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AWS CDK 2024

Case #1: API Gateway + Lambda

AWS Lambda Architecture

  • VPC + 3 subnets (public, private, isolated)
  • Cognito
  • RDS Aurora Postgres + Proxy
  • API Gateway HTTP
  • Lambda
  • Secrets Manager
  • SSM Parameter Store

Case #2: ECS Fargate Containers + ALB

AWS ECS Containers Architecture

  • VPC + 3 subnets (public, private, isolated)
  • Cognito
  • RDS Aurora Postgres + Proxy
  • ALB
  • ECS Fargate (ARM) + ECR + Auto-Scaling
  • Secrets Manager
  • SSM Parameter Store

🚀 Deployment

npm i -g aws-cdk
npm i
cdk bootstrap
cdk deploy vpc
cdk deploy acm
cdk deploy cognito
cdk deploy db
cdk deploy api

Getting Started

  1. Install AWS CDK

    npm i -g aws-cdk
    cdk --version
  2. Initialize a new project

    cdk init app --language typescript
    npm i esbuild

    Note: esbuild - used to build Node.js Lambda functions

  3. Bootstrap the AWS environment

    cdk bootstrap
  4. Deploy the stack

    cdk deploy --all

    or

    cdk deploy api

File Structure

  • bin - Entry point
  • lib - Stacks and Constructs
  • helpers - Reusable code
  • functions - Lambda functions
    • api-chats - Lambda function for API Gateway
    • shared - Shared code between functions

Useful AWS CLI Commands

  • Change Cognito user password

    aws cognito-idp admin-set-user-password \
       --user-pool-id <XXX> \
       --region <XXX> \
       --username <XXX> \
       --password <XXX> \
       --permanent
  • Get Cognito user JWT token

    aws cognito-idp initiate-auth \
       --client-id <XXX> \
       --region <XXX> \
       --auth-flow USER_PASSWORD_AUTH \
       --auth-parameters USERNAME=<XXX>,PASSWORD=<XXX>