{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "AWS CloudFormation Sample Template VPC_AutoScaling_With_Public_IPs.template: Sample template showing how to create a load balanced, auto scaled group in a VPC where the EC2 instances can directly access the internet. **WARNING** This template creates Application Load Balancers and Amazon EC2 instances. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {

    "KeyName" : {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instances",
      "Type" : "AWS::EC2::KeyPair::KeyName",
      "ConstraintDescription" : "must be the name of an existing EC2 KeyPair."
    },

    "SSHLocation" : {
      "Description" : "Lockdown SSH access to the bastion host (default can be accessed from anywhere)",
      "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 CIDR range of the form x.x.x.x/x."
    },

    "WebServerInstanceType" : {
      "Description" : "WebServer Server EC2 instance type",
      "Type" : "String",
      "Default" : "t2.small",
      "AllowedValues" : [ "t1.micro", "t2.nano", "t2.micro", "t2.small", "t2.medium", "t2.large", "m1.small", "m1.medium", "m1.large", "m1.xlarge", "m2.xlarge", "m2.2xlarge", "m2.4xlarge", "m3.medium", "m3.large", "m3.xlarge", "m3.2xlarge", "m4.large", "m4.xlarge", "m4.2xlarge", "m4.4xlarge", "m4.10xlarge", "c1.medium", "c1.xlarge", "c3.large", "c3.xlarge", "c3.2xlarge", "c3.4xlarge", "c3.8xlarge", "c4.large", "c4.xlarge", "c4.2xlarge", "c4.4xlarge", "c4.8xlarge", "g2.2xlarge", "g2.8xlarge", "r3.large", "r3.xlarge", "r3.2xlarge", "r3.4xlarge", "r3.8xlarge", "i2.xlarge", "i2.2xlarge", "i2.4xlarge", "i2.8xlarge", "d2.xlarge", "d2.2xlarge", "d2.4xlarge", "d2.8xlarge", "hi1.4xlarge", "hs1.8xlarge", "cr1.8xlarge", "cc2.8xlarge", "cg1.4xlarge"]
,
      "ConstraintDescription" : "must be a valid EC2 instance type."
    },

    "WebServerCount" : {
      "Description" : "Number of EC2 instances to launch for the WebServer server",
      "Type" : "Number",
      "Default" : "1"
    }
  },

  "Mappings" : {
    "SubnetConfig" : {
      "VPC"     : { "CIDR" : "10.0.0.0/16" },
      "Public1" : { "CIDR" : "10.0.0.0/24" },
      "Public2" : { "CIDR" : "10.0.1.0/24" } 
    },
    "Region2Examples" : {
      "ap-east-1"      : { "Examples" : "https://s3-ap-east-1.amazonaws.com/cloudformation-examples-ap-east-1" },
      "ap-northeast-1" : { "Examples" : "https://s3-ap-northeast-1.amazonaws.com/cloudformation-examples-ap-northeast-1" },
      "ap-northeast-2" : { "Examples" : "https://s3-ap-northeast-2.amazonaws.com/cloudformation-examples-ap-northeast-2" },
      "ap-northeast-3" : { "Examples" : "https://s3-ap-northeast-3.amazonaws.com/cloudformation-examples-ap-northeast-3" },
      "ap-south-1"     : { "Examples" : "https://s3-ap-south-1.amazonaws.com/cloudformation-examples-ap-south-1" },
      "ap-south-2"     : { "Examples" : "https://s3-ap-south-2.amazonaws.com/cloudformation-examples-ap-south-2" },
      "ap-southeast-1" : { "Examples" : "https://s3-ap-southeast-1.amazonaws.com/cloudformation-examples-ap-southeast-1" },
      "ap-southeast-2" : { "Examples" : "https://s3-ap-southeast-2.amazonaws.com/cloudformation-examples-ap-southeast-2" },
      "ap-southeast-3" : { "Examples" : "https://s3-ap-southeast-3.amazonaws.com/cloudformation-examples-ap-southeast-3" },
      "ap-southeast-4" : { "Examples" : "https://s3-ap-southeast-4.amazonaws.com/cloudformation-examples-ap-southeast-4" },
      "ca-central-1"   : { "Examples" : "https://s3-ca-central-1.amazonaws.com/cloudformation-examples-ca-central-1" },
      "cn-north-1"     : { "Examples" : "https://s3.cn-north-1.amazonaws.com.cn/cloudformation-examples-cn-north-1" },
      "cn-northwest-1" : { "Examples" : "https://s3.cn-northwest-1.amazonaws.com.cn/cloudformation-examples-cn-northwest-1" },
      "eu-central-1"   : { "Examples" : "https://s3-eu-central-1.amazonaws.com/cloudformation-examples-eu-central-1" },
      "il-central-1" : { "Examples" : "https://s3-il-central-1.amazonaws.com/cloudformation-examples-il-central-1" },
      "eu-north-1"     : { "Examples" : "https://s3-eu-north-1.amazonaws.com/cloudformation-examples-eu-north-1" },
      "eu-west-1"      : { "Examples" : "https://s3-eu-west-1.amazonaws.com/cloudformation-examples-eu-west-1" },
      "eu-west-2"      : { "Examples" : "https://s3-eu-west-2.amazonaws.com/cloudformation-examples-eu-west-2" },
      "eu-west-3"      : { "Examples" : "https://s3-eu-west-3.amazonaws.com/cloudformation-examples-eu-west-3" },
      "me-south-1"     : { "Examples" : "https://s3-me-south-1.amazonaws.com/cloudformation-examples-me-south-1" },
      "me-central-1"   : { "Examples" : "https://s3-me-central-1.amazonaws.com/cloudformation-examples-me-central-1" },
      "eu-south-2"     : { "Examples" : "https://s3-eu-south-2.amazonaws.com/cloudformation-examples-eu-south-2" },
      "eu-central-2"   : { "Examples" : "https://s3-eu-central-2.amazonaws.com/cloudformation-examples-eu-central-2" },
      "sa-east-1"      : { "Examples" : "https://s3-sa-east-1.amazonaws.com/cloudformation-examples-sa-east-1" },
      "us-east-1"      : { "Examples" : "https://s3.amazonaws.com/cloudformation-examples-us-east-1" },
      "us-east-2"      : { "Examples" : "https://s3-us-east-2.amazonaws.com/cloudformation-examples-us-east-2" },
      "us-west-1"      : { "Examples" : "https://s3-us-west-1.amazonaws.com/cloudformation-examples-us-west-1" },
      "us-west-2"      : { "Examples" : "https://s3-us-west-2.amazonaws.com/cloudformation-examples-us-west-2" }
    }
,
    "AWSInstanceType2Arch" : {
      "c1.medium"   : { "Arch" : "HVM64"  },
      "c1.xlarge"   : { "Arch" : "HVM64"  },
      "c3.2xlarge"  : { "Arch" : "HVM64"  },
      "c3.4xlarge"  : { "Arch" : "HVM64"  },
      "c3.8xlarge"  : { "Arch" : "HVM64"  },
      "c3.large"    : { "Arch" : "HVM64"  },
      "c3.xlarge"   : { "Arch" : "HVM64"  },
      "c4.2xlarge"  : { "Arch" : "HVM64"  },
      "c4.4xlarge"  : { "Arch" : "HVM64"  },
      "c4.8xlarge"  : { "Arch" : "HVM64"  },
      "c4.large"    : { "Arch" : "HVM64"  },
      "c4.xlarge"   : { "Arch" : "HVM64"  },
      "cc2.8xlarge" : { "Arch" : "HVM64"  },
      "cr1.8xlarge" : { "Arch" : "HVM64"  },
      "d2.2xlarge"  : { "Arch" : "HVM64"  },
      "d2.4xlarge"  : { "Arch" : "HVM64"  },
      "d2.8xlarge"  : { "Arch" : "HVM64"  },
      "d2.xlarge"   : { "Arch" : "HVM64"  },
      "g2.2xlarge"  : { "Arch" : "HVMG2"  },
      "g2.8xlarge"  : { "Arch" : "HVMG2"  },
      "hi1.4xlarge" : { "Arch" : "HVM64"  },
      "hs1.8xlarge" : { "Arch" : "HVM64"  },
      "i2.2xlarge"  : { "Arch" : "HVM64"  },
      "i2.4xlarge"  : { "Arch" : "HVM64"  },
      "i2.8xlarge"  : { "Arch" : "HVM64"  },
      "i2.xlarge"   : { "Arch" : "HVM64"  },
      "m1.large"    : { "Arch" : "HVM64"  },
      "m1.medium"   : { "Arch" : "HVM64"  },
      "m1.small"    : { "Arch" : "HVM64"  },
      "m1.xlarge"   : { "Arch" : "HVM64"  },
      "m2.2xlarge"  : { "Arch" : "HVM64"  },
      "m2.4xlarge"  : { "Arch" : "HVM64"  },
      "m2.xlarge"   : { "Arch" : "HVM64"  },
      "m3.2xlarge"  : { "Arch" : "HVM64"  },
      "m3.large"    : { "Arch" : "HVM64"  },
      "m3.medium"   : { "Arch" : "HVM64"  },
      "m3.xlarge"   : { "Arch" : "HVM64"  },
      "m4.10xlarge" : { "Arch" : "HVM64"  },
      "m4.2xlarge"  : { "Arch" : "HVM64"  },
      "m4.4xlarge"  : { "Arch" : "HVM64"  },
      "m4.large"    : { "Arch" : "HVM64"  },
      "m4.xlarge"   : { "Arch" : "HVM64"  },
      "r3.2xlarge"  : { "Arch" : "HVM64"  },
      "r3.4xlarge"  : { "Arch" : "HVM64"  },
      "r3.8xlarge"  : { "Arch" : "HVM64"  },
      "r3.large"    : { "Arch" : "HVM64"  },
      "r3.xlarge"   : { "Arch" : "HVM64"  },
      "t1.micro"    : { "Arch" : "HVM64"  },
      "t2.large"    : { "Arch" : "HVM64"  },
      "t2.medium"   : { "Arch" : "HVM64"  },
      "t2.micro"    : { "Arch" : "HVM64"  },
      "t2.nano"     : { "Arch" : "HVM64"  },
      "t2.small"    : { "Arch" : "HVM64"  }
    },

    "AWSInstanceType2NATArch" : {
      "c1.medium"   : { "Arch" : "NATHVM64"  },
      "c1.xlarge"   : { "Arch" : "NATHVM64"  },
      "c3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "c3.4xlarge"  : { "Arch" : "NATHVM64"  },
      "c3.8xlarge"  : { "Arch" : "NATHVM64"  },
      "c3.large"    : { "Arch" : "NATHVM64"  },
      "c3.xlarge"   : { "Arch" : "NATHVM64"  },
      "c4.2xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.4xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.8xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.large"    : { "Arch" : "NATHVM64"  },
      "c4.xlarge"   : { "Arch" : "NATHVM64"  },
      "cc2.8xlarge" : { "Arch" : "NATHVM64"  },
      "cr1.8xlarge" : { "Arch" : "NATHVM64"  },
      "d2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.8xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.xlarge"   : { "Arch" : "NATHVM64"  },
      "g2.2xlarge"  : { "Arch" : "NATHVMG2"  },
      "g2.8xlarge"  : { "Arch" : "NATHVMG2"  },
      "hi1.4xlarge" : { "Arch" : "NATHVM64"  },
      "hs1.8xlarge" : { "Arch" : "NATHVM64"  },
      "i2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.8xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.xlarge"   : { "Arch" : "NATHVM64"  },
      "m1.large"    : { "Arch" : "NATHVM64"  },
      "m1.medium"   : { "Arch" : "NATHVM64"  },
      "m1.small"    : { "Arch" : "NATHVM64"  },
      "m1.xlarge"   : { "Arch" : "NATHVM64"  },
      "m2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "m2.xlarge"   : { "Arch" : "NATHVM64"  },
      "m3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m3.large"    : { "Arch" : "NATHVM64"  },
      "m3.medium"   : { "Arch" : "NATHVM64"  },
      "m3.xlarge"   : { "Arch" : "NATHVM64"  },
      "m4.10xlarge" : { "Arch" : "NATHVM64"  },
      "m4.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m4.4xlarge"  : { "Arch" : "NATHVM64"  },
      "m4.large"    : { "Arch" : "NATHVM64"  },
      "m4.xlarge"   : { "Arch" : "NATHVM64"  },
      "r3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "r3.4xlarge"  : { "Arch" : "NATHVM64"  },
      "r3.8xlarge"  : { "Arch" : "NATHVM64"  },
      "r3.large"    : { "Arch" : "NATHVM64"  },
      "r3.xlarge"   : { "Arch" : "NATHVM64"  },
      "t1.micro"    : { "Arch" : "NATHVM64"  },
      "t2.large"    : { "Arch" : "NATHVM64"  },
      "t2.medium"   : { "Arch" : "NATHVM64"  },
      "t2.micro"    : { "Arch" : "NATHVM64"  },
      "t2.nano"     : { "Arch" : "NATHVM64"  },
      "t2.small"    : { "Arch" : "NATHVM64"  }
    }
,
    "AWSRegionArch2AMI" : {
      "af-south-1"       : {"HVM64" : "ami-0412806bd0f2cf75f", "HVMG2" : "NOT_SUPPORTED"},
      "ap-east-1"        : {"HVM64" : "ami-0e0a21f8bd5195698", "HVMG2" : "NOT_SUPPORTED"},
      "ap-northeast-1"   : {"HVM64" : "ami-0c3e3e7af817ad732", "HVMG2" : "NOT_SUPPORTED"},
      "ap-northeast-2"   : {"HVM64" : "ami-0f8dbbf156e3a5cc6", "HVMG2" : "NOT_SUPPORTED"},
      "ap-northeast-3"   : {"HVM64" : "ami-02a371c41f08cc499", "HVMG2" : "NOT_SUPPORTED"},
      "ap-south-1"       : {"HVM64" : "ami-0f4ab3c8db917e421", "HVMG2" : "NOT_SUPPORTED"},
      "ap-south-2"       : {"HVM64" : "ami-008b9c53bb1dcd29c", "HVMG2" : "NOT_SUPPORTED"},
      "ap-southeast-1"   : {"HVM64" : "ami-0c3189395e5b39df7", "HVMG2" : "NOT_SUPPORTED"},
      "ap-southeast-2"   : {"HVM64" : "ami-040d698318c0b1575", "HVMG2" : "NOT_SUPPORTED"},
      "ap-southeast-3"   : {"HVM64" : "ami-065dcca47dde26602", "HVMG2" : "NOT_SUPPORTED"},
      "ap-southeast-4"   : {"HVM64" : "ami-043e25432cf94e107", "HVMG2" : "NOT_SUPPORTED"},
      "il-central-1"     : {"HVM64" : "ami-0054be7d7d9d65a1d", "HVMG2" : "NOT_SUPPORTED"},
      "ca-central-1"     : {"HVM64" : "ami-05f40104305a2cdf7", "HVMG2" : "NOT_SUPPORTED"},
      "cn-north-1"       : {"HVM64" : "ami-03f1e08d409b1e5fd", "HVMG2" : "NOT_SUPPORTED"},
      "cn-northwest-1"   : {"HVM64" : "ami-00093746b9a0e272a", "HVMG2" : "NOT_SUPPORTED"},
      "eu-central-1"     : {"HVM64" : "ami-0f454ec961da9a046", "HVMG2" : "NOT_SUPPORTED"},
      "eu-north-1"       : {"HVM64" : "ami-0e78cd18c67fcf512", "HVMG2" : "NOT_SUPPORTED"},
      "eu-south-1"       : {"HVM64" : "ami-07d048788725b9602", "HVMG2" : "NOT_SUPPORTED"},
      "eu-west-1"        : {"HVM64" : "ami-0db5ca3e5748fb7e2", "HVMG2" : "NOT_SUPPORTED"},
      "eu-west-2"        : {"HVM64" : "ami-07baf6b15b7387f24", "HVMG2" : "NOT_SUPPORTED"},
      "eu-west-3"        : {"HVM64" : "ami-05a13fbd8aa57eedc", "HVMG2" : "NOT_SUPPORTED"},
      "me-south-1"       : {"HVM64" : "ami-0007de3fdcaba7e44", "HVMG2" : "NOT_SUPPORTED"},
      "me-central-1"     : {"HVM64" : "ami-06ce88defa3fc74ed", "HVMG2" : "NOT_SUPPORTED"},
      "eu-south-2"       : {"HVM64" : "ami-051306f4e885d6de4", "HVMG2" : "NOT_SUPPORTED"},
      "eu-central-2"     : {"HVM64" : "ami-0fcd532574732cb0f", "HVMG2" : "NOT_SUPPORTED"},
      "sa-east-1"        : {"HVM64" : "ami-07f6e9fce0e888425", "HVMG2" : "NOT_SUPPORTED"},
      "us-east-1"        : {"HVM64" : "ami-01989ebfd388ea377", "HVMG2" : "NOT_SUPPORTED"},
      "us-east-2"        : {"HVM64" : "ami-0de69dde1945155da", "HVMG2" : "NOT_SUPPORTED"},
      "us-west-1"        : {"HVM64" : "ami-08fe20a82dcaa1c92", "HVMG2" : "NOT_SUPPORTED"},
      "us-west-2"        : {"HVM64" : "ami-05848d23360f5edfe", "HVMG2" : "NOT_SUPPORTED"}
    }

  },

  "Resources" : {

    "VPC" : {
      "Type" : "AWS::EC2::VPC",
      "Properties" : {
        "CidrBlock" : { "Fn::FindInMap" : [ "SubnetConfig", "VPC", "CIDR" ]},
        "EnableDnsSupport" : "true",
        "EnableDnsHostnames" : "true",
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "PublicSubnet1" : {
      "Type" : "AWS::EC2::Subnet",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "CidrBlock" : { "Fn::FindInMap" : [ "SubnetConfig", "Public1", "CIDR" ]},
        "AvailabilityZone" : {"Fn::Select": [0, {"Fn::GetAZs": ""}]},
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "PublicSubnet2" : {
      "Type" : "AWS::EC2::Subnet",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "CidrBlock" : { "Fn::FindInMap" : [ "SubnetConfig", "Public2", "CIDR" ]},
        "AvailabilityZone" : {"Fn::Select": [1, {"Fn::GetAZs": ""}]},
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "InternetGateway" : {
      "Type" : "AWS::EC2::InternetGateway",
      "Properties" : {
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "GatewayToInternet" : {
       "Type" : "AWS::EC2::VPCGatewayAttachment",
       "Properties" : {
         "VpcId" : { "Ref" : "VPC" },
         "InternetGatewayId" : { "Ref" : "InternetGateway" }
       }
    },

    "PublicRouteTable" : {
      "Type" : "AWS::EC2::RouteTable",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "PublicRoute" : {
      "Type" : "AWS::EC2::Route",
      "DependsOn" : "GatewayToInternet",
      "Properties" : {
        "RouteTableId" : { "Ref" : "PublicRouteTable" },
        "DestinationCidrBlock" : "0.0.0.0/0",
        "GatewayId" : { "Ref" : "InternetGateway" }
      }
    },

    "PublicSubnetRouteTableAssociation1" : {
      "Type" : "AWS::EC2::SubnetRouteTableAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet1" },
        "RouteTableId" : { "Ref" : "PublicRouteTable" }
      }
    },

    "PublicSubnetRouteTableAssociation2" : {
      "Type" : "AWS::EC2::SubnetRouteTableAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet2" },
        "RouteTableId" : { "Ref" : "PublicRouteTable" }
      }
    },

    "PublicNetworkAcl" : {
      "Type" : "AWS::EC2::NetworkAcl",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "Tags" : [
          { "Key" : "Application", "Value" : { "Ref" : "AWS::StackId" } },
          { "Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "InboundHTTPPublicNetworkAclEntry" : {
      "Type" : "AWS::EC2::NetworkAclEntry",
      "Properties" : {
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" },
        "RuleNumber" : "100",
        "Protocol" : "6",
        "RuleAction" : "allow",
        "Egress" : "false",
        "CidrBlock" : "0.0.0.0/0",
        "PortRange" : { "From" : "80", "To" : "80" }
      }
    },

    "InboundDynamicPortPublicNetworkAclEntry" : {
      "Type" : "AWS::EC2::NetworkAclEntry",
      "Properties" : {
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" },
        "RuleNumber" : "101",
        "Protocol" : "6",
        "RuleAction" : "allow",
        "Egress" : "false",
        "CidrBlock" : "0.0.0.0/0",
        "PortRange" : { "From" : "1024", "To" : "65535" }
      }
    },

    "InboundSSHPublicNetworkAclEntry" : {
      "Type" : "AWS::EC2::NetworkAclEntry",
      "Properties" : {
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" },
        "RuleNumber" : "102",
        "Protocol" : "6",
        "RuleAction" : "allow",
        "Egress" : "false",
        "CidrBlock" : { "Ref" : "SSHLocation" },
        "PortRange" : { "From" : "22", "To" : "22" }
      }
    },

    "OutboundPublicNetworkAclEntry" : {
      "Type" : "AWS::EC2::NetworkAclEntry",
      "Properties" : {
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" },
        "RuleNumber" : "100",
        "Protocol" : "6",
        "RuleAction" : "allow",
        "Egress" : "true",
        "CidrBlock" : "0.0.0.0/0",
        "PortRange" : { "From" : "0", "To" : "65535" }
      }
    },

    "PublicSubnetNetworkAclAssociation1" : {
      "Type" : "AWS::EC2::SubnetNetworkAclAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet1" },
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" }
      }
    },

    "PublicSubnetNetworkAclAssociation2" : {
      "Type" : "AWS::EC2::SubnetNetworkAclAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet2" },
        "NetworkAclId" : { "Ref" : "PublicNetworkAcl" }
      }
    },

    "PublicApplicationLoadBalancer" : {
      "Type" : "AWS::ElasticLoadBalancingV2::LoadBalancer",
      "Properties" : {
        "Subnets" : [ { "Ref" : "PublicSubnet1"}, { "Ref" : "PublicSubnet2" } ],
        "SecurityGroups" : [ { "Ref" : "PublicLoadBalancerSecurityGroup" } ]
      }
    },

    "ALBListener" : {
      "Type" : "AWS::ElasticLoadBalancingV2::Listener",
      "Properties" : {
        "DefaultActions" : [{
          "Type" : "forward",
          "TargetGroupArn" : { "Ref" : "ALBTargetGroup" }
        }],
        "LoadBalancerArn" : { "Ref" : "PublicApplicationLoadBalancer" },
        "Port" : "80",
        "Protocol" : "HTTP"
      }
    },

    "ALBTargetGroup" : {
      "Type" : "AWS::ElasticLoadBalancingV2::TargetGroup",
      "Properties" : {
        "HealthCheckIntervalSeconds" : 90,
        "HealthCheckTimeoutSeconds" : 60,
        "HealthyThresholdCount" : 3,
        "Port" : 80,
        "Protocol" : "HTTP",
        "UnhealthyThresholdCount" : 5,
        "VpcId" : {"Ref" : "VPC"}
      }
    },

    "PublicLoadBalancerSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Public ELB Security Group with HTTP access on port 80 from the internet",
        "VpcId" : { "Ref" : "VPC" },
        "SecurityGroupIngress" : [ { "IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "CidrIp" : "0.0.0.0/0"} ],
        "SecurityGroupEgress" : [ { "IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "CidrIp" : "0.0.0.0/0"} ]
      }
    },

    "WebServerFleet" : {
      "Type" : "AWS::AutoScaling::AutoScalingGroup",
      "DependsOn" : "PublicRoute",
      "Properties" : {
        "VPCZoneIdentifier" : [{ "Ref" : "PublicSubnet1" }, { "Ref" : "PublicSubnet2" }],
        "LaunchConfigurationName" : { "Ref" : "WebServerLaunchConfig"  },
        "MinSize" : "1",
        "MaxSize" : "10",
        "DesiredCapacity" : { "Ref" : "WebServerCount" },
        "TargetGroupARNs" : [ { "Ref" : "ALBTargetGroup" } ],
        "Tags" : [ { "Key" : "Network", "Value" : "Public", "PropagateAtLaunch" : "true" } ]
      },
      "CreationPolicy" : {
        "ResourceSignal" : {
          "Timeout" : "PT45M",
          "Count"   : { "Ref" : "WebServerCount" }
        }
      },
      "UpdatePolicy": {
        "AutoScalingRollingUpdate": {
          "MinInstancesInService": "1",
          "MaxBatchSize": "1",
          "PauseTime" : "PT15M",
          "WaitOnResourceSignals": "true"
        }
      }
    },

    "WebServerLaunchConfig"  : {
      "Type" : "AWS::AutoScaling::LaunchConfiguration",
      "Metadata" : {
        "AWS::CloudFormation::Init" : {
          "config" : {
            "packages" : {
              "yum" : {
                "httpd" : []
              }
            },

            "files" : {
              "/var/www/html/index.html" : {
                "content" : { "Fn::Join" : ["\n", [
                  "<img src=\"", {"Fn::FindInMap" : ["Region2Examples", {"Ref" : "AWS::Region"}, "Examples"]}, "/cloudformation_graphic.png\" alt=\"AWS CloudFormation Logo\"/>",
                  "<h1>Congratulations, you have successfully launched the AWS CloudFormation sample.</h1>"
                ]]},
                "mode"    : "000644",
                "owner"   : "root",
                "group"   : "root"
              },
              "/etc/cfn/cfn-hup.conf" : {
                "content" : { "Fn::Join" : ["", [
                  "[main]\n",
                  "stack=", { "Ref" : "AWS::StackId" }, "\n",
                  "region=", { "Ref" : "AWS::Region" }, "\n"
                ]]},
                "mode"    : "000400",
                "owner"   : "root",
                "group"   : "root"
              },

              "/etc/cfn/hooks.d/cfn-auto-reloader.conf" : {
                "content": { "Fn::Join" : ["", [
                  "[cfn-auto-reloader-hook]\n",
                  "triggers=post.update\n",
                  "path=Resources.WebServerLaunchConfig.Metadata.AWS::CloudFormation::Init\n",
                  "action=/opt/aws/bin/cfn-init -v ",
                  "         --stack ", { "Ref" : "AWS::StackName" },
                  "         --resource WebServerLaunchConfig ",
                  "         --region ", { "Ref" : "AWS::Region" }, "\n",
                  "runas=root\n"
                ]]},
                "mode"    : "000400",
                "owner"   : "root",
                "group"   : "root"
              }
            },

            "services" : {
              "sysvinit" : {
                "httpd" : { "enabled" : "true", "ensureRunning" : "true", 
                              "files" : [ "/etc/httpd/conf.d/aptobackend.conf", "/var/www/html/index.html" ]},
                "cfn-hup" : { "enabled" : "true", "ensureRunning" : "true",
                              "files" : ["/etc/cfn/cfn-hup.conf", "/etc/cfn/hooks.d/cfn-auto-reloader.conf"]}
              }
            }
          }
        }
      },
      "Properties" : {
        "ImageId"        : { "Fn::FindInMap" : [ "AWSRegionArch2AMI", { "Ref" : "AWS::Region" }, { "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "WebServerInstanceType" }, "Arch" ] } ] },
        "SecurityGroups" : [ { "Ref" : "WebServerSecurityGroup" } ],
        "InstanceType"   : { "Ref" : "WebServerInstanceType" },
        "KeyName"        : { "Ref" : "KeyName" },
        "AssociatePublicIpAddress" : "true",
        "UserData"       : { "Fn::Base64" : { "Fn::Join" : ["", [
          "#!/bin/bash -xe\n",
          "yum update -y aws-cfn-bootstrap\n",

          "# Install the sample application\n",
          "/opt/aws/bin/cfn-init -v ",
          "    --stack ", { "Ref" : "AWS::StackId" },
          "    --resource WebServerLaunchConfig ",
          "    --region ", { "Ref" : "AWS::Region" }, "\n",

          "# Signal copletion\n",
          "/opt/aws/bin/cfn-signal -e $? ",
          "    --stack ", { "Ref" : "AWS::StackId" },
          "    --resource WebServerFleet ",
          "    --region ", { "Ref" : "AWS::Region" }, "\n"
        ]]}}
      }
    },

    "WebServerSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Allow access from load balancer and bastion as well as outbound HTTP and HTTPS traffic",
        "VpcId" : { "Ref" : "VPC" },
        "SecurityGroupIngress" : [
          { "IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "SourceSecurityGroupId" : { "Ref" : "PublicLoadBalancerSecurityGroup" } } ,
          { "IpProtocol" : "tcp", "FromPort" : "22", "ToPort" : "22", "CidrIp" : { "Ref" : "SSHLocation" } } ]
      }
    }
  },

  "Outputs" : {
    "WebSite" : {
      "Description" : "URL of the website",
      "Value" :  { "Fn::Join" : [ "", [ "http://", { "Fn::GetAtt" : [ "PublicApplicationLoadBalancer", "DNSName" ]}]]}
    }
  }
}
