systemd rocks! I really did not think I had the patience to learn it, but now I understand it and have played about with it, I think it is brilliant if not for one reason alone - creating service files are trivial, which is how it should be. In SysVInit I rarely bothered.
Here's one I knocked up for icecast. There was already a rc script for it running under under systemd but I decided to create my own systemd service file as a test. To install was was simply a matter of:-
systemctl stop icecast.service
systemctl disable icecast.service
cp icecast.service /lib/systemd/system/icecast.service,
and then activating it again with systemctl enable icecast.service
systemd realised it had a service file for it and uses that rather that the installed /etc/rc.d/icecast file which I could leave installed. I'm impressed.
Here's the icecast.service file I created. I had to uncomment the pid file option in icecast.xml. I also changed the path to /var/run
[Unit]] Description=Icecast 2.x Server] [Service] ExecStart=/usr/bin/icecast -b -c /etc/icecast.xml Type=forking PIDFile=/var/run/icecast.pid [Install] WantedBy=multi-user.target]