Azure Built In Tagging Policy. Update Resource by Inheriting Subscription Tag

Ensure your Azure Resources are tagged with the Tag from Subscription

In this example we have the following requirements

  • The costCentre tag has been manually added to the Subscription
  • Every resource must be created with a costCentre
  • The CostCentre tag must exist on the resources
  • The Resources inherit from the container they are in, but can be manually overridden

Costcentre Tag Configuration

  • Modify Resources to add the CostCentre tag from the parent Subscription where missing

Time to assign a new Policy

No Need to select a Resource group because they haven’t been created yet and this applies to all resource groups that have yet to be created

Choose Inherit a tag from the subscription if missing

The Assignment Name has been changed to include the tag

And the tab name is added as a parameter

We need a Managed Identity because this has a modify effect

Then go to Review + Create and Create

Test the New Modify Policy

This is the tag on the Subscription

Create a New Resource Group (And remember to apply any tags of Policies you have already set

Within this Resource Group, Create a New Resource (Dont add the tag)

Once created, the Resource will inherit the Tag from the Subscription

Azure Built in Tagging Policy. Deny the Creation of a Resource group

Deny the creation of a resource group without applicationName Tag

Every resource group should have an application name because Resource Groups should be Application Related. However you cant get the applicationName from the Above Subscription.

As a Example, the Resource Group is for HR Performance.

applicationName Tag Configuration

  • Deny the resource group if its missing the applicationName tag

Steps to apply this policy in Azure

Search for policy and Assign

Go to Assignments. This shows you all the policies or Initiatives that are in place. The Scope for this shows that the all subscriptions are being shown in this list.

Click Assign Policy

Set Scope of Policy

First thing you need to do is set the Scope. We have Management groups in place and as a test, a Personal Subscription is being used

The Resource Group isn’t set because this is just being set at Subscription level

Exclude Resource

You can also exclude resource, and in this case resources from the above Policy. However for this policy we don’t need to do this.

Set the Policy Definition.

There are two types of definitions. Custom and built in

If you look for ‘Tag’ you get a list of the Built in Definitions for tags.

We know that we want to ‘Require a tag on resource groups’ so this built in policy can be selected

Choose the Built in policy and Select

The Assignment Name has been slightly changed to include the tag this will be set for

We are in the Basics tab at the moment

Parameters

Go to the Parameters Tab.

Remediation

Click the Remediation Tab

In order to understand the Remediation tab there are a few specific concepts to Understand

Managed Identity

Managed identities is a more secure authentication method for Azure cloud services that allows only authorized managedidentity-enabled virtual machines to access your Azure subscription.

This means that any service that ‘does something’ to another service can do so automatically using a Managed Identity

DeployIfNotExists and Modify effects

Every single Policy in Azure Policy has a single effect. Effects behave differently if they are for a new, updated or existing resource. The Effects supported are:

  • Append
  • Audit
  • AuditIfNotExists
  • Deny
  • DeployIfNotExists
  • Disabled
  • EnforceOPAConstraint (preview)
  • EnforceRegoPolicy (preview)
  • Modify

The question is. What is the effect of Require a tag on resource groups

Definitions

Go to Definitions in Policy and Search for the Built in Policy.

The effect of your chosen built in Policy the effect is to deny .

You can also see the JSON Definition of the chosen Policy

Because the Policy is deny we don’t need to set up a Managed Identity

Click Review + Create

And Click Create

Definitions

Going back to the policy Definition

You can see that this Policy has been assigned to a Subscription

Checking your Policy has worked

To test the policy create a new resource Group within the selected Subscription without adding any tags

Resource ‘Test-RG’ was disallowed by policy. Policy identifiers: ‘[{“policyAssignment”:{“name”:”Require tag applicationName on resource groups”,”id”:”/subscriptions/7e7aeec9-7cb0-4963-a029-128c29530b5f/providers/Microsoft.Authorization/policyAssignments/febb7d3199864e4ab84411f5″},”policyDefinition”:{“name”:”Require a tag on resource groups”,”id”:”/providers/Microsoft.Authorization/policyDefinitions/96670d01-0a4d-4649-9c89-2d3abc0a5025″}}]’.

Because the Name of the required tag was added into the Policy name, the warning lets you know which tag you need to set.

You can Implement this on any resource group that needs a tag setting when it cant inherit from anything above (Like Subscriptions)

Azure Use Policies for Tagging Introduction

When you get started with Azure, you want to ensure that your resource groups and resources are tagged. this is great for Management of your Azure Subscriptions/

You can categorise all your resources with tags. You can also view Billing by Tags.


When you add a tag into the Portal (Or programatically) you can add in any tag name as you go. Once created they come up in a list and you can choose from them again.

You can use Azure Policies to try and Enforce some Tagging Logic

Azure Policies

Policies allow you to use the built in or custom definitions. the Policies can then be assigned to a Management group, Resource Group or Subscription

Policies are executed when new resources are created. old resources may not be compliant

You can use built in tagging Policies that are already defined within definitions in JSON (Built in)

Or you can add a new definition by adding your own JSON or copying and amending a built in Policy (Custom)

We are going to have a look at some specific examples of how to use Policies for Tagging.

aedhttps://debbiesmspowerbiazureblog.home.blog/2020/05/05/azure-built-in-tagging-policy-deny-the-creation-of-a-resource-group/

https://debbiesmspowerbiazureblog.home.blog/2020/05/05/azure-built-in-tagging-policy-resource-group-to-inherit-subscription-tags/

https://debbiesmspowerbiazureblog.home.blog/2020/05/05/azure-built-in-tagging-policy-update-resource-by-inheriting-subscription-tag/

Azure Tagging with Powershell Example

Azure uses Tagging for easier management. Tagging is done with Key value pairs. You can create the manually in the Azure Portal but you can also do it programatically via Powershell (For Example)

For this example Log onto the Azure Portal, Open Cloud Shell (This is the new Azure Portal, Not classic)

And set it to run with powershell

Just to get warmed up, lets list all our Resource groups

Get-AzResourceGroup

You can right click in powershell and paste the code above. then click Enter

This gives you a list of all your resource Groups


You even get a list of tags for each resource group with the above command

However, the resource groups that are available to me currently are the ones on my personal visual studio subscription. the Current Subscription

Lets see what subscriptions we have available

Get-AzureRMSubscription

You get the Subscription Name, ID and TenantID

Lets find out the current Subscription Context

Get-AzureRmContext

You can also use the following command to get subscription details

(Get-AzureRmContext).Subscription

Now we want to change the current Subscription context. this example is going to look at a resource group and a resource in our Proof Of Concept Subscription

Set-AzContext -SubscriptionId "xxxx-xxxx-xxxx-xxxx"

The ID can be generated by using Get-AzureRMSubscription

And running Get-AzureRmContext again, provides you with confirmation that you have changed subscriptions

Now lets have a look at all the resource groups within this subscription with Get-AzResourceGroup again


These are the two resource groups we are interested in. POC has no tags and training Resources have a couple of tags at resource group Level.

Get-AzureRmResource | ft

This scrips allows you to get a list of all the resources and Resource groups within the current subscription

What I want to do now is check all the tags on the resource Group

(Get-AzResource -ResourceGroupName POC_Resource_Group).Tags

This function allows us to see every tag at resource level against the Resource group. So this script doesnt quite give us what we want. We know that there are no tags at resource group level. How do we establish this with Powershell?

$resourceGroup = Get-AzResourceGroup -Name POC_Resource_Group  
Get-AzTag -ResourceId $resourceGroup.ResourceId

This script allows us so see the tags on the Resource Group.

It would now be useful to get a list of Resources in the resource Group

Get-AzureRmResource -ResourceGroupName POC_Resource_Group | ft

So now we can see every resource in the Resource group

Next step is to have a look at tags per resource

(Get-AzureRmResource -Name "AdventureWorksDW").Tags

We know what our Resources are called now (See Above) so we can get specific tags of a resource group

Scripts to Add tags to a Resource Group

It would be really good to have the following tag at resource group level

  • businessProcess, Proof of Concept
  • environmentType, Dev
  • client, na
  • billingCategory, Internal Analytics

Lets have a go with powershell

$tags = @{"businessProcesst"="Proof of Concept"; "environmentType"="Dev"; "client"="na"; "billingCategory"="Internal Analytics"}
$resourceGroup = Get-AzResourceGroup -Name POC_Resource_GroupNew-AzTag -ResourceId 
$resourceGroup.ResourceId -tag $tags

The resource group now has Tags

Scripts to add tags to a resource

Completely update the List of Tags

We also want to add a tag to a resource.

If you were to use the following script

$tags = @{"costCentre"="000000"} $resource = Get-AzResource -Name AdventureWorksDW -ResourceGroup POC_Resource_Group  
New-AzTag -ResourceId $resource.id -Tag $tags 

And then run (Get-AzureRmResource -Name “AdventureWorksDW”).Tags to look at the tags, this script deletes all the tags and inserts just the one, this isn’t the logic we want to use. We want to Add tags to a Resource that already has tags

Add Tags to a resource that already has tags

$resource = Get-AzResource -Name AdventureWorksDW -ResourceGroup POC_Resource_Group 
$tags = @{"costCentre"="000000"} 
Update-AzTag -ResourceId $resource.id -Tag $tags -Operation Merge

Instead of New, Update has been used. and we gave the script a resource name and a resource group

(Get-AzureRmResource -Name “AdventureWorksDW”).Tags shows that the new tag has been added to the previous tags

Amend a Tag

After running (Get-AzureRmResource -Name “AdventureWorksDW”).Tags, adventureworkks is a value that has been inputted incorrectly and needs amending.

$resource = Get-AzResource -Name AdventureWorksDW -ResourceGroup POC_Resource_Group 
$tags = @{"applicationName"="adventureworks"} 
Update-AzTag -ResourceId $resource.id -Tag $tags -Operation Merge

Great. The incorrect value has been updated

Get Tags

a couple more really useful Scripts in regards to tags

Get-AzureRmTag

This script allows you to see all your tags and how many times they are used within the subscription

From the above script we can see that businessProcesst is a tag that has been added which needs amending to businessProcess (Its been incorrectly typed in)

Get more information about the Tag (Tag Values and Count of Use)

Get-AzureRmTag -Name "environmentType"

This script is great for looking at the values in a specific tag. And in this case we want to know more about businessProcesst

Get-AzureRmTag -Name "businessProcesst"

And to really tie it down we want to know what resource or resource Group it belongs too?

You can run the following Script to get the Specific resource Group for the tag

(Get-AzResourcegroup -Tag @{ “businessProcesst"="Proof of Concept"}).ResourceGroupName

Its in the Proof of Concept Resource group so all that is needed is to delete and recreate

And this Script checks if its against any resources

(Get-AzResource -Tag @{ “businessProcesst"="Proof of Concept"}).Name

In this case No

Remove-AzureRmTag -Name "businessProcesst"

Although we have checked, the error message stills says that the Tag is being referenced by resources.

It may be easier to update the Tag in Azure rather than using Code. there doesnt appear to be a way of changing the tag name in poweshell (Or at least I haven’t found it yet)

You can go to tags. Click on the Tag. Then click on … at the end of the tag Row and choose Edit tags.

Then Save

This just gives a flavor of how to use powershell to manage tags. This information can be saved into Scripts so we can reproduce the creation of tags if required.

Tags applied to resource Groups don’t get added to the Resources below. Powershell gives you move control over making sure the Resources and resources Groups have the correct tags applied

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