dotnet-aspire
.NET Aspire for cloud-native app orchestration, service discovery, telemetry, and component integrations
What this skill does
# .NET Aspire
## What is Aspire?
.NET Aspire is an opinionated, cloud-ready stack for building observable, production-ready, distributed applications. It provides:
- **Orchestration** - Coordinate multi-service apps with AppHost
- **Components** - Pre-configured NuGet packages for common services (Redis, PostgreSQL, RabbitMQ, etc.)
- **Tooling** - Dashboard for logs, traces, metrics; CLI for management
- **Service Defaults** - Shared configuration for health checks, telemetry, resilience
## AppHost (Orchestrator)
```csharp
// MyApp.AppHost/Program.cs
var builder = DistributedApplication.CreateBuilder(args);
// Infrastructure resources
var postgres = builder.AddPostgres("postgres").WithDataVolume().WithPgAdmin();
var redis = builder.AddRedis("redis").WithRedisInsight();
var rabbitmq = builder.AddRabbitMQ("messaging").WithManagementPlugin();
// Databases
var appDb = postgres.AddDatabase("appdb");
// Projects (services)
var api = builder.AddProject<Projects.Api>("api")
.WithReference(appDb)
.WithReference(redis)
.WithReference(rabbitmq)
.WithExternalHttpEndpoints();
var web = builder.AddProject<Projects.Web>("web")
.WithReference(api)
.WithReference(redis)
.WithExternalHttpEndpoints();
var worker = builder.AddProject<Projects.Worker>("worker")
.WithReference(rabbitmq)
.WithReference(appDb);
builder.Build().Run();
```
## Service Defaults
```csharp
// ServiceDefaults/Extensions.cs (shared project)
public static IHostApplicationBuilder AddServiceDefaults(this IHostApplicationBuilder builder)
{
builder.ConfigureOpenTelemetry();
builder.AddDefaultHealthChecks();
builder.Services.AddServiceDiscovery();
builder.Services.ConfigureHttpClientDefaults(http =>
{
http.AddStandardResilienceHandler();
http.AddServiceDiscovery();
});
return builder;
}
```
## Component Integrations
| Component | NuGet Package | AddXxx Method |
|-----------|--------------|---------------|
| PostgreSQL (EF) | `Aspire.Npgsql.EntityFrameworkCore.PostgreSQL` | `AddNpgsqlDbContext<T>()` |
| SQL Server (EF) | `Aspire.Microsoft.EntityFrameworkCore.SqlServer` | `AddSqlServerDbContext<T>()` |
| Redis Cache | `Aspire.StackExchange.Redis.DistributedCaching` | `AddRedisDistributedCache()` |
| Redis Output Cache | `Aspire.StackExchange.Redis.OutputCaching` | `AddRedisOutputCache()` |
| RabbitMQ | `Aspire.RabbitMQ.Client` | `AddRabbitMQClient()` |
| Azure Service Bus | `Aspire.Azure.Messaging.ServiceBus` | `AddAzureServiceBusClient()` |
| Azure Blob Storage | `Aspire.Azure.Storage.Blobs` | `AddAzureBlobClient()` |
| Cosmos DB | `Aspire.Microsoft.Azure.Cosmos` | `AddAzureCosmosClient()` |
## Dashboard
The Aspire dashboard provides:
- **Structured logs** from all services
- **Distributed traces** across service boundaries
- **Metrics** (request rates, latencies, error rates)
- **Resource status** and health checks
Access at: `https://localhost:18888` (default)
## Deployment
```bash
# Deploy to Azure Container Apps
azd init
azd provision # Creates Azure resources
azd deploy # Deploys all services
# Or use Aspire CLI
aspire publish --publisher azure
```
## Key Patterns
- Every service project calls `builder.AddServiceDefaults()`
- Use `WithReference()` to establish service dependencies
- Use `WithExternalHttpEndpoints()` for publicly accessible services
- Service discovery uses `https+http://service-name` URIs
- All telemetry is automatically correlated across services
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