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You would better move to 6.5. Here it goes 1 and 2

You would better move to 6.5. CentOS 6.5 due to namespaces patch.
Here it goes 1 and 2
If your are willing to setup RDO IceHouse ( not Havana provided by links above)
Please view RDO Official. It works on F20 just fine
I did a couple of days ago, but step by step only for AIO Havana via packstack --allinone on 6.5.