Use User-Assigned Managed Identities for Azure Functions

01 Sign in to the Azure Management Console.

02 Navigate to All resources blade at https://portal.azure.com/#view/HubsExtension/BrowseAll to access all your Microsoft Azure cloud resources.

03 Choose the Azure subscription that you want to access from the Subscription filter box and choose Apply.

04 From the Type filter box, select Function App and choose Apply to list only the Microsoft Azure Function Apps available in the selected subscription.

05 Click on the name (link) of the Azure Function App that you want to examine.

06 In the navigation panel, under Settings, select Identity to access the identity-based settings configured for the selected Function App resource.

07 Select the User assigned tab and check for any user-assigned managed identities listed on this panel. If there are no managed identities available, the functions managed with the selected Microsoft Azure Function App are not using user-assigned managed identities.

08 Repeat steps no. 5 – 7 for each Azure Function App deployed in the selected Azure subscription.

09 Repeat steps no. 3 – 8 for each subscription created in your Microsoft Azure cloud account.

01 Run functionapp list command (Windows/macOS/Linux) using custom query filters to list the name and the associated resource group for each Azure Function App available in the current subscription:

az functionapp list 
  --output table 
  --query '[*].{name:name, resourceGroup:resourceGroup}'

02 The command output should return the requested Function App names:

Name                      ResourceGroup
----------------------    ------------------------------
cc-main-function-app      cloud-shell-storage-westeurope
cc-project5-function-app  cloud-shell-storage-westeurope

03 Run functionapp show command (Windows/macOS/Linux) using the name of the Azure Function App that you want to examine and its associated resource group as the identifier parameters to determine the identity type configured for the selected Function App resource:

az functionapp show 
  --name cc-main-function-app 
  --resource-group cloud-shell-storage-westeurope 
  --query 'identity.type'

04 The command output should return the identity type used (user-assigned or system-assigned):

"SystemAssigned"

05 Repeat step no. 3 and 4 for each Azure Function App available within the current Azure subscription.

06 Repeat steps no. 1 – 5 for each subscription created in your Microsoft Azure cloud account.

01 Sign in to the Azure Management Console.

02 Navigate to All resources blade at https://portal.azure.com/#view/HubsExtension/BrowseAll to access all your Microsoft Azure cloud resources.

03 Choose the Azure subscription that you want to access from the Subscription filter box and choose Apply.

04 From the Type filter box, select Function App and choose Apply to list only the Microsoft Azure Function Apps available in the selected subscription.

05 Click on the name (link) of the Azure Function App that you want to configure.

06 In the navigation panel, under Settings, select Identity to access the identity-based settings configured for the selected Function App resource.

07 Select the User assigned tab and choose Add from the top menu to add your user-assigned managed identity to the selected Function App resource.

08 Select your Azure subscription from the Select a subscription dropdown list and choose the user-assigned managed identity that you want to assign to your functions within the selected Azure Function App, from the User assigned managed identities list. Select the appropriate identity and choose Add to apply the changes.

09 Repeat steps no. 5 – 8 for each Azure Function App that you want to configure, deployed in the selected Azure subscription.

10 Repeat steps no. 3 – 8 for each subscription created in your Microsoft Azure cloud account.

01 Run functionapp identity assign command (OSX/Linux/UNIX) using the name of the Azure Function App that you want to configure as the identifier parameter to assign your user-assigned managed identity to the Azure functions managed with the specified Azure Function App:

az functionapp identity assign 
  --name cc-main-function-app 
  --resource-group cloud-shell-storage-westeurope 
  --identities "/subscriptions/abcd1234-abcd-1234-abcd-1234abcd1234/resourcegroups/cloud-shell-storage-westeurope/providers/Microsoft.ManagedIdentity/userAssignedIdentities/cc-function-app-managed-identity"

02 Once the assignment process is completed, the command output should return the information available for the managed identity:

{
	"principalId": null,
	"tenantId": null,
	"type": "UserAssigned",
	"userAssignedIdentities": {
		"/subscriptions/abcd1234-abcd-1234-abcd-1234abcd1234/resourcegroups/cloud-shell-storage-westeurope/providers/Microsoft.ManagedIdentity/userAssignedIdentities/cc-function-app-managed-identity": {
			"clientId": "1234abcd-abcd-1234-abcd-abcd1234abcd",
			"principalId": "abcd1234-abcd-1234-abcd-1234abcd1234"
		}
	}
}

03 Repeat steps no. 1 and 2 for each Azure Function App that you want to configure, available within the current subscription.

04 Repeat steps no. 1 – 3 for each subscription created in your Microsoft Azure cloud account.