RPMs for RHEL, CentOS, and other RHEL Clones are available from the
CentOS Storage SIG.

See
  https://wiki.centos.org/SpecialInterestGroup/Storage

and also 
  http://buildlogs.centos.org/centos/7/storage/x86_64/gluster-3.8/

debuginfo rpms are available from
  http://debuginfo.centos.org/centos/7/storage/x86_64/