15.6. Configuration file for kdump

This option removes arguments from the current kdump command line. It removes parameters that can cause kdump errors or kdump kernel boot failures. These parameters might have been parsed from the previous KDUMP_COMMANDLINE process or inherited from the /proc/cmdline file.

When this variable is not configured, it inherits all values from the /proc/cmdline file. Configuring this option also provides information that is helpful in debugging an issue.

To remove certain arguments, add them to KDUMP_COMMANDLINE_REMOVE as follows:

# KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb"

This option appends arguments to the current command line. These arguments might have been parsed by the previous KDUMP_COMMANDLINE_REMOVE variable.

For the kdump kernel, disabling certain modules such as mce, cgroup, numa, hest_disable can help prevent kernel errors. These modules can consume a significant part of the kernel memory reserved for kdump or cause kdump kernel boot failures.

To disable memory cgroups on the kdump kernel command line, run the command as follows:

KDUMP_COMMANDLINE_APPEND="cgroup_disable=memory"

See /etc/sysconfig/kdump file for more information.