{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "AWS CloudFormation Example Template Copyright 2012 Serverworks Co, Ltd. All Rights Reserved",

  "Parameters" : {
    "InstanceType" : {
      "Type"                  : "String",
      "Description"           : "Instance Type: t1.micro, m1.small, c1.medium, m1.medium, m1.large, m1.xlarge, m2.xlarge, m2.2xlarge, m2.4xlarge, c1.xlarge.",
      "Default"               : "t1.micro",
      "AllowedValues"         : [ "t1.micro","m1.small","c1.medium","m1.medium","m1.large","m1.xlarge","m2.xlarge","m2.2xlarge","m2.4xlarge","c1.xlarge" ],
      "ConstraintDescription" : "must be a valid Amazon EC2 instance type."
    },
    "KeyPair" : {
      "Type"                  : "String",
      "Description"           : "input the target key pear.",
      "Default"               : "foo_key_pair",
      "ConstraintDescription" : "must be a valid Amazon EC2 key pear."
    },
    "FrontFQDN" : {
      "Type" : "String",
      "Description" : "input the front service fqdn.",
      "Default"     : "wwww.example.com",
      "ConstraintDescription" : "must be a valid front fqdn."
    },
    "DBPassword" : {
      "Type" : "String",
      "Description" : "input the user Database Password.",
      "Default"     : "passwordpassword",
      "ConstraintDescription" : "must be a valid Database Password."
    }
  },
  "Resources": {
    "LoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "AvailabilityZones": [
          "ap-northeast-1a",
          "ap-northeast-1b"
        ],
        "HealthCheck": {
          "HealthyThreshold": "10",
          "Interval": "30",
          "Target": "HTTP:80/foo.php",
          "Timeout": "5",
          "UnhealthyThreshold": "2"
        },
        "Listeners": [
          {
            "InstancePort": "80",
            "LoadBalancerPort": "80",
            "Protocol": "HTTP",
            "PolicyNames": [
            ]
          }
        ]
      }
    },
    "S3Log": {
      "Type": "AWS::S3::Bucket"
    },
    "CloudFront": {
      "Type" : "AWS::CloudFront::Distribution",
      "Properties" : {
        "DistributionConfig" : {
          "Aliases" : [ { "Ref": "FrontFQDN" } ],
          "DefaultRootObject" : "index.html",
          "Origins" : [ {
            "Id" : "Dynamic Origin",
            "DomainName" : { "Fn::GetAtt" : [ "LoadBalancer", "DNSName" ] },
            "CustomOriginConfig" : { "OriginProtocolPolicy" : "http-only" }
          } ],
          "DefaultCacheBehavior" : {
            "TargetOriginId" : "Dynamic Origin",
            "ForwardedValues" : { "QueryString" : "true" },
            "ViewerProtocolPolicy" : "allow-all"
          },
          "Logging" : {
            "Bucket" : { "Fn::Join" : ["", [{ "Ref": "S3Log" }, ".s3.amazonaws.com"]] },
            "Prefix" : ""
          },
          "Enabled" : "true"
        }
      }
    },
    "AutoScalingGroup": {
      "Type": "AWS::AutoScaling::AutoScalingGroup",
      "Properties": {
        "AvailabilityZones": [
          "ap-northeast-1a",
          "ap-northeast-1b"
        ],
        "Cooldown": "300",
        "DesiredCapacity": "2",
        "MaxSize": "10",
        "MinSize": "2",
        "LaunchConfigurationName": { "Ref": "LaunchConfiguration" },
        "LoadBalancerNames": [ { "Ref": "LoadBalancer" } ]
      }
    },
    "LaunchConfiguration": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "KeyName": { "Ref": "KeyPair" }
        "ImageId": "ami-2819aa29",
        "InstanceType": { "Ref": "InstanceType" },
        "SecurityGroups": [ { "Ref": "FrontSecurity" } ],
        "UserData" : { "Fn::Base64" : { "Fn::Join" : [ "", [
          "#!/bin/bash\n",
          "yum install -y git httpd php php-mysql\n",
          "/sbin/chkconfig httpd on\n",
          "/etc/init.d/httpd start\n",
          "git clone git://github.com/kachina/cloudformation_blog.git /tmp/cloudformation_blog\n",
          "cp /tmp/cloudformation_blog/* /var/www/html/\n",

          "sed -i \"s/^CF_PARAM_RDS_END_POINT*/  $end_point = '", { "Fn::GetAtt" : [ "RDS", "Endpoint.Address" ] }, "';/g\" /var/www/html/foo.php\n",
          "sed -i \"s/^CF_PARAM_RDS_PASSWORD*/  $password = '", { "Ref" : "DBPassword" }, "'/g\" /var/www/html/foo.php\n"
        ] ] } }
      }
    },
    "CPUAlarmHigh": {
     "Type": "AWS::CloudWatch::Alarm",
     "Properties": {
        "AlarmDescription": "Scale-up if CPU > 80% for 5 minutes",
        "MetricName": "CPUUtilization",
        "Namespace": "AWS/EC2",
        "Statistic": "Average",
        "Period": "300",
        "EvaluationPeriods": "2",
        "Threshold": "90",
        "AlarmActions": [ { "Ref": "WebServerScaleUpPolicy" } ],
        "Dimensions": [
          {
            "Name": "AutoScalingGroupName",
            "Value": { "Ref": "AutoScalingGroup" }
          }
        ],
        "ComparisonOperator": "GreaterThanThreshold"
      }
    },
    "WebServerScaleUpPolicy" : {
      "Type" : "AWS::AutoScaling::ScalingPolicy",
      "Properties" : {
        "AdjustmentType" : "ChangeInCapacity",
        "AutoScalingGroupName" : { "Ref" : "AutoScalingGroup" },
        "Cooldown" : "60",
        "ScalingAdjustment" : "1"
      }
    },
    "CPUAlarmLow": {
     "Type": "AWS::CloudWatch::Alarm",
     "Properties": {
        "AlarmDescription": "Scale-down if CPU < 60% for 5 minutes",
        "MetricName": "CPUUtilization",
        "Namespace": "AWS/EC2",
        "Statistic": "Average",
        "Period": "300",
        "EvaluationPeriods": "2",
        "Threshold": "70",
        "AlarmActions": [ { "Ref": "WebServerScaleDownPolicy" } ],
        "Dimensions": [
          {
            "Name": "AutoScalingGroupName",
            "Value": { "Ref": "AutoScalingGroup" }
          }
        ],
        "ComparisonOperator": "LessThanThreshold"
      }
    },
    "WebServerScaleDownPolicy" : {
      "Type" : "AWS::AutoScaling::ScalingPolicy",
      "Properties" : {
        "AdjustmentType" : "ChangeInCapacity",
        "AutoScalingGroupName" : { "Ref" : "AutoScalingGroup" },
        "Cooldown" : "60",
        "ScalingAdjustment" : "-1"
      }
    },
    "RDS": {
      "Type": "AWS::RDS::DBInstance",
      "Properties": {
        "AllocatedStorage": "5",
        "BackupRetentionPeriod": "0",
        "DBInstanceClass": "db.m1.small",
        "DBName": "cf_db",
        "Engine": "mysql",
        "EngineVersion": "5.5.20",
        "MasterUsername": "root",
        "MasterUserPassword": { "Ref": "DBPassword" },
        "Port": "3306",
        "PreferredBackupWindow": "19:30-20:00",
        "PreferredMaintenanceWindow": "sat:00:00-sat:00:30",
        "DBSecurityGroups": [ { "Ref": "DBSecurity" } ],
        "MultiAZ" : "true",
        "BackupRetentionPeriod" : "5",
        "PreferredBackupWindow": "05:00-06:00"
      }
    },
    "FrontSecurity": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupDescription": "FrontSecurity",
        "SecurityGroupIngress": [
          {
            "IpProtocol": "tcp",
            "FromPort": "22",
            "ToPort": "22",
            "CidrIp": "0.0.0.0/0"
          },
          {
            "IpProtocol": "tcp",
            "FromPort": "80",
            "ToPort": "80",
            "CidrIp": "0.0.0.0/0"
          }
        ]
      }
    },
    "DBSecurity": {
      "Type": "AWS::RDS::DBSecurityGroup",
      "Properties": {
        "GroupDescription": "example",
        "DBSecurityGroupIngress": [
          { "EC2SecurityGroupName": { "Ref": "FrontSecurity"} }
        ]
      }
    }
  },
  "Outputs" : {
    "FrontDNS" : {
      "Value" : { "Fn::Join" : [ "", [ { "Fn::GetAtt" : [ "CloudFront", "DomainName" ] }, " IN CNAME ", { "Ref": "FrontFQDN" } ] ] },
      "Description" : "Please set this value in the DNS parameters."
    }
  }
}