Serverless Infra

Overview

This project provisions a serverless backend on AWS using Terraform. It creates an API layer, compute functions, and a database, all defined as code.

The goal is to achieve fully automated infrastructure setup, where backend services can be deployed consistently without manual configuration.

Stack

• Terraform

• AWS Lambda

• Amazon API Gateway

• Amazon DynamoDB

• IAM (roles and permissions)

Architecture

API Gateway → Lambda → DynamoDB

Terraform Configuration

Provider

provider "aws" {
  region = "ap-south-1"
}

IAM Role for Lambda

resource "aws_iam_role" "lambda_role" {
  name = "lambda-role"

  assume_role_policy = jsonencode({
    Version = "2012-10-17",
    Statement = [{
      Action = "sts:AssumeRole",
      Effect = "Allow",
      Principal = {
        Service = "lambda.amazonaws.com"
      }
    }]
  })
}

Lambda Function

resource "aws_lambda_function" "app" {
  function_name = "serverless-app"
  role          = aws_iam_role.lambda_role.arn
  handler       = "index.handler"
  runtime       = "nodejs18.x"

  filename = "function.zip"
}

API Gateway

resource "aws_api_gateway_rest_api" "api" {
  name = "serverless-api"
}

DynamoDB Table

resource "aws_dynamodb_table" "table" {
  name         = "app-table"
  billing_mode = "PAY_PER_REQUEST"
  hash_key     = "id"

  attribute {
    name = "id"
    type = "S"
  }
}

Commands

terraform init
terraform plan
terraform apply

Result

• Serverless backend created using code
  

• API endpoint connected to Lambda
  

• Data stored in DynamoDB
  

• No server management required
  

Key Points

• Infrastructure fully automated
  

• Scalable backend without servers
  

• Pay-per-use architecture
  

• Easy to modify and redeploy
  

Final Note

This project demonstrates how backend systems can be built and managed entirely through code.

It ensures infrastructure is consistent, scalable, and production-ready without manual setup.