describe-scaling-policies¶

Description¶

Describes the Application Auto Scaling scaling policies for the specified service namespace.

You can filter the results using ResourceId , ScalableDimension , and PolicyNames .

For more information, see Target Tracking Scaling Policies and Step Scaling Policies in the Application Auto Scaling User Guide .

Synopsis¶

  describe-scaling-policies
[--policy-names <value>]
--service-namespace <value>
[--resource-id <value>]
[--scalable-dimension <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]

Options¶

--policy-names (list)

The names of the scaling policies to describe.

(string)

Syntax:

"string" "string" ...

--service-namespace (string)

The namespace of the AWS service that provides the resource. For a resource provided by your own application or service, use custom-resource instead.

Possible values:

ecs

elasticmapreduce

ec2

appstream

dynamodb

rds

sagemaker

custom-resource

comprehend

lambda

cassandra

--resource-id (string)

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier. If you specify a scalable dimension, you must also specify a resource ID.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp .

Spot Fleet request - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .

EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .

AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .

DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table .

DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .

Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .

Amazon SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .

Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository .

Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .

Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST . Example: function:my-function:prod or function:my-function:1 .

Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .

--scalable-dimension (string)

The scalable dimension. This string consists of the service namespace, resource type, and scaling property. If you specify a scalable dimension, you must also specify a resource ID.

ecs:service:DesiredCount - The desired task count of an ECS service.

ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet request.

elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.

appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.

dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.

dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.

dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.

dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.

rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.

sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for an Amazon SageMaker model endpoint variant.

custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.

comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.

lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.

cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.

cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.

Possible values:

ecs:service:DesiredCount

ec2:spot-fleet-request:TargetCapacity

elasticmapreduce:instancegroup:InstanceCount

appstream:fleet:DesiredCapacity

dynamodb:table:ReadCapacityUnits

dynamodb:table:WriteCapacityUnits

dynamodb:index:ReadCapacityUnits

dynamodb:index:WriteCapacityUnits

rds:cluster:ReadReplicaCount

sagemaker:variant:DesiredInstanceCount

custom-resource:ResourceType:Property

comprehend:document-classifier-endpoint:DesiredInferenceUnits

lambda:function:ProvisionedConcurrency

cassandra:table:ReadCapacityUnits

cassandra:table:WriteCapacityUnits

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.

Examples¶

To describe scaling policies

This example command describes the scaling policies for the ecs service namespace.

Command:

aws application-autoscaling describe-scaling-policies --service-namespace ecs

Output:

{
    "ScalingPolicies": [
        {
            "PolicyName": "web-app-cpu-gt-75",
            "ScalableDimension": "ecs:service:DesiredCount",
            "ResourceId": "service/default/web-app",
            "CreationTime": 1462561899.23,
            "StepScalingPolicyConfiguration": {
                "Cooldown": 60,
                "StepAdjustments": [
                    {
                        "ScalingAdjustment": 200,
                        "MetricIntervalLowerBound": 0.0
                    }
                ],
                "AdjustmentType": "PercentChangeInCapacity"
            },
            "PolicyARN": "arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/web-app-cpu-gt-75",
            "PolicyType": "StepScaling",
            "Alarms": [
                {
                    "AlarmName": "web-app-cpu-gt-75",
                    "AlarmARN": "arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-gt-75"
                }
            ],
            "ServiceNamespace": "ecs"
        },
        {
            "PolicyName": "web-app-cpu-lt-25",
            "ScalableDimension": "ecs:service:DesiredCount",
            "ResourceId": "service/default/web-app",
            "CreationTime": 1462562575.099,
            "StepScalingPolicyConfiguration": {
                "Cooldown": 1,
                "StepAdjustments": [
                    {
                        "ScalingAdjustment": -50,
                        "MetricIntervalUpperBound": 0.0
                    }
                ],
                "AdjustmentType": "PercentChangeInCapacity"
            },
            "PolicyARN": "arn:aws:autoscaling:us-west-2:012345678910:scalingPolicy:6d8972f3-efc8-437c-92d1-6270f29a66e7:resource/ecs/service/default/web-app:policyName/web-app-cpu-lt-25",
            "PolicyType": "StepScaling",
            "Alarms": [
                {
                    "AlarmName": "web-app-cpu-lt-25",
                    "AlarmARN": "arn:aws:cloudwatch:us-west-2:012345678910:alarm:web-app-cpu-lt-25"
                }
            ],
            "ServiceNamespace": "ecs"
        }
    ]
}

Output¶

ScalingPolicies -> (list)

Information about the scaling policies.

(structure)

Represents a scaling policy to use with Application Auto Scaling.

PolicyARN -> (string)

The Amazon Resource Name (ARN) of the scaling policy.

PolicyName -> (string)

The name of the scaling policy.

ServiceNamespace -> (string)

The namespace of the AWS service that provides the resource, or a custom-resource .

ResourceId -> (string)

The identifier of the resource associated with the scaling policy. This string consists of the resource type and unique identifier.

ECS service - The resource type is service and the unique identifier is the cluster name and service name. Example: service/default/sample-webapp .

Spot Fleet request - The resource type is spot-fleet-request and the unique identifier is the Spot Fleet request ID. Example: spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .

EMR cluster - The resource type is instancegroup and the unique identifier is the cluster ID and instance group ID. Example: instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .

AppStream 2.0 fleet - The resource type is fleet and the unique identifier is the fleet name. Example: fleet/sample-fleet .

DynamoDB table - The resource type is table and the unique identifier is the table name. Example: table/my-table .

DynamoDB global secondary index - The resource type is index and the unique identifier is the index name. Example: table/my-table/index/my-table-index .

Aurora DB cluster - The resource type is cluster and the unique identifier is the cluster name. Example: cluster:my-db-cluster .

Amazon SageMaker endpoint variant - The resource type is variant and the unique identifier is the resource ID. Example: endpoint/my-end-point/variant/KMeansClustering .

Custom resources are not supported with a resource type. This parameter must specify the OutputValue from the CloudFormation template stack used to access the resources. The unique identifier is defined by the service provider. More information is available in our GitHub repository .

Amazon Comprehend document classification endpoint - The resource type and unique identifier are specified using the endpoint ARN. Example: arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE .

Lambda provisioned concurrency - The resource type is function and the unique identifier is the function name with a function version or alias name suffix that is not $LATEST . Example: function:my-function:prod or function:my-function:1 .

Amazon Keyspaces table - The resource type is table and the unique identifier is the table name. Example: keyspace/mykeyspace/table/mytable .

ScalableDimension -> (string)

The scalable dimension. This string consists of the service namespace, resource type, and scaling property.

ecs:service:DesiredCount - The desired task count of an ECS service.

ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet request.

elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR Instance Group.

appstream:fleet:DesiredCapacity - The desired capacity of an AppStream 2.0 fleet.

dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a DynamoDB table.

dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a DynamoDB table.

dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a DynamoDB global secondary index.

dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a DynamoDB global secondary index.

rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB cluster. Available for Aurora MySQL-compatible edition and Aurora PostgreSQL-compatible edition.

sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for an Amazon SageMaker model endpoint variant.

custom-resource:ResourceType:Property - The scalable dimension for a custom resource provided by your own application or service.

comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number of inference units for an Amazon Comprehend document classification endpoint.

lambda:function:ProvisionedConcurrency - The provisioned concurrency for a Lambda function.

cassandra:table:ReadCapacityUnits - The provisioned read capacity for an Amazon Keyspaces table.

cassandra:table:WriteCapacityUnits - The provisioned write capacity for an Amazon Keyspaces table.

PolicyType -> (string)

The scaling policy type.

StepScalingPolicyConfiguration -> (structure)

A step scaling policy.

AdjustmentType -> (string)

Specifies whether the ScalingAdjustment value in a StepAdjustment is an absolute number or a percentage of the current capacity.

AdjustmentType is required if you are adding a new step scaling policy configuration.

StepAdjustments -> (list)

A set of adjustments that enable you to scale based on the size of the alarm breach.

At least one step adjustment is required if you are adding a new step scaling policy configuration.

(structure)

Represents a step adjustment for a StepScalingPolicyConfiguration . Describes an adjustment based on the difference between the value of the aggregated CloudWatch metric and the breach threshold that you’ve defined for the alarm.

For the following examples, suppose that you have an alarm with a breach threshold of 50:

To trigger the adjustment when the metric is greater than or equal to 50 and less than 60, specify a lower bound of 0 and an upper bound of 10.

To trigger the adjustment when the metric is greater than 40 and less than or equal to 50, specify a lower bound of -10 and an upper bound of 0.

There are a few rules for the step adjustments for your step policy:

The ranges of your step adjustments can’t overlap or have a gap.

At most one step adjustment can have a null lower bound. If one step adjustment has a negative lower bound, then there must be a step adjustment with a null lower bound.

At most one step adjustment can have a null upper bound. If one step adjustment has a positive upper bound, then there must be a step adjustment with a null upper bound.

The upper and lower bound can’t be null in the same step adjustment.

MetricIntervalLowerBound -> (double)

The lower bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the lower bound is inclusive (the metric must be greater than or equal to the threshold plus the lower bound). Otherwise, it is exclusive (the metric must be greater than the threshold plus the lower bound). A null value indicates negative infinity.

MetricIntervalUpperBound -> (double)

The upper bound for the difference between the alarm threshold and the CloudWatch metric. If the metric value is above the breach threshold, the upper bound is exclusive (the metric must be less than the threshold plus the upper bound). Otherwise, it is inclusive (the metric must be less than or equal to the threshold plus the upper bound). A null value indicates positive infinity.

The upper bound must be greater than the lower bound.

ScalingAdjustment -> (integer)

The amount by which to scale, based on the specified adjustment type. A positive value adds to the current capacity while a negative number removes from the current capacity.

MinAdjustmentMagnitude -> (integer)

The minimum value to scale by when scaling by percentages. For example, suppose that you create a step scaling policy to scale out an Amazon ECS service by 25 percent and you specify a MinAdjustmentMagnitude of 2. If the service has 4 tasks and the scaling policy is performed, 25 percent of 4 is 1. However, because you specified a MinAdjustmentMagnitude of 2, Application Auto Scaling scales out the service by 2 tasks.

Valid only if the adjustment type is PercentChangeInCapacity .

Cooldown -> (integer)

The amount of time, in seconds, to wait for a previous scaling activity to take effect.

With scale-out policies, the intention is to continuously (but not excessively) scale out. After Application Auto Scaling successfully scales out using a step scaling policy, it starts to calculate the cooldown time. While the cooldown period is in effect, capacity added by the initiating scale-out activity is calculated as part of the desired capacity for the next scale-out activity. For example, when an alarm triggers a step scaling policy to increase the capacity by 2, the scaling activity completes successfully, and a cooldown period starts. If the alarm triggers again during the cooldown period but at a more aggressive step adjustment of 3, the previous increase of 2 is considered part of the current capacity. Therefore, only 1 is added to the capacity.

With scale-in policies, the intention is to scale in conservatively to protect your application’s availability, so scale-in activities are blocked until the cooldown period has expired. However, if another alarm triggers a scale-out activity during the cooldown period after a scale-in activity, Application Auto Scaling scales out the target immediately. In this case, the cooldown period for the scale-in activity stops and doesn’t complete.

Application Auto Scaling provides a default value of 300 for the following scalable targets:

ECS services

Spot Fleet requests

EMR clusters

AppStream 2.0 fleets

Aurora DB clusters

Amazon SageMaker endpoint variants

Custom resources

For all other scalable targets, the default value is 0:

DynamoDB tables

DynamoDB global secondary indexes

Amazon Comprehend document classification endpoints

Lambda provisioned concurrency

Amazon Keyspaces tables

MetricAggregationType -> (string)

The aggregation type for the CloudWatch metrics. Valid values are Minimum , Maximum , and Average . If the aggregation type is null, the value is treated as Average .

TargetTrackingScalingPolicyConfiguration -> (structure)

A target tracking scaling policy.

TargetValue -> (double)

The target value for the metric. The range is 8.515920e-109 to 1.174271e+108 (Base 10) or 2e-360 to 2e360 (Base 2).

PredefinedMetricSpecification -> (structure)

A predefined metric. You can specify either a predefined metric or a customized metric.

PredefinedMetricType -> (string)

The metric type. The ALBRequestCountPerTarget metric type applies only to Spot Fleet requests and ECS services.

ResourceLabel -> (string)

Identifies the resource associated with the metric type. You can’t specify a resource label unless the metric type is ALBRequestCountPerTarget and there is a target group attached to the Spot Fleet request or ECS service.

Elastic Load Balancing sends data about your load balancers to Amazon CloudWatch. CloudWatch collects the data and specifies the format to use to access the data. The format is app/<load-balancer-name>/<load-balancer-id>/targetgroup/<target-group-name>/<target-group-id>, where:

app/<load-balancer-name>/<load-balancer-id> is the final portion of the load balancer ARN

targetgroup/<target-group-name>/<target-group-id> is the final portion of the target group ARN.

To find the ARN for an Application Load Balancer, use the DescribeLoadBalancers API operation. To find the ARN for the target group, use the DescribeTargetGroups API operation.

CustomizedMetricSpecification -> (structure)

A customized metric. You can specify either a predefined metric or a customized metric.

MetricName -> (string)

The name of the metric.

Namespace -> (string)

The namespace of the metric.

Dimensions -> (list)

The dimensions of the metric.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

(structure)

Describes the dimension names and values associated with a metric.

Name -> (string)

The name of the dimension.

Value -> (string)

The value of the dimension.

Statistic -> (string)

The statistic of the metric.

Unit -> (string)

The unit of the metric.

ScaleOutCooldown -> (integer)

The amount of time, in seconds, to wait for a previous scale-out activity to take effect.

With the scale-out cooldown period , the intention is to continuously (but not excessively) scale out. After Application Auto Scaling successfully scales out using a target tracking scaling policy, it starts to calculate the cooldown time. While the scale-out cooldown period is in effect, the capacity added by the initiating scale-out activity is calculated as part of the desired capacity for the next scale-out activity.

Application Auto Scaling provides a default value of 300 for the following scalable targets:

ECS services

Spot Fleet requests

EMR clusters

AppStream 2.0 fleets

Aurora DB clusters

Amazon SageMaker endpoint variants

Custom resources

For all other scalable targets, the default value is 0:

DynamoDB tables

DynamoDB global secondary indexes

Amazon Comprehend document classification endpoints

Lambda provisioned concurrency

Amazon Keyspaces tables

ScaleInCooldown -> (integer)

The amount of time, in seconds, after a scale-in activity completes before another scale-in activity can start.

With the scale-in cooldown period , the intention is to scale in conservatively to protect your application’s availability, so scale-in activities are blocked until the cooldown period has expired. However, if another alarm triggers a scale-out activity during the scale-in cooldown period, Application Auto Scaling scales out the target immediately. In this case, the scale-in cooldown period stops and doesn’t complete.

Application Auto Scaling provides a default value of 300 for the following scalable targets:

ECS services

Spot Fleet requests

EMR clusters

AppStream 2.0 fleets

Aurora DB clusters

Amazon SageMaker endpoint variants

Custom resources

For all other scalable targets, the default value is 0:

DynamoDB tables

DynamoDB global secondary indexes

Amazon Comprehend document classification endpoints

Lambda provisioned concurrency

Amazon Keyspaces tables

DisableScaleIn -> (boolean)

Indicates whether scale in by the target tracking scaling policy is disabled. If the value is true , scale in is disabled and the target tracking scaling policy won’t remove capacity from the scalable target. Otherwise, scale in is enabled and the target tracking scaling policy can remove capacity from the scalable target. The default value is false .

Alarms -> (list)

The CloudWatch alarms associated with the scaling policy.

(structure)

Represents a CloudWatch alarm associated with a scaling policy.

AlarmName -> (string)

The name of the alarm.

AlarmARN -> (string)

The Amazon Resource Name (ARN) of the alarm.

CreationTime -> (timestamp)

The Unix timestamp for when the scaling policy was created.

NextToken -> (string)

The token required to get the next set of results. This value is null if there are no more results to return.

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