ARM template outputs in Azure - Step-by-Step Execution

Process Flow - ARM template outputs

Define Outputs Section

↓

Reference Resource Properties

↓

Assign Output Values

↓

Deploy Template

↓

Retrieve Outputs

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Use Outputs in Scripts or UI

This flow shows how outputs are defined in an ARM template, assigned values from resources, deployed, and then retrieved for use.

Execution Sample

Azure

{
  "outputs": {
    "storageAccountName": {
      "type": "string",
      "value": "[variables('storageAccountName')]"
    }
  }
}

Defines an output named storageAccountName that returns the storage account name variable after deployment.

Process Table

Step	Action	Evaluation	Result
1	Define outputs section in template	Outputs section with storageAccountName key	Outputs section ready
2	Assign value to output	Value set to variable 'storageAccountName'	Output storageAccountName = 'mystorageacct123'
3	Deploy ARM template	Template deploys resources and outputs	Resources created, outputs stored
4	Retrieve outputs after deployment	Query outputs from deployment result	storageAccountName = 'mystorageacct123'
5	Use output in script or UI	Reference output value	Output value used successfully
6	End	No more outputs to retrieve	Execution complete

💡 All outputs retrieved and deployment finished

Status Tracker

Variable	Start	After 1	After 2	Final
storageAccountName	undefined	mystorageacct123	mystorageacct123	mystorageacct123

Key Moments - 3 Insights

Why do outputs need a type like 'string' or 'object'?

Outputs require a type to tell Azure how to handle and display the value, as shown in step 2 of the execution_table where the output type is 'string'.

Can outputs reference resources created in the same template?

Yes, outputs often reference resource properties created during deployment, as in step 2 where the output value uses a variable linked to a resource.

When can you access the output values?

Outputs are accessible only after deployment completes successfully, as shown in step 4 where outputs are retrieved.

Visual Quiz - 3 Questions

Look at the execution_table, what is the output value of 'storageAccountName' at step 2?

A "storageAccountName"

B "undefined"

C "mystorageacct123"

D "variables('storageAccountName')"

💡 Hint

Check the 'Result' column in row 2 of the execution_table.

At which step does the ARM template deployment complete and outputs become available?

A Step 4

B Step 3

C Step 5

D Step 2

💡 Hint

Look for when outputs are retrieved in the execution_table.

If the output type was missing, what would happen during deployment?

A Output is ignored silently

B Deployment fails due to missing output type

C Output defaults to string type

D Deployment succeeds but output is unusable

💡 Hint

Refer to key_moments about output type importance.

Concept Snapshot

ARM template outputs let you return values after deployment.
Define outputs in the 'outputs' section with a name, type, and value.
Values often reference resource properties or variables.
Outputs are accessible only after deployment finishes.
Use outputs to pass info to scripts or other templates.

Full Transcript

ARM template outputs are defined in the outputs section of the template JSON. Each output has a name, a type like string or object, and a value that usually references a resource property or variable. When you deploy the template, Azure creates the resources and stores the output values. After deployment completes, you can retrieve these outputs to use in scripts, UI, or other templates. Outputs must have a type to be valid. This flow ensures you get important info like resource names or IDs after deployment.