Apache Solr can be run as IaaS or PaaS on different Cloud providers. The difference between IaaS and PaaS is that IaaS will require additional steps to install the underlying platform (operating system). The setup of the operating system is out of the scope of this book; however, many OS vendors provide excellent documentation about how it can be set up. We will look at some of the implementations of Solr using IaaS and PaaS providers. Among them, Amazon AWS is a well-established Cloud provider, and Gartner has placed it in the top right in a magic quadrant for its richest IaaS/PaaS product portfolio. It is constantly expanding its service offerings and reducing its prices. In this section, we will be focusing on setting up Solr with AWS.