PidFile - create and manage a PID file from the BEAM process

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Also, if it helps, I use this overlay to generate (via distillary) a systemd service file using this PID library:

[Unit]
Description=<%= description %>
After=network.target

[Service]<% full_dir = Path.absname(output_dir)%>
Type=forking
User=<%= deploy_user %>
Group=<%= deploy_group %>
WorkingDirectory=<%= full_dir %>
ExecStart=<%= full_dir %>/bin/<%= p_name %> start
ExecReload=<%= full_dir %>/bin/<%= p_name %> reload_config
ExecStop=<%= full_dir %>/bin/<%= p_name %> stop
PIDFile=<%= full_dir %>/<%= p_name %>.prod.pid
Restart=always
RestartSec=5
Environment=PORT=3000
Environment=LANG=en_US.UTF-8
SyslogIdentifier=<%= p_name %>

[Install]
WantedBy=multi-user.target

Been using it in production ever since migrated the server from Windows 2008 to redhat, so a couple weeks now without issue. This follows the proper systemd model using a PID file with proper restarts (tested it by manually telling the server to stop, killing it, kill -9’ing it, comes back up in 5 seconds every time).

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