$ vi /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELinux can be completly disabled with the "selinux=0" kernel
# commandline option.
#
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
SELINUX=disabled
# SELINUXTYPE= can take one of these three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

sed -i 's|SELINUX=enforcing|SELINUX=disabled|g' /etc/selinux/config
sed -i 's|selinux=1|selinux=0|g' /etc/default/grub
grub2-mkconfig -o /boot/grub2/grub.cfg

$ reboot