{
  "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" : {
    "DatabaseTemplate": {
      "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" }
        }
      }
    },

    "WebServer": {
      "Type": "AWS::EC2::Instance",
      "DependsOn": "DatabaseTemplate",
      "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" : [ "DatabaseTemplate", "Outputs.PublicIp" ]}, "/ /usr/share/wordpress/wp-config.php\n"
        ]]}}
      }
    }

  },

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