I know some people using this for applying kernel updates without rebooting, but don't know how good it is:

https://www.cloudlinux.com/all-products/product-overview/kernelcare



On 23 October 2016 at 09:16, nusenu <nusenu@openmailbox.org> wrote:
> Second, you will reduce the uptime and stability of
> your relay, thus it will lose consensus weight if you reboot the machine
> once a day.


Unattended-Upgrade::Automatic-Reboot "true";

Does not reboot your machine "once a day", it reboots when a new kernel
requires a reboot. Which on Debian stable / Ubuntu LTS is far from being
a daily event.
And the frequency of reboots actually should not differ compared to
manual reboots.


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