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Red Hat Certified System Administrator EX200 (RHEL 10) · Domain 7: Deploy, configure and maintain systems

Modifying the boot loader: grubby, /etc/default/grub and grub2-mkconfig

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Last reviewed September 25, 2026 · Leer en español

GRUB 2 (GRand Unified Bootloader) is the boot loader on RHEL. It shows the boot menu, loads the chosen kernel and initial RAM disk, and passes the kernel command line. RHEL stores each kernel's menu entry as its own small file in /boot/loader/entries/, following the BLS (Boot Loader Specification). Knowing where settings live tells you which tool changes them.

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