selinux配置文件修改错误导致无法启动虚拟机

问题

[[email protected] ~]# cat  /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=enforcing
# 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 

[[email protected] ~]# cat  /etc/selinux/config ^C
[[email protected] ~]# getenforce
Enforcing

[[email protected] ~]# cat  /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=enforcing
# 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=disabled 

[[email protected] ~]# reboot 

Connection closed by foreign host.

Disconnected from remote host(10.0.0.73:22) at 16:56:13.

Type `help‘ to learn how to use Xshell prompt.
[c:\~]$ 

解决办法

重启，但是会比较慢，要等好几分钟

默认是单用户模式

[[email protected] ~]# cat     /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 

[[email protected] ~]# getenforce
Disabled
[[email protected] ~]# setenforce  1
setenforce: SELinux is disabled

[[email protected] ~]# echo  123456  |  passwd --stdin root
Changing password for user root.
passwd: all authentication tokens updated successfully.

注意此文件不需要修改

[[email protected] ~]# cat  /boot/grub2/grub.cfg  |  grep  linux16
    linux16 /vmlinuz-3.10.0-862.el7.x86_64 root=UUID=154fb900-77cf-4d55-975f-b788805fe281 ro rhgb quiet   net.ifnames=0  biosdevname=0
    linux16 /vmlinuz-0-rescue-581a9982f0474ce5bc2d9ba036f3bc8a root=UUID=154fb900-77cf-4d55-975f-b788805fe281 ro rhgb quiet   net.ifnames=0  biosdevname=0 

原文地址：https://www.cnblogs.com/wang618/p/12012494.html