故障现象：selinux 配置 disabled 后开机卡在滚动条无法进系统
解决思路：单用户模式下修改修改selinux 配置
单用户进入方式
1）开机按 键盘 e 进入系统
2）找到 linux16 开始，LANG=zh_CN.UTF-8结尾一行，尾部加 （ 空格 加上 selinux=0）
3）然后 ctrl + x 启动，就看到熟悉的登录界面。
修改正确selinux
vim /etc/selinux/config
vim /etc/selinux/config
This file controls the state of SELinux on the system.
SELINUX= can take one of these three values:
enforcing - SELinux security policy is enforced.
permissive - SELinux prints warnings instead of enforcing.
disabled - No SELinux policy is loaded.
SELINUX=disabled
SELINUXTYPE= can take one of three two values:
targeted - Targeted processes are protected,
minimum - Modification of targeted policy. Only selected processes are protected.
mls - Multi Level Security protection.
SELINUXTYPE=targeted
selinux配置disable后系统无法启动
原文：http://blog.51cto.com/adcit/2129403
