DescribeScalingActivities - Amazon EC2 Auto Scaling


Describes one or more scaling activities for the specified Auto Scaling group.

To view the scaling activities from the Amazon EC2 Auto Scaling console, choose the Activity tab of the Auto Scaling group. When scaling events occur, you see scaling activity messages in the Activity history. For more information, see Verifying a scaling activity for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide.

Request Parameters

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


The activity IDs of the desired scaling activities. You can specify up to 50 IDs. If you omit this parameter, all activities for the past six weeks are described. If unknown activities are requested, they are ignored with no error. If you specify an Auto Scaling group, the results are limited to that group.

Type: Array of strings

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No


The name of the Auto Scaling group.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No


Indicates whether to include scaling activity from deleted Auto Scaling groups.

Type: Boolean

Required: No


The maximum number of items to return with this call. The default value is 100 and the maximum value is 100.

Type: Integer

Required: No


The token for the next set of items to return. (You received this token from a previous call.)

Type: String

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: No

Response Elements

The following elements are returned by the service.


The scaling activities. Activities are sorted by start time. Activities still in progress are described first.

Type: Array of Activity objects


A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

Type: String

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*


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


The NextToken value is not valid.

HTTP Status Code: 400


You already have a pending update to an Amazon EC2 Auto Scaling resource (for example, an Auto Scaling group, instance, or load balancer).

HTTP Status Code: 500



This example illustrates one usage of DescribeScalingActivities.

Sample Request &AutoScalingGroupName=my-asg &Version=2011-01-01 &AUTHPARAMS

Sample Response

<DescribeScalingActivitiesResponse xmlns=""> <DescribeScalingActivitiesResult> <Activities> <member> <StatusCode>Failed</StatusCode> <Progress>0</Progress> <ActivityId>12345678-1234-1234-1234-123456789012</ActivityId> <StartTime>2019-04-12T17:32:07.882Z</StartTime> <AutoScalingGroupName>my-asg</AutoScalingGroupName> <AutoScalingGroupARN>arn:aws:autoscaling:us-east-1:123456789012:autoScalingGroup:12345678-1234-1234-1234-123456789012:autoScalingGroupName/my-asg</AutoScalingGroupARN> <Cause>At 2019-04-12T17:31:30Z a user request created an AutoScalingGroup changing the desired capacity from 0 to 1. At 2019-04-12T17:32:07Z an instance was started in response to a difference between desired and actual capacity, increasing the capacity from 0 to 1.</Cause> <Details>{}</Details> <Description>Launching a new EC2 instance. Status Reason: The image id 'ami-4edb0327' does not exist. Launching EC2 instance failed.</Description> <EndTime>2019-04-12T17:32:08Z</EndTime> <StatusMessage>The image id 'ami-4edb0327' does not exist. Launching EC2 instance failed.</StatusMessage> </member> </Activities> </DescribeScalingActivitiesResult> <ResponseMetadata> <RequestId>7c6e177f-f082-11e1-ac58-3714bEXAMPLE</RequestId> </ResponseMetadata> </DescribeScalingActivitiesResponse>

See Also

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