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

  "Description": "This template demonstrates using Opscode Chef Solo to deploy the WordPress application. It uses embedded templates to build an Auto Scaling group and a Amazon Relational Database Service database instance. **WARNING** This template creates one or more Amazon EC2 instances, an Amazon RDS database instance and CloudWatch alarms. 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 web server",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "255",
      "AllowedPattern" : "[\\x20-\\x7E]*",
      "ConstraintDescription" : "can contain only ASCII characters."
    },
    "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."
    },
    "DatabaseType": {
      "Default": "db.m1.small",
      "Description" : "The database instance type",
      "Type": "String",
      "AllowedValues" : [ "db.m1.small", "db.m1.large", "db.m1.xlarge", "db.m2.xlarge", "db.m2.2xlarge", "db.m2.4xlarge" ],
      "ConstraintDescription" : "must contain only alphanumeric characters."
    },
    "DatabaseUser": {
      "NoEcho": "true",
      "Type": "String",
      "Default" :  "MyUsername",
      "Description" : "Test database admin account name",
      "MinLength": "1",
      "MaxLength": "16",
      "AllowedPattern" : "[a-zA-Z][a-zA-Z0-9]*",
      "ConstraintDescription" : "must begin with a letter and contain only alphanumeric characters."
    },
    "DatabasePassword": {
      "NoEcho": "true",
      "Type": "String",
      "Default" :  "MyPassword",
      "Description" : "Test database admin account password",
      "MinLength": "1",
      "MaxLength": "41",
      "AllowedPattern" : "[a-zA-Z0-9]*",
      "ConstraintDescription" : "must contain only alphanumeric characters."
    },
    "OperatorEmail": {
      "Description": "EMail address to notify if there are operational issues",
      "Type": "String"
    },
    "HighlyAvailable": {
      "Default": "true",
      "Description" : "Create a solution that spans multiple Availability Zones for high availability",
      "Type": "String",
      "AllowedValues" : [ "true", "false" ],
      "ConstraintDescription" : "must be true or false."
    },
    "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" : {
    "RegionMap" : {
      "us-east-1" :      { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-us-east-1" },
      "us-west-1" :      { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-us-west-1" },
      "us-west-2" :      { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-us-west-2" },
      "eu-west-1" :      { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-eu-west-1" },
      "sa-east-1" :      { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-sa-east-1" },
      "ap-northeast-1" : { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-ap-northeast-1" },
      "ap-southeast-1" : { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-ap-southeast-1" },
      "ap-southeast-2" : { "TemplateLocation" : "https://s3.amazonaws.com/cloudformation-templates-ap-southeast-2" }
    },
    "AvailabilityMap" : {
      "true"  : { "InstanceCount" : "2", "MultiAZDB" : "true" },
      "false" : { "InstanceCount" : "1", "MultiAZDB" : "false" }
    }
  },

  "Resources" : {

    "AlarmTopic" : {
      "Type" : "AWS::SNS::Topic",
      "Properties" : {
        "Subscription" : [ {
            "Endpoint" : { "Ref": "OperatorEmail" },
            "Protocol" : "email"
        } ]
      }
    },

    "EC2SecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Open up SSH access",
        "SecurityGroupIngress" : [ {
          "IpProtocol": "tcp",
          "FromPort": "22",
          "ToPort": "22",
          "CidrIp": {"Ref" : "SSHLocation"}
        } ]
      }
    },

    "WordPressFrontEnd" : {
      "Type" : "AWS::CloudFormation::Stack",
      "Metadata" : {
        "Comment" : "Create Wordpress web server farm attached to database.",
        "AWS::CloudFormation::Init" : {
          "config" : {
            "files" : {
              "/etc/chef/node.json" : {
                "content" : {
                  "wordpress" : {
                    "db" : {
                      "host"     : {"Fn::GetAtt" : ["WordpressDatabase", "Outputs.DBAddress"]},
                      "database" : "WordPressDB",
                      "user"     : {"Ref" : "DatabaseUser"},
                      "password" : {"Ref" : "DatabasePassword" }
                    }
                  },
                  "run_list": [ "recipe[wordpress]" ]
                },
                "mode"  : "000644",
                "owner" : "root",
                "group" : "wheel"
              }
            }
          }
        }
      },
      "Properties" : {
        "TemplateURL" : { "Fn::Join" : ["/", ["https://s3.amazonaws.com/cloudformation-templates-ap-northeast-1",
                          "chef-solo-configuration-mod.template" ]]},
        "Parameters" : {
          "RecipeURL"          : "https://s3.amazonaws.com/cloudformation-examples/wordpress.tar.gz",
          "HealthCheckPath"    : "/wp-admin/install.php",
          "KeyName"            : { "Ref" : "KeyName" },
          "InstanceType"       : { "Ref" : "InstanceType"},
          "EC2SecurityGroup"   : { "Ref" : "EC2SecurityGroup" },
          "StackNameOrId"      : { "Ref" : "AWS::StackId" },
          "ResourceName"       : "WordPressFrontEnd",
          "AlarmTopic"         : { "Ref" : "AlarmTopic" },
          "WebServerPort"      : "80",
          "DesiredCapacity"    : { "Fn::FindInMap" : [ "AvailabilityMap", { "Ref" : "HighlyAvailable" }, "InstanceCount" ]}
        }
      }
    },

    "WordpressDatabase" : {
      "Type" : "AWS::CloudFormation::Stack",
      "Metadata" : {
          "Comment" : "Database configuration for Wordpress."
      },
      "Properties" : {
        "TemplateURL" : { "Fn::Join" : ["/", [{ "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "TemplateLocation" ]},
                          "RDS_MySQL_55.template" ]]},
        "Parameters" : {
          "DBName"           : "WordPressDB",
          "DBUser"           : { "Ref" : "DatabaseUser" },
          "DBPassword"       : { "Ref" : "DatabasePassword" },
          "DBInstanceClass"  : { "Ref" : "DatabaseType" },
          "AlarmTopic"       : { "Ref" : "AlarmTopic" },
          "EC2SecurityGroup" : { "Ref" : "EC2SecurityGroup" },
          "MultiAZ"          : { "Fn::FindInMap" : [ "AvailabilityMap", { "Ref" : "HighlyAvailable" }, "MultiAZDB" ]}
        }
      }
    }
  },

  "Outputs": {
    "URL": {
      "Value": { "Fn::GetAtt": [ "WordPressFrontEnd", "Outputs.URL" ] },
      "Description" : "URL of the website"
    }
  }
}