Day 48: Automating Infrastructure Deployment with AWS CloudFormation

Welcome to Day 48. Today we will learn how to automating Infrastructure depoloyment with AWS CloudFormation.

What is AWS CloudFormation?

AWS CloudFormation is an Infrastructure as Code (IaC) service that allows you to model, provision, and manage your AWS resources by writing a declarative template.

Instead of manually clicking through the AWS Console to create servers, databases, or networking components, you define your entire infrastructure in a JSON or YAML file. CloudFormation then acts as the "architect," reading your plan and building the resources in the correct order.

Core Concepts

• Template: A text file (YAML or JSON) that serves as the blueprint for your infrastructure. It defines what resources you want (e.g., an EC2 instance or an S3 bucket) and their configurations.

• Stack: When CloudFormation processes a template, it creates a "Stack." This is a single unit of managed resources. If you delete the stack, all resources defined in the template are deleted together.

• Change Sets: Before updating a live environment, you can generate a Change Set. This allows you to see a preview of how proposed changes will impact your running resources before you apply them.

AWSTemplateFormatVersion: '2010-09-09'
Description: CloudFormation template to create a Lambda function and IAM role.

Resources:
  # IAM Role for Lambda Execution
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: lambda_execution_role
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  # Lambda Function
  XfusionLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: xfusion-lambda
      Handler: index.lambda_handler
      Runtime: python3.9
      Role: !GetAtt LambdaExecutionRole.Arn
      Code:
        ZipFile: |
          import json

          def lambda_handler(event, context):
              message = "Welcome to KKE AWS Labs!"
              print(message)
              return {
                  'statusCode': 200,
                  'body': json.dumps(message)
              }

Outputs:
  LambdaArn:
    Description: ARN of the created Lambda function.
    Value: !GetAtt XfusionLambdaFunction.Arn

aws cloudformation validate-template --template-body file:///root/xfusion-lambda.yml

aws cloudformation create-stack --stack-name xfusion-lambda-app --template-body file:///root/xfusion-lambda.yml --capabilities CAPABILITY_NAMED_IAM

Congratulations you did it. It looks good. This lab was successfully completed without any errors. See you in day 49. If you have any issues please let me know I will be happy to assist you. Stay tuned and learn together. If you find my article useful, please kindly like and share it.