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diff --git a/Urbit/Harbor.nix b/Urbit/Harbor.nix
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--- /dev/null
+++ b/Urbit/Harbor.nix
@@ -0,0 +1,98 @@
+{ options
+, lib
+, config
+, pkgs
+, ...
+}:
+
+/*
+
+Urbit Harbor is a supervisor for Urbit ships on the local machine. It does no
+orchestration, it just manages systemd services.
+
+Setup process:
+
+    <running as user "urbit-harbor">
+    dir=/var/urbit/harbor
+    urbit -c $dir/zod -k $dir/zod.key -x          # one-time setup
+    <create $dir/zod.service from some template>
+    systemctl --user enable $dir/zod.service      # nees fullpath
+    systemctl --user start zod.service
+
+
+Service Template:
+
+    [Service]
+    ExecStart=urbit -tq /var/urbit/harbor/zod  # maybe want -d?
+    ExecStartPre=mkdir -p /var/urbit/harbor/zod
+
+    [Unit]
+    Description=zod
+
+    [Install]
+    WantedBy=multi-user.target
+
+
+TODO:
+    - use systemd.resource-control to limit memory/CPU for ships
+      - Urbit.Cloud controller will set different limits by reading/editing the
+      ini file, and change price to customer
+    - figure out what firewall stuff i need to do
+*/
+
+let
+  cfg = config.services.urbit-harbor;
+in {
+  options.services.urbitharbor = {
+    enable = lib.mkEnableOption "Enable urbit-harbor";
+
+    dataDir = lib.mkOption {
+      type = lib.types.path;
+      default = "/var/urbit/harbor";
+      description = "Where to store piers";
+    };
+
+    ships = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      description = "List of @p's to start up, without the leading ~";
+    };
+
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.urbit-harbor;
+      description = "The urbit-harbor package to use";
+    };
+
+    urbitPackage = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.urbit;
+      description = "The urbit package to use";
+    };
+
+    user = lib.mkOption {
+      type = lib.types.user;
+      default = "urbit-harbor";
+      description = "User to run as";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.urbit-harbor = {
+      path = [ cfg.package cfg.urbitPackage ];
+      wantedBy = [ "multi-user.target" ];
+      preStart = ''
+        mkdir -p ${cfg.dataDir}
+      '';
+      script = "${cfg.package}/bin/urbit-harbor ${cfg.dataDir}";
+      description = "Urbit harbor";
+      serviceConfig = {
+        User = cfg.user;
+        Type = "simple";
+        Restart = "always";
+        RestartSec = "3";
+      };
+    };
+
+  };
+
+}