Systemd services command cheatsheet

List of all services and their status:

service --status-all

Another way:

systemctl list-units --type service --all  

List just the enabled services 

systemctl list-units --type service   

or systemctl -l –type service –all

Stop/Start/Restart a service 

systemctl restart/start yourservicename

Enable/Disable the startup of a service at boot time

systemctl enable/disable yourservicename 

Is it enabled? 

systemctl is-enabled yourservicename

Uninstall/wipe a service 

rm /etc/systemd/system/yourservicename

systemctl daemon-reload

systemctl reset-failed

Find out the dependencies: 

systemctl list-dependencies --type service

Get the files related to the service:

locate yourservicename.service 

Disable the service and forbids the others from start it

systemctl mask yourservicename

list systemd unit files and their states (enabled/disabled/etc)

systemctl list-unit-files 

To see / set the default runlevel of the system

systemctl get-defaults (set-defaults)

e.g. multi-user.target or graphical.target




systemctl isolate 

explained: (stolen from internet)

The word "isolate" means run the requested unit, and make sure nothing else is running (with a few exceptions.) Since runlevels have been replaced by targets (which are more or less just a set of services that you want to be running in a certain situation, like for multi-user or graphical usage), you can switch to a "runlevel" by starting the equivalent target and stopping anything that is not part of the new target - using isolate.
systemctl isolate multi-user.target is the modern way to unload the graphic shell, which was done by init 3 previously.   You are in runlevel 5 or to be precise in graphical.target. You do runlevel 3 or systemctl isolate multiuser.target.

Another way to change target runlevel.

systemctl set-default multi-user.target (then reboot)