Centos关闭Ctrl+Alt+Del快捷键防止重新启动
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Centos操作系统只要按下Ctrl+Alt+Del快捷键，系统就会自动重新启动。如果数据正在写入，无意间按下Ctrl+Alt+Del快捷键，不会有任何提示和确认，系统就会直接重新启动，这样会造成服务器的突然宕机，造成很多麻烦，所以最好关闭此快捷键，以防误操作造成重新启动。
Centos 5.x关闭方式
关闭Ctrl+Alt+Del快捷键，需要编辑/etc/inittab文件，将对应的内容注释掉
[root@rac1 grub]# cat /etc/inittab
# Trap CTRL-ALT-DELETE
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now //默认为启用，在前面加上#号进行关闭
Centos 6.x关闭方式
查看/etc/inittab文件
[root@rac1 grub]# cat /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf由此可以看到在Centos 6.x中该参数已被移动到另外一个配置文件/etc/init/control-alt-delete.conf中了
查看/etc/init/control-alt-delete.conf文件
[root@rac1 grub]# cat /etc/init/control-alt-delete.conf
# control-alt-delete - emergency keypress handling
#
# This task is run whenever the Control-Alt-Delete key combination is
# pressed. Usually used to shut down the machine.
start on control-alt-delete
#exec /sbin/shutdown -r now "Control-Alt-Delete pressed" //在前面用#号注释掉