You need to prepare a .zip package. For the package structure, see Figure 1.

Figure 1 Package structure

Resources Directory
This directory is used to store the files referenced by template files in the root directory. You can save the template files, configuration files, and script files used by the template in this directory. Templates of a nested stack must be placed in this directory. Do not change the name and structure of the directory.

Figure 2 Structure of Resources directory
File logo.png
The default file name logo is recommended, and there are no restrictions on the logo file name. However, if the file name is different from the default logo.png file, you need to ensure that the logo file name in the package is consistent with the Logo value in file manifest.yaml.

File logo.png is not supported and will be supported in later versions.
File manifest.yaml
File manifest. yaml describes basic information of the package. The default file format is recommended. The following is an example file:
```
Format: Heat.HOT/1.0
Type: Application
FullName: Reserved
Name: Auto Scaling Group
Description: "Heat template to deploy a stack."
Author: RTS
Tags:
  - hot-based
Logo: logo.png
```
The file name is fixed and cannot be user-defined.

random.yaml and template.yaml

random.yaml and template.yaml are two example templates. You can define your own template based on these example templates. random.yaml is a template file that can be used to create random strings. This file can be used to create two random strings. template.yaml is a nested template file, which contains a nested template (random1.yaml). The sub-template is in the Resources/HotFiles directory.

The following is an example manifest.yaml file:

heat_template_version: 2014-10-16
description: Create a serious of random string

parameters:
  length:
    type: number
    default: 4

resources:
  random1:
    type: OS::Heat::RandomString
    properties:
      length: {get_param: length}
  random2:
    type: OS::Heat::RandomString
    properties:
      length: {get_param: length}

The following is an example template.yaml file:

heat_template_version: 2014-10-16
description: Create a serious of random string

parameters:
  length:
    type: number
    default: 4

resources:
  random1:
    type: OS::Heat::RandomString
    properties:
      length: {get_param: length}
  random2:
    type: OS::Heat::RandomString
    properties:
      length: {get_param: length}
  random3:
    type: random1.yaml

A valid package name contains a maximum of 32 characters, including letters, digits, hyphens (-), and underscores (_). The name must start with a letter and end with .zip.
The structure of directory Resources/HotFiles is fixed and cannot be changed.
When you use a .zip package, all template files in the root directory are displayed on the console, and you can select any template to create a stack.
If necessary, you can add a file named environment.yaml to the root directory configured on the console.
The logo file and the manifest.yaml file are mandatory and must be stored in the root directory.
If file get_file: abc.txt is used in the template, this file must be placed in directory Resources/HotFiles.
Other restrictions are as follows:
- The maximum size of a template file is 100 KB.
- The maximum size of a .zip package cannot exceed 80 KB.
- The maximum nesting depth is restricted to seven.
- The maximum number of files is 50.

Template Package Structure