Using the IaaS, it is possible to automatically create and manage systems that involve virtual resources such as "virtual servers", "virtual networks", and "virtual volumes", using the provided orchestration function. Heat places requests for operations with the coordination function based on various definition templates (text-based).

In order to use Heat, text-based templates written in the YAML format are necessary. These templates are generally referred to as HOT (Heat Orchestration Templates), but in this document they are referred to as Heat templates.

Here, as an example, we explain the procedure for creating a stack from a Heat template, using the IaaS service portal.

The Heat Orchestration Template (HOT) is defined in YAML format.

The parameters section defines the input parameters used when the template is instantiated.

The resources section defines the resources that make up a stack deployed from the template (for example, compute instances, networks, storage volumes).

The outputs section defines output parameters that should be available to users.

The embedded functions described below can be used in the HOT template.

The following resource types can be specified in the Resources section.

Here we explain the procedure for creating a stack using the API execution function of the IaaS service portal.

Stack creation is not completed at the timing of the creation request. Therefore it is necessary to confirm the status of creation of the stack using the following procedure.

This section explains the corrective actions to take when an error occurs during stack creation, update, or deletion.

This section indicates the method for viewing the value of the outputs parameter from a stack created using a Heat template in which the Outputs Section has been defined.