Knowing Linux booting process is an essential part of every Linux user/administration which will give you a clear picture of how Linux Operating system works. In this post we will see what happens when a Linux OS boots i.e. after powering on the machine to the user log-in prompt. Below image will give you clear idea what will happen in Linux booting process.
A quick view of booting sequence:
Power on
CPU jumps to BIOS
BIOS runs POST
Finds first bootable device
Load and execute MBR
Load OS
User prompt
CPU jumps to BIOS
BIOS runs POST
Finds first bootable device
Load and execute MBR
Load OS
User prompt
This a rough idea what happens in Linux booting. Below are the detailed stages in Linux Booting process.
Stages of Booting:
1)System startup(Hardware )
2)Boot loader Stage 1 (MBR loading)
3)Boot loader Stage 2 (GRUB loader)
4)Kernel
5)INIT
6)User prompt
2)Boot loader Stage 1 (MBR loading)
3)Boot loader Stage 2 (GRUB loader)
4)Kernel
5)INIT
6)User prompt
