Multi-region serverless architecture

Multi-region serverless architecture with DynamoDB Global Tables, Lambda, CloudFormation, and Serverless Framework

Architecture

This is a Serverless architecture where NestJS REST APIs are implemented in AWS Lambda connected to DynamoDB NoSQL to store data. DynamoDB Global Tables replicated in multiple regions helps us to have a mult-region architecture with high availability.

Stack

• NestJS
• AWS Lambda
• Serverless Framework
• CloudFormation
• DynamoDB Global Tables

Instructions

• Run the bash file to create a DynamoDB global table from our CloudFormation template. This creates UsersGlobalTable in region us-east-1:

./create-update-dynamodb.sh us-east-1 dynamodb-gt-mr usersGlobalTable.yml

• Create more replicas of this global table on AWS Console. Go to DynamoDB tables and select create replica in the Actions drop down to create a replica in the region of your choice.

• Use Serverless framework to deploy your Lambda function to the region of your choice

nest build && sls deploy --region <region_name>

• Repeat this for all regions you already have DynamoDB replicas. You'll get API Gateway endpoints for each region you deploy.
• Use POST method at each region to create and store a new USER object

curl -X POST -H "Content-Type:application/json" https://xxxxxx.execute-api.<region_name>.amazonaws.com/dev/user --data '{"name": "Bob", "age": 29}'

• Using GET method on the endpoint of another region, get the list of all users

curl -H "Content-Type:application/json" https://xxxxxx.execute-api.<another_region_name>.amazonaws.com/dev/user

• Confirm you are gettin the users created in other regions.