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--- comfilepi:enable_the_internal_watchdog_timer [2022/07/08 06:38]
COMFILE Technology
+++ comfilepi:enable_the_internal_watchdog_timer [2023/06/19 10:04]
COMFILE Technology
@@ Line 1: / Line 1: @@
+====== Enable the Internal Watchdog Timer ======
+The ComfilePi's [[https://en.wikipedia.org/wiki/System_on_a_chip|SoC]] has an internal watchdog timer that can be used to automatically reboot the system should it ever become unresponsive.  It is also recommended to [[::comfilepi:read-only_file_system_with_overlay|enable the read-only file system overly]] to protect the file system from corruption should such an event occur.
+First, verify that the ///dev/watchdog// device exists:
+<code>
+pi@raspberrypi:~ $ ls -al /dev/watchdog*
+crw------- 1 root root  10, 130 Feb 14  2019 /dev/watchdog
+crw------- 1 root root 251,   0 Feb 14  2019 /dev/watchdog0
+</code>
+Uncomment the following lines in the file ///etc/systemd/system.conf// and then reboot.  See [[https://manpages.debian.org/bullseye/systemd/systemd-system.conf.5.en.html | the system.conf documentation]] for more information about these settings:
+<code>
+RuntimeWatchdogSec=10
+RebootWatchdogSec=10min
+</code>
+To test if the watchdog service is working, obtain root privileges, and then create a kernel panic with the following:
+<code>
+pi@raspberrypi:~ $ sudo su
+pi@raspberrypi:~ $ echo 1 > /proc/sys/kernel/sysrq
+pi@raspberrypi:~ $ echo "c" > /proc/sysrq-trigger
+</code>
+If the watchdog is working, then after about 10 to 20 seconds the ComfilePi should reboot.
+[[comfilepi:index|ComfilePi - Industrial Raspberry Pi Panel PC]]

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