sudo mkdir -p /var/www/html/yumrepo/ #only first time
  sudo mv ~/rpmbuild/RPMS/noarch/perl-Excel-Writer-XLSX-1.03-1.el7.stopllc.noarch.rpm /var/www/html/yumrepo/
  sudo createrepo /var/www/html/yumrepo          # new or deleting rpms
  sudo createrepo --update /var/www/html/yumrepo # if only adding rpms