User-assigned managed identity

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This article is the reference for the Aspire Azure user-assigned managed identity (UMI) support. It enumerates the AppHost APIs — with examples for both AppHost.cs and apphost.mts — that you use to add, reference, and assign roles to user-assigned managed identities in your AppHost project.

A user-assigned managed identity is a standalone Azure resource that you assign to one or more Azure service resources, giving you explicit control over identity management and resource access.

Add a user-assigned managed identity

To create a new user-assigned managed identity, use the AddAzureUserAssignedIdentity (or addAzureUserAssignedIdentity) API:

TypeScript
C#

import { createBuilder } from './.aspire/modules/aspire.mjs';

const builder = await createBuilder();

const sharedMi = await builder.addAzureUserAssignedIdentity("custom-umi");

// After adding all resources, run the app...
await builder.build().run();

var builder = DistributedApplication.CreateBuilder(args);

var sharedMi = builder.AddAzureUserAssignedIdentity("custom-umi");

// After adding all resources, run the app...
builder.Build().Run();

The preceding code creates a new managed identity named "custom-umi" that you can use with other resources in your application.

Reference an existing managed identity

If you already have a managed identity, reference it using the PublishAsExisting (or publishAsExisting) method. This is useful when you want to use an identity created outside of your Aspire project:

TypeScript
C#

import { createBuilder } from './.aspire/modules/aspire.mjs';

const builder = await createBuilder();

const miName = await builder.addParameter("miName");
const miResourceGroup = await builder.addParameter("miResourceGroup");

const sharedMi = await builder.addAzureUserAssignedIdentity("custom-umi");
await sharedMi.publishAsExisting(miName, miResourceGroup);

// After adding all resources, run the app...
await builder.build().run();

var builder = DistributedApplication.CreateBuilder(args);

var miName = builder.AddParameter("miName");
var miResourceGroup = builder.AddParameter("miResourceGroup");

var sharedMi = builder.AddAzureUserAssignedIdentity("custom-umi")
    .PublishAsExisting(miName, miResourceGroup);

// After adding all resources, run the app...
builder.Build().Run();

In the preceding example, parameters supply the name and resource group of the existing identity so the AppHost references it rather than creating a new one.

Assign roles to managed identities

Grant Azure roles to your managed identity using the WithRoleAssignments (or withRoleAssignments) API, giving the identity access to other Azure resources:

TypeScript
C#

import { createBuilder, AzureKeyVaultRole } from './.aspire/modules/aspire.mjs';

const builder = await createBuilder();

const sharedMi = await builder.addAzureUserAssignedIdentity("custom-umi");

const secrets = await builder.addAzureKeyVault("secrets");
await sharedMi.withRoleAssignments(secrets, [AzureKeyVaultRole.KeyVaultSecretsUser]);

// After adding all resources, run the app...
await builder.build().run();

var builder = DistributedApplication.CreateBuilder(args);

var sharedMi = builder.AddAzureUserAssignedIdentity("custom-umi");

builder.AddAzureKeyVault("secrets")
    .WithRoleAssignments(sharedMi, KeyVaultBuiltInRole.KeyVaultSecretsUser);

// After adding all resources, run the app...
builder.Build().Run();

In the preceding example, the managed identity is granted the KeyVaultSecretsUser role on the Key Vault resource.