i take it you have NOT read the instructions on the wiki that the people over as Cent took a lot of time making
https://wiki.centos.org/FrontPage
how to install software repos
https://wiki.centos.org/AdditionalRe...s/Repositories
and for 6 the "Priorities"
https://wiki.centos.org/PackageManag...Yum/Priorities
it PROTECTS you from incompatible rpms from the third party sites
but it has to be installed and configured for it to WORK
cent6 is BETTER than cent5 was
BUT there are a LOT of rpms in the third party repos that can REPLACE CRITICAL SYSTEM FILES
with slightly DIFFERENT versions
sometimes these can FUBAR a install
if rpms built with different configurations are mixed
cent also moved over to using the documentation on the RedHat site
https://access.redhat.com/documentat...erprise-linux/
( whay have two sets when cent is really just a repackaged RHEL )