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Using Template Modules | Cloud Deployment Manager Documentation

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Template modules are helper files that perform specific functions that can make your templates more efficient. For example, you can have a module that generates unique names for your resources. Deployment Manager can execute any module written in Python or Jinja.

• If you want to use the command-line examples in this guide, install the `gcloud` command-line tool.
• If you want to use the API examples in this guide, set up API access.
• Understand how to create a basic template.
• Understand how to create a configuration

A template module is treated as a regular template file and can be written in Jinja or Python.

For example, the following is a helper template that generates a name given a prefix and suffix.

In Jinja, this helper template (in this example, named helpers/common.jinja) would look like the following:

You can then import this template and use it as a module. In your Jinja template, you could use the module like so:

The configuration must then import both files (including the helpers/common.jinja file):

The Deployment Manager service will expand the configuration and the final configuration looks like this:

resources:
- name: myfrontend-prod
  type: compute.v1.instance
  properties:
    zone: us-central1-f
    machineType: https://www.googleapis.com/compute/v1/projects/myproject/zones/us-central1-f/machineTypes/f1-micro
    disks:
    - deviceName: boot
      type: PERSISTENT
      boot: true
      autoDelete: true
      initializeParams:
        sourceImage: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/images/family/debian-9
    networkInterfaces:
    - network: https://www.googleapis.com/compute/v1/projects/myproject/global/networks/default
      accessConfigs:
      - name: External NAT
        type: ONE_TO_ONE_NAT

In Python, the helper template (in this example, named helpers/common.py) would look like this:

To use it in your Python template:

The configuration must then import both files (including the helpers/common.py file):

Here is a more complicated helper module:

• Use template properties to abstract your content.
• Populate information about your projects and deployments using environment variables.
• Add a template permanently to your project as a composite type.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["Template modules are helper files that enhance template efficiency by performing specific functions, such as generating unique resource names."],["Deployment Manager can utilize template modules written in either Jinja or Python, offering flexibility in coding preference."],["A template module can be imported and used within other templates, like the example provided where a Jinja template uses a module to generate a machine name with a given prefix and suffix."],["The configuration must import all used files, which include both the main template and any helper template modules, for the Deployment Manager service to properly expand it."],["The same principles apply to modules in Python, and the content shows examples of using a python module to generate names in a python template, as well as a more complicated python module example."]]],[]]

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