Merge pull request #492 from Devices/patch-1

systemd timer as option for background service

admin_manual/configuration_server/background_jobs_configuration.rst

@@ -83,3 +83,46 @@ You can verify if the cron job has been added and scheduled by executing::
 .. note:: Please refer to the crontab man page for the exact command syntax.
 
 .. _easyCron: http://www.easycron.com/
+
+systemd
+~~~~~~~
+
+If systemd is installed on the system, a systemd timer could be an alternative to a cronjob.
+
+This approach requires two files: **nextcloudcron.service** and **nextcloudcron.timer**. Create these two files in ``/etc/systemd/system/``.
+
+**nextcloudcron.service** should look like this::
+
+  [Unit]
+  Description=Nextcloud cron.php job
+  
+  [Service]
+  User=www-data
+  ExecStart=/usr/bin/php -f /var/www/nextcloud/cron.php            
+  
+  [Install]
+  WantedBy=basic.target
+
+Replace the user ``www-data`` with the user of your http server and ``/var/www/nextcloud/cron.php`` with the location of **cron.php** in your nextcloud directory.
+
+**nextcloudcron.timer** should look like this::
+
+  [Unit]
+  Description=Run Nextcloud cron.php every 15 minutes
+  
+  [Timer]
+  OnBootSec=5min
+  OnUnitActiveSec=15min
+  Unit=nextcloudcron.service
+  
+  [Install]
+  WantedBy=timers.target
+
+The important parts in the timer-unit are ``OnBootSec`` and ``OnUnitActiveSec``.``OnBootSec`` will start the timer 5 minutes after boot, otherwise you would have to start it manually after every boot. ``OnUnitActiveSec`` will set a 15 minute timer after the service-unit was last activated.
+
+Now all that is left is to start and enable the timer by running these commands::
+
+  systemctl start nextcloudcron.timer
+  systemctl enable nextcloudcron.timer
+
+.. note:: Select the option ``Cron`` in the admin menu for background jobs. if left on ``AJAX`` it would execute the AJAX job on every page load.