After installing Oracle Clusterware, as described in Oracle Grid Infrastructure Installation Guide for your platform, you can install Oracle RAC Database software.

• About Image-Based Oracle Database Installation
  Understand image-based installation to simplify installation and configuration of Oracle Database software.
• Setup Wizard Installation Options for Creating Images
  Gold image-creation options to use with your Oracle Database or Oracle Grid Infrastructure installation setup wizards.
• Downloading the Software from Oracle Software Delivery Cloud Portal
  You can download the software from Oracle Software Delivery Cloud.
• Installing Oracle RAC and Oracle RAC One Node Databases
  Understand the process to install Oracle Real Application Clusters (Oracle RAC) and Oracle RAC One Node Databases.
• About Deploying Oracle Databases Using Oracle Fleet Patching and Provisioning
  Provision, patch, and upgrade software homes on any number of nodes from a single cluster with standard gold images using Oracle FPP.