Nix Cookbook: Difference between revisions

@@ Line 15: / Line 15: @@
 in {
    environment.systemPackages = [ helloWorld ];
+}
+</syntaxHighlight>
+=== Creating Periodic Services ===
+Using the [https://nixos.org/nixos/manual/#sec-systemctl systemd support] periodic services can be defined. In this case a service named <code>simple-timer</code> writes out the current time to <code>/tmp/simple-timer.log</code> every minute.
+<syntaxHighlight lang="nix>
+{ pkgs, ... }:
+{
+  systemd = {
+    timers.simple-timer = {
+      wantedBy = [ "timers.target" ];
+      partOf = [ "simple-timer.service" ];
+      timerConfig.OnCalendar = "minutely";
+    };
+    services.simple-timer = {
+      serviceConfig.Type = "oneshot";
+      script = ''
+        echo "Time: $(date)." >> /tmp/simple-timer.log
+        chmod +r /tmp/simple-timer.log
+      '';
+    };
+  };
 }
 </syntaxHighlight>