Update installation-macos-pkg.md

installation-macos-pkg.md

@@ -27,3 +27,17 @@ sudo installer -pkg /path/to/yggdrasil-xxx-macos.pkg -target /
 Once completed, the Yggdrasil configuration will have automatically been
 generated, the `launchd` service will have been installed and the service will
 be running.
+
+## Managing the Yggdrasil service
+
+Yggdrasil runs under `launchd` so it will run automatically at startup and will restart if the process is killed.
+
+To stop the service or prevent it from starting automatically, use `launchctl` to unload the service:
+```
+sudo launchctl unload /Library/LaunchDaemons/yggdrasil.plist
+```
+
+To start it again, load the service:
+```
+sudo launchctl load /Library/LaunchDaemons/yggdrasil.plist
+```