even more backups of things

hosts/lithium/microvms/valheim.nix

@@ -0,0 +1,50 @@
+{ config, lib, pkgs, ... }:
+{
+  microvm.vms.valheim  = {
+    autoStart = true;
+    memorySize = 4096;
+    vcpu = 2;
+
+    forwardPorts = [
+      { from = "host"; hostPort = 2456; guestPort = 2456; proto = "udp"; }
+      { from = "host"; hostPort = 2457; guestPort = 2457; proto = "udp"; }
+    ];
+
+    # NOTE: For games with large save files, choose a path in "/tank" for
+    # storage.
+    sharedDirectories = [
+      {
+        hostPath = "/srv/game-data-valheim";
+        guestPath = "/data";
+        tag = "valheim-data";
+        readOnly = false;
+      }
+    ];
+
+    packages = [ pkgs.steamcmd pkgs.steam-run ];
+
+    users.users.valheim = {
+      isNormalUser = true;
+      home = "/home/valheim";
+      extraGroups = [ "wheel" ];
+    };
+
+    systemd.services.valheim = {
+      description = "Valheim Dedicated Server";
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        workingDirectory = "/data";
+        ExecStart = ''
+          ${pkgs.steam-run}/bin/steam-run ./valheim_server.x86_64 \
+            -name "Valheim NixOS" \
+            -port 2456 \
+            -world "FlatEarth" \
+            -password "secret" \
+            -public 1
+        '';
+        Restart = "always";
+        User = "valheim";
+      };
+    };
+  };
+}