systemd service definitions sometimes fail silently
Today I've added a systemd service definition, but it didn't show up as a
service when running systemctl list-units. I took me a while to figure out
how to ask systemd if there's anything wrong with my .service file. The
easiest way to get infos about broken service files I could find is to run:
systemd-analyze verify my.service
If that doesn't work, make sure the file is in the correct path.
(/etc/systemd/system/*.service) Once all typos/bugs/etc. are fixed don't
forget to run systemctl daemon-reload to make sure systemd is aware of the
new unit.