Amazon AppStream 2.0のスケーリング設定をおさらいする

# コマンド実行例
C:\> aws application-autoscaling describe-scaling-policies --service-namespace appstream --resource-id "fleet/my-test-fleet"
{
    "ScalingPolicies": [
        {
            "PolicyARN": "arn:aws:autoscaling:ap-northeast-1:xxxxxxxxxxxx:scalingPolicy:1edc4f22-f987-4e60-9d19-abdff44f8cd1:resource/appstream/fleet/my-test-fleet:policyName/default-scale-in-1",
            "PolicyName": "default-scale-in-1",
            "ServiceNamespace": "appstream",
            "ResourceId": "fleet/my-test-fleet",
            "ScalableDimension": "appstream:fleet:DesiredCapacity",
            "PolicyType": "StepScaling",
            "StepScalingPolicyConfiguration": {
                "AdjustmentType": "ChangeInCapacity",
                "StepAdjustments": [
                    {
                        "MetricIntervalUpperBound": 0.0,
                        "ScalingAdjustment": -1
                    }
                ],
                "Cooldown": 360,
                "MetricAggregationType": "Average"
            },
            "Alarms": [
                {
                    "AlarmName": "Appstream2-my-test-fleet-default-scale-in-1-Alarm",
                    "AlarmARN": "arn:aws:cloudwatch:ap-northeast-1:xxxxxxxxxxxx:alarm:Appstream2-my-test-fleet-default-scale-in-1-Alarm"
                }
            ],
            "CreationTime": "2022-02-07T12:58:34.198000+09:00"
        },
        {
            "PolicyARN": "arn:aws:autoscaling:ap-northeast-1:xxxxxxxxxxxx:scalingPolicy:1edc4f22-f987-4e60-9d19-abdff44f8cd1:resource/appstream/fleet/my-test-fleet:policyName/default-scale-out-1",
            "PolicyName": "default-scale-out-1",
            "ServiceNamespace": "appstream",
            "ResourceId": "fleet/my-test-fleet",
            "ScalableDimension": "appstream:fleet:DesiredCapacity",
            "PolicyType": "StepScaling",
            "StepScalingPolicyConfiguration": {
                "AdjustmentType": "ChangeInCapacity",
                "StepAdjustments": [
                    {
                        "MetricIntervalLowerBound": 0.0,
                        "ScalingAdjustment": 2
                    }
                ],
                "Cooldown": 120,
                "MetricAggregationType": "Average"
            },
            "Alarms": [
                {
                    "AlarmName": "Appstream2-my-test-fleet-default-scale-out-1-Alarm",
                    "AlarmARN": "arn:aws:cloudwatch:ap-northeast-1:xxxxxxxxxxxx:alarm:Appstream2-my-test-fleet-default-scale-out-1-Alarm"
                }
            ],
            "CreationTime": "2022-02-07T12:58:34.741000+09:00"
        }
    ]
}

# コマンド実行例
C:\> aws application-autoscaling describe-scheduled-actions --service-namespace appstream --resource-id "fleet/my-test-fleet"
{
    "ScheduledActions": [
        {
            "ScheduledActionName": "daily-morning",
            "ScheduledActionARN": "arn:aws:autoscaling:ap-northeast-1:xxxxxxxxxxxx:scheduledAction:1edc4f22-f987-4e60-9d19-abdff44f8cd1:resource/appstream/fleet/my-test-fleet:scheduledActionName/daily-morning",
            "ServiceNamespace": "appstream",
            "Schedule": "cron(0 22 * * ? *)",
            "ResourceId": "fleet/my-test-fleet",
            "ScalableDimension": "appstream:fleet:DesiredCapacity",
            "StartTime": "2022-02-01T09:00:00+09:00",
            "ScalableTargetAction": {
                "MinCapacity": 5,
                "MaxCapacity": 10
            },
            "CreationTime": "2022-02-07T17:48:33.910000+09:00"
        },
        {
            "ScheduledActionName": "daily-evening",
            "ScheduledActionARN": "arn:aws:autoscaling:ap-northeast-1:xxxxxxxxxxxx:scheduledAction:1edc4f22-f987-4e60-9d19-abdff44f8cd1:resource/appstream/fleet/my-test-fleet:scheduledActionName/daily-evening",
            "ServiceNamespace": "appstream",
            "Schedule": "cron(0 13 * * ? *)",
            "ResourceId": "fleet/my-test-fleet",
            "ScalableDimension": "appstream:fleet:DesiredCapacity",
            "StartTime": "2022-02-01T09:00:00+09:00",
            "ScalableTargetAction": {
                "MinCapacity": 1,
                "MaxCapacity": 3
            },
            "CreationTime": "2022-02-07T17:48:34.194000+09:00"
        }
    ]
}

# AWS CLI on PowerShell での実行例
$resourceId = "fleet/my-test-fleet"
$json = @"
{
  "PolicyName":"target-tracking-scaling-policy",
  "ServiceNamespace":"appstream",
  "ResourceId":"$resourceId",
  "ScalableDimension":"appstream:fleet:DesiredCapacity",
  "PolicyType":"TargetTrackingScaling",
  "TargetTrackingScalingPolicyConfiguration":{
    "TargetValue":80.0,
    "PredefinedMetricSpecification":{
      "PredefinedMetricType":"AppStreamAverageCapacityUtilization"
    },
    "ScaleOutCooldown":300,
    "ScaleInCooldown":300
  }
}
"@ -replace '"','\"'
aws application-autoscaling put-scaling-policy --cli-input-json $json

# コマンド実行結果
C:\> aws application-autoscaling put-scaling-policy --cli-input-json $json
{
    "PolicyARN": "arn:aws:autoscaling:ap-northeast-1:xxxxxxxxxxxx:scalingPolicy:1edc4f22-f987-4e60-9d19-abdff44f8cd1:resource/appstream/fleet/my-test-fleet:policyName/target-tracking-scaling-policy",
    "Alarms": [
        {
            "AlarmName": "TargetTracking-fleet/my-test-fleet-AlarmHigh-404bd8fc-16ae-4fe0-abf1-fa044883bc26",
            "AlarmARN": "arn:aws:cloudwatch:ap-northeast-1:xxxxxxxxxxxx:alarm:TargetTracking-fleet/my-test-fleet-AlarmHigh-404bd8fc-16ae-4fe0-abf1-fa044883bc26"
        },
        {
            "AlarmName": "TargetTracking-fleet/my-test-fleet-AlarmLow-5cfe33eb-ddb1-4b96-b98d-acadc164066c",
            "AlarmARN": "arn:aws:cloudwatch:ap-northeast-1:xxxxxxxxxxxx:alarm:TargetTracking-fleet/my-test-fleet-AlarmLow-5cfe33eb-ddb1-4b96-b98d-acadc164066c"
        }
    ]
}

# ポリシー削除例 on PowerShell
aws application-autoscaling delete-scaling-policy --service-namespace appstream `
    --resource-id "fleet/my-test-fleet" `
    --policy-name "target-tracking-scaling-policy" `
    --scalable-dimension "appstream:fleet:DesiredCapacity"