AWS CDK in Practice
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This document discusses the AWS Cloud Development Kit (CDK) which allows defining AWS infrastructure as code using regular programming languages. It introduces CDK concepts like stacks, constructs, and the CDK workflow. The rest of the document demonstrates CDK through examples like creating a S3 bucket, developing custom constructs, and unit testing CDK apps. Benefits of CDK are reusable infrastructure defined as code that can be version controlled, tested, and shared as libraries.
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AWS CDK in Practice
- 1. connect DevAx connect DevAx AWS CDK 기초부터 활용까지 @prorhap 최 철 우 Startup Solutions Architect, DevAx
- 2. connect DevAx Agenda • Our Infrastructure Management Journey • AWS Cloud Development Kit • Hello CDK • Demo – Writing CDK App • Demo – Custom Construct • Demo – Writing Test • More about CDK
- 3. connect DevAx Web Console 👍 Easy to get started 🤔 Not reproducible 🤔 Error prone 🤔 Time consuming
- 4. connect DevAx Scripted 🤔 What happens if an API call fails? 🤔 How do I make updates? 🤔 How do I know a resource is ready? 🤔 How do I roll back?
- 5. connect DevAx Provisioning engines AWS CloudFormation template (JSON/YAML) Desired state configuration HashCorp Configuration Language Ansible Playbook 👍 Easy to automate 👍 Reproducible 😩 Configuration syntax 😩 No abstraction, lots of details
- 6. connect DevAx Infrastructure is code (in your favorite programming language) with the AWS CDK
- 7. connect DevAx AWS CDK AWS CloudFormation template AWS CDK application Stack(s) Construct Construct Resources
- 10. connect DevAx CDK Prerequisites and Installation Install AWS CDK Toolkit $ npm install –g aws-cdk CDK Version $ cdk --version
- 11. connect DevAx Hello CDK $ mkdir hello-cdk $ cd hello-cdk $ cdk init app --language typescript Note: “cdk init” has the following syntax: cdk init TEMPLATE --language LANGUAGE
- 12. connect DevAx Hello CDK $ npm install @aws-cdk/aws-s3 writing code …
- 13. connect DevAx Hello CDK $ npm run build $ cdk synth
- 14. connect DevAx Hello CDK $ cdk diff $ cdk deploy
- 15. connect DevAx CDK workflow cdk bootstrap - Deploys the CDK toolkit stack into an AWS environment cdk init - Create a new CDK project Add the constructs your code needs e.g. npm install @aws-cdk/aws-lambda @aws-cdk/aws-apigateway Compile your code if needed e.g. npm run build cdk synth - Synthesizes and prints the CloudFormation template for the stack cdk deploy - Deploys the stack(s) into your AWS account cdk destroy - Destroy the stack(s)
- 17. connect DevAx 3 Levels of Constructs 1. L1 constructs are the resources defined by CloudFormation • For example, CfnBucket class represents the AWS::S3::Bucket CFN Resource. 2. L2 constructs have higher-level, intent-based API. Same functionality, but handle much of the details, boilerplate, convenient default • For example, the Bucket class represents an Amazon S3 bucket with additional properties and methods, such as bucket.addLifeCycleRule 3. Even higher-level constructs, which called pa#erns. Common tasks in AWS, often involving multiple kinds of resources.
- 18. connect DevAx Stacks The unit of deployment in the AWS CDK is called a stack. const app = new cdk.App(); new MyFirstStack(app, "stack1"); new MySecondStack(app, "stack2"); cdk ls stack1 stack2 cdk synth stack1 To list all the stacks in the app use “cdk ls” command: To deploy specific stack provide stack name for “cdk synth” command:
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- 28. connect DevAx Unit Testing • Snapshot tests test the synthesized AWS CloudFormation template against a previously-stored baseline template • Fine-grained assertions test specific aspects of the generated AWS CloudFormation template, such as "this resource has this property with this value.” • Validation tests help you "fail fast" by making sure your AWS CDK constructs raise errors when you pass them invalid data.
- 29. connect DevAx Unit Testing • Use Jest testing framework • $ npm install --save-dev jest @types/jest @aws-cdk/assert • $ npm test
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- 32. connect DevAx Construct library AWS Lambda Amazon API Gateway AWS DynamoDB AWS Step Functions Amazon CloudWatch Metrics, alarms, dashboards AWS CodePipeline AWS Auto Scaling Amazon EC2 VPCs, security groups, Auto Scaling ……
- 33. connect DevAx AWS Solutions Constructs A Library of Architecture Patterns for the AWS CDK import { KinesisStreamsToKinesisFirehoseToS3 } from '@aws-solutions-constructs/aws-kinesisstreams-kinesisfirehose-s3’; new KinesisStreamsToKinesisFirehoseToS3(this, 'test-stream-firehose-s3', {}); link
- 35. connect DevAx Useful links • AWS CDK: github.com/aws/aws-cdk • CDK Roadmap: github.com/orgs/aws/projects/7 • cdkworkshop.com • github.com/aws-samples/aws-cdk-examples • cdk.dev • aws.amazon.com/ko/solutions/constructs • cdkpatterns.com
- 36. connect DevAx Benefits of CDK • Use logic (if statements, for-loops, etc.) when defining your infrastructure • Use object-oriented techniques to create a model of your system • Define high level abstractions, share them • Reuse your infrastructure as a library • Use your existing code review workflow • Provide test framework • Code completion within your IDE