Create ElastiCache Redis

Creates an ElastiCache cache cluster with the Redis engine and deploys a sample PHP application.

1

Votes

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

  "Description" : "AWS CloudFormation Sample Template ElastiCache_Redis: Sample template showing how to create an Amazon ElastiCache Redis Cluster. **WARNING** This template creates an Amazon EC2 Instance and an Amazon ElastiCache Cluster. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {

    "ClusterNodeType" : {
      "Description" : "The compute and memory capacity of the nodes in the Redis Cluster",
      "Type" : "String",
      "Default" : "cache.t2.small",
      "AllowedValues" : [ "cache.m1.small", "cache.m1.large", "cache.m1.xlarge", "cache.m2.xlarge", "cache.m2.2xlarge", "cache.m2.4xlarge", "cache.c1.xlarge", "cache.t2.micro", "cache.t2.small", "cache.t2.medium", "cache.m3.medium", "cache.m3.large", "cache.m3.xlarge", "cache.m3.2xlarge", "cache.r3.large", "cache.r3.xlarge", "cache.r3.2xlarge", "cache.r3.4xlarge", "cache.r3.8xlarge" ]
,
      "ConstraintDescription" : "must select a valid Cache Node type."
    },

    "KeyName": {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the web server",
      "Type": "AWS::EC2::KeyPair::KeyName",
      "ConstraintDescription" : "must be the name of an existing EC2 KeyPair."
    },

    "InstanceType" : {
      "Description" : "WebServer 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."
    },

    "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" : {
    "AWSInstanceType2Arch" : {
      "t1.micro"    : { "Arch" : "HVM64"  },
      "t2.nano"     : { "Arch" : "HVM64"  },
      "t2.micro"    : { "Arch" : "HVM64"  },
      "t2.small"    : { "Arch" : "HVM64"  },
      "t2.medium"   : { "Arch" : "HVM64"  },
      "t2.large"    : { "Arch" : "HVM64"  },
      "m1.small"    : { "Arch" : "HVM64"  },
      "m1.medium"   : { "Arch" : "HVM64"  },
      "m1.large"    : { "Arch" : "HVM64"  },
      "m1.xlarge"   : { "Arch" : "HVM64"  },
      "m2.xlarge"   : { "Arch" : "HVM64"  },
      "m2.2xlarge"  : { "Arch" : "HVM64"  },
      "m2.4xlarge"  : { "Arch" : "HVM64"  },
      "m3.medium"   : { "Arch" : "HVM64"  },
      "m3.large"    : { "Arch" : "HVM64"  },
      "m3.xlarge"   : { "Arch" : "HVM64"  },
      "m3.2xlarge"  : { "Arch" : "HVM64"  },
      "m4.large"    : { "Arch" : "HVM64"  },
      "m4.xlarge"   : { "Arch" : "HVM64"  },
      "m4.2xlarge"  : { "Arch" : "HVM64"  },
      "m4.4xlarge"  : { "Arch" : "HVM64"  },
      "m4.10xlarge" : { "Arch" : "HVM64"  },
      "c1.medium"   : { "Arch" : "HVM64"  },
      "c1.xlarge"   : { "Arch" : "HVM64"  },
      "c3.large"    : { "Arch" : "HVM64"  },
      "c3.xlarge"   : { "Arch" : "HVM64"  },
      "c3.2xlarge"  : { "Arch" : "HVM64"  },
      "c3.4xlarge"  : { "Arch" : "HVM64"  },
      "c3.8xlarge"  : { "Arch" : "HVM64"  },
      "c4.large"    : { "Arch" : "HVM64"  },
      "c4.xlarge"   : { "Arch" : "HVM64"  },
      "c4.2xlarge"  : { "Arch" : "HVM64"  },
      "c4.4xlarge"  : { "Arch" : "HVM64"  },
      "c4.8xlarge"  : { "Arch" : "HVM64"  },
      "g2.2xlarge"  : { "Arch" : "HVMG2"  },
      "g2.8xlarge"  : { "Arch" : "HVMG2"  },
      "r3.large"    : { "Arch" : "HVM64"  },
      "r3.xlarge"   : { "Arch" : "HVM64"  },
      "r3.2xlarge"  : { "Arch" : "HVM64"  },
      "r3.4xlarge"  : { "Arch" : "HVM64"  },
      "r3.8xlarge"  : { "Arch" : "HVM64"  },
      "i2.xlarge"   : { "Arch" : "HVM64"  },
      "i2.2xlarge"  : { "Arch" : "HVM64"  },
      "i2.4xlarge"  : { "Arch" : "HVM64"  },
      "i2.8xlarge"  : { "Arch" : "HVM64"  },
      "d2.xlarge"   : { "Arch" : "HVM64"  },
      "d2.2xlarge"  : { "Arch" : "HVM64"  },
      "d2.4xlarge"  : { "Arch" : "HVM64"  },
      "d2.8xlarge"  : { "Arch" : "HVM64"  },
      "hi1.4xlarge" : { "Arch" : "HVM64"  },
      "hs1.8xlarge" : { "Arch" : "HVM64"  },
      "cr1.8xlarge" : { "Arch" : "HVM64"  },
      "cc2.8xlarge" : { "Arch" : "HVM64"  }
    },

    "AWSInstanceType2NATArch" : {
      "t1.micro"    : { "Arch" : "NATHVM64"  },
      "t2.nano"     : { "Arch" : "NATHVM64"  },
      "t2.micro"    : { "Arch" : "NATHVM64"  },
      "t2.small"    : { "Arch" : "NATHVM64"  },
      "t2.medium"   : { "Arch" : "NATHVM64"  },
      "t2.large"    : { "Arch" : "NATHVM64"  },
      "m1.small"    : { "Arch" : "NATHVM64"  },
      "m1.medium"   : { "Arch" : "NATHVM64"  },
      "m1.large"    : { "Arch" : "NATHVM64"  },
      "m1.xlarge"   : { "Arch" : "NATHVM64"  },
      "m2.xlarge"   : { "Arch" : "NATHVM64"  },
      "m2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "m3.medium"   : { "Arch" : "NATHVM64"  },
      "m3.large"    : { "Arch" : "NATHVM64"  },
      "m3.xlarge"   : { "Arch" : "NATHVM64"  },
      "m3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m4.large"    : { "Arch" : "NATHVM64"  },
      "m4.xlarge"   : { "Arch" : "NATHVM64"  },
      "m4.2xlarge"  : { "Arch" : "NATHVM64"  },
      "m4.4xlarge"  : { "Arch" : "NATHVM64"  },
      "m4.10xlarge" : { "Arch" : "NATHVM64"  },
      "c1.medium"   : { "Arch" : "NATHVM64"  },
      "c1.xlarge"   : { "Arch" : "NATHVM64"  },
      "c3.large"    : { "Arch" : "NATHVM64"  },
      "c3.xlarge"   : { "Arch" : "NATHVM64"  },
      "c3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "c3.4xlarge"  : { "Arch" : "NATHVM64"  },
      "c3.8xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.large"    : { "Arch" : "NATHVM64"  },
      "c4.xlarge"   : { "Arch" : "NATHVM64"  },
      "c4.2xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.4xlarge"  : { "Arch" : "NATHVM64"  },
      "c4.8xlarge"  : { "Arch" : "NATHVM64"  },
      "g2.2xlarge"  : { "Arch" : "NATHVMG2"  },
      "g2.8xlarge"  : { "Arch" : "NATHVMG2"  },
      "r3.large"    : { "Arch" : "NATHVM64"  },
      "r3.xlarge"   : { "Arch" : "NATHVM64"  },
      "r3.2xlarge"  : { "Arch" : "NATHVM64"  },
      "r3.4xlarge"  : { "Arch" : "NATHVM64"  },
      "r3.8xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.xlarge"   : { "Arch" : "NATHVM64"  },
      "i2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "i2.8xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.xlarge"   : { "Arch" : "NATHVM64"  },
      "d2.2xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.4xlarge"  : { "Arch" : "NATHVM64"  },
      "d2.8xlarge"  : { "Arch" : "NATHVM64"  },
      "hi1.4xlarge" : { "Arch" : "NATHVM64"  },
      "hs1.8xlarge" : { "Arch" : "NATHVM64"  },
      "cr1.8xlarge" : { "Arch" : "NATHVM64"  },
      "cc2.8xlarge" : { "Arch" : "NATHVM64"  }
    }
,
    "AWSRegionArch2AMI" : {
      "us-east-1"        : {"HVM64" : "ami-0080e4c5bc078760e", "HVMG2" : "ami-0aeb704d503081ea6"},
      "us-west-2"        : {"HVM64" : "ami-01e24be29428c15b2", "HVMG2" : "ami-0fe84a5b4563d8f27"},
      "us-west-1"        : {"HVM64" : "ami-0ec6517f6edbf8044", "HVMG2" : "ami-0a7fc72dc0e51aa77"},
      "eu-west-1"        : {"HVM64" : "ami-08935252a36e25f85", "HVMG2" : "ami-0d5299b1c6112c3c7"},
      "eu-west-2"        : {"HVM64" : "ami-01419b804382064e4", "HVMG2" : "NOT_SUPPORTED"},
      "eu-west-3"        : {"HVM64" : "ami-0dd7e7ed60da8fb83", "HVMG2" : "NOT_SUPPORTED"},
      "eu-central-1"     : {"HVM64" : "ami-0cfbf4f6db41068ac", "HVMG2" : "ami-0aa1822e3eb913a11"},
      "eu-north-1"       : {"HVM64" : "ami-86fe70f8", "HVMG2" : "ami-32d55b4c"},
      "ap-northeast-1"   : {"HVM64" : "ami-00a5245b4816c38e6", "HVMG2" : "ami-09d0e0e099ecabba2"},
      "ap-northeast-2"   : {"HVM64" : "ami-00dc207f8ba6dc919", "HVMG2" : "NOT_SUPPORTED"},
      "ap-northeast-3"   : {"HVM64" : "ami-0b65f69a5c11f3522", "HVMG2" : "NOT_SUPPORTED"},
      "ap-southeast-1"   : {"HVM64" : "ami-05b3bcf7f311194b3", "HVMG2" : "ami-0e46ce0d6a87dc979"},
      "ap-southeast-2"   : {"HVM64" : "ami-02fd0b06f06d93dfc", "HVMG2" : "ami-0c0ab057a101d8ff2"},
      "ap-south-1"       : {"HVM64" : "ami-0ad42f4f66f6c1cc9", "HVMG2" : "ami-0244c1d42815af84a"},
      "us-east-2"        : {"HVM64" : "ami-0cd3dfa4e37921605", "HVMG2" : "NOT_SUPPORTED"},
      "ca-central-1"     : {"HVM64" : "ami-07423fb63ea0a0930", "HVMG2" : "NOT_SUPPORTED"},
      "sa-east-1"        : {"HVM64" : "ami-05145e0b28ad8e0b2", "HVMG2" : "NOT_SUPPORTED"},
      "cn-north-1"       : {"HVM64" : "ami-053617c9d818c1189", "HVMG2" : "NOT_SUPPORTED"},
      "cn-northwest-1"   : {"HVM64" : "ami-0f7937761741dc640", "HVMG2" : "NOT_SUPPORTED"}
    }
,
    "Region2Principal" : {
      "us-east-1"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "us-west-2"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "us-west-1"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "eu-west-1"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "eu-west-2"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "eu-west-3"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-southeast-1" : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-northeast-1" : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-northeast-2" : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-northeast-3" : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-southeast-2" : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ap-south-1"     : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "us-east-2"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "ca-central-1"   : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "sa-east-1"      : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "cn-north-1"     : { "EC2Principal" : "ec2.amazonaws.com.cn", "OpsWorksPrincipal" : "opsworks.amazonaws.com.cn" },
      "cn-northwest-1" : { "EC2Principal" : "ec2.amazonaws.com.cn", "OpsWorksPrincipal" : "opsworks.amazonaws.com.cn" },
      "eu-central-1"   : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" },
      "eu-north-1"     : { "EC2Principal" : "ec2.amazonaws.com", "OpsWorksPrincipal" : "opsworks.amazonaws.com" }
    }

  },

  "Resources" : {   

    "RedisCluster" : {
      "Type": "AWS::ElastiCache::CacheCluster",
      "Properties": {
        "CacheNodeType"           : { "Ref" : "ClusterNodeType" },
        "CacheSecurityGroupNames" : [ { "Ref" : "RedisClusterSecurityGroup" } ],
        "Engine"                  : "redis",
        "NumCacheNodes"           : "1"
      }
    },

    "RedisClusterSecurityGroup": {
      "Type": "AWS::ElastiCache::SecurityGroup",
      "Properties": {
        "Description"  : "Lock the cluster down"
      }
    },

    "RedisClusterSecurityGroupIngress": {
      "Type": "AWS::ElastiCache::SecurityGroupIngress",
      "Properties": {
        "CacheSecurityGroupName"  : { "Ref" : "RedisClusterSecurityGroup" },
        "EC2SecurityGroupName"    : { "Ref" : "WebServerSecurityGroup" }
      }        
    },

    "WebServerRole": {
      "Type": "AWS::IAM::Role",
      "Properties" : {
        "AssumeRolePolicyDocument" : {
          "Statement"  : [{
            "Effect"   : "Allow",
            "Principal": { "Service": [{ "Fn::FindInMap" : ["Region2Principal", {"Ref" : "AWS::Region"}, "EC2Principal"]}] },
            "Action"   : [ "sts:AssumeRole" ]
          } ]
        },
        "Path": "/"
      }
    },

    "WebServerRolePolicy": {
      "Type": "AWS::IAM::Policy",
      "Properties": {
        "PolicyName" : "WebServerRole",
        "PolicyDocument" : {
          "Statement"  : [ {
            "Effect"   : "Allow",
            "Action"   : "elasticache:DescribeCacheClusters",
            "Resource" : "*"
          } ]
        },
        "Roles": [ { "Ref": "WebServerRole" } ]
      }
    },

    "WebServerInstanceProfile": {
      "Type": "AWS::IAM::InstanceProfile",
      "Properties": {
        "Path": "/",
        "Roles": [ { "Ref": "WebServerRole" } ]
      }
    },

    "WebServerSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Enable HTTP and SSH access",
        "SecurityGroupIngress" : [
          {"IpProtocol" : "tcp", "FromPort" : "22", "ToPort" : "22", "CidrIp" : { "Ref" : "SSHLocation"} },
          {"IpProtocol" : "tcp", "FromPort" : "80", "ToPort" : "80", "CidrIp" : "0.0.0.0/0"}
        ]
      }      
    },  

    "WebServerInstance": {  
      "Type" : "AWS::EC2::Instance",
      "Metadata" : {
        "AWS::CloudFormation::Init" : {
          "config" : {
            "packages" : {
              "yum" : {
                "httpd"     : [],
                "php"       : [],
                "php-devel" : [],
                "gcc"       : [],
                "make"      : []
              }
            },

            "files" : {
              "/var/www/html/index.php" : {
                "content" : { "Fn::Join" : ["", [
                  "<?php\n",
                  "echo \"<h1>AWS CloudFormation sample application for Amazon ElastiCache Redis Cluster</h1>\";\n",
                  "\n",
                  "$cluster_config = json_decode(file_get_contents('/tmp/cacheclusterconfig'), true);\n",
                  "$endpoint = $cluster_config['CacheClusters'][0]['CacheNodes'][0]['Endpoint']['Address'];\n",
                  "$port = $cluster_config['CacheClusters'][0]['CacheNodes'][0]['Endpoint']['Port'];\n",
                  "\n",
                  "echo \"<p>Connecting to Redis Cache Cluster node '{$endpoint}' on port {$port}</p>\";\n",
                  "\n",
                  "$redis=new Redis();\n",
                  "$redis->connect($endpoint, $port);\n",
                  "$redis->set('testkey', 'Hello World!');\n",
                  "$return = $redis->get('testkey');\n",
                  "\n",
                  "echo \"<p>Retrieved value: $return</p>\";\n",
                  "?>\n"
                ]]},
                "mode"    : "000644",
                "owner"   : "apache",
                "group"   : "apache"
              },
              "/etc/cron.d/get_cluster_config" : {
                "content" : "*/5 * * * * root /usr/local/bin/get_cluster_config",
                "mode"    : "000644",
                "owner"   : "root",
                "group"   : "root"
              },
              "/usr/local/bin/get_cluster_config" : {
                "content" : { "Fn::Join" : ["", [
                  "#! /bin/bash\n",
                  "aws elasticache describe-cache-clusters ",
                  "         --cache-cluster-id ", {"Ref" : "RedisCluster"},
                  "         --show-cache-node-info --region ", { "Ref" : "AWS::Region" }, " > /tmp/cacheclusterconfig\n"
                ]]},
                "mode"    : "000755",
                "owner"   : "root",
                "group"   : "root"
              },
              "/usr/local/bin/install_phpredis" : {
                "content" : { "Fn::Join" : ["", [
                  "#! /bin/bash\n",
                  "cd /tmp\n",
                  "wget https://github.com/nicolasff/phpredis/zipball/master -O phpredis.zip\n",
                  "unzip phpredis.zip\n",
                  "cd nicolasff-phpredis-*\n",
                  "phpize\n",
                  "./configure\n",
                  "make && make install\n",
                  "touch /etc/php.d/redis.ini\n",
                  "echo extension=redis.so > /etc/php.d/redis.ini\n"
                ]]},
                "mode"    : "000755",
                "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.WebServerInstance.Metadata.AWS::CloudFormation::Init\n",
                  "action=/opt/aws/bin/cfn-init -v ",
                  "         --stack ", { "Ref" : "AWS::StackName" },
                  "         --resource WebServerInstance ",
                  "         --region ", { "Ref" : "AWS::Region" }, "\n",
                  "runas=root\n"
                ]]},
        "mode"    : "000400",
        "owner"   : "root",
                "group"   : "root"
              }
            },

            "commands" : {
              "01-install_phpredis" : {
                "command" : "/usr/local/bin/install_phpredis"
              },
              "02-get-cluster-config" : {
                "command" : "/usr/local/bin/get_cluster_config"
              }
            },

            "services" : {
              "sysvinit" : {
                "httpd"    : { "enabled" : "true", "ensureRunning" : "true" },
                "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" : "InstanceType" }, "Arch"  ]}]},
        "InstanceType"   : { "Ref" : "InstanceType" },
        "SecurityGroups" : [ {"Ref" : "WebServerSecurityGroup"} ],
        "KeyName"        : { "Ref" : "KeyName" },
        "IamInstanceProfile": { "Ref": "WebServerInstanceProfile" },
        "UserData"       : { "Fn::Base64" : { "Fn::Join" : ["", [
          "#!/bin/bash -xe\n",
          "yum update -y aws-cfn-bootstrap\n",

          "# Setup the PHP sample application\n",
          "/opt/aws/bin/cfn-init -v ",
          "         --stack ", { "Ref" : "AWS::StackName" }, 
          "         --resource WebServerInstance ",
          "         --region ", { "Ref" : "AWS::Region" }, "\n",

          "# Signal the status of cfn-init\n",
          "/opt/aws/bin/cfn-signal -e $? ",
          "         --stack ", { "Ref" : "AWS::StackName" }, 
          "         --resource WebServerInstance ",
          "         --region ", { "Ref" : "AWS::Region" }, "\n"
        ]]}}        
      },
      "CreationPolicy" : {
        "ResourceSignal" : {
          "Timeout" : "PT15M"
        }
      }
    }
  },

  "Outputs" : {
    "WebsiteURL" : {
      "Description" : "Application URL",
      "Value" : { "Fn::Join" : ["", ["http://", { "Fn::GetAtt" : [ "WebServerInstance", "PublicDnsName" ]} ]] }
    }
  }
}

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