Linux Start-up process

I. Hardware boot boot

1. Power on

2. BIOS(Initialize hardware to find boot media)

3. MBR Total 512bytes

MBR contains:

1.446bytes:bootloader (GRUB)

2.64bytes:partition (partition Table)

3.2bytes:magic Number (checksum)

Two. Grub Boot boot

1. cat/boot/grub/grub.conf (view configuration file)

2. ls-l etc/grub/conf(usually view linked files)

3. Kernel (hd0,0) boot options

4. Stage1 in MBR stage2 stage1_5 link in disk

5. Stage2 (Kernel)

Stage1→stage1_5→stage2→grub.conf

Three. Kernel boot

1. /boot/kernel and kernel parameter

2. initrd

Four. Sys V init initialization phase

1. /sbin/init (/etc/inittab

2. /etc/rc.sysinit

3. /ETC/RC.D/RC (x). d/)

4. /sbin/mingetty (/etc/login)

Note:

chkconfig–list View System Load service

/etc/rc.d/rc.sysinit Initialize

/ETC/RC.D/RCX.D Run Level

/erc/rc.d/rc.loacl can be put into the start command tty1~6 Total 6 Plus graphical interface total of 7 terminals

Attach a picture for easy understanding:

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Linux Start-up process