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Officially OracleDB is only supported on Oracle Linux, Red Hat Enterprise Linux, and SUSE Enterprise Linux. Though Oracle Linux, like CentOS, is based on RHEL. They are so closely related that Oracle offers a script that will “turn” a CentOS 6 installation into an Oracle one.
curl -O https://linux.oracle.com/switch/centos2ol.sh
sh centos2ol.sh
After you’ve run that script on a CentOS 6.5 droplet, you should be able to install OracleDB 11g with:
yum install oracle-rdbms-server-11gR2-preinstall