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

  "Description" : "AWS CloudFormation Sample Template EC2ChooseAMI: Example to show how to chose an AMI based on the region and the architecture type. **WARNING** This template creates an Amazon EC2 instance. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {
    "InstanceType" : {
      "Description" : "WebServer EC2 instance type",
      "Type" : "String",
      "Default" : "m1.small",
      "AllowedValues" : [ "t1.micro","m1.small","m1.medium","m1.large","m1.xlarge","m2.xlarge","m2.2xlarge","m2.4xlarge","m3.xlarge","m3.2xlarge","c1.medium","c1.xlarge","cc1.4xlarge","cc2.8xlarge","cg1.4xlarge"],
      "ConstraintDescription" : "must be a valid EC2 instance type."
    },

    "KeyName": {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the web server",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "255",
      "AllowedPattern" : "[\\x20-\\x7E]*",
      "ConstraintDescription" : "can contain only ASCII characters."
    },
    
    "SSHLocation" : {
      "Description" : "The IP address range that can be used to SSH to the EC2 instances",
      "Type": "String",
      "MinLength": "9",
      "MaxLength": "18",
      "Default": "0.0.0.0/0",
      "AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
      "ConstraintDescription": "must be a valid IP CIDR range of the form x.x.x.x/x."
   }
  },

  "Mappings" : {
    "AWSInstanceType2Arch" : {
      "t1.micro"    : { "Arch" : "64" },
      "m1.small"    : { "Arch" : "64" },
      "m1.medium"   : { "Arch" : "64" },
      "m1.large"    : { "Arch" : "64" },
      "m1.xlarge"   : { "Arch" : "64" },
      "m2.xlarge"   : { "Arch" : "64" },
      "m2.2xlarge"  : { "Arch" : "64" },
      "m2.4xlarge"  : { "Arch" : "64" },
      "m3.xlarge"   : { "Arch" : "64" },
      "m3.2xlarge"  : { "Arch" : "64" },
      "c1.medium"   : { "Arch" : "64" },
      "c1.xlarge"   : { "Arch" : "64" },
      "cc1.4xlarge" : { "Arch" : "64HVM" },
      "cc2.8xlarge" : { "Arch" : "64HVM" },
      "cg1.4xlarge" : { "Arch" : "64HVM" }
    },

    "AWSRegionArch2AMI" : {
      "us-east-1"      : { "32" : "ami-31814f58", "64" : "ami-1b814f72", "64HVM" : "ami-0da96764" },
      "us-west-2"      : { "32" : "ami-38fe7308", "64" : "ami-30fe7300", "64HVM" : "NOT_YET_SUPPORTED" },
      "us-west-1"      : { "32" : "ami-11d68a54", "64" : "ami-1bd68a5e", "64HVM" : "NOT_YET_SUPPORTED" },
      "eu-west-1"      : { "32" : "ami-973b06e3", "64" : "ami-953b06e1", "64HVM" : "NOT_YET_SUPPORTED" },
      "ap-southeast-1" : { "32" : "ami-b4b0cae6", "64" : "ami-beb0caec", "64HVM" : "NOT_YET_SUPPORTED" },
      "ap-southeast-2" : { "32" : "ami-b3990e89", "64" : "ami-bd990e87", "64HVM" : "NOT_YET_SUPPORTED" },
      "ap-northeast-1" : { "32" : "ami-0644f007", "64" : "ami-0a44f00b", "64HVM" : "NOT_YET_SUPPORTED" },
      "sa-east-1"      : { "32" : "ami-3e3be423", "64" : "ami-3c3be421", "64HVM" : "NOT_YET_SUPPORTED" }
    }
  },

  "Resources" : {
    "Ec2Instance" : {
      "Type" : "AWS::EC2::Instance", 
      "Properties" : {
        "ImageId" : { "Fn::FindInMap" : [ "AWSRegionArch2AMI", { "Ref" : "AWS::Region" }, 
                                          { "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "InstanceType" }, "Arch" ] } ] },
        "KeyName" : { "Ref" : "KeyName" },
        "InstanceType" : { "Ref" : "InstanceType" },
        "SecurityGroups" : [{ "Ref" : "Ec2SecurityGroup" }]
      }
    },

    "Ec2SecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "HTTP and SSH access",
        "SecurityGroupIngress" : [ {
          "IpProtocol" : "tcp", 
          "FromPort" : "22", "ToPort" : "22", 
          "CidrIp" : { "Ref" : "SSHLocation"}
        } ]
      }
    }
  },

  "Outputs" : {
    "Instance" : {
      "Value" : { "Fn::GetAtt" : [ "Ec2Instance", "PublicDnsName" ] }, 
      "Description" : "DNS Name of the newly created EC2 instance"
    }
  }
}