yum install http://repo.unmanarc.com/CentOS/7/RPMS/x86_64/mod_bw-0.92-2.el7.centos.x86_64.rpm
rpm -ql mod_bw
sed -i 's@extramodules/mod_bw.so@modules/mod_bw.so@g' /etc/httpd/conf.d/mod_bw.conf
systemctl restart httpd


originated
http://bitbull.ch/notes/post/bandwith-limitation-with-apache-on-centos-7/