[fedora-arm] Re: Watchdog and raspberrypi

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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