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Ksplice: kernel patches without rebootsKsplice: kernel patches without rebootsPosted Apr 30, 2008 3:11 UTC (Wed) by joey (subscriber, #328)Parent article: Ksplice: kernel patches without reboots
One use case I can see is large xen hosting providers. Upgrading the domU kernels is a real pain for such providers, because just rebooting all the user's machines won't work; a certian number will fail to come up, users will hate you. Instead, a good hosting provider will let the user choose when to reboot into a fixed kernel. But then some percentage of users never will, and instead get cracked. So I can see hotpatching the kernel being really appealing in that situation, even if it's annoying to manage. (Personally, I'd rather my xen hosting provider just let me build and run my *own* kernel. But that's just me.)
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Foolish, not good Posted Apr 30, 2008 4:33 UTC (Wed) by khim (subscriber, #9252) [Link] Instead, a good hosting provider will let the user choose when to reboot into a fixed kernel. Why? Xen long had a way to solve this problem: live migration. When and how user updates kernel in VPS installation is another question...
Foolish, not good Posted Apr 30, 2008 6:51 UTC (Wed) by joey (subscriber, #328) [Link] Live migration to a different version of the kernel? I thought that xen's migration was of a whole domU, including kernel.
Foolish, not good Posted May 1, 2008 13:20 UTC (Thu) by BenHutchings (subscriber, #37955) [Link] You are correct. khim is probably thinking of what you do when dom0's kernel needs to be patched.
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