nixos: describe asxpio-services as a NixOS system
asxpio-services is to move from Debian with Docker to NixOS with Podman. This is the target system; nothing is switched over yet. One flake holds what was spread over cloud-init, Ansible roles and hand-made units: network and WireGuard, users and SSH restrictions, firewall, the weekly image prune, and the four container stacks (Paper and Fossils Minecraft, SillyTavern, the Forgejo runner), each as a systemd unit under Podman. The runner keeps running as a container and starts jobs through Podman's Docker-compatible socket. Secrets (WireGuard keys, RCON and CurseForge keys) are encrypted with sops for the admin's age key and the server's SSH host key, so the repository holds no plaintext secret and CI needs none of them. Containers that own data wait for /opt/.restored. On a freshly installed disk a game server would otherwise generate a new world exactly where the restore is about to land. Tried on a throwaway server (.#rehearsal): install with nixos-anywhere keeping a given host key, secret decryption, all stacks, a real Paper server stopping with a full save, what CI jobs need from the engine (short image names, the nix-store volume, service containers by name, a kaniko build, the socket inside a job), an update over SSH and a reboot. migration/ has the scripts that move the data through object storage, and a workflow builds the system on every push and switches the host on main. Assisted-by: Claude:fable-5-2
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185
nixos/hosts/asxpio-services/containers.nix
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185
nixos/hosts/asxpio-services/containers.nix
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# Containers run under Podman, one systemd unit each
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# (podman-<name>.service). Game data stays in /opt and is not managed here.
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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podman = lib.getExe pkgs.podman;
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# Time for a Minecraft server to save the world before it is killed
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stopTimeout = 120;
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# Nothing that owns data starts on a freshly installed disk: a game
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# server would generate a new world where the restore is about to land.
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# After restoring /opt, `touch /opt/.restored` and start the units.
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needsData.unitConfig.ConditionPathExists = "/opt/.restored";
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gameServer = needsData // {
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serviceConfig = {
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TimeoutStopSec = lib.mkForce (stopTimeout + 30);
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# A JVM stopped by SIGTERM exits 143 after saving; that is a clean stop
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SuccessExitStatus = [ 143 ];
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};
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};
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in
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{
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virtualisation.podman = {
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enable = true;
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dockerCompat = true; # `docker` runs podman
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dockerSocket.enable = true; # /run/docker.sock, used by the CI runner
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defaultNetwork.settings.dns_enabled = true;
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autoPrune = {
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enable = true;
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dates = "Mon 03:00";
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flags = [ "--all" ];
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};
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};
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virtualisation.containers.registries.search = [ "docker.io" ];
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virtualisation.oci-containers.backend = "podman";
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sops.secrets."minecraft_fossils/env" = { };
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virtualisation.oci-containers.containers = {
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# Paper server; the jar and the world live in /opt/minecraft
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minecraft = {
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image = "docker.io/library/eclipse-temurin:21-jre";
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workdir = "/data";
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cmd = [
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"java"
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"-Xmx4G"
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"-Xms2G"
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"-jar"
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"paper-1.21.11-54.jar"
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"nogui"
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];
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ports = [
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"25565:25565"
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"19132:19132/udp"
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];
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volumes = [ "/opt/minecraft:/data" ];
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extraOptions = [
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"--tty"
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"--interactive"
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"--stop-timeout=${toString stopTimeout}"
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];
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};
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minecraft-fossils = {
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image = "docker.io/itzg/minecraft-server:java21";
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environment = {
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EULA = "TRUE";
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TYPE = "FABRIC";
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VERSION = "1.20.1";
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FABRIC_LOADER_VERSION = "0.18.4";
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MEMORY = "8G";
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ONLINE_MODE = "FALSE";
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ENFORCE_WHITELIST = "TRUE";
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ENFORCE_SECURE_PROFILE = "FALSE";
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WHITELIST_FILE = "/data/whitelist.json";
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OPS_FILE = "/data/ops.json";
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ENABLE_RCON = "TRUE";
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MOTD = "[mc.czsk.dev] Fossils Archaeology Revival: Genesis";
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USE_AIKAR_FLAGS = "TRUE";
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};
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environmentFiles = [ config.sops.secrets."minecraft_fossils/env".path ];
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ports = [ "25566:25565" ];
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volumes = [ "/opt/minecraft-fossils/data:/data" ];
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extraOptions = [
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"--tty"
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"--interactive"
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"--network=fossils"
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"--stop-timeout=${toString stopTimeout}"
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];
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};
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# Copies whitelist, ops and ban lists from the Paper server
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minecraft-fossils-wlsync = {
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image = "docker.io/library/alpine:3";
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dependsOn = [ "minecraft-fossils" ];
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environment = {
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RCON_HOST = "minecraft-fossils";
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INTERVAL = "15";
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};
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environmentFiles = [ config.sops.secrets."minecraft_fossils/env".path ];
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volumes = [
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"/opt/minecraft:/src:ro"
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"/opt/minecraft-fossils/data:/dst"
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"${./wlsync.sh}:/wlsync.sh:ro"
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];
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cmd = [
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"sh"
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"/wlsync.sh"
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];
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extraOptions = [ "--network=fossils" ];
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};
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# Reachable on the WireGuard address only
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sillytavern = {
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image = "ghcr.io/sillytavern/sillytavern:1.19.0";
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ports = [ "10.20.0.20:8000:8000" ];
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volumes = [
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"/opt/sillytavern/config:/home/node/app/config"
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"/opt/sillytavern/data:/home/node/app/data"
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"/opt/sillytavern/plugins:/home/node/app/plugins"
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];
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};
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};
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systemd.services = {
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# Network shared by the Fossils server and its sidecar
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podman-network-fossils = {
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description = "Podman network fossils";
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wantedBy = [ "multi-user.target" ];
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before = [
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"podman-minecraft-fossils.service"
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"podman-minecraft-fossils-wlsync.service"
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];
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requiredBy = [
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"podman-minecraft-fossils.service"
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"podman-minecraft-fossils-wlsync.service"
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];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = "${podman} network exists fossils || ${podman} network create fossils";
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};
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podman-minecraft = gameServer;
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podman-minecraft-fossils = gameServer;
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podman-minecraft-fossils-wlsync = needsData;
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# The WireGuard address must exist before a port can be bound to it
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podman-sillytavern = needsData // {
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after = [ "wireguard-asxpio-services.service" ];
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requires = [ "wireguard-asxpio-services.service" ];
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};
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minecraft-fossils-restart = {
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description = "Daily restart of minecraft-fossils";
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serviceConfig.Type = "oneshot";
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script = "systemctl restart podman-minecraft-fossils.service";
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};
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};
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systemd.timers.minecraft-fossils-restart = {
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description = "Restart minecraft-fossils daily at 08:00 Europe/Tallinn";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = "*-*-* 08:00:00 Europe/Tallinn";
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Persistent = true;
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};
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};
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systemd.tmpfiles.rules = [
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"d /opt 0755 root root -"
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"d /opt/minecraft 0755 root root -"
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"d /opt/minecraft-fossils 0755 asxpi users -"
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"d /opt/minecraft-fossils/data 0755 asxpi users -"
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"d /opt/sillytavern/config 0755 root root -"
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"d /opt/sillytavern/data 0755 root root -"
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"d /opt/sillytavern/plugins 0755 root root -"
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];
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}
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