Educational Blogging

We’ll discuss the configuration of kdump on an Oracle Linux server .All steps and procedures explained and performed are based on Oracle Linux release 7 . What is kdump? Kdump is the crash dump mechanism of the Linux kernel which allows us to save the system memory contents for analysis . Oracle recommends that you enable the kdump feature as it helps Oracle Linux support to find the root cause whenever a server panics or crashes. To help identify the cause of the crash in case of a system failure, a memory image called the vmcore is created by kdump. An exclusive system memory portion will be requisite for kdump to be enabled. Being exclusive, this memory is not available for other purposes. Kdump utilizes kexec to boot to a second kernel whenever the system crashes. What is kexec? Kexec is a quick boot mechanism that allows the Linux kernel to boot from within a kernel context that is already running without going through the bootloader stage. ...