I need to enable Watchdog functionality on my RPi.
I've followed this guide: https://medium.com/@arslion/enabling-watchdog-on-raspberry-pi-b7e574dcba6b
No errors were reported, I installed everything was needed.
However I don't need to reset when CPU usage is high, I only need to reset when the system really freezes.
Therefore, I've only
watchdog-device = /dev/watchdog
watchdog-timeout=15
realtime = yes #was in by default
priority = 1 #was in by default
In /etc/watchdog.conf.
When I check the service, it seems running:
# systemctl status watchdog
● watchdog.service - watchdog daemon
Loaded: loaded (/lib/systemd/system/watchdog.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2021-04-05 19:17:24 CEST; 1h 28min ago
watchdog[674]: error retry time-out = 60 seconds
watchdog[674]: repair attempts = 1
watchdog[674]: alive=/dev/watchdog heartbeat=[none] to=root no_act=no force=no
watchdog[674]: watchdog now set to 15 seconds
watchdog[674]: hardware watchdog identity: Broadcom BCM2835 Watchdog timer
But as I don't have huge CPU usage trigger enabled, how can I make sure it's really active?
Is it enough to have watchdog linux service to be enabled and active?
I tried to do echo 1 > /dev/watchdog, nothing printed out, but after 15 seconds, RPi rebooted.
Do I have to echo constantly? Or the service is doing exactly this job for me?
