AutoScaling / Client / describe_load_balancer_target_groups

describe_load_balancer_target_groups#

AutoScaling.Client.describe_load_balancer_target_groups(**kwargs)#

Note

This API operation is superseded by DescribeTrafficSources, which can describe multiple traffic sources types. We recommend using DetachTrafficSources to simplify how you manage traffic sources. However, we continue to support DescribeLoadBalancerTargetGroups. You can use both the original DescribeLoadBalancerTargetGroups API operation and DescribeTrafficSources on the same Auto Scaling group.

Gets information about the Elastic Load Balancing target groups for the specified Auto Scaling group.

To determine the attachment status of the target group, use the State element in the response. When you attach a target group to an Auto Scaling group, the initial State value is Adding. The state transitions to Added after all Auto Scaling instances are registered with the target group. If Elastic Load Balancing health checks are enabled for the Auto Scaling group, the state transitions to InService after at least one Auto Scaling instance passes the health check. When the target group is in the InService state, Amazon EC2 Auto Scaling can terminate and replace any instances that are reported as unhealthy. If no registered instances pass the health checks, the target group doesn’t enter the InService state.

Target groups also have an InService state if you attach them in the CreateAutoScalingGroup API call. If your target group state is InService, but it is not working properly, check the scaling activities by calling DescribeScalingActivities and take any corrective actions necessary.

For help with failed health checks, see Troubleshooting Amazon EC2 Auto Scaling: Health checks in the Amazon EC2 Auto Scaling User Guide. For more information, see Use Elastic Load Balancing to distribute traffic across the instances in your Auto Scaling group in the Amazon EC2 Auto Scaling User Guide.

Note

You can use this operation to describe target groups that were attached by using AttachLoadBalancerTargetGroups, but not for target groups that were attached by using AttachTrafficSources.

See also: AWS API Documentation

Request Syntax

response = client.describe_load_balancer_target_groups(
    AutoScalingGroupName='string',
    NextToken='string',
    MaxRecords=123
)
Parameters:

  • AutoScalingGroupName (string) –

    [REQUIRED]

    The name of the Auto Scaling group.

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

  • MaxRecords (integer) – The maximum number of items to return with this call. The default value is 100 and the maximum value is 100.

Return type:

dict

Returns:

Response Syntax

{
    'LoadBalancerTargetGroups': [
        {
            'LoadBalancerTargetGroupARN': 'string',
            'State': 'string'
        },
    ],
    'NextToken': 'string'
}

Response Structure

  • (dict) –

    • LoadBalancerTargetGroups (list) –

      Information about the target groups.

      • (dict) –

        Describes the state of a target group.

        • LoadBalancerTargetGroupARN (string) –

          The Amazon Resource Name (ARN) of the target group.

        • State (string) –

          The state of the target group.

          • Adding - The Auto Scaling instances are being registered with the target group.

          • Added - All Auto Scaling instances are registered with the target group.

          • InService - At least one Auto Scaling instance passed an ELB health check.

          • Removing - The Auto Scaling instances are being deregistered from the target group. If connection draining is enabled, Elastic Load Balancing waits for in-flight requests to complete before deregistering the instances.

          • Removed - All Auto Scaling instances are deregistered from the target group.

    • NextToken (string) –

      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.

Exceptions

  • AutoScaling.Client.exceptions.ResourceContentionFault

  • AutoScaling.Client.exceptions.InvalidNextToken

Examples

This example describes the target groups attached to the specified Auto Scaling group.

response = client.describe_load_balancer_target_groups(
    AutoScalingGroupName='my-auto-scaling-group',
)

print(response)

Expected Output:

{
    'LoadBalancerTargetGroups': [
        {
            'LoadBalancerTargetGroupARN': 'arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-targets/73e2d6bc24d8a067',
            'State': 'Added',
        },
    ],
    'ResponseMetadata': {
        '...': '...',
    },
}