Re:Use This Kernel Parameter in Your Kiosk
by londons_explore on Saturday November 19, 2022 @07:50AM
(#33669632)
For network connected things (which aren't designed to work offline), I like to implement a network watchdog poker...
Ie. every 30 seconds, contact an update server server and, if successful, poke the hardware watchdog.
That means every device in your network will either be rebooting, or correctly talking to your server with the latest version of your software. There are no other stuck/error states to consider.
I also implement reboot-with-no-screen-flicker, so that I can display a basic company logo so things look respectable while there is an outage and everything is bootlooping. Some brands of screen let you upload an image to display if there is no valid signal, which is an easy way to implement this.
Also worth doing a load test of your server to verify that it can withstand all your devices rebooting simultaneously and you won't suffer the thundering herd problem.
Ie. every 30 seconds, contact an update server server and, if successful, poke the hardware watchdog.
That means every device in your network will either be rebooting, or correctly talking to your server with the latest version of your software. There are no other stuck/error states to consider.
I also implement reboot-with-no-screen-flicker, so that I can display a basic company logo so things look respectable while there is an outage and everything is bootlooping. Some brands of screen let you upload an image to display if there is no valid signal, which is an easy way to implement this.
Also worth doing a load test of your server to verify that it can withstand all your devices rebooting simultaneously and you won't suffer the thundering herd problem.