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

  "Description": "WordPress is web software you can use to create a beautiful website or blog. This template installs two instances: one running a WordPress deployment and the other, created within a separate stack embedded in this one with template composition, using a local MySQL database to store the data.",

  "Parameters": {

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

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

    "DBName": {
      "Default": "wordpress",
      "Description": "The WordPress database name",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "64",
      "AllowedPattern": "[a-zA-Z][a-zA-Z0-9]*",
      "ConstraintDescription": "must begin with a letter and contain only alphanumeric characters."
    },

    "DBUsername": {
      "Default": "admin",
      "NoEcho": "true",
      "Description": "The WordPress database admin account username",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "16",
      "AllowedPattern": "[a-zA-Z][a-zA-Z0-9]*",
      "ConstraintDescription": "must begin with a letter and contain only alphanumeric characters."
    },

    "DBPassword": {
      "Default": "admin",
      "NoEcho": "true",
      "Description": "The WordPress database admin account password",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "41",
      "AllowedPattern": "[a-zA-Z0-9]*",
      "ConstraintDescription": "must contain only alphanumeric characters."
    },

    "DBRootPassword": {
      "Default": "admin",
      "NoEcho": "true",
      "Description": "Root password for MySQL",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "41",
      "AllowedPattern": "[a-zA-Z0-9]*",
      "ConstraintDescription": "must contain only alphanumeric characters."
    },
    "LinuxDistribution": {
      "Default": "F16",
      "Description": "Distribution of choice",
      "Type": "String",
      "AllowedValues": [ "F16", "F17", "U10", "RHEL-6.1", "RHEL-6.2", "RHEL-6.3" ]
    }
  },

  "Mappings": {
    "AWSInstanceType2Arch": {
      "t1.micro"    : { "Arch": "32" },
      "m1.small"    : { "Arch": "32" },
      "m1.large"    : { "Arch": "64" },
      "m1.xlarge"   : { "Arch": "64" },
      "m2.xlarge"   : { "Arch": "64" },
      "m2.2xlarge"  : { "Arch": "64" },
      "m2.4xlarge"  : { "Arch": "64" },
      "c1.medium"   : { "Arch": "32" },
      "c1.xlarge"   : { "Arch": "64" },
      "cc1.4xlarge" : { "Arch": "64" }
    },
    "DistroArch2AMI": {
      "F16"     : { "32": "F16-i386-cfntools", "64": "F16-x86_64-cfntools" },
      "F17"     : { "32": "F17-i386-cfntools", "64": "F17-x86_64-cfntools" },
      "U10"     : { "32": "U10-i386-cfntools", "64": "U10-x86_64-cfntools" },
      "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": {
    "DatabaseServer": {
      "Type": "AWS::CloudFormation::Stack",
      "Properties": {
        "TemplateURL": "https://raw.github.com/heat-api/heat/master/templates/MySQL_Single_Instance.template",
        "Parameters": {
          "KeyName"          : { "Ref": "KeyName" },
          "InstanceType"     : { "Ref": "InstanceType" },
          "DBName"           : { "Ref": "DBName" },
          "DBUsername"       : { "Ref": "DBUsername" },
          "DBPassword"       : { "Ref": "DBPassword" },
          "DBRootPassword"   : { "Ref": "DBRootPassword" },
          "LinuxDistribution": { "Ref": "LinuxDistribution" }
        }
      }
    },

    "WikiServerOne": {
      "Type": "AWS::EC2::Instance",
      "DependsOn" : "DatabaseServer",
      "Metadata": {
        "AWS::CloudFormation::Init": {
          "config": {
            "packages": {
              "yum": {
                "httpd"        : [],
                "wordpress"    : []
              }
            },
            "services": {
              "systemd": {
                "httpd"    : { "enabled": "true", "ensureRunning": "true" }
              }
            }
          }
        }
      },
      "Properties": {
        "ImageId": { "Fn::FindInMap": [ "DistroArch2AMI", { "Ref": "LinuxDistribution" },
                          { "Fn::FindInMap": [ "AWSInstanceType2Arch", { "Ref": "InstanceType" }, "Arch" ] } ] },
        "InstanceType"   : { "Ref": "InstanceType" },
        "KeyName"        : { "Ref": "KeyName" },
        "UserData"       : { "Fn::Base64": { "Fn::Join": ["", [
          "#!/bin/bash -v\n",
          "/opt/aws/bin/cfn-init\n",
          "sed --in-place --e s/database_name_here/", { "Ref": "DBName" },
          "/ --e s/username_here/", { "Ref": "DBUsername" },
          "/ --e s/password_here/", { "Ref": "DBPassword" },
          "/ --e s/localhost/", { "Fn::GetAtt": [ "DatabaseServer", "Outputs.PublicIp" ]},
          "/ /usr/share/wordpress/wp-config.php\n"
        ]]}}
      }
    },

    "LoadBalancer" : {
      "Type" : "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties" : {
        "AvailabilityZones" : { "Fn::GetAZs" : "" },
        "Instances" : [{"Ref": "WikiServerOne"}],
        "Listeners" : [ {
          "LoadBalancerPort" : "80",
          "InstancePort" : "80",
          "Protocol" : "HTTP"
        }]
      }
    }
  },

  "Outputs": {
    "WebsiteURL": {
      "Value": { "Fn::Join": ["", ["http://", { "Fn::GetAtt": [ "LoadBalancer", "DNSName" ]}, "/wordpress"]] },
      "Description": "URL for Wordpress wiki"
    }
  }
}