CloudFormation / CreationPolicy / AutoScalingGroup example

gistfile1.txt

{
  "Resources": {
    "AutoScalingGroup": {
      "Type": "AWS::AutoScaling::AutoScalingGroup",
      "Properties": {
        "AvailabilityZones": { "Fn::GetAZs": "" },
        "LaunchConfigurationName": { "Ref": "LaunchConfig" },
        "DesiredCapacity": "2",
        "MinSize": "1",
        "MaxSize": "4"
      },
      "CreationPolicy": {
        "ResourceSignal": {
          "Count": "2",
          "Timeout": "PT15M"
        }
      },
      "UpdatePolicy" : {
        "AutoScalingScheduledAction" : {
          "IgnoreUnmodifiedGroupSizeProperties" : "false"
        },
        "AutoScalingRollingUpdate" : {
          "MinInstancesInService" : "1",
          "MaxBatchSize" : "2",
          "PauseTime" : "PT2M",
          "WaitOnResourceSignals" : "true"
        }
      }
    },
    "LaunchConfig": {
      "Type": "AWS::AutoScaling::LaunchConfiguration",
      "Properties": {
        "ImageId": "ami-db704cb8",
        "InstanceType": "t2.micro",
        "UserData": {
          "Fn::Base64": {
            "Fn::Join" : [ "", [
              "#!/bin/bash -xe\n",
              "yum install -y aws-cfn-bootstrap\n",
              "/opt/aws/bin/cfn-signal -e 0 --stack ", { "Ref": "AWS::StackName" },
              " --resource AutoScalingGroup ",
              " --region ", { "Ref" : "AWS::Region" }, "\n"
            ] ]
          }
        }
      }
    }
  }
}