Reliable persistent SSH-Tunnel via systemd (not autossh)

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# Reliable persistent SSH-Tunnel via systemd (not autossh)
# https://gist.github.com/aslafy-z/24e2ddb02fa269444620eab1bcfe2932#file-serveo-tunnel-service
#
# Usage: systemctl start serveo-tunnel@[tunnel-string] (see https://serveo.net for details) 
#   systemctl start serveo-tunnel@mytunnel:80:localhost:8080
#   systemctl enable serveo-tunnel@mytunnel:80:localhost:8080 (to make it persist reboot)

[Unit]
Description=Serveo tunnel for %i
After=network.target

[Service]
User=root
ExecStart=/usr/bin/ssh -o "ExitOnForwardFailure yes" -o "ServerAliveInterval 60" -R %i serveo.net
Restart=always
RestartSec=5s
StartLimitInterval=0

[Install]
WantedBy=multi-user.target