yum-plugin-priorities


vim /etc/yum/pluginconf.d/priorities.conf

[main]
enabled = 1
priority=n
[base], [updates], [extras]: priority=1.
[centosplus], [contrib]: priority=2.


wget http://mirror.de.leaseweb.net/epel/6/x86_64/epel-release-6-8.noarch.rpm 
rpm --import https://fedoraproject.org/static/0608B895.txt
rpm -K epel-release-6-8.noarch.rpm
rpm -i epel-release-6-8.noarch.rpm

vim /etc/yum.repos.d/epel.repo
priority=10