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I just updated our AWS Linux Server (which uses yum) and a new kernel is installed: kernel-4.1.10-16.27.amzn1.x86_64. It didn't state anything about restarting.
According to this answer here I should see a message that I need to restart:
What does this mean then? No need to reboot? Is this one of those kernels that don't need a restart?
Usually when you install something to Linux, the process only puts some files in several directories or if it is a module you can load it into the kernel without reboot, but if you install another kernel and you want to use it you need to restart and load it at boot time. If you are using grub you can choose between the two kernels installed.
uname -rto see what version of kernel you're currently running. If it isn't kernel-4.1.10-16.27.amzn1.x86_64 then you'll need a reboot to pick it up.kspliceinstalled/configured orkexec.ksplicewill not help with a completely different kernel version. ksplice or kgraft (nowadays this has been added directly in kernel) are meant for smaller security fixes or updates to certain modules, not an upgrade to a new major kernel version.kexecwould be the right thing, to load another kernel without rebooting.