linux booting process

LINUX BOOTING PROCESS

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BIOS

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BASIC INPUT OUT PUT SYSTEM

PERFORMS BASIC SYSTEM INTEGRITY TEST

ALSO CALLED AS POST (POWER ON SELF RTEST)

ACTIVATES MBR

MBR

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MASTER BOOT RECORD

LOCATED AT FIRST SECTOR OF THE BOOTABLE DEVICE

ACTIVATES GRUB OR BOOT LOADER

GRUB

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GRAND UNIFIED BOOT LOADER

EXECUTES KERNEL

KERNEL

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CORE OF LINUX SYSTEM

LOADS ROOT FILE SYSTEM, INIT AND ALL DEVICE DRIVERS

INIT

INITIATE THE RUNLEVEL REFFERING TO THE /ETC/INITTAB

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RUNLEVELNOTHING BUT MODE OF OS TO BE BOOTED

0 - IS FOR HALT

1 – FOR SINGLE USER MODE

2 - MULTIUSER WITHOUT NETWORK

3 - MULTI USER WITH NETWORK

4- UNUSED

5 - X11 OR GRAPHICAL MODE

6 - REBOOT

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