1、修改 vi/boot/grub/grub.conf （修改内容为红色标注位置）

# grub.conf generated by anaconda

#

# Note that you do not have to rerun grubafter making changes to this file

# NOTICE: You have a /boot partition.  Thismeans that

#         all kernel and initrd paths are relative to /boot/, eg.

#         root (hd0,0)

#         kernel /vmlinuz-version ro root=/dev/sda5

#         initrd /initrd-[generic-]version.img

#boot=/dev/sda

default=0

timeout=5

splashimage=(hd0,0)/grub/splash.xpm.gz

hiddenmenu

serial --unit=0 --speed=115200 --word=8--parity=no --stop=1

title CentOS (2.6.32-431.el6.x86_64)

       root (hd0,0)

       kernel /vmlinuz-2.6.32-431.el6.x86_64 roroot=UUID=f0013145-01cc-41ba-b202-0d9b6bc785c7 console=tty0 console=ttyS0,115200 rd_NO_LUKS   rd_NO_MDcrashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM

       initrd /initramfs-2.6.32-431.el6.x86_64.img

2、修改 vi /etc/inittab（修改内容为红色标注位置）

# Default runlevel. The runlevels used are:

#   0- halt (Do NOT set initdefault to this)

#   1- Single user mode

#   2- Multiuser, without NFS (The same as 3, if you do not have networking)

#   3- Full multiuser mode

#   4- unused

#   5- X11

#   6- reboot (Do NOT set initdefault to this)

#

id:3:initdefault:

# Run agetty on COM1/ttyS0 and COM2/ttyS1

s0:2345:respawn:/sbin/agetty -L -f/etc/issueserial 115200 ttyS0 vt102

3、修改vi /etc/securetty(修改内容为红色标注位置)

console

vc/1

vc/2

vc/3

vc/4

vc/5

vc/6

vc/7

vc/8

vc/9

vc/10

vc/11

tty1

tty2

tty3

tty4

tty5

tty6

tty7

tty8

tty9

tty10

tty11

ttyS0

ttyS1

4、配置完成后，重新启动即可。