LocalstackSetup.txt

Getting Started with LocalStack
Install Docker (if not already installed).
Install LocalStack:
pip install localstack

Or use Docker directly:
docker run -d -p 4566:4566 -p 4571:4571 localstack/localstack

Install AWS CLI and configure it:
aws configure

Use dummy credentials (LocalStack doesn’t validate them).
Set AWS Endpoint to LocalStack:
--endpoint-url=http://localhost:4566

Example PoC: Order Processing Workflow
We’ll simulate an order processing flow:
API receives an order and places it into an SQS queue.
A Lambda function polls the queue and stores the order into DynamoDB.
Step 1: Create SQS Queue
aws --endpoint-url=http://localhost:4566 sqs create-queue --queue-name order-queue

Step 2: Create DynamoDB Table
aws --endpoint-url=http://localhost:4566 dynamodb create-table \
  --table-name Orders \
  --attribute-definitions AttributeName=orderId,AttributeType=S \
  --key-schema AttributeName=orderId,KeyType=HASH \
  --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

Step 3: Write and Deploy Lambda Function
Use localstack-lambda or a Docker-based tool to deploy your Lambda function that:
Pulls messages from SQS
Writes to DynamoDB
Step 4: Trigger the Flow
aws --endpoint-url=http://localhost:4566 sqs send-message \
  --queue-url http://localhost:4566/000000000000/order-queue \
  --message-body '{"orderId": "123", "item": "Book"}'

Step 5: Verify in DynamoDB
Query the Orders table locally:
aws --endpoint-url=http://localhost:4566 dynamodb scan --table-name Orders