You should look at my PidFile - create and manage a PID file from the BEAM process thread, I have a systemd service description there that works well and I’ve been using for over a year now. You don’t need pid_file itself now as I think Distillery 2 baked in it’s functionality now, but check it’s docs to make sure (and to get the path to use). pid_file still works fine otherwise (I’m still using it). 
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