A CloudFormation template that creates a simple EC2 instance

cfn-single-ec2-instance.yml

AWSTemplateFormatVersion: "2010-09-09"
Description: >
  This is my template that creates a simple EC2 instance

# Parameters
Parameters:
  InstanceName:
    Type: String
    Description: Name your EC2 instance - dont
  KeyPair:
    Type: AWS::EC2::KeyPair::KeyName
    Description: The KeyPair name to access the EC2 instance
  InstanceType:
    Type: String
    Description: The Type of the EC2 instance we will use
    AllowedValues:
      - t2.micro
      - t3.micro
  AMI:
    Type: AWS::EC2::Image::Id
    Description: The AMI ID to be used with our EC2 instance
    Default: ami-0c3e74fa87d2a4227

Resources:
  EC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref AMI
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyPair
      UserData:
        Fn::Base64:
          #!/bin/bash
          yum -y update
          yum -y install httpd
          service httpd start
      Tags:
        - Key: Name
          Value: !Ref InstanceName

Outputs:
  EC2InstanceIP:
    Description: The instance IP
    Value: !GetAtt EC2Instance.PublicIp