Saturday, 6 October 2012

linux boot order


  • Bios check the system and launch the first stage boot loader on the MBR of the primary   hard disk

  • First stage boot loader itself into memory and launch the second stage boot loader from boot partition


  • The second stage boot loader   load the kernel into memory, which in turn load any modules& mount root partition, read only

  • The kernel transfer control of the boot process to the /sbin/init program

  • /sbin/init program load all service and user interface tool and mount all partition listed in /etc/fstab

  • The user is presented with a login screen for freshly booted Linux system
                                                               
                                                                   System boot sequence

      • Grub stage one load MBR

      • Second stage  /boot/grub/stage1.5 (boot partition higher 1024 cylinder) 2

      • /boot/grub/grub.conf  ----- see selection os menu

      •  /boot/vmlinux.2.6.18-5.elxen load to ram

      • initrd block device load (scsi)

      • /etc/rc.d/rc.sysinit

      • /etc/sysconfig/clock

      • /etc/rc.serial

      • /etc/inittab

      • init – run level 5

      • /etc/inittab run script called /etc/X11/prefdm (X display manger)

      • /etc/X11

      • gdm,kdm or xdm
      • Depending on the content of the /etc/sysconfig/desktop file

      • /usr/X11R6/bin/xorg

      • /usr/X116/lib/modules

      • /etc/X11

      • /etc/X11/xorg.conf




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