查看selinux运行状态

selinuxenabled && echo enabled || echo disabled

临时生效

setenforce 0

关闭selinux并且立即生效，并且是永久生效

setenforce 0
sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

3个状态说明
# This file controls the state of SELinux on the system.
# SELINUX=disabled
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.