To enable Oracle connections, follow these steps. Our example is for Oracle 11g on RHEL or CentOS 6.x.
Obtain the Oracle Instant Client RPM from the following URL: http://www.oracle.com/technetwork/topics/linuxx86-64soft-092277.html
For Oracle 11g, use
oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm
For Oracle 12c, use
oracle-instantclient12.1-basic-12.1.0.2.0-1.x86_64.rpm
Ensure the correct RPM is in the current directory. A directory listing request should show something similar to the following:
oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm
Install the RPM (and any dependencies).
sudo yum install oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm