as.template

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

  "Description": "A load balancer instance running a local HAproxy on Fedora 19",

  "Parameters": {
    "DesiredCapacity": {
      "Default": "1",
      "MinValue": "1",
      "MaxValue": "1001",
      "Description" : "Number of instances to create",
      "Type": "Number"
    },  
    
    "SubnetUuid223" : { 
        "Description" : "Subnet UUID",
        "Default" : "a124349d-daa2-4e0f-bffc-af771830c654",
        "Type" : "String"
    },  

    "KeyName": {
      "Description": "Name of an existing EC2 KeyPair to enable SSH access to the instances",
      "Type": "String",
      "Default" : "heat_key"
    },  


    "InstanceType": {
      "Description": "HAProxy server EC2 instance type",
      "Default": "m1.small",
      "Type": "String",
      "AllowedValues": [ "m1.tiny", "m1.small", "m1.medium", "m1.large", "m1.xlarge" ],
      "ConstraintDescription": "must be a valid EC2 instance type."
    },  

    "LinuxDistribution": {
      "Default": "F17",
      "Description" : "Distribution of choice",
      "Type": "String",
      "AllowedValues" : [ "F19", "F18", "F17", "U12", "RHEL-6.1", "RHEL-6.2", "RHEL-6.3" ]
    }   
  },  

  "Mappings" : { 
    "AWSInstanceType2Arch" : { 
      "m1.tiny"    : { "Arch" : "32" },
      "m1.small"    : { "Arch" : "64" },
      "m1.medium"    : { "Arch" : "64" },
      "m1.large"   : { "Arch" : "64" },
      "m1.xlarge"   : { "Arch" : "64" }
    },
    "DistroArch2AMI": {
      "F19"      : { "32" : "F19-i386-cfntools", "64" : "F19-x86_64-cfntools" },
      "F18"      : { "32" : "F18-i386-cfntools", "64" : "F18-x86_64-cfntools" },
      "F17"      : { "32" : "F17-i386-cfntools", "64" : "F17-x86_64-cfntools" },
      "U12"      : { "32" : "U10-i386-cfntools", "64" : "precise" },
      "RHEL-6.1" : { "32" : "rhel61-i386-cfntools", "64" : "rhel61-x86_64-cfntools" },
      "RHEL-6.2" : { "32" : "rhel62-i386-cfntools", "64" : "rhel62-x86_64-cfntools" },
      "RHEL-6.3" : { "32" : "rhel63-i386-cfntools", "64" : "rhel63-x86_64-cfntools" }
    }
  },

  "Resources": {
    "Group223" : {
      "Type" : "AWS::AutoScaling::AutoScalingGroup",
      "Properties" : {
        "LaunchConfigurationName" : { "Ref" : "Config223" },
        "AvailabilityZones" : { "Fn::GetAZs" : "" },
        "VPCZoneIdentifier" : [ { "Ref" : "SubnetUuid223" } ],
        "MinSize" : "1",
        "MaxSize" : "1000",
        "DesiredCapacity" : { "Ref" : "DesiredCapacity" }
      }
    },
    "Config223" : {
      "Type" : "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "ImageId" : {
          "Fn::FindInMap" : [ "DistroArch2AMI",
                              { "Ref" : "LinuxDistribution" },
                              { "Fn::FindInMap" : [ "AWSInstanceType2Arch",
                                                    { "Ref" : "InstanceType" },
                                                    "Arch" ] } ]
        },
        "InstanceType"      : { "Ref" : "InstanceType" },
        "KeyName"           : { "Ref" : "KeyName" },
        "NovaSchedulerHints": [ {"Key": "part", "Value": "long"},
                                {"Key": "ready", "Value": "short"} ],
        "UserData"          : { "Fn::Base64" : { "Fn::Join" : ["", [
          "#!/bin/bash -v\n"
        ]]}}
      }
    }
  },

  "Outputs": {
    "PublicIp": {
      "Value": { "Fn::GetAtt": [ "LoadBalancerInstance", "PublicIp" ] },
      "Description": "instance IP"
    }
  }
}