“Two birds - one stone” - Building serverless apps with AWS CDK

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1. simalexan Meet Slobodan
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4. simalexan Build with serverless! Its me!
5. simalexan No server management / ops Scales per use Autofailover Don’t pay 
 for idle
6. simalexan Business is more profitable Faster delivery
7. simalexan Code needs to run on servers! Serverless? That’s not the point! You’re an idiot
8. simalexan It is serverless, 
 the same way WIFI is wireless. Gojko Adzic
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10. simalexan Ok, lets try…
11. simalexan AWS Lambda DynamoDB API Gateway AWS S3 Understanding serverless seems easy
12. simalexan Until you reach AWS CloudFormation Did I miss some space here?! Max 200 resources?? Ack, this is ugly!
13. simalexan You said it was easy, now I have to write ugly YAML… CloudFormation? There’s a better way… I’ve Wasted hours finding the docs…
14. simalexan “Two birds - one stone” Building serverless apps with AWS CDK Aleksandar Simović
15. simalexan Aleksandar Simović • Senior software engineer / Lead serverless engineer
 at ScienceExchange • Coauthor of the “Serverless Applications with Node.js” book • AWS Serverless Hero • AWS SAM / AWS SAM Lambda builders / AWS CDK • Almost 30 serverless apps on 
 AWS Serverless Application Repository • Saved more than $100k at ScienceExchange by implementing several
 serverless solutions.
16. simalexan The “agenda” • Infrastructure Management Journey • AWS CDK • Short Demo • More examples
17. simalexan In the beginning there was a console
18. simalexan Console • Easy to get started • Not reproducible • Error prone • Time Consuming
19. simalexan Scripted Resources
 (pre 2010)
20. simalexan Scripted Resources
 (pre 2010) • What if an API call fails? • How to make updates? • How do you know if a resource is ready? • How to roll back?
21. simalexan Resource Provisioning Engines • AWS CloudFormation • Terraform
 Using declarative configuration • AWS CloudFormation template (JSON/YAML) • HashiCorp Configuration Language (HCL)
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23. simalexan Resource Provisioning Engines • Easy to automate • Reproducible • Good Rollbacks and Updates • Awful syntax • No abstraction, lots of details
24. simalexan Resource Provisioning Engines • Feels like a shopping list / no programming at all • Fair abstractions using Nested Stacks • YAML formatting issues (cfn-lint) • Documentation only online
25. simalexan Document Object Models (DOMs) • Troposphere (Python) • SparkleFormation (Ruby) • GoFormation (Go)
26. simalexan Document Object Models (DOMs) • Real code • Desired state (builds upon CloudFormation) • Abstractions are not built-in
27. simalexan AWS CDK
 (Cloud Development Kit) Software Development Framework 
 Cloud Infrastructure and Applications
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30. simalexan Componentized • Application = multiple stacks • Stack = multiple constructs • Construct can have multiple levels:
 - can be a component 
 (API GW + Lambda + upload S3 bucket)
 
 - can be a single piece
 (a Lambda) • You write constructs as components
31. simalexan Language support • TypeScript • Python • Java • C#
32. simalexan How does it look like
33. simalexan What would you write?
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35. simalexan How do you start • npm install -g cdk@0.34.0 • A configured AWS account + AWS CLI
36. simalexan Demo • CDK CLI workflow • Demonstrate the workflow
37. simalexan cdk init • npm install -g aws-cdk • mkdir hello-serverless-banjaluka • cdk init app —-language=typescript
 • Setups the project, lib, bin, cdk.json, tsconfig.json
38. simalexan cdk build • Simply compiles the TypeScript files to javascript • A watch is available too
39. simalexan cdk synth • Synthesizes a template from your CDK app. • A traditional CloudFormation template • Adds AWS::CDK::Metadata to every stack.
40. simalexan cdk diff
41. simalexan cdk deploy
42. simalexan cdk destroy
43. simalexan testing? • Standard testing for your codebase • cdk synth 
 (you can test the CF output) • programmable infrastructure tests
44. simalexan stages? • Standard environment setup with your services • Different AWS accounts, belonging to an an organization • You can setup a CI/CD pipeline with AWS CDK
45. simalexan Next steps • Try out the CDK • https://cdkworkshop.com • https://awslabs.github.io/aws-cdk
 The repository is constantly evolving • https://github/awslabs/aws-cdk
46. simalexan Examples
 https://github.com/aws-samples/aws-cdk-examples A few serverless ones: • api-cors-lambda-crud-dynamodb • appsync-graphql-dynamodb • static-site • fargate-service-with-auto-scaling • … many more
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48. simalexan Questions? @simalexan serverless.pub Twitter Blog “Serverless Applications with Node.js" claudia40 40% off Thank you