Custom Domains & ALB Integration - AWS Serverless

Introduction

This lesson covers integrating a custom domain name with AWS API Gateway and an Application Load Balancer (ALB) in a serverless architecture. This setup allows you to route traffic intelligently and enhance user experience.

Key Concepts

• **Custom Domain**: A domain name that you own and want to use to access your API.
• **API Gateway**: A fully managed service that enables you to create, publish, maintain, monitor, and secure APIs at any scale.
• **Application Load Balancer (ALB)**: A Layer 7 load balancer that routes HTTP and HTTPS traffic to targets based on rules.
• **SSL/TLS Certificates**: Used to secure your domain and API traffic.

Step-by-Step Setup

1. Set Up Your Domain

   aws route53 create-hosted-zone --name example.com --caller-reference unique-string

2. Create SSL Certificate

   aws acm request-certificate --domain-name example.com --validation-method DNS

3. Configure API Gateway

   aws apigateway create-domain-name --domain-name api.example.com --certificate-arn arn:aws:acm:region:account-id:certificate/certificate-id

4. Create a Base Path Mapping

   aws apigateway create-base-path-mapping --domain-name api.example.com --rest-api-id api-id --stage stage-name

5. Set Up ALB

   aws elbv2 create-load-balancer --name my-load-balancer --subnets subnet-abc12345 --security-groups sg-abc12345

6. Update Route 53 Records

   aws route53 change-resource-record-sets --hosted-zone-id Z1PA6795UKMFR9 --change-batch file://change-batch.json

Best Practices

• Use Route 53 for DNS management for seamless integration with AWS services.
• Ensure your SSL certificates are always up-to-date to maintain security.
• Monitor your API Gateway and ALB performance using AWS CloudWatch.
• Implement caching strategies in API Gateway to reduce latency.

FAQ