{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Description" : "A sample EC2 instance template for testing change sets.",
  "Parameters" : {
    "Purpose" : {
      "Type" : "String",
      "Default" : "testing",
      "AllowedValues" : ["testing", "production"],
      "Description" : "The purpose of this instance."
    },
    "KeyPairName" : {
      "Type": "AWS::EC2::KeyPair::KeyName",
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instance"
    },
    "InstanceType" : {
      "Type" : "String",
      "Default" : "t2.micro",
      "AllowedValues" : ["t2.micro", "t2.small", "t2.medium"],
      "Description" : "The EC2 instance type."
    }
  },
  "Resources" : {
    "MyEC2Instance" : {
      "Type" : "AWS::EC2::Instance",
      "Properties" : {
        "KeyName" : { "Ref" : "KeyPairName" },
        "InstanceType" : { "Ref" : "InstanceType" },
        "ImageId" : "ami-8fcee4e5",
        "Tags" : [
          {
            "Key" : "Purpose",
            "Value" : { "Ref" : "Purpose" }
          }
        ]
      }
    }
  }
}