MySQL 5.7 Release Notes
        
      The instructions that follow use the semanage
      binary to manage port context; on RHEL, it's part of the
      policycoreutils-python-utils package:
    
yum install -y policycoreutils-python-utils
      After installing the semanage binary, you can
      list ports defined with the mysqld_port_t
      context using semanage with the
      port option.
    
$> semanage port -l | grep mysqld
mysqld_port_t                  tcp      1186, 3306, 63132-63164