When attempting to install openstack via RDO on CentOS 6.5 it receives package not found error for mongodb. It seems that epel does not have mongodb-server in it anymore. Many epel package listings do not have it anymore. (ie https://apps.fedoraproject.org/packages/mongodb-server/contents) I added the mongo-10gen-server repo from mongodb-org but the install still attempted to find the package. New to RDO so it took me a number of hours to hunt down and adjust the server_install_spec.rb and params.pp files within openstack-puppet so that it would search yum for the new package name (mong-10gen-server or mongodb-org-server). To get it working without issue. Surprised that this hasn't been found soon actually.
Directory of adjusted files are:
mongodb-server was briefly dropped from EPEL but has since been restored, and I am able to successfully install the package on a CentOS 6/EPEL system.