{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "autoScalingGroup": {
      "Type": "AWS::AutoScaling::AutoScalingGroup",
      "Properties": {
        "HealthCheckGracePeriod": 900,
        "HealthCheckType": "ELB",
        "LaunchConfigurationName": {
          "Ref": "launchConfiguration"
        },
        "LoadBalancerNames": [
          {
            "Ref": "elasticLoadBalancer"
          }
        ],
        "MaxSize": 3,
        "MinSize": 2,
        "Tags": [
          {
            "Key": "Name",
            "PropagateAtLaunch": true,
            "Value": {
              "Ref": "AWS::StackName"
            }
          }
        ],
        "TerminationPolicies": [
          "OldestInstance"
        ],
        "VPCZoneIdentifier": [
          "subnet-53b3596e",
          "subnet-13e6b44a"
        ]
      },
      "CreationPolicy": {
        "ResourceSignal": {
          "Count": 2,
          "Timeout": "PT15M"
        }
      },
      "UpdatePolicy": {
        "AutoScalingRollingUpdate": {
          "MaxBatchSize": 1,
          "MinInstancesInService": 1,
          "PauseTime": "PT15M",
          "WaitOnResourceSignals": true
        }
      }
    },
    "elasticLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "ConnectionDrainingPolicy": {
          "Enabled": true,
          "Timeout": 60
        },
        "CrossZone": true,
        "HealthCheck": {
          "HealthyThreshold": 3,
          "Interval": 10,
          "Target": "http:80/",
          "Timeout": 2,
          "UnhealthyThreshold": 5
        },
        "Listeners": [
          {
            "InstancePort": 80,
            "LoadBalancerPort": 80,
            "Protocol": "HTTP"
          }
        ],
        "SecurityGroups": [
          {
            "Ref": "securityGroup"
          }
        ],
        "Subnets": [
          "subnet-53b3596e",
          "subnet-13e6b44a"
        ]
      }
    },
    "launchConfiguration": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "ImageId": "ami-0d4cfd66",
        "InstanceType": "t2.micro",
        "SecurityGroups": [
          {
            "Ref": "securityGroup"
          }
        ],
        "UserData": {
          "Fn::Base64": {
            "Fn::Join": [
              "\n",
              [
                "#!/bin/bash",
                "exec > >(tee /tmp/user-data.log | logger -t user-data -s 2>/dev/console) 2>&1",
                "set -ex",
                "yum update -y",
                "yum install -y docker",
                "service docker start",
                "docker run -d -p 80:80 tutum/hello-world",
                "/opt/aws/bin/cfn-signal --resource autoScalingGroup -e $? --stack \\",
                {
                  "Ref": "AWS::StackName"
                }
              ]
            ]
          }
        }
      }
    },
    "securityGroup": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupDescription": "Generated by cirrus.",
        "SecurityGroupIngress": [
          {
            "CidrIp": "0.0.0.0/0",
            "FromPort": 80,
            "IpProtocol": "tcp",
            "ToPort": 80
          }
        ],
        "VpcId": "vpc-183bcd7c"
      }
    }
  }
}