On Wed, Aug 17, 2011 at 3:04 PM, amit mehta <gmate.amit@xxxxxxxxx> wrote:
I've a Linux box which is crashing under a particular test scenario.
To debug this issue I was thinking of using the crash (man 8 crash)
utility (available by default on recent releases of RHEL and SuSE) .
This tool requires the kernel crash dump (vmcore) and the debugging symbols.
On my machine, I don't see any crash under /var/crash, Hence please
let me know the
configuration changes which i need to do to enable my machine to dump
the kernel image
locally (do i need to apply diskdump patches and rebuild the kernel??) whenever
there is a kernel crash. Kdump seem to be another tool for this job
but that requires a lot of
setup. Is there a *shortcut* to enable kernel crash dump facility ?
The debugging symbols can be found here:
http://ftp.riken.go.jp/Linux/slc/slc6X/updates/x86_64/debug/
http://ftp.riken.go.jp/Linux/slc/slc6X/updates/i386/debug/
You need to configure kdump on your RHEL system to enable it to dump the vmcore file when the panic happens... Kdump configuration is explained below.. There is a crashkernel boot parameter to be passed to kernel to specify the memory reserved for the crash kernel.
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/ch-kdump.html
http://www.mindtwist.de/main/linux/11-red-hat/27-how-to-configure-kernel-dumps-on-rhel-5.html
http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=/liaai/crashdump/liaaicrashdumpconfigkdump.htm
Thanks and Regards,
Sumeet
-Amit
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