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--- wireguard [2026/08/02 10:11] – baumi
+++ wireguard [2026/08/02 10:15] (current) – baumi
@@ Line 45: / Line 45: @@
 PrivateKey = <contents of privateB>
 ListenPort = 51820
-#If something needs to happen once tunnel is up or before tunnel goes down
+#If something needs to happen after tunnel is up or before tunnel goes down
 #PostUp = /usr/local/sbin/wg0-PostUp.sh
 #PreDown = /usr/local/sbin/wg0-PreDown.sh
@@ Line 94: / Line 94: @@
   persistent keepalive: every 25 seconds
 </code>
+===== Fallback systemd service to call PreDown script =====
+<code>
+root@hostb # cat << EOF > /etc/systemd/system/wg0-shutdown-fallback.service
+[Unit]
+Description=WireGuard wg0 shutdown fallback
+DefaultDependencies=no
+Before=shutdown.target reboot.target halt.target
+Before=wg-quick@wg0.service
+Conflicts=shutdown.target reboot.target halt.target
+After=local-fs.target
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/true
+ExecStop=/usr/local/sbin/wg0-PreDown.sh
+TimeoutStopSec=30
+[Install]
+WantedBy=multi-user.target
+EOF
+root@hostb # systemctl daemon-reload
+root@hostb # systemctl enable wg0-shutdown-fallback.service
+root@hostb # systemctl start wg0-shutdown-fallback.service
+</code>
 {{tag>kb linux}}