Nowadays, the installation of any nontrivial application spans more than one machine. Different machines provide specialized functions such as database servers, web servers, and many more. Heat is an OpenStack project that provides the users of OpenStack with the ability to start a group of connected resources such as VMs, Networks, Routers, and so on in order to create a complete infrastructure for deploying applications.
The tenant communicates with the orchestration system using the Heat client. A Heat template describes the stack of infrastructure resources requested by the user. A template consists of the following sections: