sudo setenforce 1

 this is the content of /etc/selinux/config file 

   # 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 these two values:
 # default - equivalent to the old strict and targeted policies
 # mls     - Multi-Level Security (for military and educational use)
 # src     - Custom policy built from source
 SELINUXTYPE=default

 # SETLOCALDEFS= Check local definition changes
SETLOCALDEFS=0