Add mdproxy systemd service file

mdproxy.service

+[Unit]
+Description=MDProxy
+After=syslog.target network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/alternate-mdx
+ExecStart=/opt/alternate-mdx/bin/python -u mdproxy.py
+ExecReload=/bin/kill -HUP $MAINPID
+Restart=on-failure
+RestartSec=10
+SyslogIdentifier=mdproxy
+
+[Install]
+WantedBy=multi-user.target