December 2015
Intermediate to advanced
250 pages
4h 41m
English
Content preview from Red Hat Enterprise Linux Server CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using kdump and SysRq
The kdump mechanism is a Linux kernel feature, which allows you to create dumps if your kernel crashes. It produces an exact copy of the memory, which can be analyzed for the root cause of the crash.
SysRq is a feature supported by the Linux kernel, which allows you to send key combinations to it even when your system becomes unresponsive.
How to do it…
First, we'll set up kdump and SysRq, and afterwards, I'll show you how to use it to debug a dump.
Installing and configuring kdump and SysRq
Let's take a look at how this is installed and configured:
- Install the necessary packages for kdump by executing the following command:
~]# yum install -y kexec-tools - Ensure that
crashkernel=autois present in theGRUB_CMDLINE_LINUXvariable ...
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