Utilizzare CreateLoadBalancer con un SDK AWS o una CLI

    /// <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];
    }

Esempio 1: come creare un bilanciatore del carico con connessione a Internet.

L’esempio create-load-balancer seguente crea un Application Load Balancer con connessione a Internet e abilita le zone di disponibilità per le sottoreti specificate.

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

Output:

{
    "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"
        }
    ]
}

Per ulteriori informazioni, consulta Tutorial: creazione di un Application Load Balancer tramite l’AWS CLI nella Guida per l’utente di Application Load Balancer.

Esempio 2: come creare un bilanciatore del carico interno.

L’esempio create-load-balancer seguente crea un Application Load Balancer interno e abilita le zone di disponibilità per le sottoreti specificate.

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

Output:

{
    "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"
        }
    ]
}

Per ulteriori informazioni, consulta Tutorial: creazione di un Application Load Balancer tramite l’AWS CLI nella Guida per l’utente di Application Load Balancer.

Esempio 3: come creare un Network Load Balancer.

L’esempio create-load-balancer seguente crea un Network Load Balancer con connessione a Internet e abilita la zona di disponibilità per la sottorete specificata. Utilizza una mappatura delle sottoreti per associare l’indirizzo IP elastico specificato all’interfaccia di rete utilizzata dai nodi del bilanciatore del carico per la zona di disponibilità.

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

Output:

{
    "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"
        }
    ]
}

Per ulteriori informazioni, consulta Tutorial: creazione di un Network Load Balancer tramite l’AWS CLI nella Guida per l’utente di Network Load Balancer.

Esempio 4: come creare un Gateway Load Balancer.

L’esempio create-load-balancer seguente crea un Gateway Load Balancer e abilita le zone di disponibilità per le sottoreti specificate.

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

Output:

{
    "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"
        }
    ]
}

Per ulteriori informazioni, consulta Nozioni di base sui Gateway Load Balancer utilizzando AWS CLI nella Guida per l’utente di Gateway Load Balancer.

    /*
     * 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)
                    .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 "";
    }

    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] },
    );

Esempio 1: questo esempio crea un nuovo Application Load Balancer con connessione Internet con due sottoreti.

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

Output:

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

Esempio 1: questo esempio crea un nuovo Application Load Balancer con connessione Internet con due sottoreti.

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

Output:

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

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