CreateLoadBalancer与 AWS SDK 或 CLI 配合使用

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以下代码示例演示如何使用 CreateLoadBalancer。

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

.NET

AWS SDK for .NET

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

    /// <summary>
    /// Create an Elastic Load Balancing load balancer that uses the specified subnets
    /// and forwards requests to the specified target group.
    /// </summary>
    /// <param name="name">The name for the new load balancer.</param>
    /// <param name="subnetIds">Subnets for the load balancer.</param>
    /// <param name="targetGroup">Target group for forwarded requests.</param>
    /// <returns>The new LoadBalancer object.</returns>
    public async Task<LoadBalancer> CreateLoadBalancerAndListener(string name, List<string> subnetIds, TargetGroup targetGroup)
    {
        var createLbResponse = await _amazonElasticLoadBalancingV2.CreateLoadBalancerAsync(
            new CreateLoadBalancerRequest()
            {
                Name = name,
                Subnets = subnetIds
            });
        var loadBalancerArn = createLbResponse.LoadBalancers[0].LoadBalancerArn;

        // Wait for load balancer to be available.
        var loadBalancerReady = false;
        while (!loadBalancerReady)
        {
            try
            {
                var describeResponse =
                    await _amazonElasticLoadBalancingV2.DescribeLoadBalancersAsync(
                        new DescribeLoadBalancersRequest()
                        {
                            Names = new List<string>() { name }
                        });

                var loadBalancerState = describeResponse.LoadBalancers[0].State.Code;

                loadBalancerReady = loadBalancerState == LoadBalancerStateEnum.Active;
            }
            catch (LoadBalancerNotFoundException)
            {
                loadBalancerReady = false;
            }
            Thread.Sleep(10000);
        }
        // Create the listener.
        await _amazonElasticLoadBalancingV2.CreateListenerAsync(
            new CreateListenerRequest()
            {
                LoadBalancerArn = loadBalancerArn,
                Protocol = targetGroup.Protocol,
                Port = targetGroup.Port,
                DefaultActions = new List<Action>()
                {
                    new Action()
                    {
                        Type = ActionTypeEnum.Forward,
                        TargetGroupArn = targetGroup.TargetGroupArn
                    }
                }
            });
        return createLbResponse.LoadBalancers[0];
    }

• 有关 API 的详细信息，请参阅 AWS SDK for .NET API 参考CreateLoadBalancer中的。

CLI

AWS CLI

示例 1：创建面向 Internet 的负载均衡器

以下 create-load-balancer 示例创建一个面向 Internet 的应用程序负载均衡器，并为指定的子网启用可用区。

aws elbv2 create-load-balancer \
    --name my-load-balancer \
    --subnets subnet-b7d581c0 subnet-8360a9e7

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": "2017-08-25T21:26:12.920Z",
            "CanonicalHostedZoneId": "Z2P70J7EXAMPLE",
            "DNSName": "my-load-balancer-424835706.us-west-2.elb.amazonaws.com",
            "SecurityGroups": [
                "sg-5943793c"
            ],
            "LoadBalancerName": "my-load-balancer",
            "State": {
                "Code": "provisioning"
            },
            "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188"
        }
    ]
}

有关更多信息，请参阅《应用程序负载均衡器用户指南》中的教程：使用 AWS CLI 创建应用程序负载均衡器。

示例 2：创建内部负载均衡器

以下 create-load-balancer 示例创建一个内部应用程序负载均衡器，并为指定的子网启用可用区。

aws elbv2 create-load-balancer \
    --name my-internal-load-balancer \
    --scheme internal \
    --subnets subnet-b7d581c0 subnet-8360a9e7

输出：

{
    "LoadBalancers": [
        {
            "Type": "application",
            "Scheme": "internal",
            "IpAddressType": "ipv4",
            "VpcId": "vpc-3ac0fb5f",
            "AvailabilityZones": [
                {
                    "ZoneName": "us-west-2a",
                    "SubnetId": "subnet-8360a9e7"
                },
                {
                    "ZoneName": "us-west-2b",
                    "SubnetId": "subnet-b7d581c0"
                }
            ],
            "CreatedTime": "2016-03-25T21:29:48.850Z",
            "CanonicalHostedZoneId": "Z2P70J7EXAMPLE",
            "DNSName": "internal-my-internal-load-balancer-1529930873.us-west-2.elb.amazonaws.com",
            "SecurityGroups": [
                "sg-5943793c"
            ],
            "LoadBalancerName": "my-internal-load-balancer",
            "State": {
                "Code": "provisioning"
            },
            "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-internal-load-balancer/5b49b8d4303115c2"
        }
    ]
}

有关更多信息，请参阅《应用程序负载均衡器用户指南》中的教程：使用 AWS CLI 创建应用程序负载均衡器。

示例 3：创建网络负载均衡器

以下 create-load-balancer 示例创建一个面向 Internet 的网络负载均衡器，并为指定的子网启用可用区。它使用子网映射，将指定的弹性 IP 地址与可用区的负载均衡器节点使用的网络接口相关联。

aws elbv2 create-load-balancer \
    --name my-network-load-balancer \
    --type network \
    --subnet-mappings SubnetId=subnet-b7d581c0,AllocationId=eipalloc-64d5890a

输出：

{
    "LoadBalancers": [
        {
            "Type": "network",
            "Scheme": "internet-facing",
            "IpAddressType": "ipv4",
            "VpcId": "vpc-3ac0fb5f",
            "AvailabilityZones": [
                {
                    "LoadBalancerAddresses": [
                        {
                            "IpAddress": "35.161.207.171",
                            "AllocationId": "eipalloc-64d5890a"
                        }
                    ],
                    "ZoneName": "us-west-2b",
                    "SubnetId": "subnet-5264e837"
                }
            ],
            "CreatedTime": "2017-10-15T22:41:25.657Z",
            "CanonicalHostedZoneId": "Z2P70J7EXAMPLE",
            "DNSName": "my-network-load-balancer-5d1b75f4f1cee11e.elb.us-west-2.amazonaws.com",
            "LoadBalancerName": "my-network-load-balancer",
            "State": {
                "Code": "provisioning"
            },
            "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/net/my-network-load-balancer/5d1b75f4f1cee11e"
        }
    ]
}

有关更多信息，请参阅网络负载均衡器用户指南中的教程：使用 AWS CLI 创建网络负载均衡器。

示例 4：创建网关负载均衡器

以下 create-load-balancer 示例创建一个网关负载均衡器，并为指定的子网启用可用区。

aws elbv2 create-load-balancer \
    --name my-gateway-load-balancer \
    --type gateway \
    --subnets subnet-dc83f691 subnet-a62583f9

输出：

{
    "LoadBalancers": [
        {
            "Type": "gateway",
            "VpcId": "vpc-838475fe",
            "AvailabilityZones": [
                {
                    "ZoneName": "us-east-1b",
                    "SubnetId": "subnet-a62583f9"
                },
            {
                    "ZoneName": "us-east-1a",
                    "SubnetId": "subnet-dc83f691"
                }
            ],
            "CreatedTime": "2021-07-14T19:33:43.324000+00:00",
            "LoadBalancerName": "my-gateway-load-balancer",
            "State": {
                "Code": "provisioning"
            },
            "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-east-1:850631746142:loadbalancer/gwy/my-gateway-load-balancer/dfbb5a7d32cdee79"
        }
    ]
}

有关更多信息，请参阅网关负载均衡器用户指南中的使用 AWS CLI 使用网关负载均衡器入门。

• 有关 API 的详细信息，请参阅AWS CLI 命令参考CreateLoadBalancer中的。

Java

适用于 Java 的 SDK 2.x

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

    /*
     * Creates an Elastic Load Balancing load balancer that uses the specified
     * subnets
     * and forwards requests to the specified target group.
     */
    public String createLoadBalancer(List<Subnet> subnetIds, String targetGroupARN, String lbName, int port,
            String protocol) {
        try {
            List<String> subnetIdStrings = subnetIds.stream()
                    .map(Subnet::subnetId)
                    .collect(Collectors.toList());

            CreateLoadBalancerRequest balancerRequest = CreateLoadBalancerRequest.builder()
                    .subnets(subnetIdStrings)
                    .name(lbName)
                    .scheme("internet-facing")
                    .build();

            // Create and wait for the load balancer to become available.
            CreateLoadBalancerResponse lsResponse = getLoadBalancerClient().createLoadBalancer(balancerRequest);
            String lbARN = lsResponse.loadBalancers().get(0).loadBalancerArn();

            ElasticLoadBalancingV2Waiter loadBalancerWaiter = getLoadBalancerClient().waiter();
            DescribeLoadBalancersRequest request = DescribeLoadBalancersRequest.builder()
                    .loadBalancerArns(lbARN)
                    .build();

            System.out.println("Waiting for Load Balancer " + lbName + " to become available.");
            WaiterResponse<DescribeLoadBalancersResponse> waiterResponse = loadBalancerWaiter
                    .waitUntilLoadBalancerAvailable(request);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println("Load Balancer " + lbName + " is available.");

            // Get the DNS name (endpoint) of the load balancer.
            String lbDNSName = lsResponse.loadBalancers().get(0).dnsName();
            System.out.println("*** Load Balancer DNS Name: " + lbDNSName);

            // Create a listener for the load balance.
            Action action = Action.builder()
                    .targetGroupArn(targetGroupARN)
                    .type("forward")
                    .build();

            CreateListenerRequest listenerRequest = CreateListenerRequest.builder()
                    .loadBalancerArn(lsResponse.loadBalancers().get(0).loadBalancerArn())
                    .defaultActions(action)
                    .port(port)
                    .protocol(protocol)
                    .defaultActions(action)
                    .build();

            getLoadBalancerClient().createListener(listenerRequest);
            System.out.println("Created listener to forward traffic from load balancer " + lbName + " to target group "
                    + targetGroupARN);

            // Return the load balancer DNS name.
            return lbDNSName;

        } catch (ElasticLoadBalancingV2Exception e) {
            e.printStackTrace();
        }
        return "";
    }

• 有关 API 的详细信息，请参阅 AWS SDK for Java 2.x API 参考CreateLoadBalancer中的。

JavaScript

适用于 JavaScript (v3) 的软件开发工具包

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

    const client = new ElasticLoadBalancingV2Client({});
    const { LoadBalancers } = await client.send(
      new CreateLoadBalancerCommand({
        Name: NAMES.loadBalancerName,
        Subnets: state.subnets,
      }),
    );
    state.loadBalancerDns = LoadBalancers[0].DNSName;
    state.loadBalancerArn = LoadBalancers[0].LoadBalancerArn;
    await waitUntilLoadBalancerAvailable(
      { client },
      { Names: [NAMES.loadBalancerName] },
    );

• 有关 API 的详细信息，请参阅 AWS SDK for JavaScript API 参考CreateLoadBalancer中的。

PowerShell

用于 PowerShell

示例 1：此示例创建了具有两个子网的面向互联网的新应用程序负载均衡器。

New-ELB2LoadBalancer -Type application -Scheme internet-facing -IpAddressType ipv4 -Name 'New-Test-ALB' -SecurityGroup 'sg-07c3414abb8811cbd' -subnet 'subnet-c37a67a6','subnet-fc02eea0'

输出：

AvailabilityZones     : {us-east-1b, us-east-1a}
CanonicalHostedZoneId : Z35SXDOTRQ7X7K
CreatedTime           : 12/28/19 2:58:03 PM
DNSName               : New-Test-ALB-1391502222.us-east-1.elb.amazonaws.com
IpAddressType         : ipv4
LoadBalancerArn       : arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/New-Test-ALB/dab2e4d90eb51493
LoadBalancerName      : New-Test-ALB
Scheme                : internet-facing
SecurityGroups        : {sg-07c3414abb8811cbd}
State                 : Amazon.ElasticLoadBalancingV2.Model.LoadBalancerState
Type                  : application
VpcId                 : vpc-2cfd7000

• 有关 API 的详细信息，请参阅 AWS Tools for PowerShell Cmdlet 参考CreateLoadBalancer中的。

Python

适用于 Python 的 SDK（Boto3）

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

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 create_load_balancer(
        self,
        load_balancer_name: str,
        subnet_ids: List[str],
    ) -> Dict[str, Any]:
        """
        Creates an Elastic Load Balancing load balancer that uses the specified subnets
        and forwards requests to the specified target group.

        :param load_balancer_name: The name of the load balancer to create.
        :param subnet_ids: A list of subnets to associate with the load balancer.
        :return: Data about the newly created load balancer.
        """
        try:
            response = self.elb_client.create_load_balancer(
                Name=load_balancer_name, Subnets=subnet_ids
            )
            load_balancer = response["LoadBalancers"][0]
            log.info(f"Created load balancer '{load_balancer_name}'.")

            waiter = self.elb_client.get_waiter("load_balancer_available")
            log.info(
                f"Waiting for load balancer '{load_balancer_name}' to be available..."
            )
            waiter.wait(Names=[load_balancer_name])
            log.info(f"Load balancer '{load_balancer_name}' is now available!")

        except ClientError as err:
            error_code = err.response["Error"]["Code"]
            log.error(
                f"Failed to create load balancer '{load_balancer_name}'. Error code: {error_code}, Message: {err.response['Error']['Message']}"
            )

            if error_code == "DuplicateLoadBalancerNameException":
                log.error(
                    f"A load balancer with the name '{load_balancer_name}' already exists. "
                    "Load balancer names must be unique within the AWS region. "
                    "Please choose a different name and try again."
                )
            if error_code == "TooManyLoadBalancersException":
                log.error(
                    "The maximum number of load balancers has been reached in this account and region. "
                    "You can delete unused load balancers or request an increase in the service quota from AWS Support."
                )
            log.error(f"Full error:\n\t{err}")
        else:
            return load_balancer

• 有关 API 的详细信息，请参阅适用CreateLoadBalancer于 Python 的AWS SDK (Boto3) API 参考。