When I use the SSH method to transfer a kdump vmcore, the resultant vmcore.flat file is unreadable by crash. What am I doing wrong and how can I fix this?
문제
A kdump core file vmcore.flat was captured via the SSH capture method. The core file cannot be read by the Crash analysis tool.
환경
- Red Hat Enterprise Linux (RHEL) 5 and 6
해결
converting on RHEL 5
Run the following command against the file to rearrange the dump data vmcore.flat into a dumpfile /tmp/vmcore-rearranged readable by crash:
/sbin/makedumpfile -R */tmp/vmcore-rearranged* < *vmcore.flat*
converting on RHEL 6
Run the following command against the file to rearrange the dump data vmcore.flat into a dumpfile /tmp/vmcore-rearranged readable by crash:
/usr/sbin/makedumpfile -R */tmp/vmcore-rearranged* < *vmcore.flat*
For more information on how to set up and configure kdump, see How do I configure kexec/kdump on Red Hat Enterprise Linux 5?.
Comments
When transferring a kdump core file via the SSH capture method, the core file is serialized for the transfer. This creates a vmcore.flat file in the receiving server's /var/crash directory. This file format cannot be read by Crash without first processing it with makedumpfile.
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