Exam AZ-400: Use tagging to organize resources

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You’ve gone through your resources and moved them into resource groups that are more organized than before. But what if resources have multiple uses? How do you better search, filter, and organize these resources? Tags can be helpful as you look to improve organization of your Azure resources.

What are tags?

Tags are name/value pairs of text data that you can apply to resources and resource groups. Tags allow you to associate custom details about your resource, in addition to the standard Azure properties a resource has the following properties:

  • department (like finance, marketing, and more)
  • environment (prod, test, dev)
  • cost center
  • life cycle and automation (like shutdown and startup of virtual machines)
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A resource can have up to 50 tags. The name is limited to 512 characters for all types of resources except storage accounts, which have a limit of 128 characters. The tag value is limited to 256 characters for all types of resources. Tags aren’t inherited from parent resources. Not all resource types support tags, and tags can’t be applied to classic resources.

Tags can be added and manipulated through the Azure portal, Azure CLI, Azure PowerShell, Resource Manager templates, and through the REST API. For example, to add a resource tag to a virtual network using the Azure CLI, you could use the following command:Azure CLICopy

az resource tag --tags Department=Finance \
    --resource-group msftlearn-core-infrastructure-rg \
    --name msftlearn-vnet1 \
    --resource-type "Microsoft.Network/virtualNetworks"

You can use Azure Policy to automatically add or enforce tags for resources your organization creates based on policy conditions that you define. For example, you could require that a value for the Department tag is entered when someone in your organization creates a virtual network in a specific resource group.

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Apply tags to resources

Let’s apply some tags to the resources you created. Recall that you created a resource group msftlearn-core-infrastructure-rg and two virtual networks inside that resource group, msftlearn-vnet1 and msftlearn-vnet2. The names of the virtual networks are relatively generic, so you’d like to associate the virtual networks with services from different departments.

Use tags for organization

The above exercise is just one example of where and how you can use tags to organize your resources. With their flexibility, there are several ways you can use tags to your advantage:

You can use tags to group your billing data. For example, if you’re running multiple VMs for different organizations, use the tags to group usage by cost center. You can also use tags to categorize costs by runtime environment, such as the billing usage for VMs running in the production environment. When you export billing data or access it through billing APIs, tags are included as part of the data and can be used to further slice your data from a cost perspective.

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You can retrieve all the resources in your subscription that have a specific tag name or value. Tags enable you to retrieve related resources from different resource groups, as well. This approach is helpful when you need to organize resources for billing or management.

Tagging resources can also help in monitoring to track down impacted resources. Monitoring systems can use tag data with alerts, giving you the ability to know exactly who is impacted. In our example above, you applied the Department tag with a value of Finance to the msftlearn-vnet1 resource. If an alarm was thrown on msftlearn-vnet1 and the alarm included the tag, you’d know that the finance department may be impacted by the condition that triggered the alarm. This contextual information can be valuable if an issue occurs.

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It’s also common for tags to be used in automation. If you want to automate the shutdown and startup of virtual machines in development environments during off-hours to save costs, you can use tags to support automation. Add a shutdown:6PM and startup:7AM tag to the virtual machines, then create an automation job that looks for these tags, and shuts them down or starts them up based on the tag value. There are several solutions in the Azure Automation Runbooks Gallery that use tags in a similar manner to accomplish this result.

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