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How to configure KDUMP on Oracle Linux 7
1). Install the kexec-tools package if not already installed:
To use the kdump service, you must have the kexec-tools package installed. To do so, type the following at a shell prompt as root:
# yum install kexec-tools
2). Configure kdump:
[1] Configure Memory usage
To configure the amount of memory that is reserved for the kdump kernel, edit /etc/default/grub and modify GRUB_CMDLINE_LINUX , set the crashkernel=<size> parameter to the list of kernel options.
For example:
# cat /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
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