Create SYSTEMD.MD

docs/SYSTEMD.MD

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+## Setting up P2Pool as a systemd service (Linux)
+
+With this config, P2Pool will run as a service with redirected I/O. It uses `p2pool` user which you should setup beforehand.
+
+You can execute console commands by running `echo "status" > /run/p2pool/p2pool.control`
+
+### p2pool.service
+```
+[Unit]
+Description=p2pool daemon
+After=network-online.target systemd-modules-load.service monerod.service
+Wants=network-online.target systemd-modules-load.service monerod.service
+Requires=p2pool.socket
+
+[Service]
+Type=exec
+Sockets=p2pool.socket
+StandardInput=socket
+StandardOutput=journal
+StandardError=journal
+
+# /usr/local/bin/p2pool.sh simply invokes the p2pool executable with your chosen command-line options. 
+ExecStart=/usr/local/bin/p2pool.sh
+TimeoutStopSec=60
+
+# Run as p2pool:p2pool
+User=p2pool
+Group=p2pool
+
+WorkingDirectory=/var/lib/p2pool
+
+[Install]
+WantedBy=multi-user.target
+```
+
+### p2pool.socket
+```
+# FIFO socket for controlling p2pool daemon
+[Unit]
+Description=Command FIFO for p2pool daemon
+
+[Socket]
+ListenFIFO=/run/p2pool/p2pool.control
+DirectoryMode=0755
+SocketMode=0666
+SocketUser=p2pool
+SocketGroup=p2pool
+RemoveOnStop=true
+```