comfilepi:enable_the_internal_watchdog_timer
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comfilepi:enable_the_internal_watchdog_timer [2023/06/19 09:16] COMFILE Technology |
comfilepi:enable_the_internal_watchdog_timer [2023/06/19 10:04] (current) COMFILE Technology |
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| ====== Enable the Internal Watchdog Timer ====== | ====== 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. | + | 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: | First, verify that the ///dev/watchdog// device exists: | ||
| Line 11: | Line 11: | ||
| </code> | </code> | ||
| - | Uncomment the following lines in the file ///etc/systemd/system.conf//: | + | 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> | <code> | ||
| RuntimeWatchdogSec=10 | RuntimeWatchdogSec=10 | ||
| - | ShutdownWatchdogSec=10min | + | RebootWatchdogSec=10min |
| </code> | </code> | ||
| - | Install the watchdog service with the following commands: | + | To test if the watchdog service is working, obtain root privileges, and then create a kernel panic with the following: |
| - | <code> | + | |
| - | sudo apt update | + | |
| - | sudo apt install watchdog | + | |
| - | </code> | + | |
| - | + | ||
| - | Check if the watchdog service is running with the following command: | + | |
| - | + | ||
| - | <code> | + | |
| - | pi@raspberrypi:~ $ systemctl | grep watchdog | + | |
| - | watchdog.service loaded active running watchdog daemon | + | |
| - | </code> | + | |
| - | + | ||
| - | If the //watchdog.service// is not running, start it with the following command: | + | |
| - | + | ||
| - | <code> | + | |
| - | sudo systemctl start watchdog.service | + | |
| - | </code> | + | |
| - | + | ||
| - | To test if the watchdog service is working, first, obtain root privileges and then initiate a [[https://en.wikipedia.org/wiki/Fork_bomb#Bash|forkbomb]]: | + | |
| <code> | <code> | ||
| pi@raspberrypi:~ $ sudo su | pi@raspberrypi:~ $ sudo su | ||
| - | root@raspberrypi:/home/pi# :(){ :|:& };: | + | pi@raspberrypi:~ $ echo 1 > /proc/sys/kernel/sysrq |
| + | pi@raspberrypi:~ $ echo "c" > /proc/sysrq-trigger | ||
| </code> | </code> | ||
comfilepi/enable_the_internal_watchdog_timer.1687133788.txt.gz · Last modified: 2023/06/19 09:16 by COMFILE Technology