Why does grub2-mkconfig command not reflect configuration change in /etc/default/grub?

Solution Verified - Updated -

Issue

  • Why does grub2-mkconfig command not reflect configuration change in /etc/default/grub?

  • There are multiple same parameters in /etc/default/grub. The latest parameter is only affected.

    $ /cat etc/default/grub 
GRUB_TIMEOUT=5
GRUB_DEFAULT=1
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=512M"  <--- This line is not affected.
GRUB_DISABLE_RECOVERY="true"
GRUB_CMDLINE_LINUX="audit=1" <--- This line is valid

Environment

  • Red Hat Enterprise Linux7
  • grub2

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