我是 CentOS 的新手，并试图启用 SELinux，但在重新启动后无法正常工作，如https://www.digitalocean.com/community/tutorials/an-introduction-to-selinux-on-centos-7-part 所述-1-基本概念。
每次重新启动后我收到的唯一错误消息是：
master:~# cat /var/log/messages | grep "SELinux"
Jul 14 22:11:48 master kernel: SELinux: Disabled at boot.
据谷歌告诉我，这意味着我的配置文件有 SELINUX=0 / SELINUX=disabled。但我的配置文件应该是正确的：
master:~# 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=permissive
# SELINUXTYPE= can take …