heather: replace k3s with docker+arion+caddy+syncthing
- remove k3s.nix (1.3GB overhead unjustified for single-node) - add docker.nix (docker + arion CLI, mikl in docker group) - add caddy.nix (edge proxy, TLS via ACME staging, host-based routing) - add syncthing.nix (sync daemon + strelaysrv via systemd, /srv/syncthing) - add arion-compose.nix (forgejo first, others stubbed as TODO) - add arion flake input + nixos module - default.nix: wire up arion project as systemd service (serviceName=heather) Architecture: Caddy (host) terminates TLS, routes to host services (syncthing) and docker containers (arion, 127.0.0.1:PORT). Named volumes everywhere except silverbullet (bind /srv/syncthing/herbarium).
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hosts/heather/docker.nix
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hosts/heather/docker.nix
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# heather — docker + arion (nix-native docker-compose)
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#
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# Заменило k3s (2026-07-12): k3s сжирал 1.3 GB (16% от 8 GB) на single-node
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# без реальной выгоды. docker+arion даёт ~100 MB overhead и знакомую модель.
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# Caddy на хосте терминирует TLS (см. ./caddy.nix), Traefik/ServiceLB не нужны.
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#
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# Arion: читает arion-compose.nix (nix-выражение), генерирует docker-compose,
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# запускает как systemd-сервис через virtualisation.arion.projects.
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# Контейнеры описаны в ./arion-compose.nix.
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{ pkgs, ... }:
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{
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virtualisation.docker = {
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enable = true;
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# Хост-docker (не rootless): mikl в группе docker для `docker` CLI без sudo.
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# arion-проект запускается от root через systemd (см. ниже).
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};
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# Arion: nix-native docker-compose. backend задаётся в default.nix
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# (virtualisation.arion.backend = "docker"), проект — там же.
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# mikl может управлять docker без sudo (docker group).
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users.users.mikl.extraGroups = [ "docker" ];
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environment.systemPackages = with pkgs; [
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docker-compose
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arion
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];
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}
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