“Seamless” kernel update with CRIU & Kexec

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Presentation transcript:

“Seamless” kernel update with CRIU & Kexec Pavel Emelyanov Linux Plumbers, Düsseldorf, Germany, 2014 1

How (simple case) Stop tasks that need to survive Dump their state as a set of image files Change kernel with Kexec Restore tasks from image files

How (speeding up) Stop tasks that need to survive Dump their state as a set of image files Keep memory in memory Keep image files in memfs Collect PFNs with data Change kernel with Kexec Get back memory with data Restore tasks from image files

Known problems Downtime is very sensitive to IO & dirty set (can't reboot with dirty memory) Amount of disk reads (e.g. open()-s) on restore Need to protect mem with images from booting kernel Subject to all issues kexec is (e.g. not all HW is supported)