AutoScaleのCloudFormationのサンプル

autoscale_template.json

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

  "Description" : "AWS CloudFormation Sample Template AutoScalingKeepAtNSample: Create a load balanced, Auto Scaled sample website. This example creates an Auto Scaling group behind a load balancer with a simple health check using a basic getting start AMI that has a simple Apache Web Server-based PHP page. The web site is available on port 80, however, the instances can be configured to listen on any port (8888 by default). **WARNING** This template creates one or more Amazon EC2 instances and an Elastic Load Balancer. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {
    "InstanceType" : {
      "Description" : "WebServer EC2 instance type",
      "Type" : "String",
      "Default" : "m1.small",
      "AllowedValues" : [ "t1.micro","m1.small","m1.medium","m1.large","m1.xlarge","m2.xlarge","m2.2xlarge","m2.4xlarge","m3.xlarge","m3.2xlarge","c1.medium","c1.xlarge","cc1.4xlarge","cc2.8xlarge","cg1.4xlarge"],
      "ConstraintDescription" : "must be a valid EC2 instance type."
    },
    "WebServerPort" : {
      "Description" : "TCP/IP port of the web server",
      "Type" : "String",
      "Default" : "80"
    },
    "KeyName" : {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instances",
      "Type" : "String",
      "Default" : "hogekey"
    },
    "ASMinCount": {
        "Description": "AutoScaling Min Count",
        "Type": "Number",
        "Default": "1"
    },
    "ASMaxCount": {
        "Description": "AutoScaling Max Count",
        "Type": "Number",
        "Default": "4"
    },
    "ASDesiredCapacity": {
        "Description": "AutoScaling Desired Capacity",
        "Type": "Number",
        "Default": "1"
    },
    "ASAMI": {
        "Description": "The EC2 ImageId for the Web Server",
        "Type": "String",
        "Default": "ami-xxxxxxxxx"
    }
  },

  "Resources" : {
    "WebServerGroup": {
        "Type": "AWS::AutoScaling::AutoScalingGroup",
        "UpdatePolicy" : {
            "AutoScalingRollingUpdate" : {
                "MaxBatchSize" : "1",
                "MinInstancesInService" : "1",
                "PauseTime" : "PT0S"
            }
        },
        "Properties": {
            "AvailabilityZones": {
                "Fn::GetAZs": ""
            },
            "LaunchConfigurationName": {
                "Ref": "LaunchConfig"
            },
            "MinSize": {
                "Ref": "ASMinCount"
            },
            "MaxSize": {
                "Ref": "ASMaxCount"
            },
            "DesiredCapacity": {
                "Ref": "ASDesiredCapacity"
            },
            "LoadBalancerNames": [
                {
                    "Ref": "ElasticLoadBalancer"
                }
            ]
        }
    },
    "LaunchConfig": {
        "Type": "AWS::AutoScaling::LaunchConfiguration",
        "Properties": {
            "KeyName": {
                "Ref": "KeyName"
            },
            "ImageId": {
                "Ref": "ASAMI"
            },
            "SecurityGroups": ["sg-base","sg-web"],
            "InstanceType": {
                "Ref": "InstanceType"
            }
        }
    },
    "WebServerScaleUpPolicy": {
        "Type": "AWS::AutoScaling::ScalingPolicy",
        "Properties": {
            "AdjustmentType": "ChangeInCapacity",
            "AutoScalingGroupName": {
                "Ref": "WebServerGroup"
            },
            "Cooldown": "60",
            "ScalingAdjustment": "1"
        }
    },
    "WebServerScaleDownPolicy": {
        "Type": "AWS::AutoScaling::ScalingPolicy",
        "Properties": {
            "AdjustmentType": "ChangeInCapacity",
            "AutoScalingGroupName": {
                "Ref": "WebServerGroup"
            },
            "Cooldown": "60",
            "ScalingAdjustment": "-1"
        }
    },
    "CPUAlarmHigh": {
        "Type": "AWS::CloudWatch::Alarm",
        "Properties": {
            "AlarmDescription": "Scale-up if CPU > 90% for 10 minutes",
            "MetricName": "CPUUtilization",
            "Namespace": "AWS/EC2",
            "Statistic": "Average",
            "Period": "300",
            "EvaluationPeriods": "2",
            "Threshold": "90",
            "AlarmActions": [
                {
                    "Ref": "WebServerScaleUpPolicy"
                }
            ],
            "Dimensions": [
                {
                    "Name": "AutoScalingGroupName",
                    "Value": {
                        "Ref": "WebServerGroup"
                    }
                }
            ],
            "ComparisonOperator": "GreaterThanThreshold"
        }
    },
    "CPUAlarmLow": {
        "Type": "AWS::CloudWatch::Alarm",
        "Properties": {
            "AlarmDescription": "Scale-down if CPU < 70% for 10 minutes",
            "MetricName": "CPUUtilization",
            "Namespace": "AWS/EC2",
            "Statistic": "Average",
            "Period": "300",
            "EvaluationPeriods": "2",
            "Threshold": "70",
            "AlarmActions": [
                {
                    "Ref": "WebServerScaleDownPolicy"
                }
            ],
            "Dimensions": [
                {
                    "Name": "AutoScalingGroupName",
                    "Value": {
                        "Ref": "WebServerGroup"
                    }
                }
            ],
            "ComparisonOperator": "LessThanThreshold"
        }
    },
    "ElasticLoadBalancer": {
        "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
        "Properties": {
            "AvailabilityZones": {
                "Fn::GetAZs": ""
            },
            "Listeners": [
                {
                    "LoadBalancerPort": "80",
                    "InstancePort": {
                        "Ref": "WebServerPort"
                    },
                    "Protocol": "HTTP"
                }
            ],
            "HealthCheck": {
                "Target": {
                    "Fn::Join": [
                        "",
                        [
                            "HTTP:",
                            {
                                "Ref": "WebServerPort"
                            },
                            "/"
                        ]
                    ]
                },
                "HealthyThreshold": "3",
                "UnhealthyThreshold": "5",
                "Interval": "30",
                "Timeout": "5"
            }
        }
    }
  },

  "Outputs" : {
    "URL" : {
      "Description" : "URL of the website",
      "Value" :  { "Fn::Join" : [ "", [ "http://", { "Fn::GetAtt" : [ "ElasticLoadBalancer", "DNSName" ]}]]}
    }
  }
}