Linux 控制台重定向至Console口

1. 修改 /etc/grub.conf

新增行:
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console

示例:
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
title CentOS 6 (2.6.32-573.el6.x86_64)

Kernel 后插入:
console=ttyS0,115200n8
新增行:
console=tty0

示例:
kernel /vmlinuz-2.6.32-573.el6.x86_64 ro root=/dev/mapper/VolGroup-lv_root nomodeset console=ttyS0,115200n8 rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root  KEYBOARDTYPE=pc KEYTABLE=us vga=771 rd_NO_DM rhgb quiet
        console=tty0
        initrd /initramfs-2.6.32-573.el6.x86_64.img

2. 修改 /etc/inittab

新增行: 
S0:2345:respawn:/sbin/agetty -L -f /etc/issueserial 115200 ttyS0 vt100

示例:
id:3:initdefault:
S0:2345:respawn:/sbin/agetty -L -f /etc/issueserial 115200 ttyS0 vt100

3. 修改 /etc/securetty

新增行:
ttyS0

示例:
tty11
ttyS0