Reasons for installing CentOS 6.6,kdump boot failure in Vmmware

New CentOS 6.6 installed in VMware, restart System Discovery Kdump Service failed to start

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First of all, what is Kdump

Kdump is an advanced kexec-based kernel crash dump mechanism. When the system crashes, Kdump starts with kexec

to a second kernel. The second kernel, often called the capture kernel, boots up in small memory to capture the dump image. The first kernel guarantees a

Left a portion of the memory for the second kernel to start with. Since Kdump uses kexec to boot the capture kernel, bypassing the BIOS, the

The memory of the first kernel is preserved. This is the essence of kernel crash dumps.

Reason for startup failure

View/etc/grub.conf File

Discover Crashkernel=auto,

The system defines the Crashkernel=auto as:

If the system's memory <= 8 GB to kdump kernel no content is retained;

To turn off the Kdump function on the machine;
If the system memory > 8 GB but <= Gb,crashkernel=auto will retain 256M, equivalent to crashkernel=256m;
If system memory > 16GB, Crashkernel=auto will retain 512M, equivalent to crashkernel=512m

When the virtual machine is installed, the memory set to the VM is 1G, so the system shuts down the kdump.

Find the reason and re-set the parameters to Crashkernel:

In the Kdump configuration, it is often confusing to crashkernel settings. "[Email protected]", how big should X be? Y

And where should it be located? Actually we can completely omit this part of "@y" so that kernel will automatically choose for us

A starting address. And for the size of X, like the i386/x86_64 system, set to 128M; for PowerPC

System, it should be set to 256M.

Change Crashkernel=auto to crashkernel=128m after saving,

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Restart the system and the Kdump service started successfully.

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This article is from the "WOYMK" blog, make sure to keep this source http://woymk.blog.51cto.com/10000269/1621341

Reasons for installing CentOS 6.6,kdump boot failure in Vmmware