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So, I am trying to have a Python server for the future Star Trek game run on port 1701 on my raspberry pi. Things work, but I run into issues where if I end the script (Ctrl Z) the port remains bound but the service isn't running. I would (preferably) like to set this server up in such a way that I can run it using:

python3 server.py start|stop|restart

I am open to other suggestions. What is the best way to do this?

Edit: Successfully resolved this using systemd.
I was going to say, use systemd: it's much better at this than you can be without a lot of work.

Perhaps you'd care to share what you did, though?
Well, what I did was fairly simple. I have the Python script in an arbitrary directory (in this case it's in /home/trek/server). I created a unit file in /lib/systemd/system that looks like this:


Description=Star Trek Server

ExecStart=/usr/bin/python3 /home/trek/server/setup.py


After that, you can use systemctl start|stop|status trekserv.service as root to interact with the daemon. I then realized it was still erroring, and after doing a bit more research, realized that you need a PID file, which systemd can access and remove but not create/modify, so I added this Python and then called it during the server's startup:


def writePidFile():
    pid = str(os.getpid())
    f = open('/var/run/trekserv.pid', 'w')

And now I can stop/start the server using the systemd syntax.
You may also wish to not run it as root, since that's generally good practice and everything appears to already be in a user's home directory.


You can also do away with the PID file completely; it's mostly only needed for services of Type=forking (traditional daemons) because the spawned daemon in that design can't be reliably followed; when you have Type=simple, it can always identify your PID because the service process is exactly the one that systemd starts.
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