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 >> >> _______________________________________________ >> arm mailing list -- arm(a)lists.fedoraproject.org >> To unsubscribe send an email to arm-leave(a)lists.fedoraproject.org >> Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ >> List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines >> List Archives: https://lists.fedoraproject.org/archives/list/arm@lists.fedoraproject.org >> Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue