From the course: Red Hat Certified System Administrator (EX200) Cert Prep: 1 Deploy, Configure, and Manage (2021)

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Understand the Linux boot process

Understand the Linux boot process

- [Instructor] A Linux system goes through several stages when booting. The firmware stage, the boot loader stage, the kernel stage, and lastly, the initialization stage. During the firmware stage, the computer runs code in either the BIOS or UEFI during power on self test or post. Older computers have a BIOS and newer computers have UEFI. After the firmware stage, the BIOS or UEFI executes the boot loader stage. In the case of Enterprise Linux, the boot loader is grub2, or Grand Unified Boot Loader 2. Grub's job is to read in its configuration file and boot the Linux kernel. In the case of a BIOS machine, grub reads in /boot/grub2/grub.cfg. For UEFI systems, it loads /boot/efi/EFI/redhat/grub.efi. The boot loader then executes the kernel. During the kernel stage, the kernel loads the ramdisk into memory. This ramdisk serves as a temporary route file system. This file system includes kernel modules, drivers, and…

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