cloudformation.json

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "Hello-app Example",
  "Parameters": {
    "InstanceType": {
      "Description": "WebServer EC2 instance type",
      "Type": "String",
      "Default": "t2.micro",
      "AllowedValues": [ "t1.micro", "t2.micro", "t2.small", "t2.medium", "m1.small", "m1.medium", "m1.large", "m1.xlarge", "m2.xlarge", "m2.2xlarge", "m2.4xlarge", "m3.medium", "m3.large", "m3.xlarge", "m3.2xlarge", "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", "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."
    },
    "KeyName": {
      "Description": "Name of an existing EC2 KeyPair to enable SSH access to the instance",
      "Type": "AWS::EC2::KeyPair::KeyName",
      "ConstraintDescription": "must be the name of an existing EC2 KeyPair."
    },
    "InstanceCount": {
      "Description": "Number of EC2 instances to launch",
      "Type": "Number",
      "Default": "1"
    },
    "InstanceImageId": {
      "Description": "Image ID for EC2 instances",
      "Type": "String"
    }
  },
  "Mappings" : {
  },
  "Resources" : {
    "InternetGateway" : {
      "Type" : "AWS::EC2::InternetGateway",
      "Properties" : {
        "Tags" : [ {"Key" : "Application", "Value" : { "Ref" : "AWS::StackId"} } ]
      }
    },
    "VPC" : {
      "Type" : "AWS::EC2::VPC",
      "Properties" : {
        "CidrBlock" : "10.0.0.0/16",
        "Tags" : [ {"Key" : "Application", "Value" : { "Ref" : "AWS::StackId"} } ]
      }
    },
    "AttachGateway" : {
       "Type" : "AWS::EC2::VPCGatewayAttachment",
       "Properties" : {
         "VpcId" : { "Ref" : "VPC" },
         "InternetGatewayId" : { "Ref" : "InternetGateway" }
       }
    },
    "PublicSubnet" : {
      "Type" : "AWS::EC2::Subnet",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "CidrBlock" : "10.0.1.0/24",
        "Tags" : [ {"Key" : "Application", "Value" : { "Ref" : "AWS::StackId"} } ]
      }
    },
    "RouteTable" : {
      "Type" : "AWS::EC2::RouteTable",
      "Properties" : {
        "VpcId" : {"Ref" : "VPC"},
        "Tags" : [ {"Key" : "Application", "Value" : { "Ref" : "AWS::StackId"} } ]
      }
    },
    "Route" : {
      "Type" : "AWS::EC2::Route",
      "DependsOn" : "AttachGateway",
      "Properties" : {
        "RouteTableId" : { "Ref" : "RouteTable" },
        "DestinationCidrBlock" : "0.0.0.0/0",
        "GatewayId" : { "Ref" : "InternetGateway" }
      }
    },
    "PublicSubnetRouteTableAssociation" : {
      "Type" : "AWS::EC2::SubnetRouteTableAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet" },
        "RouteTableId" : { "Ref" : "RouteTable" }
      }
    },
    "PublicSshSecurityGroup": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupDescription": "Enable external SSH access",
        "VpcId": { "Ref": "VPC" },
        "SecurityGroupIngress": [ {
          "IpProtocol": "tcp",
          "FromPort": "22",
          "ToPort": "22",
          "CidrIp": "0.0.0.0/0"
        } ]
      }
    },
    "PublicWebSecurityGroup": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupDescription": "Enable external web access",
        "VpcId": { "Ref": "VPC" },
        "SecurityGroupIngress": [
          {
            "IpProtocol": "tcp",
            "FromPort": "80",
            "ToPort": "8080",
            "CidrIp": "0.0.0.0/0"
          }
        ]
      }
    },
    "WebServerGroup" : {
      "Type" : "AWS::AutoScaling::AutoScalingGroup",
      "Properties" : {
        "AvailabilityZones" : [{ "Fn::GetAtt" : [ "PublicSubnet", "AvailabilityZone" ] }],
        "VPCZoneIdentifier" : [{ "Ref" : "PublicSubnet" }],
        "LaunchConfigurationName" : { "Ref" : "WebLaunchConfig" },
        "MinSize" : "1",
        "MaxSize" : "3",
        "DesiredCapacity" : { "Ref" : "InstanceCount" },
        "LoadBalancerNames" : [ { "Ref" : "WebElasticLoadBalancer" } ],
        "HealthCheckGracePeriod": "600",
        "HealthCheckType": "ELB"
      },
      "CreationPolicy": {
        "ResourceSignal": {
          "Count": "1",
          "Timeout": "PT10M"
        }
      },
      "UpdatePolicy": {
        "AutoScalingRollingUpdate": {
          "MinInstancesInService": "1",
          "MaxBatchSize": "1",
          "PauseTime": "PT10M",
          "WaitOnResourceSignals": "true"
        }
      }
    },
    "WebLaunchConfig": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "AssociatePublicIpAddress": "true",
        "ImageId":{
            "Ref":"InstanceImageId"
        },
        "InstanceType":{
           "Ref":"InstanceType"
        },
        "SecurityGroups": [
          { "Ref": "PublicSshSecurityGroup" },
          { "Ref": "PublicWebSecurityGroup" }
        ],
        "KeyName": { "Ref": "KeyName" },
        "UserData":{
          "Fn::Base64":{
            "Fn::Join":[
              "",
              [
                "#!/bin/bash\n",
                "cfn-init ",
                "  --resource WebLaunchConfig ",
                "  --stack ", { "Ref": "AWS::StackName" },
                "  --region ", { "Ref" : "AWS::Region" }, "\n",
                "sleep 1m\n",
                "cfn-signal -e $? ",
                "  --stack ", { "Ref": "AWS::StackName" },
                "  --resource WebServerGroup ",
                "  --region ", { "Ref" : "AWS::Region" }, "\n"
              ]
            ]
          }
        }
      },
      "Metadata" : {
        "Comment" : "Startup hello-app",
        "AWS::CloudFormation::Init" : {
          "config" : {
            "services" : {
              "sysvinit" : {
                "supervisor": {
                  "enabled": "true",
                  "ensureRunning": "true"
                }
              }
            }
          }
        }
      }
    },
    "WebElasticLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "CrossZone": "true",
        "Scheme": "internet-facing",
        "SecurityGroups": [
          { "Ref": "PublicWebSecurityGroup" }
        ],
        "Subnets": [
          { "Ref": "PublicSubnet" }
        ],
        "Listeners": [
          {
            "LoadBalancerPort": "80",
            "InstancePort": "8080",
            "Protocol": "HTTP"
          }
        ],
        "HealthCheck": {
          "Target": "HTTP:8080/",
          "HealthyThreshold": "2",
          "UnhealthyThreshold": "5",
          "Interval": "30",
          "Timeout": "2"
        }
      }
    }
  },
  "Outputs" : {
  }
}