CreateAutoScalingConfiguration - AWS App Runner


Create an AWS App Runner automatic scaling configuration resource. App Runner requires this resource when you create or update App Runner services and you require non-default auto scaling settings. You can share an auto scaling configuration across multiple services.

Create multiple revisions of a configuration by calling this action multiple times using the same AutoScalingConfigurationName. The call returns incremental AutoScalingConfigurationRevision values. When you create a service and configure an auto scaling configuration resource, the service uses the latest active revision of the auto scaling configuration by default. You can optionally configure the service to use a specific revision.

Configure a higher MinSize to increase the spread of your App Runner service over more Availability Zones in the AWS Region. The tradeoff is a higher minimal cost.

Configure a lower MaxSize to control your cost. The tradeoff is lower responsiveness during peak demand.

Request Syntax

{ "AutoScalingConfigurationName": "string", "MaxConcurrency": number, "MaxSize": number, "MinSize": number, "Tags": [ { "Key": "string", "Value": "string" } ] }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


A name for the auto scaling configuration. When you use it for the first time in an AWS Region, App Runner creates revision number 1 of this name. When you use the same name in subsequent calls, App Runner creates incremental revisions of the configuration.


Prior to the release of Auto scale configuration enhancements, the name DefaultConfiguration was reserved.

This restriction is no longer in place. You can now manage DefaultConfiguration the same way you manage your custom auto scaling configurations. This means you can do the following with the DefaultConfiguration that App Runner provides:

  • Create new revisions of the DefaultConfiguration.

  • Delete the revisions of the DefaultConfiguration.

  • Delete the auto scaling configuration for which the App Runner DefaultConfiguration was created.

  • If you delete the auto scaling configuration you can create another custom auto scaling configuration with the same DefaultConfiguration name. The original DefaultConfiguration resource provided by App Runner remains in your account unless you make changes to it.

Type: String

Length Constraints: Minimum length of 4. Maximum length of 32.

Pattern: [A-Za-z0-9][A-Za-z0-9\-_]{3,31}

Required: Yes


The maximum number of concurrent requests that you want an instance to process. If the number of concurrent requests exceeds this limit, App Runner scales up your service.

Default: 100

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 200.

Required: No


The maximum number of instances that your service scales up to. At most MaxSize instances actively serve traffic for your service.

Default: 25

Type: Integer

Valid Range: Minimum value of 1.

Required: No


The minimum number of instances that App Runner provisions for your service. The service always has at least MinSize provisioned instances. Some of them actively serve traffic. The rest of them (provisioned and inactive instances) are a cost-effective compute capacity reserve and are ready to be quickly activated. You pay for memory usage of all the provisioned instances. You pay for CPU usage of only the active subset.

App Runner temporarily doubles the number of provisioned instances during deployments, to maintain the same capacity for both old and new code.

Default: 1

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 25.

Required: No


A list of metadata items that you can associate with your auto scaling configuration resource. A tag is a key-value pair.

Type: Array of Tag objects

Required: No

Response Syntax

{ "AutoScalingConfiguration": { "AutoScalingConfigurationArn": "string", "AutoScalingConfigurationName": "string", "AutoScalingConfigurationRevision": number, "CreatedAt": number, "DeletedAt": number, "HasAssociatedService": boolean, "IsDefault": boolean, "Latest": boolean, "MaxConcurrency": number, "MaxSize": number, "MinSize": number, "Status": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


A description of the App Runner auto scaling configuration that's created by this request.

Type: AutoScalingConfiguration object


For information about the errors that are common to all actions, see Common Errors.


An unexpected service exception occurred.

HTTP Status Code: 500


One or more input parameters aren't valid. Refer to the API action's document page, correct the input parameters, and try the action again.

HTTP Status Code: 400


App Runner can't create this resource. You've reached your account quota for this resource type.

For App Runner per-resource quotas, see AWS App Runner endpoints and quotas in the AWS General Reference.

HTTP Status Code: 400


Create a high availability auto scaling configuration

This example illustrates how to create an auto scaling configuration optimized for high availability by setting MinSize to 5. With this configuration, App Runner attempts to spread your service instances over the most Availability Zones possible, up to five, depending on the AWS Region.

The call returns an AutoScalingConfiguration object with the other settings set to their defaults. In the example, this is the first call to create a configuration named high-availability. The revision is set to 1, and it's the latest revision.

Sample Request

$ aws apprunner create-auto-scaling-configuration --cli-input-json "`cat`" { "AutoScalingConfigurationName": "high-availability", "MinSize": 5 }

Sample Response

{ "AutoScalingConfiguration": { "AutoScalingConfigurationArn": "arn:aws:apprunner:us-east-1:123456789012:autoscalingconfiguration/high-availability/1/2f50e7656d7819fead0f59672e68042e", "AutoScalingConfigurationName": "high-availability", "AutoScalingConfigurationRevision": 1, "CreatedAt": "2020-11-03T00:29:17Z", "Latest": true, "Status": "ACTIVE", "MaxConcurrency": 100, "MaxSize": 25, "MinSize": 5 } }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: