An overly simplified introduction to Google Deployment Manager Part 3: The advanced concepts


This post is the third part of the Google Deployment Manager (GDM) series. For a simplified overview and evolution of operations followed by an introduction to GDM, check out the first part of the series here followed the second part here which talks about using configurations in GDM.

Using Python Libraries

GDM supports only a handful of python libraries for use with it. You will find the complete list of supported libraries here.

  • To use any other library, the library source needs to be added to the template source code.
  • Any system call using python will be rejected by GDM.


A schema allows defining setting validation for a supplied template. GDM uses the schema to validate the template before it is expanded and deployed. An example would best depict it.

Let’s say we are defining templating for VPC. You need to place the below schema alongside the template.

  title: Network
  description: >
    Creates a single network and its subnetwork

- subnetworks

    type: array
    description: >
      An array of subnetworks.
      description: >
        A subnetwork, defined by its region and its CIDR.
      type: object
          type: string
          type: string

This schema defines subnetworks as a required field of type array.

Composite Types

If you find yourself deploying the same set of resources repeatedly, it is possible to use the defined templates for these together as a composite type. An example would be, deploying an internal load balancer, which consists of 4 resources. These resources can be deployed as a composite resource for better user experience and management.


Templates for most of the resources in GCP are already developed, ready for use. You can find these here inside the cloud-foundation-toolkit GitHub. repository.


Published Aug 17, 2021