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Seamless Kernel Update

Talkat FOSDEM 2022 · on Sunday, 2022-02-06· at 10:00· M.security· [linux-and-operating-systems, devops-and-delivery]

speaker

name:Longjun Luo
links:none on file

resources

video:https://video.fosdem.org/2022/M.security/security_seamless_kernel.mp4
slides:https://fosdem.org/2022/schedule/event/security_seamless_kernel/attachments/slides/5061/export/events/attachments/security_seamless_kernel/slides/5061/Seamless_Kernel_Update.pdf

summary

Describes a workflow for updating the Linux kernel without full downtime by combining kexec to boot a new kernel and CRIU (Checkpoint/Restore In Userspace) to checkpoint and restore running applications. Focuses on using checkpoint-and-restore to save application state, perform a fast kernel switch, and then restore processes to minimize interruption where live-patch cannot be applied.

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