Kexec: Difference between revisions
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[https://en.wikipedia.org/wiki/Kexec Kexec] is a system call that enables loading and booting into another kernel. This is useful for fast reboots that skip the BIOS or UEFI initialisation process. | [https://en.wikipedia.org/wiki/Kexec Kexec] is a system call that enables loading and booting into another kernel. This is useful for fast reboots that skip the BIOS or UEFI initialisation process. | ||
==Installing kexec-tools== | |||
The userspace tools required to use it can be installed via {{cmd|apk add {{pkg|kexec-tools}}}} The tools are not available on all flavors of Alpine, additionally not all kernels are compiled with the kexec syscall enabled. You will most likely want to check your {{path|/boot/config-*}} file for {{codeline|CONFIG_KEXEC=y}} | |||
==Usage== | |||
On a typical Alpine setup, it can be used via: | On a typical Alpine setup, it can be used via: | ||
Revision as of 18:26, 13 August 2023
Kexec is a system call that enables loading and booting into another kernel. This is useful for fast reboots that skip the BIOS or UEFI initialisation process.
Installing kexec-tools
The userspace tools required to use it can be installed via
apk add kexec-tools
The tools are not available on all flavors of Alpine, additionally not all kernels are compiled with the kexec syscall enabled. You will most likely want to check your /boot/config-* file for CONFIG_KEXEC=y
Usage
On a typical Alpine setup, it can be used via:
# kexec -l /boot/vmlinuz-edge --initrd \ /boot/initramfs-edge --reuse-cmdline # kexec -e
kexec -e does not unmount any filesystems or gracefully shut down any services!
There are no Alpine-specific considerations for Kexec. Please review the man page and existing references below of more details. This page is deliberately kept short in order to avoid duplicating existing documentation.