Failover routing with serverless stack

This is example for creating stacks of failover rouging.

Directory Structure

packages
 ├── backend // simple lambda function
 └── cdk // cdk stacks

Stacks and Architecture

• api-gateway
• lambda
• route53
• certificatemanager

Features

• Basically lambda on ap-northeast-1 return a response when calling the api
• Once some errors are occured on ap-northeast-1, lambda on ap-northeast-3 will return a response.

Getting Started

$ cd packages/cdk
$ yarn
# Need to prepare some configures on `packages/cdk/lib/config.ts` before you run the script below
$ yarn run cdk deploy '*' 
# if you want to deploy all stacks at once, 
# otherwise you need to deploy a stack one by one

How to reproduce failover and what stacks behave

• Return error code or just throw error on packages/backend/src/tokyo.js (Fixing the code on AWS console is easy)
• HealthCheck on route53 will show failing status
• 30~60 seconds later, the api will return a response from packages/backend/src/osaka.js
• packages/backend/src/osaka.js will return it unless packages/backend/src/tokyo.js return successful response