Deploy a Web App with Storage Account using ARM Templates

Azure Resource Manager (ARM) templates are a declarative Infrastructure as Code (IaC) solution for defining, deploying, and managing Azure resources using JSON. Real infrastructure is rarely a single resource: a web application needs a hosting plan, the app itself, and the backing services it reads and writes. ARM templates express all of that in one file, and Resource Manager works out the order to create it in. Where a resource genuinely depends on another existing first, the dependsOn property makes that ordering explicit, so a Storage Account is fully provisioned before anything tries to read its keys.

The harder problem in a multi-resource deployment is wiring the resources together without hardcoding secrets. ARM solves this with template functions that run at deployment time. resourceId() builds a fully qualified reference to another resource in the template, and listKeys() calls the resource provider to retrieve its access keys during the deployment itself. Combined with concat(), this lets a template assemble a Storage Account connection string and inject it straight into an App Service's application settings, so the credential is never written into source control and never copied by hand. The deployment becomes fully repeatable: run it against an empty resource group and you get a working, connected application.

Objectives

By completing this Intermediate challenge, you will be able to:

• Author an ARM template that deploys multiple interdependent Azure resources in a single deployment.
• Control resource creation order with the dependsOn property.
• Retrieve Storage Account access keys at deployment time using the listKeys() and resourceId() functions.
• Assemble a Storage Account connection string with concat() and inject it into App Service application settings.
• Deploy a multi-resource template to a resource group using the Azure CLI and verify the resulting configuration.

Prerequisites

Before attempting this challenge, you should be comfortable with:

• ARM template structure and syntax
• Parameters, variables, and outputs
• Using uniqueString() and concat() functions
• Deploying templates with Azure CLI
• Creating Storage Accounts with ARM templates

Recommended Lab: Deploy an Azure Web App using an ARM Template