{

"Parameters": {
  "AdminAPIScalingGroupMinSizeVar": {"Type": "Number", "MinValue": "0", "Default": "0"},
  "AdminAPIScalingGroupMaxSizeVar": {"Type": "Number", "MinValue": "1", "Default": "1"}
},


"Resources": {

"AdminAPIScalingGroup": {
  "Type": "AWS::AutoScaling::AutoScalingGroup",
  "DependsOn": "PrivateRouteThroughBastionBox",

  "UpdatePolicy": {
    "AutoScalingRollingUpdate": {
      "MinInstancesInService": {"Ref": "AdminAPIScalingGroupMinSizeVar"},
      "MaxBatchSize": "1",
      "PauseTime": "PT0S"
    }
  },

  "Properties": {
    "AvailabilityZones": [{"Fn::GetAtt": ["PrivateSubnet", "AvailabilityZone"]}],
    "VPCZoneIdentifier": [{"Ref": "PrivateSubnet"}],
    "LaunchConfigurationName": {"Ref": "BackendLaunchConfiguration"},

    "MinSize": {"Ref": "AdminAPIScalingGroupMinSizeVar"},
    "MaxSize": {"Ref": "AdminAPIScalingGroupMaxSizeVar"},
    "DesiredCapacity": {"Ref": "AdminAPIScalingGroupMinSizeVar"},

    "HealthCheckType": "ELB",
    "HealthCheckGracePeriod": "6000",
    "LoadBalancerNames": [
      {"Ref": "AdminAPILoadBalancer"}
    ],

    "TerminationPolicies": ["OldestLaunchConfiguration", "OldestInstance"],

    "MetricsCollection": [{
      "Granularity": "1Minute",
      "Metrics": ["GroupMinSize", "GroupMaxSize"]
    }]
  }
},

"BackendLaunchConfiguration" : {
  "Type" : "AWS::AutoScaling::LaunchConfiguration",

  "Metadata": {
    "AWS::CloudFormation::Init": {}
  },

  "Properties" : {
    "InstanceType": "m3.medium",
    "ImageId": {"Ref": "InstanceAMIVar"},
    "KeyName": {"Ref": "IAMKeypairNameVar"},
    "SecurityGroups": [{"Ref": "BackendSecurityGroup"}],

    "IamInstanceProfile" : {"Ref": "BackendProfile"},

    "UserData": {"Fn::Base64": {"Fn::Join": ["", [
      "#!/bin/bash\n",
      "export AWS_REGION='", {"Ref": "AWS::Region"}, "'\n",
      "export AWS_STACK_NAME='", {"Ref": "AWS::StackName"}, "'\n",
      "export AWS_INSTANCE_LOGICAL_NAME='BackendLaunchConfiguration'\n",
      "export DB_HOST='", {"Fn::GetAtt": ["DB", "Endpoint.Address"]}, "'\n",
      "export DB_PORT='", {"Fn::GetAtt": ["DB", "Endpoint.Port"]}, "'\n",
      {"Ref": "UserDataEnvironmentVar"}, "\n",
      {"Ref": "CommonRoleScriptVar"}, "\n",
      {"Ref": "BackendRoleScriptVar"}, "\n"
    ]]}}
  }
}

}

}