This is how to stop a running service temporarily:
# systemctl stop servicename.service
This stops it from starting at boot, but does not stop a running service:
# systemctl disable servicename.service
That also prevents it from being started by anything else, such as plugging in some hardware, or by socket or bus activation
There is one way to stop a service for good without uninstalling it, and that is by linking it to /dev/null:
# ln -s /dev/null /etc/systemd/system/servicename.service # systemctl daemon-reload
When you want it back:
delete the symlink to /dev/null and run systemctl enable servicename.service
