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I've always wondered what something like CoreOS uses to "switch" kernels in a live system - is that also something like ksplice or a different technology?
by atonse 12y ago
I've always wondered what something like CoreOS uses to "switch" kernels in a live system - is that also something like ksplice or a different technology?
- deleted 12y ago[deleted]
- rckclmbr 12y agoHow do you mean? I thought CoreOS required reboot https://coreos.com/docs/cluster-management/setup/update-strategies/ https://coreos.com/docs/cluster-management/setup/update-stra...
- Titanous 12y agoI believe that CoreOS can use kexec to update the kernel. kexec basically looks the same as a reboot except instead of stopping fully, and going through the BIOS/bootloader again (which can take a long time on server-grade hardware), the old kernel 'execs' the new kernel and boots userspace back up. https://en.wikipedia.org/wiki/Kexec https://en.wikipedia.org/wiki/Kexec