Has anyone used Cannonical's Live Patch before?

Livepatch is free for up to 3 accounts. It downloads and installs updates automatically which is cool, but there are already tools to do this such as unattended-upgrades . Does Live Patch offer any additional functionality?

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Yes, no reboot kernel updates.

Interesting, but you still would possibly need to reboot for other packages?

In Fedora (and I assume CentOS 8), dnf needs-restarting can show which services need to be restarted post update.

https://dnf-plugins-core.readthedocs.io/en/latest/needs_restarting.html

Yeah automatic-upgrades is the Ubuntu version of dnf-automatic

Have you actually used it?

No, we have more then 3 machines.