文档 AWS SDK 示例 GitHub 存储库中还有更多 [S AWS DK 示例](https://github.com/awsdocs/aws-doc-sdk-examples)。
本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。
# `DescribeLoadBalancers`与 AWS SDK 或 CLI 配合使用
以下代码示例演示如何使用 `DescribeLoadBalancers`。
操作示例是大型程序的代码摘录，必须在上下文中运行。在以下代码示例中，您可以查看此操作的上下文：
+ [构建和管理弹性服务](elastic-load-balancing-v2_example_cross_ResilientService_section.md)
------
#### [ .NET ]
**适用于 .NET 的 SDK**
还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv3/cross-service/ResilientService/ElasticLoadBalancerActions#code-examples)中查找完整示例，了解如何进行设置和运行。
```
///
/// Get the HTTP Endpoint of a load balancer by its name.
///
/// The name of the load balancer.
/// The HTTP endpoint.
public async Task GetEndpointForLoadBalancerByName(string loadBalancerName)
{
if (_endpoint == null)
{
var endpointResponse =
await _amazonElasticLoadBalancingV2.DescribeLoadBalancersAsync(
new DescribeLoadBalancersRequest()
{
Names = new List() { loadBalancerName }
});
_endpoint = endpointResponse.LoadBalancers[0].DNSName;
}
return _endpoint;
}
```
+ 有关 API 的详细信息，请参阅 *适用于 .NET 的 AWS SDK API 参考[DescribeLoadBalancers](https://docs.aws.amazon.com/goto/DotNetSDKV3/elasticloadbalancingv2-2015-12-01/DescribeLoadBalancers)*中的。
------
#### [ CLI ]
**AWS CLI**
**描述负载均衡器**
此示例描述指定的负载均衡器。
命令:
```
aws elbv2 describe-load-balancers --load-balancer-arns arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188
```
输出：
```
{
"LoadBalancers": [
{
"Type": "application",
"Scheme": "internet-facing",
"IpAddressType": "ipv4",
"VpcId": "vpc-3ac0fb5f",
"AvailabilityZones": [
{
"ZoneName": "us-west-2a",
"SubnetId": "subnet-8360a9e7"
},
{
"ZoneName": "us-west-2b",
"SubnetId": "subnet-b7d581c0"
}
],
"CreatedTime": "2016-03-25T21:26:12.920Z",
"CanonicalHostedZoneId": "Z2P70J7EXAMPLE",
"DNSName": "my-load-balancer-424835706.us-west-2.elb.amazonaws.com",
"SecurityGroups": [
"sg-5943793c"
],
"LoadBalancerName": "my-load-balancer",
"State": {
"Code": "active"
},
"LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188"
}
]
}
```
**描述所有负载均衡器**
此示例描述您的所有负载均衡器。
命令:
```
aws elbv2 describe-load-balancers
```
+ 有关 API 的详细信息，请参阅*AWS CLI 命令参考[DescribeLoadBalancers](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/elbv2/describe-load-balancers.html)*中的。
------
#### [ JavaScript ]
**适用于 JavaScript (v3) 的软件开发工具包**
还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/elastic-load-balancing-v2#code-examples)中查找完整示例，了解如何进行设置和运行。
```
import {
ElasticLoadBalancingV2Client,
DescribeLoadBalancersCommand,
} from "@aws-sdk/client-elastic-load-balancing-v2";
export async function main() {
const client = new ElasticLoadBalancingV2Client({});
const { LoadBalancers } = await client.send(
new DescribeLoadBalancersCommand({}),
);
const loadBalancersList = LoadBalancers.map(
(lb) => `• ${lb.LoadBalancerName}: ${lb.DNSName}`,
).join("\n");
console.log(
"Hello, Elastic Load Balancing! Let's list some of your load balancers:\n",
loadBalancersList,
);
}
// Call function if run directly
import { fileURLToPath } from "node:url";
if (process.argv[1] === fileURLToPath(import.meta.url)) {
main();
}
```
+ 有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[DescribeLoadBalancers](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/elastic-load-balancing-v2/command/DescribeLoadBalancersCommand)*中的。
------
#### [ PowerShell ]
**适用于 PowerShell V4 的工具**
**示例 1：此示例显示给定区域的所有负载均衡器。**
```
Get-ELB2LoadBalancer
```
**输出**：
```
AvailabilityZones : {us-east-1c}
CanonicalHostedZoneId : Z26RNL4JYFTOTI
CreatedTime : 6/22/18 11:21:50 AM
DNSName : test-elb1234567890-238d34ad8d94bc2e.elb.us-east-1.amazonaws.com
IpAddressType : ipv4
LoadBalancerArn : arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/net/test-elb1234567890/238d34ad8d94bc2e
LoadBalancerName : test-elb1234567890
Scheme : internet-facing
SecurityGroups : {}
State : Amazon.ElasticLoadBalancingV2.Model.LoadBalancerState
Type : network
VpcId : vpc-2cf00000
```
+ 有关 API 的详细信息，请参阅 *AWS Tools for PowerShell Cmdlet 参考 (V* 4) [DescribeLoadBalancers](https://docs.aws.amazon.com/powershell/v4/reference)中的。
**适用于 PowerShell V5 的工具**
**示例 1：此示例显示给定区域的所有负载均衡器。**
```
Get-ELB2LoadBalancer
```
**输出**：
```
AvailabilityZones : {us-east-1c}
CanonicalHostedZoneId : Z26RNL4JYFTOTI
CreatedTime : 6/22/18 11:21:50 AM
DNSName : test-elb1234567890-238d34ad8d94bc2e.elb.us-east-1.amazonaws.com
IpAddressType : ipv4
LoadBalancerArn : arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/net/test-elb1234567890/238d34ad8d94bc2e
LoadBalancerName : test-elb1234567890
Scheme : internet-facing
SecurityGroups : {}
State : Amazon.ElasticLoadBalancingV2.Model.LoadBalancerState
Type : network
VpcId : vpc-2cf00000
```
+ 有关 API 的详细信息，请参阅 *AWS Tools for PowerShell Cmdlet 参考 (V* 5) [DescribeLoadBalancers](https://docs.aws.amazon.com/powershell/v5/reference)中的。
------
#### [ Python ]
**适用于 Python 的 SDK（Boto3）**
还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/elastic-load-balancing#code-examples)中查找完整示例，了解如何进行设置和运行。
```
class ElasticLoadBalancerWrapper:
"""Encapsulates Elastic Load Balancing (ELB) actions."""
def __init__(self, elb_client: boto3.client):
"""
Initializes the LoadBalancer class with the necessary parameters.
"""
self.elb_client = elb_client
def get_endpoint(self, load_balancer_name) -> str:
"""
Gets the HTTP endpoint of the load balancer.
:return: The endpoint.
"""
try:
response = self.elb_client.describe_load_balancers(
Names=[load_balancer_name]
)
return response["LoadBalancers"][0]["DNSName"]
except ClientError as err:
log.error(
f"Couldn't get the endpoint for load balancer {load_balancer_name}"
)
error_code = err.response["Error"]["Code"]
if error_code == "LoadBalancerNotFoundException":
log.error(
"Verify load balancer name and ensure it exists in the AWS console."
)
log.error(f"Full error:\n\t{err}")
```
+ 有关 API 的详细信息，请参阅适用[DescribeLoadBalancers](https://docs.aws.amazon.com/goto/boto3/elasticloadbalancingv2-2015-12-01/DescribeLoadBalancers)于 *Python 的AWS SDK (Boto3) API 参考*。
------