Use crash to extract pre-analysis information in vmcore

I. Introduction

When the Linux kernel crashes or the server hangs, kdump (kernel crash dump: the kernel crash dump device) generates the vmcore file, and analyzes the vmcore information to determine the cause, crash is a widely used kernel crash dump file analysis tool, which requires the system to install the crash tool and kernel debugging tool kernel-debuginfo.

Ii. Tool installation and debugging

1. The version of the installation package must be consistent with that of the Linux kernel. view the Linux kernel version:

# Uname-

2. install, configure, and start kdump:

Install kdump:

Yum search kexec-Tools
Yum install kexec-tools.x86_64

Configure kdump:

Vim/boot/GRUB/menu. lst: Set crashkernel = auto

Vim/etc/kdump. conf: path/var/crash (directory generated by the Core File)

Start kdump:

Service kdump start

3. Install crash 

File Name: crash-6.1.0-5.el6.x86_64.rpm

Installation: Yum search crash

Yum install crash. x86_64

4. Install kernel-debuginfo

File Name: kernel-debuginfo-common-x86_64-2.6.32-220.el6.x86_64.rpm

Kernel-debuginfo-2.6.32-220.el6.x86_64.rpm

: Http://debuginfo.centos.org/6/x86_64/

Installation: rpm-IVH kernel-debuginfo-common-x86_64-2.6.32-220.el6.x86_64.rpm

Rpm-IVH kernel-debuginfo-2.6.32-220.el6.x86_64.rpm

Iii. Operations:

Refer:

Http://blog.csdn.net/guowenyan001/article/details/12975221

References:

In-depth exploration of kdump and crash:

Http://www.ibm.com/developerworks/cn/linux/l-cn-kdump4/index.html? CA = Drs

Crash debugging vmcore:

Http://blog.csdn.net/taget/article/details/7814740

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