First version

files/firewall.service

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+[Unit]
+Description=Contest firewall
+Wants=network-online.target contest-proxy.service contest-dns.service
+After=network.target network-online.target
+Before=getty.target getty@tty1.service
+
+[Service]
+Type=oneshot
+ExecStart=/firewall.sh
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target