template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: Simple CloudFormation template to deploy an EC2 web server

Parameters:
  KeyName:
    Description: EC2 KeyPair for SSH access
    Type: AWS::EC2::KeyPair::KeyName

Resources:
  WebServerSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Allow HTTP and SSH
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: 80
          ToPort: 80
          CidrIp: 0.0.0.0/0

  WebServerInstance:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: t2.micro
      KeyName: !Ref KeyName
      ImageId: ami-0c02fb55956c7d316  # Amazon Linux 2 (us-east-1)
      SecurityGroupIds:
        - !Ref WebServerSecurityGroup
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          yum install -y httpd
          systemctl start httpd
          systemctl enable httpd
          echo "<h1>Deployed with CloudFormation 🚀</h1>" > /var/www/html/index.html

Outputs:
  WebsiteURL:
    Description: URL of the web server
    Value: !Sub "http://${WebServerInstance.PublicDnsName}"