We are having an issue that seems to have appeared since last week with building OOD on our centos platform and using the rhel-server-rhscl-7-rpms repo. In fact it appears to have emerged just over the past day. Yesterday I could work around it by forcing a specific baseurl for this repo. Today, even the base url I used yesterday is not working.
yum install ondemand results in a bunch of 404 errors looking for packages:
http://www.gtlib.gatech.edu/pub/centos/7/sclo/x86_64/rh/rh-git29/rh-git29-2.3-5.el7.x86_64.rpm: [Errno 14] HTTP Error 404 - Not Found