Upgrading the kernel on "fighting" servers?


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Hello gentlemen, I'm an aspiring linuxoid and this question I practically does not sleep — very interesting.

How is (if there is) the kernel update for "combat" serrah, where the thread in the data center from a hosting company guarantees uptime of 99.9%. After all, without a reboot of the machine as far as I know the new kernel does not move? So the kernel is not updated? What follows then is the closure of holes, which are detected with time in the kernel? Maybe there's something to read on the subject, and on highly loaded systems as a whole (in particular more theory to work with them are interested) or this level of secrets?
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If you are interested in technology kernel updates without rebooting, search by keyword ksplice.
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Why not updated? I'm here every year and a half, update the kernel and reboot doing well, or if some terrible vulnerability, then at the first opportunity, the night... the good issues in Debian/Ubuntu this is not.
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Either of the above-mentioned ksplice (but it doesn't always work), or the key word — HA-cluster. Updated a node at a time, without interruption of service.
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