gistfile1.txt

{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "Sample Amazon Linux x86_64 using CloudFormation",

  "Parameters" : {

    "KeyName" : {
      "Description" : "some-key",
      "Type" : "String"
    }
  },

  "Mappings" : {
    "RegionMap" : {
      "us-east-1" : { "64" : "ami-1b814f72" }
    }
  },

  "Resources" : {

    "Ec2Instance" : {
      "Type" : "AWS::EC2::Instance",
      "Properties" : {
        "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "64" ]},
        "SecurityGroups" : [ "cloudfoundry" ],
        "KeyName" : { "Ref" : "KeyName" },
        "InstanceType" : "m1.large"
      }
    }
  },

  "Outputs" : {
    "InstanceId" : {
      "Value" : { "Ref" : "Ec2Instance" },
      "Description" : "Instance Id of newly created instance"
    }
  }
}