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this post was submitted on 22 Feb 2024
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Check if your motherboard has a watchdog function. If the OS can't ping the watchdog every 5 min or whatever you set it to, the board resets.
This is how we handled camera servers at one of my former jobs, we just setup HP SFF desktops with Windows and the software and turned on the watchdog timer, always did the trick when power outages or system hangups happened.
There's a tale from long ago where someone set up a CD drive tray so that opening it would tap the reset button on a server.
Nice
https://thedailywtf.com/articles/itappmonrobot
Awesome, thanks for the link
Awesome, thanks for the link
Thanks, I've got a HP SFF as well. Not 100% sure how to turn it on though from Ubuntu. There's a software based version: https://manpages.ubuntu.com/manpages/xenial/en/man8/watchdog.8.html
But I guess that's not the one using the motherboard watchdog function.
You can set it in the BIOS, regardless of OS.
You need an OS app to run and a setting in the BIOS. The app at the OS level gives a heartbeat to the watchdog module on the mother board. If you miss some heartbeats, the firmware on the motherboard sends the reset command.
This is how you lose data. Hope you have a good backup on a NAS?
No, this is a tool that can be used in a well designed architecture. Would I do this with a single database server, probably not. Would I ever run a single database server? Also probably not.
Also, by this point, you've probably already kernel panicked or something. There's not much left that can be saved and you probably needed that backup five minutes before the host came up.
Thanks! That should work.