红帽全球峰会22.6. Kickstart commands for addons supplied with the RHEL installation program
The Kickstart commands in this section are related to add-ons supplied by default with the Red Hat Enterprise Linux installation program.
22.6.1. %addon com_redhat_kdump
The %addon com_redhat_kdump Kickstart command is optional. This command configures the kdump kernel crash dumping mechanism.
- Syntax
%addon com_redhat_kdump [OPTIONS] %end
The syntax for this command is different because it is an add-on rather than a built-in Kickstart command.
Kdump is a kernel crash dumping mechanism that allows you to save the contents of the system’s memory for later analysis. It relies on kexec, which can be used to boot a Linux kernel from the context of another kernel without rebooting the system, and preserve the contents of the first kernel’s memory that would otherwise be lost.
In case of a system crash, kexec boots into a second kernel (a capture kernel). This capture kernel resides in a reserved part of the system memory. Kdump then captures the contents of the crashed kernel’s memory (a crash dump) and saves it to a specified location. The location cannot be configured using this Kickstart command; it must be configured after the installation by editing the /etc/kdump.conf configuration file.
For more information about Kdump, see the Installing kdump.
- Options
-
--enable- Enable kdump on the installed system. -
--disable- Disable kdump on the installed system. --reserve-mb=- The amount of memory you want to reserve for kdump, in MiB. For example:%addon com_redhat_kdump --enable --reserve-mb=128 %endYou can also specify
autoinstead of a numeric value. In that case, the installation program will determine the amount of memory automatically based on the criteria described in the Memory requirements for kdump section of the Managing, monitoring and updating the kernel document.If you enable kdump and do not specify a
--reserve-mb=option, the valueautowill be used.-
--enablefadump- Enable firmware-assisted dumping on systems which allow it (notably, IBM Power Systems servers).
-
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