How to troubleshoot Azure Resource Manager (ARM) template validation errors

Deploying Azure Resource Manager (ARM) templates with the Azure PowerShell command New-AzureRmResourceGroupDeployment can fail for a variety of reasons. One of the more confusing situations can occur when handling template validation errors (Code=InvalidTemplateDeployment). This is because sometimes additional context is missing from the Exception and you have to lookup more information into order to troubleshoot the issue. In this post we will take a closer look at this particular error and how to resolve it.

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Working with arrays of objects and multiple resource instances in Azure ARM templates

The ‘copy’ property is an Azure ARM template feature that allows you to iterate (for each) loop over a resource to create multiple copies of it. You can combine it with an ‘array of objects’ custom parameter to easily duplicate resources with your supplied values. However there are a couple of snags you might run into so I figured it’s worth a write up with an example.

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How to troubleshoot New-AzureRmResourceGroupDeployment ‘parameter cannot be found’ errors

Scenario: You have an Azure RM deployment template JSON file. You initiate a deployment with the New-AzureRmResourceGroupDeployment PowerShell cmdlet and pass in some custom parameters. You immediately hit this all too common error: “New-AzureRmResourceGroupDeployment : A parameter cannot be found that matches parameter name ‘<myParameter>’“.

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A quick tip for debugging Azure ARM template expressions

Azure Resource Manager (ARM) templates have a nice set of built-in functions that allow you to develop complex expressions. These expressions can help a static deployment template file become more scalable and flexible for different scenarios. This article is a quick rundown on my new favorite tip for debugging a template expression that you just can’t get working. 

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