Thanks Peter for your fast answer !
I was thinking about watchdog stack itself for the software part. I had
no idea that it was able to manage the HW watchdog of the RPI4 :)
the watchdog stack is a little confusing because the documentation is so
small...especially when using HW module already loaded !
Installation and configuration done, I will have to monitor now for
unexpected reboot ( instead of hanged nodes :) )
Thanks again
Fox
On 1/8/23 02:54, Peter Robinson wrote:
Hi Pierre-Francois,
I am running 6 RPI4s with fedora 37. K3S is powering this cluster and it
is working well :)
But from time to time, 1 RPI is randomly hanging.
I am thinking about implementing a watchdog :
- software based, using embeded linux kernel
If the RPi itself is locking up I'm not sure how a SW based approach
would work, how would it trigger if the kernel isn't working? Also not
sure what you mean here but "embeded linux kernel", care to explain
some more?
- hardware based such as https://www.omzlo.com/articles/the-piwatcher
The RPI4 already has a HW watchdog onboard, the driver is bcm2835_wdt,
maybe you could start by investigating the use of the Linux watchfog
stack with that. systemd has support for HW WDTs and we enable all the
pieces in Fedora already, I suspect that will be a good start for you.
Do you have any experience on one of theses two solutions ? Do you have
alternatives ?
By the way your job is fantastic and it is a great pleasure to be able
to run F37 on aarch64 so easily !
Thanks a lot
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