Associate an Elastic IP address with an Amazon EC2 instance using an Amazon SDK

    /// <summary>
    /// Associate an Elastic IP address to an EC2 instance.
    /// </summary>
    /// <param name="allocationId">The allocation Id of an Elastic IP address.</param>
    /// <param name="instanceId">The instance Id of the EC2 instance to
    /// associate the address with.</param>
    /// <returns>The association Id that represents
    /// the association of the Elastic IP address with an instance.</returns>
    public async Task<string> AssociateAddress(string allocationId, string instanceId)
    {
        var request = new AssociateAddressRequest
        {
            AllocationId = allocationId,
            InstanceId = instanceId
        };

        var response = await _amazonEC2.AssociateAddressAsync(request);
        return response.AssociationId;
    }

    Aws::EC2::EC2Client ec2Client(clientConfiguration);

    Aws::EC2::Model::AssociateAddressRequest associate_request;
    associate_request.SetInstanceId(instanceId);
    associate_request.SetAllocationId(allocationId);

    const Aws::EC2::Model::AssociateAddressOutcome associate_outcome =
            ec2Client.AssociateAddress(associate_request);
    if (!associate_outcome.IsSuccess()) {
        std::cerr << "Failed to associate Elastic IP address " << allocationId
                  << " with instance " << instanceId << ":" <<
                  associate_outcome.GetError().GetMessage() << std::endl;
        return false;
    }

    std::cout << "Successfully associated Elastic IP address " << allocationId
              << " with instance " << instanceId << std::endl;

    public static String associateAddress(Ec2Client ec2, String instanceId, String allocationId) {
        try {
            AssociateAddressRequest associateRequest = AssociateAddressRequest.builder()
                .instanceId(instanceId)
                .allocationId(allocationId)
                .build();

            AssociateAddressResponse associateResponse = ec2.associateAddress(associateRequest);
            return associateResponse.associationId();

        } catch (Ec2Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return "";
    }

import { AssociateAddressCommand } from "@aws-sdk/client-ec2";

import { client } from "../libs/client.js";

export const main = async () => {
  // You need to allocate an Elastic IP address before associating it with an instance.
  // You can do that with the AllocateAddressCommand.
  const allocationId = "ALLOCATION_ID";
  // You need to create an EC2 instance before an IP address can be associated with it.
  // You can do that with the RunInstancesCommand.
  const instanceId = "INSTANCE_ID";
  const command = new AssociateAddressCommand({
    AllocationId: allocationId,
    InstanceId: instanceId,
  });

  try {
    const { AssociationId } = await client.send(command);
    console.log(
      `Address with allocation ID ${allocationId} is now associated with instance ${instanceId}.`,
      `The association ID is ${AssociationId}.`
    );
  } catch (err) {
    console.error(err);
  }
};

suspend fun associateAddressSc(instanceIdVal: String?, allocationIdVal: String?): String? {
    val associateRequest = AssociateAddressRequest {
        instanceId = instanceIdVal
        allocationId = allocationIdVal
    }

    Ec2Client { region = "us-west-2" }.use { ec2 ->
        val associateResponse = ec2.associateAddress(associateRequest)
        return associateResponse.associationId
    }
}

class ElasticIpWrapper:
    """Encapsulates Amazon Elastic Compute Cloud (Amazon EC2) Elastic IP address actions."""
    def __init__(self, ec2_resource, elastic_ip=None):
        """
        :param ec2_resource: A Boto3 Amazon EC2 resource. This high-level resource
                             is used to create additional high-level objects
                             that wrap low-level Amazon EC2 service actions.
        :param elastic_ip: A Boto3 VpcAddress object. This is a high-level object that
                           wraps Elastic IP actions.
        """
        self.ec2_resource = ec2_resource
        self.elastic_ip = elastic_ip

    @classmethod
    def from_resource(cls):
        ec2_resource = boto3.resource('ec2')
        return cls(ec2_resource)

    def associate(self, instance):
        """
        Associates an Elastic IP address with an instance. When this association is
        created, the Elastic IP's public IP address is immediately used as the public
        IP address of the associated instance.

        :param instance: A Boto3 Instance object. This is a high-level object that wraps
                         Amazon EC2 instance actions.
        :return: A response that contains the ID of the association.
        """
        if self.elastic_ip is None:
            logger.info("No Elastic IP to associate.")
            return

        try:
            response = self.elastic_ip.associate(InstanceId=instance.id)
        except ClientError as err:
            logger.error(
                "Couldn't associate Elastic IP %s with instance %s. Here's why: %s: %s",
                self.elastic_ip.allocation_id, instance.id,
                err.response['Error']['Code'], err.response['Error']['Message'])
            raise
        return response

# Associates an Elastic IP address with an Amazon Elastic Compute Cloud
# (Amazon EC2) instance.
#
# Prerequisites:
#
# - The allocation ID corresponding to the Elastic IP address.
# - The Amazon EC2 instance.
#
# @param ec2_client [Aws::EC2::Client] An initialized EC2 client.
# @param allocation_id [String] The ID of the allocation corresponding to
#   the Elastic IP address.
# @param instance_id [String] The ID of the instance.
# @return [String] The assocation ID corresponding to the association of the
#   Elastic IP address to the instance.
# @example
#   puts allocate_elastic_ip_address(
#     Aws::EC2::Client.new(region: 'us-west-2'),
#     'eipalloc-04452e528a66279EX',
#     'i-033c48ef067af3dEX')
def associate_elastic_ip_address_with_instance(
  ec2_client,
  allocation_id,
  instance_id
)
  response = ec2_client.associate_address(
    allocation_id: allocation_id,
    instance_id: instance_id,
  )
  return response.association_id
rescue StandardError => e
  puts "Error associating Elastic IP address with instance: #{e.message}"
  return "Error"
end

    TRY.
        oo_result = lo_ec2->associateaddress(                         " oo_result is returned for testing purposes. "
            iv_allocationid = iv_allocation_id
            iv_instanceid = iv_instance_id
        ).
        MESSAGE 'Associated an Elastic IP address with an EC2 instance.' TYPE 'I'.
      CATCH /aws1/cx_rt_service_generic INTO DATA(lo_exception).
        DATA(lv_error) = |"{ lo_exception->av_err_code }" - { lo_exception->av_err_msg }|.
        MESSAGE lv_error TYPE 'E'.
    ENDTRY.