Linux Boot Process
When we press the power button of computer which has Linux Operating system, and after few minutes Linux Login prompt comes. We wonder that how it happens behind the screen. Let’s simplify Linux OS Booting process. 1) BIOS – Basic Input Output System Checks system integrity Looks for boot loader program at cdrom / flopy / harddisk Have a facility to change booting parameter via F12/Del/F2 as per the system Load the boot loader and transfers control to it Summary: It goes with first boot options and provides control to MBR (Master Boot Record) 2) MBR – Master Boot Record Situated into first sector of bootable disk . example - /dev/sda , /dev/sdb, /dev/hda It has information about boot loader ( GRUB / LILO ) Its size is less than 512 bytes and having 3 components o Primary Boot Loader Information o Mbr validation check o OS partition table information Summary: It executes GRUB (