You must already have Oracle Linux installed on the server.
Choose a method for updating the Oracle Linux operating system:
For Oracle Unbreakable Linux Network (ULN) installations, create
local yum repositories and configure yum and up2date to install
update packages from them.
Note -
This yum server is offered without support of any kind. If you
require errata, security patches, and other updates, you should
use the Oracle Unbreakable Linux Network (ULN) at http://linux.oracle.com/Unbreakable Linux
Network (ULN).