Change the SELinux mode in /etc/selinux/config (optional):

sudo sed -i 's/SELINUX=.*/SELINUX=enforcing/' /etc/selinux/config 

sudo sed -i 's/SELINUX=.*/SELINUX=permissive/' /etc/selinux/config 

Reboot

During shutdown all of the files on the system will be labeled. This may take some time depending on how many files you have and disk speed.