I stole info from https://wiki.debian.org/systemd
Show system status:
$ systemctl status
List failed units:
$ systemctl –failed
# systemctl reset-failed
List installed unit files:
$ systemctl list-unit-files
List all running services:
$ systemctl
Activates the service “example1” immediately:
# systemctl start example1
Deactivates the service “example1” immediately:
# systemctl stop example1
Restarts the service “example1” immediately:
# systemctl restart example1
Shows status of the service “example1”:
# systemctl status example1
Enables “example1” to be started on bootup:
# systemctl enable example1
Disables “example1” to not start during bootup:
# systemctl disable example1