單用戶進入方式
1）開機按 鍵盤   e    進入系統
2）找到 linux16 開始，LANG=zh_CN.UTF-8結尾一行，尾部加                                   （ 空格 加上 selinux=0）
3）然後 ctrl + x 啟動，就看到熟悉的登錄界面。

修改正確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後系統無法啟動