# DescribeLoadBalancers
<a name="API_DescribeLoadBalancers"></a>

**Note**  
This API operation is superseded by [DescribeTrafficSources](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeTrafficSources.html), which can describe multiple traffic sources types. We recommend using `DescribeTrafficSources` to simplify how you manage traffic sources. However, we continue to support `DescribeLoadBalancers`. You can use both the original `DescribeLoadBalancers` API operation and `DescribeTrafficSources` on the same Auto Scaling group.

Gets information about the load balancers for the specified Auto Scaling group.

This operation describes only Classic Load Balancers. If you have Application Load Balancers, Network Load Balancers, or Gateway Load Balancers, use the [DescribeLoadBalancerTargetGroups](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeLoadBalancerTargetGroups.html) API instead.

To determine the attachment status of the load balancer, use the `State` element in the response. When you attach a load balancer 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 load balancer. 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 load balancer 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 load balancer doesn't enter the `InService` state. 

Load balancers also have an `InService` state if you attach them in the [CreateAutoScalingGroup](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_CreateAutoScalingGroup.html) API call. If your load balancer state is `InService`, but it is not working properly, check the scaling activities by calling [DescribeScalingActivities](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_DescribeScalingActivities.html) and take any corrective actions necessary.

For help with failed health checks, see [Troubleshooting Amazon EC2 Auto Scaling: Health checks](https://docs.aws.amazon.com/autoscaling/ec2/userguide/ts-as-healthchecks.html) 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](https://docs.aws.amazon.com/autoscaling/ec2/userguide/autoscaling-load-balancer.html) in the *Amazon EC2 Auto Scaling User Guide*. 

## Request Parameters
<a name="API_DescribeLoadBalancers_RequestParameters"></a>

 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** AutoScalingGroupName **   
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

 ** MaxRecords **   
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

 ** NextToken **   
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
<a name="API_DescribeLoadBalancers_ResponseElements"></a>

The following elements are returned by the service.

 **LoadBalancers.member.N**   
The load balancers.  
Type: Array of [LoadBalancerState](API_LoadBalancerState.md) objects

 ** NextToken **   
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]*` 

## Errors
<a name="API_DescribeLoadBalancers_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** InvalidNextToken **   
The `NextToken` value is not valid.    
 ** message **   

HTTP Status Code: 400

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

HTTP Status Code: 500

## Examples
<a name="API_DescribeLoadBalancers_Examples"></a>

### Example
<a name="API_DescribeLoadBalancers_Example_1"></a>

This example illustrates one usage of DescribeLoadBalancers.

#### Sample Request
<a name="API_DescribeLoadBalancers_Example_1_Request"></a>

```
https://autoscaling.amazonaws.com/?Action=DescribeLoadBalancers
&AutoScalingGroupName=my-asg
&Version=2011-01-01
&AUTHPARAMS
```

#### Sample Response
<a name="API_DescribeLoadBalancers_Example_1_Response"></a>

```
<DescribeLoadBalancersResponse xmlns="https://autoscaling.amazonaws.com/doc/2011-01-01/">
  <DescribeLoadBalancersResult>
    <LoadBalancers>
      <member>
        <LoadBalancerName>my-loadbalancer</LoadBalancerName>
        <State>Added</State>
      </member>
    </LoadBalancers>
  </DescribeLoadBalancersResult>
  <ResponseMetadata>
    <RequestId>7c6e177f-f082-11e1-ac58-3714bEXAMPLE</RequestId>
  </ResponseMetadata>
</DescribeLoadBalancersResponse>
```

## See Also
<a name="API_DescribeLoadBalancers_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/autoscaling-2011-01-01/DescribeLoadBalancers) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/autoscaling-2011-01-01/DescribeLoadBalancers)