My Devuan Linux system is running with OpenRC init system, that's why I cannot user systemctl command. Instead of this, I'm calling init.d command and can start, stop, restart and get status information regarding all running services. For example, I've installed Apach2 server and I want to stop it. Then I run following command, stopping Apach2:
$ /etc/init.d/apache2 stop
[ ok ] Stopping Apache httpd web server: apache2.
It will stop Apache2 from running. We can check it this way:
$ /etc/init.d/apache2 status
/etc/init.d/apache2 status [FAIL] apache2 is not running ... failed!