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分类: LINUX

2009-05-14 15:45:28

Boot Sequence Overview
1. BIOS initialization
2.Boot Loader (1st-resides in MBR or boot sector ; 2st-loaded from boot partition)
          GRUB /boot/grub.conf
          if MBR on /dev/hda is corrupted,reinstall the first stage bootloader with:/sbin/grub-install /dev/hda
            if grub-install fail for some reason try: type the comment -grub Enter -root(hd0,0) -setup(hd0) -quit
       example of GRUB:
            #boot=/dev/sda
             default=0
             timeout=5
             splashimage=(hd0,5)/grub/splash.xpm.gz
             hiddenmenu
           title Red Hat Enterprise Linux Server (2.6.18-8.el5)
             root (hd0,5)
             kernel /vmlinuz-2.6.18-8.el5 ro root=LABEL=/ rhgb quiet
             initrd /initrd-2.6.18-8.el5.img
           title Other
             rootnoverify (hd0,0)
             chainloader +1
3.Kernel initialization (Device detection; Device driver initialization;Mounts root filesystem read ony; load init)
4.init starts and enters desired run level by executing: (/etc/inittab)
    -/etc/rc.d/rc.sysinit
    -/etc/rc.d/rc and /etc/rc.d/rc?.d/
    -/etc/rc.d/rc.local  (you can put your own scripts in there)
    -X Display Manager if appropriate  
      (system-config-services; ntsysv; chkconfig;  service ;  chkconfig;)
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