this post was submitted on 02 Oct 2023
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there is live kernel patching, most distros (like Arch Linux) however don't set this up by default
there is also the possibility that one live patch don't work properly
the only reliable way currently to load the full new kernel is via reboot
the real way for server however is to not rely on one single server but have a redundant amount which you can reboot one at a time
Last time I tried replacing the kernel without a reboot it still reset the uptime. And it had about as long of a pause when replacing the kernel as a reboot had. So I don't see the benefit.