[RHCE]redhat system management(I)

1, process of boot
    BIOS initialization
    boot loader: firstly small, resides in MBR or boot section;  then loaded from boot partition
    kernel initialization
    init starts and enters desired run level: /etc/inittab

2, minmum specifacation of OS
    for linux: label, kernel location, OS root filesystem, location of initial ramdisk
    other os, label, boot device

3, grub: Grand Unified bootloader
  grub.conf
    command line interface at boot prompt
    start from filesystem
    support md5 password

4, service management
utilities to control default services startup:
  system-config-services: graphical utility that requires a X interface
  ntsysv: ncurses based utility usable in virtual consoles
  chkconfig: a fast, versatile command line utility that works well and is  usable with scripts and kickstart installations.

utilities to control service manually:
  service: immediately startup or stop a standalone service
  chkconfig: immediately startup or stop a Xinted managed service