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--- products:sbc:vim1s:applications:watchdog [2022/08/21 22:52]
frank
+++ products:sbc:vim1s:applications:watchdog [2022/08/21 23:37] (current)
frank [Test Watchdog]
@@ Line 4: / Line 4: @@
 ===== Introduction =====
-This page introduces the internal Watchdog. You will learn how to enable the watchdog and test it.
+This page introduces the external Watchdog. You will learn how to enable the watchdog and test it.
 ===== Enable Watchdog =====
+Watchdog is disabled by default, use the commands below to enable it.
+```shell
+khadas@Khadas:~$ sudo systemctl start external-watchdog.service
+```
+Check watchdog status:
+```shell
+khadas@Khadas:~$ systemctl status external-watchdog.service
+● external-watchdog.service - External Watchdog
+     Loaded: loaded (/lib/systemd/system/external-watchdog.service; static)
+     Active: active (running) since Mon 2022-08-22 11:19:31 CST; 1min 3s ago
+   Main PID: 2766 (external-watchd)
+      Tasks: 2 (limit: 1592)
+     Memory: 1.5M
+        CPU: 1.176s
+     CGroup: /system.slice/external-watchdog.service
+             ├─2766 /bin/bash /usr/local/bin/external-watchdog.sh start
+             └─3157 sleep 0.5
+```
 ===== Test Watchdog =====
+You can also kill the watchdog daemon to prevent an automatic restart.
+```shell
+khadas@Khadas:~$ ps -axu | grep external-watchdog
+root        2766  0.4  0.1   6876  3316 ?        Ss   11:19   0:01 /bin/bash /usr/local/bin/external-watchdog.sh start
+```
+Process ID with watchdog daemon is ''2766''.
+```shell
+khadas@Khadas:~$ sudo kill -9 2766
+```
+the system will automatically reboot.
 ===== Disable Watchdog =====
+```shell
+khadas@Khadas:~$ sudo systemctl disable external-watchdog.service
+```

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