AttachTrafficSources - Amazon EC2 Auto Scaling


Attaches one or more traffic sources to the specified Auto Scaling group.

You can use any of the following as traffic sources for an Auto Scaling group:

  • Application Load Balancer

  • Classic Load Balancer

  • Gateway Load Balancer

  • Network Load Balancer

  • VPC Lattice

This operation is additive and does not detach existing traffic sources from the Auto Scaling group.

After the operation completes, use the DescribeTrafficSources API to return details about the state of the attachments between traffic sources and your Auto Scaling group. To detach a traffic source from the Auto Scaling group, call the DetachTrafficSources API.

Request Parameters

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


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: Yes


The unique identifiers of one or more traffic sources. You can specify up to 10 traffic sources.

Type: Array of TrafficSourceIdentifier objects

Required: Yes


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


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


The service-linked role is not yet ready for use.

HTTP Status Code: 500



This example attaches two VPC Lattice target groups, as specified by their ARNs, to the Auto Scaling group named my-asg.

Sample Request &AutoScalingGroupName=my-asg &TrafficSources.member.1.Identifier=arn:aws:vpc-lattice:us-west-2:123456789012:targetgroup/tg-0e2f2665eEXAMPLE &TrafficSources.member.2.Identifier=arn:aws:vpc-lattice:us-west-2:123456789012:targetgroup/tg-8360a9e72EXAMPLE &Version=2011-01-01 &AUTHPARAMS

See Also

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