Ubuntu 12.04 configuration kernel crash Auto restart and dump

The default ubuntu12.04 does not configure the kernel crash to automatically restart and dump, resulting in a kernel crash, there is no core dump file to analyze, and stuck in the kernel crash interface, in order to facilitate the search for kernel crash reasons, need to be the kernel crash automatic restart configuration and kernel dump configuration, The configuration steps are as follows:

First step configure kernel crash auto restart

Add kernel.panic to kernel parameter, 10 is kernel crash after 10 seconds, auto restart system

vi/etc/sysctl.conf Kernel.panic = 10

The second step verifies that the automatic restart mechanism is in effect and needs to be configured SYSRQ

Add KERNEL.SYSRQ to kernel parameter, 1 for effective

vi/etc/sysctl.conf KERNEL.SYSRQ = 1

Run the command to make the configured parameters effective, or to restart the system

Sysctl-p/etc/sysctl.conf

Check that the configured parameters are in effect

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Simulate system kernel crashes, press alt+sysrq+c three keys at the same time, or run the following command

Echo C >/PROC/SYSRQ

Look to see the kernel crash and read the second reboot

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The third step is to configure the kernel dump

The newly installed system needs to be upgraded, otherwise it cannot install the software through Apt-get

Apt-get Update

Install kernel Dump

sudo apt-get install Linux-crashdump

See if it takes effect

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Test, simulate system kernel crashes, press alt+sysrq+c three keys at the same time, or run the following command

Found the system crashed, and stuck to the dead, no send dump, no reboot!

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After finding the data, sending such a situation may not be related to the core dump memory configuration, so modified the core Dum memory configuration

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Modified to 512M size

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Regenerate Grub.cfg

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Re-test, success.

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Ubuntu 12.04 configuration kernel crash Auto restart and dump