AWS CDK 2024

Case #1: API Gateway + Lambda

• 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

• 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>