Getting sh*t done with Azure Functions (on AKS!)
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The slide deck for the talk "Getting sh*t done with Azure Functions (on AKS!) we held at Techorama NL 2019/
![DI – Migrating
35
public static class Function
{
[FunctionName(nameof(Ping))]
public static async Task<string> Ping(
[HttpTrigger(AuthorizationLevel.Function, "get"] HttpRequest req,
ILogger log,
CancellationToken cancellationToken)
{
var pingService = new PingService(log);
return await pingService.Ping(cancellationToken);
}
}
public class Function
{
private readonly IPingService _pingService;
public Function(IPingService pingService)
{
_pingService = pingService;
}
[FunctionName(nameof(Ping))]
public async Task<string> Ping(
[HttpTrigger(AuthorizationLevel.Function, "get")] HttpRequest req,
CancellationToken cancellationToken)
=> await _pingService.Ping(cancellationToken);
}](https://image.slidesharecdn.com/gsdwaf-191001092811/85/Getting-sh-t-done-with-Azure-Functions-on-AKS-34-320.jpg)
![DI – Registration
36
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
[assembly: FunctionsStartup(typeof(Startup))]
public class Startup : FunctionsStartup
{
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services.AddScoped<IPingService, PingService>();
}
}](https://image.slidesharecdn.com/gsdwaf-191001092811/85/Getting-sh-t-done-with-Azure-Functions-on-AKS-35-320.jpg)
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Getting sh*t done with Azure Functions (on AKS!)
- 2. Getting sh*t done with Azure Functions (on AKS!)
- 3. Who’s who? Daniël te Winkel Rick van den Bosch
- 4. Agenda • Introduction • Hosting platforms • Triggers & Bindings • Dependency Injection • Managed Identities • Azure Functions on AKS
- 5. Introduction
- 6. Azure Functions “Accelerate your development with an event-driven, serverless compute experience. Scale on demand and pay only for the resources you consume.”
- 7. Azure Functions • Accelerate & simplify development with Serverless compute • Improve your end-to-end development experience • Simplify complex orchestration challenges resolution • Connect other services without hard-coding integrations for faster solutions development • Choose the best hosting option for your application • Develop your way
- 10. Consumption plan • The default hosting plan • Pay only when your Functions are running • Scale out automatically • Billing is based on # of executions, execution time, and memory used • GB-s: average memory size in gigabytes * execution time in ms • Free grant: 1 million executions, 400.000 GB-s
- 11. App Service plan • Consider if you want to • Take advantage of existing, underutilized VMs • Provide a custom image to run Functions on • Enable Always On • Runtime goes idle after a few minutes • Only HTTP triggers “wake up” the Functions
- 12. Premium plan • Consider if you want to • Run function apps continuously, or nearly continuously • Have more CPU or memory options than what is provided by the Consumption plan • Run your code longer than the max. on the Consumption plan • Have features that are only available on a Premium plan (VNET/VPN) • Billing is based on the number of vCPU-s and GB-s
- 14. Premium plan – Features • Perpetually warm instances to avoid any cold start • VNet connectivity • Unlimited execution duration • Premium instance sizes (one core, two core, and four core instances) • More predictable pricing • High-density app allocation for plans with multiple function apps
- 15. Premium plan – Pre-warmed instances
- 16. Hosting Platforms AKS / Kubernetes / Docker
- 17. What is Kubernetes / AKS? • Docker: Create, deploy and run applications in Containers • Kubernetes (k8s): open source container orchestration engine for automating deployment, scaling, and management of containerized applications (e.g. Docker containers) • Azure Kubernetes Service (AKS): Managed Kubernetes in Azure 17
- 19. Deployments • Manages lifecycle of app • Across nodes 19
- 20. Pods • Unit of Deployment • One or a few Containers • Persistent volumes 20
- 21. Azure functions in AKS • Add serverless capabilities with Virtual Nodes • Scale Event driven applications with KEDA (preview) • Scale HTTP driven applications with Osiris (experimental) • Managed identity with AAD Pod Identity 21
- 22. Azure Functions in Kubernetes The good news: • Easy to write and small pieces of code • Triggers and bindings • Portable between all hosting options The not-so-good news: • You lose most of what you are used to with Azure Functions in the portal 22
- 23. Azure Functions in Kubernetes – Pitfalls • Scaling, without KEDA, does not work as expected • Host ID different per Pod • Poor fix by setting: AzureFunctionsWebHost:hostId 23
- 25. Triggers & Bindings • Triggers • cause a function to run • function must have exactly one trigger • have associated data, which is often provided as the payload of the function • Bindings • way of declaratively connecting another resource to the function • may be connected as input bindings, output bindings, or both • provide their data to the function as parameters
- 27. Dual abstraction • Azure Functions abstract away the infrastructure • Triggers & Bindings abstract away the resources you interact with
- 28. Triggers • Example: • Blob Trigger on a Consumption plan • Up to 10 minute delay Solution: • Switch to App Service plan with Always On enabled. • Use Event Grid trigger with your Blob storage account.
- 29. DEMO
- 31. Dependency Injection • Microsoft.NET.Sdk.Functions >= 1.0.28 • Constructor injection • Same as DI in ASP.Net core • Already provided services: • Microsoft.Extensions.Configuration.IConfiguration • Microsoft.Azure.WebJobs.Host.Executors.IHostIdProvider 32
- 32. DI – Scopes • Singleton – Created once, on first request, or when created before registration • Scoped – Created once per client request (connection / trigger) • Transient – Created on each request 33
- 33. DI – Extension • NuGet: Microsoft.Azure.Functions.Extensions • Makes dependency registrations a bit easier • Provides IServiceCollection on IFunctionHostBuilder 34
- 34. DI – Migrating 35 public static class Function { [FunctionName(nameof(Ping))] public static async Task<string> Ping( [HttpTrigger(AuthorizationLevel.Function, "get"] HttpRequest req, ILogger log, CancellationToken cancellationToken) { var pingService = new PingService(log); return await pingService.Ping(cancellationToken); } } public class Function { private readonly IPingService _pingService; public Function(IPingService pingService) { _pingService = pingService; } [FunctionName(nameof(Ping))] public async Task<string> Ping( [HttpTrigger(AuthorizationLevel.Function, "get")] HttpRequest req, CancellationToken cancellationToken) => await _pingService.Ping(cancellationToken); }
- 35. DI – Registration 36 using Microsoft.Azure.Functions.Extensions.DependencyInjection; using Microsoft.Extensions.DependencyInjection; [assembly: FunctionsStartup(typeof(Startup))] public class Startup : FunctionsStartup { public override void Configure(IFunctionsHostBuilder builder) { builder.Services.AddScoped<IPingService, PingService>(); } }
- 36. DEMO 37
- 37. Managed Identities a.k.a. Managed Service Identifier
- 38. Managed Identities for Azure resources • Provide Azure services with a managed identity in Azure AD • Use the identity to authenticate to any service (that supports Azure AD authentication)
- 39. Supporting services “We are in the process of integrating managed identities for Azure resources and Azure AD authentication across Azure.” • Azure Resource Manager • Azure Key Vault • Azure Data Lake • Azure SQL • Azure Event Hub • Azure Service Bus • Azure Storage blobs and queues • Azure Analysis Services
- 40. DEMO
- 42. Questions? [email protected] [email protected] @daniel_teWinkel @rickvdbosch Find us at the Betabit booth
Editor's Notes
- #4: After intro: who has worked with Azure Functions? Who has worked with Kubernetes/AKS?
- #11: GB-s: Gigabyte seconds Memory used by a function is measured by rounding up to the nearest 128 MB, up to the maximum memory size of 1,536 MB, With execution time calculated by rounding up to the nearest 1 ms. Minimum: 100 ms and 128 mb
- #12: Also: dedicated plan
- #14: Regardless of the function app timeout setting, 230 seconds is the maximum amount of time that an HTTP triggered function can take to respond to a request.
- #16: Images are from a Serverless360.com blog post, and aren’t available without Jeff Hollan and Alex Karcher 🤣
- #17: https://phippy.io/
- #19: Images taken from Kubernetes site: https://kubernetes.io/docs/tutorials/kubernetes-basics/
- #22: AAD Pod Identity
- #24: E.g. manual scaling or scaling using HPA (Horizontal Pod Autoscaler)
- #45: monitors the rate of events and determines whether to scale out or scale in Heuristics for each trigger type For example, when you're using an Azure Queue storage trigger, it scales based on the queue length and the age of the oldest queue message.
- #46: For the first bullet: A single instance may process more than one message or request at a time though, so there isn't a set limit on number of concurrent executions.