Is it possible to reboot a Linux OS without rebooting the hardware?

I use kexec-reboot on nearly all of my production systems.

It works incredibly well, allowing me to bypass the long POST time on HP ProLiant servers and reduce the boot cycle from 5 minutes to ~45 seconds.

See: https://github.com/error10/kexec-reboot

The only caveat is that it doesn’t seem to work on RHEL/CentOS 6.x systems booting UEFI. But most sane OS/hardware combinations work.

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