> Turns out in 21st century you can even update [Raspberry Pi] without downtime.

Hopefully I didn't just miss it in the article, but... how?

Kernel care is apparently free for the raspberry Pi

https://tuxcare.com/patch-raspberry-pi-systems-without-a-reb...

Also I think you can use Ubuntu PRO on the pi, which includes Livepatch.

I'm only seeing a long and posing as an article telling me to sign up for a 7 day trial.

All Linux kernel livepatch stuff are paid services, as I understand it, the Linux kernel live patches aren't possible to just produce automatically, it requires a team with enough Linux kernel knowledge to make it work and usually such teams want to get paid.

Also, I think that the base Linux kpatch tools are open source, but the infrastructure that RedHat/SUSE/Canonical/etc use to provide them are not. However, I think the Gentoo folks do have some open infra code.

https://github.com/dynup/kpatch https://wiki.gentoo.org/wiki/Elivepatch https://wiki.gentoo.org/wiki/Live_patching https://github.com/gentoo/elivepatch-server https://github.com/gentoo/elivepatch-client