RHEL7 Boot Process Step by Step Explained - Tech Arkit

RHEL7 Boot Process will like this see this video and understand complete picture.

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Poweron
-- SMPS - Switched-mode Power Supply
-- POST - Power On Self test
-- BIOS - Basic Input Output System
-- MBR - Master Boot Record
-- 446 Bytes - Bootloader information
-- 64 Bytes - Partition Information
-- 2 Bytes - Magic bytes to identify errors
-- GRUB - Grand Unified Boot Loader
-- /boot/grub2/grub.conf
-- 1 The 446 Byte file for stage 1 is named boot.img and does not contain the partition table which is added to the boot record separately.
-- 1.5 The first partition on the hard drive begins at sector 63 and with the MBR in sector 0, that leaves 62 512-byte sectors—31,744 bytes—in which to store the core.img file which is stage 1.5 of GRUB.
-- 2 The function of GRUB2 stage 2 is to locate and load a Linux kernel into RAM and turn control of the computer over to the kernel
-- initramfs
-- /sysroot - Read Only - compressed format will be extracted
-- systemd - fork(); call
-- Target will be loaded
-- Services will be started
-- User Interface

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