IaaS Heat Template Specifications

Preface
Document history
Preface
What is Heat?
Heat Orchestration Template (HOT) format
Supported resource types
Resource type details
Example templates
Resource type properties
Creating stacks using APIs
Handling errors
Referring to outputs
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Heat Orchestration Template (HOT) format
Parameters Section
The parameters section defines the input parameters used when the template is instantiated.
Parameter Constraints
This section explains the format of constraints in the parameters section.
allowed_pattern
Specifies constraints for a string parameter. It specifies a regular expression that specified values must match.

Heat Orchestration Template (HOT) format
- Template Structure
  The Heat Orchestration Template (HOT) is defined in YAML format.
- Parameters Section
  The parameters section defines the input parameters used when the template is instantiated.
  - Parameter Constraints
    This section explains the format of constraints in the parameters section.
    - length
      Specifies constraints for a string parameter. The minimum and maximum number of characters can be defined.
    - range
      Specifies constraints for a number parameter. The minimum and maximum value can be defined.
    - allowed_values
      Specifies constraints for a string or number parameter. It specifies a regular expression that specified values must match.
    - allowed_pattern
      Specifies constraints for a string parameter. It specifies a regular expression that specified values must match.
    - Example of specified constraints
  - Pseudo parameters
    There are parameters provided by Heat separately to the input parameters. These parameters can be referenced using the embedded function get_param, in the same manner as for the parameters defined using the template.
- Resources Section
  The resources section defines the resources that make up a stack deployed from the template (for example, compute instances, networks, storage volumes).
- outputs Section
  The outputs section defines output parameters that should be available to users.
- Intrinsic Functions
  The embedded functions described below can be used in the HOT template.

allowed_pattern

Specifies constraints for a string parameter. It specifies a regular expression that specified values must match.

allowed_pattern: <regular expression>

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