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- Kexec abstract "In computing, kexec (coming from kernel execution, derived from the Unix/Linux kernel call exec) is a mechanism of the Linux kernel that allows "live" booting of a new kernel "over" the currently running kernel. Essentially, kexec skips the bootloader stage (hardware initialization phase by the system firmware, BIOS or UEFI) and directly loads the new kernel into memory, where it starts executing immediately. This avoids the long times associated with a full reboot, and can help systems to meet high-availability requirements by minimizing downtime.While feasible, implementing a mechanism such as kexec raises two major challenges: Memory of the currently running kernel is overwritten by the new kernel, while the old one is still executing. The new kernel will usually expect all physical devices to be in a well-defined state, as they are after a system reboot, when the BIOS, UEFI or system firmware resets them to a "sane" state. Bypassing a real reboot may leave devices in an unknown state, and the new kernel will have to recover from that.There are security concerns associated with the kexec mechanism, as basically anything can be loaded and executed that way, due to the fact that new kernel to be executed is not required to be signed. In other words, despite a robust in-kernel mechanism for ensuring that only signed Linux kernel modules can be inserted into the running kernel, root user can still load arbitrary code via kexec and execute it.".
- Kexec wikiPageExternalLink using-kdump-to-get-core-files-on-fedora-and-centos-hosts.
- Kexec wikiPageID "18345360".
- Kexec wikiPageRevisionID "585691257".
- Kexec hasPhotoCollection Kexec.
- Kexec subject Category:Linux_kernel_features.
- Kexec type Abstraction100002137.
- Kexec type Cognition100023271.
- Kexec type Concept105835747.
- Kexec type Content105809192.
- Kexec type Feature105849789.
- Kexec type Idea105833840.
- Kexec type LinuxKernelFeatures.
- Kexec type Property105849040.
- Kexec type PsychologicalFeature100023100.
- Kexec comment "In computing, kexec (coming from kernel execution, derived from the Unix/Linux kernel call exec) is a mechanism of the Linux kernel that allows "live" booting of a new kernel "over" the currently running kernel. Essentially, kexec skips the bootloader stage (hardware initialization phase by the system firmware, BIOS or UEFI) and directly loads the new kernel into memory, where it starts executing immediately.".
- Kexec label "Kexec".
- Kexec sameAs m.04dzbrv.
- Kexec sameAs Q6397983.
- Kexec sameAs Q6397983.
- Kexec sameAs Kexec.
- Kexec wasDerivedFrom Kexec?oldid=585691257.
- Kexec isPrimaryTopicOf Kexec.