Serverless technology is trending, but in-depth details are missing. How does it fit with non-serverless components? What are the practical use cases? Should you fight vendor lock-in? And what about limits and pitfalls with Azure? I will answer those questions, share a few tricks and short demo. I'll cover serverless usage scenarios with Azure, what problems can be solved, and what is a viable adoption strategy. Then I'm going to talk about technology shortcomings, when to omit it and how to rip all benefits. There are circumstances when a cloud-agnostic approach is beneficial, so I discuss serverless frameworks too and why vendor lock is not that bad. Finally, we'll look at a short demo that illustrates why you have to use specific serverless patterns.

1. Тема доклада
Тема доклада
Тема доклада
KYIV 2019
Stas Lebedenko
Practical serverless use cases in Azure.
.NET CONFERENCE #1 IN UKRAINE

2. The ultimate goal is to
minimize the lifetime cost of
the system and to maximize
programmer productivity.
@martinfowler

3. ● Azure Functions
● Azure API Management
● Azure Logic Apps
● Azure SQL Serverless
● Azure Event Grid
● KEDA - Kubernetes-based
event-driven autoscale

4. Most popular use cases.

5. Functions cold start

6. Usage with classic
applications

7. The catch with legacy
01 | Cannot handle spike loads.
02 | Caching is a must.
03 | Rate limit via API Facades.
04 | Adjust outgoing throughput.
05 | Limit scalability.
06 | Tune connection pool of SQL Server.

8. Client applications
● Implement retry.
● Track connection issues.
● Handle 50x and 40x.
● Use additional responses
429 - Too many requests
420 - Enhance your calm

10. Serverless API facades
Azure Functions Proxy Azure API Management
VS

11. Serverless Web App

12. Serverless API

13. Stateless actors

14. Event-driven
applications

15. Durable functions
01 | Based on Durable Task Framework.
02 | Stateful coordination.
03 | Partially in preview.
04 | Orchestrator function.
05 | Entity function.
06 | Ideal for complex
Coordinated pipelines.

16. IoT Hub message pipelines

17. Event processing pipelines

18. ETL via Fan-in => Fan-out

19. Big Data pipelines

20. Durable orchestration

21. Serverless best
practices and pitfalls

22. Best practices
01 | Keep function small and stateless.
02 | Control connection limits.
03 | Design for failure and use throttling.
04 | Avoid long runs and direct chaining.
05 | Use HttpClient via static.
06 | Use scalable storages.
07 | Build communications via queues and hubs.

23. Pitfalls
01 | Consumption compute slow
02 | Scale-out have limits.
03 | Bad fit with legacy.
04 | Cold start.
06 | Cloud vendor lock-in.
07 | Failure at scale.

24. Know your limits
01 | Functions connections limits.
02 | Processing time limit.
03 | External rate limits.
04 | Scale-out limit.
05 | ACU per instance limit.
06 | Storage limit.

25. SECURITY ● Function code auth.
● 5 App Service options.
● No custom OIDC option.
● CSP, CORS settings.
● Azure Managed Identity.
● VNet only in Premium
plan.

26. Just a few tricks
Premium scaler

27. Massive scale increase
probability of the
massive failure.

28. ● Consumption plan is cheap
● Billing estimation is
complicated.
● Cheapest possible ETL.
● Long running functions
with poor design will result
in excessive cost.
● Vulnerable for Denial-of-
wallet attacks.

29. Cloud-agnostic
serverless

30. Any platform, any cloud?
01 | Vendor lock-in problem.
02 | Multicloud is a tech debt.
03 | Consider local run option.
04 | Storage is the real problem.
05 | Think in terms of code.
06 | Estimate multi cloud.

31. Pulumi framework

32. Serverless framework

33. Wrap-up

34. Demo. Your rate prediction.

35. Ask Zoltar

36. Keep up with technology

37. Questions?
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