Kdump is a standard Linux mechanism to dump machine memory content on kernel crash. Kdump is based on Kexec. Kdump utilizes two kernels: system kernel and dump capture kernel. System kernel is a normal kernel that is booted with special kdump-specific flags.
kdump (Linux) – Wikipedia, Kdump – ArchWiki – Arch Linux, Documentation for Kdump – The kexec-based Crash Dumping …
Chapter 7. Kernel crash dump guide Red Hat Enterprise …
This is a script which configures kdump (kernel dump). Kdump provides a memory dump into a file named vmcore when the kernel has a critical issue. Vmcore is often required to investigate the issue. The crash dump is captured from the context of a freshly-booted kernel, not from the context of the crashed kernel.
kdump COMMAND: Kdump command is a crash recovery service. Kernel reserves a small amount of memory and it is used to find the exact cause of the crash. It is also called as a Linux kernel crash dumping mechanism.
7/18/2009 · Kdump is a new kernel crash dumping mechanism and is very reliable. The crash dump is captured from the context of a freshly booted kernel and not from the context of the crashed kernel. Kdump uses Kexec to boot into a second kernel whenever the system crashes.
Kdump uses kexec to quickly boot to a dump-capture kernel whenever a dump of the system kernel’s memory needs to be taken (for example, when the system panics). The system kernel’s memory image is preserved across the reboot and is accessible to the dump-capture kernel.
The kdump Crash Recovery Service. When the kdump crash dumping mechanism is enabled, the system is booted from the context of another kernel. This second kernel reserves a small amount of memory and its only purpose is to capture the core dump image in case the system crashes. Being able to analyze the core dump significantly helps to determine the …
