009 Embedded Linux-ARM. StorageQueries and discussion related to usage of Linux on ARM based devices. Linux has been ported to a variety of CPUs which are not only primarily used as the processor of a desktop or server computer, but also ARM, AVR32, ETRAX CRIS, FR-V, H8300, IP7000, m68k, MIPS, mn10300, SuperH, and Xtensa processors, It is also used as an alternative to using a proprietary operating system and toolchain. » 009.04.Boot Loaders
009.04.91.10. When customizing GRUB2 settings, what are some common modifications made in `/etc/default/grub`, and how do these changes impact the boot process of a Linux system? Additionally, could you discuss the role of scripts in the `/etc/grub.d/` directory and provide examples of scenarios where administrators might need to customize these scripts?
Here are the modifications made in /etc/default/grub:-
GRUB_DEFAULT : Specifies the default menu entry either by number, saved state or menu entry title.
GRUB_TIMEOUT : Set the amount of time before the default entry is automatically booted.
GRUB_CMDLINE_LINUX_DEFAULT : Adds additional kernel parameters that are applied to all linux menu entries.
GRUB_BACKGROUND : Allowsthe setting of a background image for the GRUB menu.
GRUB_THEME : Specifies a graphical theme for the GRUB menu, enhancing the visual interface.
These changes help make boot process faster and easier.
We can customize menu entries by modifying scripts within /etc/grub.d. The 40_custom script file is commonly used for adding custom boot entries. This file is not overwritten during updates making it safe for persistent custom configurations.
Commenting in configuration files can be invaluable for documentation purposes, especially when customising the /etc/grub.d scripts. Comments explain the purpose of specific changes or custom entries, which is useful during troubleshooting or future modifications.
