt="screenshot from geofabrik.com"
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caption="Pre-generating Lithuania to zoom level 17 would output 5 million tiles."
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hint="graph"
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>}}
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Generating 5 million tiles takes at least a day on my small server (I gave up
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after this time having decided to seek for a different approach). To generate
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tiles one still needs the usual suspects — PostGIS and friends. So
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pre-generating Lithuania with a complex process and many dependencies and then
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serving them via a web server does not really save on "simplicity".
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After I discarded the pre-generated tiles idea, I looked at how to serve them
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on the fly. This is how most of the world does it, so this is the beaten path.
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The usual OpenStreetMap stack consists of:
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1. PostGIS with all the data, and the tools to keep it up to date.
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2. [mapnik][mapnik], a map renderer. A library written in C++.
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3. `renderd`: a daemon that renders map tiles using mapnik.
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4. [`mod_tile`][mod_tile]: An Apache module that connects to `renderd` and
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spits the tiles out in HTTP.
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I have no interest in maintaining Apache for just the base maps, so `mod_tile`
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would need to be replaced. [`go_tile`][go_tile] is a good candidate. During my
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earlier pre-generation phases I found that `image/webp` are about half the size
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of PNG. As a result, `mod_tile` [can now render
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`image/webp`](https://github.com/openstreetmap/mod_tile/pull/318) and `go_tile`
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[can use it](https://github.com/nielsole/go_tile/pull/13).
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During the middle of all this I understood how my personal stack is unfit for
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the purpose of ad-hoc projects like this: if I put out something for the world
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to see, I want it to keep working for years. Serving the base tiles is just
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part of the problem, but already includes many more moving parts than I would
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like to maintain on my crumbling servers. So I decided to shelve this mapping
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project and spend some attention spans to "my infrastructure".
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Project 3a: home lab "infrastructure"
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------------------------------------
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As alluded in the previous section, the "home infrastructure" was not in a
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shape I would be happy to maintain long-term. If I start a project that I can
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show off, it needs to work for a long time with no or minimal maintenance.
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At the beginning of Summer I ran two Debian servers that needed to be upgraded.
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They have been configured by two thousand lines of Ansible YAMLs. I felt that
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writing the yamls were a necessary pain, so grinded it. It was so painful to
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configure stuff in Ansible that I wrote my own http server instead of using
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nginx; I wrote my own DNS server instead of using bind or nsd. And I was ready
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to write even more software from scratch, myself, just because it was so hard
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to configure out-of-the-box components with Ansible.
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In an unrelated conversation with my ex-colleague and good friend Ken Micklas,
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he suggested taking a more serious look into NixOS. I spent most of the
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summer's "computer time" understanding and dabbing at Nix. Boy it was a great
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decision. Time will tell, of course, for how long it was a maintainable one,
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but it shines pretty bright colors now.
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As of writing, I have the following on a small [Odroid H2+][oh2] computer in my
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closet:
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* This web server ([jakstys.lt][config-jakstys.lt]).
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* [Syncthing][config-syncthing] to synchronize documents, photos and podcasts
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between my laptop, phone and server.
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* [My code hosting instance][config-gitea], which is also a "single sign-on"
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provider. I authenticate to Headscale, Grafana and Gitea using it. I still
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have separate passwords for IRC and Matrix. IRC has no SSO for being IRC, and
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for Matrix it's ["on the roadmap"][oidc-matrix] for a while now.
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* [Home VPN for all my devices][config-headscale].
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* [Prometheus + Grafana][config-grafana], accessible only via the personal VPN.
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* [IRC bouncer][config-soju], so I can visit `#zig` on libera.chat.
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* [Matrix server][config-synapse], so I can still visit NixOS channels. Blog
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post about my declining usage of Matrix is coming soon.
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* [Automatic updates][config-deployerbot] with automatic rollbacks when
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upgrades fail.
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* DNS server. Here is the [zone config][config-dns] and the [server
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config][config-nsd]. This allows me to not use the "free" DNS providers (I
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have used one before, but had to move after a day-long outage). Having my own
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DNS server allows me to have letsencrypt certificates with [DNS
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verification][config-nsd-acme].
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* All on an encrypted root file system in ZFS, with nightly backups to
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rsync.net. The encrypted file system allowed me the liberty to add private
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data on the server: family photos, chat histories, later -- host a password
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manager for my family.
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DNS server is a reason why I run another server. The second server is an
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AArch64 virtual machine in Hetzner for €3.98/month which serves two purposes:
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1. The [DNS server][config-nsd-fra1].
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1. Remote [unlocking of the home machine's root
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partition][config-zfsunlock-fra1]. The servers keep trying to ping and
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unlock each other in case either of them reboots (hopefully not both at the
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same time).
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Why encrypted root partition at home? Because I don't want my family photos and
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personal documents unencrypted.
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Project 3b: home and vacation
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-----------------------------
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Originally I planned to take some time off and do all those projects. But after
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a couple of weeks it turned out that I am unfit for such a regime: the full day
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goes by and I do not feel like I have achieved more than I would normally have
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if I were employed.
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So at mid-August I started actively interviewing. It is ongoing now; I expect
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to have a job again sooner than I originally thought.
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I will keep you posted! Next -- Matrix.
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[calculator]: https://tools.geofabrik.de/calc/#type=geofabrik_standard&bbox=20.602031,53.844653,26.82,56.45
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[mod_tile]: https://github.com/openstreetmap/mod_tile
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[go_tile]: https://github.com/nielsole/go_tile
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[mapnik]: https://mapnik.org/
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[sycl2023]: https://softwareyoucanlove.ca/
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[marler]: https://github.com/marler8997/
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[oh2]: https://ameridroid.com/products/odroid-h2
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[config-headscale]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/modules/services/headscale/default.nix
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[config-jakstys.lt]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/vno1-oh2/configuration.nix#L189-L223
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[config-grafana]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/vno1-oh2/configuration.nix#L180-L185
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[config-soju]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/vno1-oh2/configuration.nix#L322-L332
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[config-synapse]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/modules/services/matrix-synapse/default.nix
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[config-deployerbot]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/modules/services/deployerbot/default.nix#L61-L68
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[config-gitea]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/modules/services/gitea/default.nix#L26-L68
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[oidc-matrix]: https://areweoidcyet.com/
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[config-dns]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/data.nix#L87-L118
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[config-nsd]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/vno1-oh2/configuration.nix#L314-L320
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[config-nsd-fra1]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/fra1-a/configuration.nix#L78-L84
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[config-zfsunlock-fra1]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/fra1-a/configuration.nix#L61-L73
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[config-nsd-acme]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/hosts/vno1-oh2/configuration.nix#L109-L119
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[config-syncthing]: https://git.jakstys.lt/motiejus/config/src/commit/97ef691743cc1b7014055aa47ab70ba7ee529b5f/modules/services/syncthing/default.nix#L35-L39
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