16. ARM template modular design and implementation

We know that there are multiple ways to author an Azure Resource Manager (ARM) template. It is quite easy to author one that provisions all of the necessary resources in Azure using Visual Studio and Visual Studio Code. A single ARM template can consist of all the required resources for a solution on Azure. This single ARM template could be as small as a few resources, or it could be a larger one consisting of many resources.

While authoring a single template consisting of all resources is quite tempting, it is advisable to plan an ARM template implementation divided into multiple smaller ARM templates beforehand, so that future troubles related to them can be avoided.

In this chapter, we will look at how to write ARM templates in a modular way so that they can evolve over a period of time with minimal involvement in terms of changes and effort in testing and deployment.

However, before writing modular templates, it...