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本文介绍如何使用Alibaba Cloud SDK for Python从NAT网关上绑定和解绑一个弹性公网IP。

前提条件

在使用Alibaba Cloud SDK for Python前，您需要完成以下准备工作：

您需要一个阿里云账号和访问密钥（AccessKey）。请在阿里云控制台中的AccessKey管理页面上创建和查看您的AccessKey。
确保您已经安装了Alibaba Cloud SDK for Python，请参见aliyun-python-sdk-vpc 3.0.11。
下载阿里云专有网络Python SDK场景示例的VPC Python Example库。
进入 setup.py所在的目录，执行如下命令，完成环境初始化配置。
```
python setup.py install
```

操作步骤

在下载的SDK目录中，打开$aliyun-openapi-python-sdk-examples\sdk_examples\examples\natgw文件夹。

使用编辑器打开natgw_associate_eip.py文件，根据实际情况配置相关参数，保存退出。

下述代码示例中包含以下操作：

在华东2（上海）地域创建一个VPC。
在新建的VPC下创建一个VSwitch。
在新建的VPC下创建一个NAT网关。
在华东2（上海）地域创建一个EIP。
将创建的EIP绑定到NAT网关。
查询绑定到NAT网关的EIP。
在华东2（上海）地域创建共享带宽实例。
添加EIP到共享带宽实例。
查询已创建的NAT网关。
将EIP与NAT网关解绑。
将EIP从共享带宽实例中移出。
删除共享带宽实例。
删除NAT网关。
释放EIP。
删除VSwitch。
删除VPC。

#encoding=utf-8
import sys
import json
import time

from aliyunsdkcore.acs_exception.exceptions import ServerException, ClientException
from aliyunsdkvpc.request.v20160428 import CreateNatGatewayRequest
from aliyunsdkvpc.request.v20160428 import DeleteNatGatewayRequest
from aliyunsdkvpc.request.v20160428 import DescribeNatGatewaysRequest
from sdk_lib.sdk_vpc import Vpc
from sdk_lib.sdk_vswitch import VSwitch
from sdk_lib.sdk_eip import Eip
from sdk_lib.sdk_cbwp import CommonBandwidthPackage
from sdk_lib.common_util import CommonUtil
from sdk_lib.check_status import CheckStatus
from sdk_lib.exception import ExceptionHandler
from sdk_lib.consts import *

client = AcsClient(
    'accessKeyId',
    'accessSecret',
    'RegionId'
    #timeout = 35
)


class NatGateway(object):
    def __init__(self, client):
        self.client = client

    def create_nat_gateway(self, params):
        """
        create_nat_gateway: 创建Nat Gateway
        """
        try:
            request = CreateNatGatewayRequest.CreateNatGatewayRequest()
            request.set_VpcId(params['vpc_id'])
            response = client.do_action_with_exception(request)
            response_json = json.loads(response)
            # 判断Nat Gateway状态是否可用
            if CheckStatus.check_status(TIME_DEFAULT_OUT, DEFAULT_TIME,
                                        self.describe_nat_gateway_status,
                                        AVAILABLE, response_json['NatGatewayId']):
                return response_json
        except ServerException as e:
            ExceptionHandler.server_exception(e)
        except ClientException as e:
            ExceptionHandler.client_exception(e)

    def describe_nat_gateway(self, nat_gateway_id):
        """
        describe_nat_gateway: 查询指定地域已创建的Nat Gateway的信息
        """
        try:
            request = DescribeNatGatewaysRequest.DescribeNatGatewaysRequest()
            request.set_NatGatewayId(nat_gateway_id)
            response = client.do_action_with_exception(request)
            response_json = json.loads(response)
            return response_json
        except ServerException as e:
            ExceptionHandler.server_exception(e)
        except ClientException as e:
            ExceptionHandler.client_exception(e)

    def delete_nat_gateway(self, params):
        """
        delete_nat_gateway: 删除Nat Gateway
        """
        try:
            request = DeleteNatGatewayRequest.DeleteNatGatewayRequest()
            request.set_NatGatewayId(params['nat_gateway_id'])
            response = client.do_action_with_exception(request)
            response_json = json.loads(response)
            # 判断Nat Gateway状态是否可用
            if CheckStatus.check_status(TIME_DEFAULT_OUT, DEFAULT_TIME * 5,
                                        self.describe_nat_gateway_status,
                                        '', params['nat_gateway_id']):
                return response_json
        except ServerException as e:
            ExceptionHandler.server_exception(e)
        except ClientException as e:
            ExceptionHandler.client_exception(e)

    def describe_nat_gateway_status(self, nat_gateway_id):
        """
        describe_nat_gateway_status: 查询指定地域已创建的Nat Gateway的状态
        """
        response = self.describe_nat_gateway(nat_gateway_id)
        if len(response["NatGateways"]["NatGateway"]) == 0:
            return ''
        return response["NatGateways"]["NatGateway"][0]['Status']


def main():
    vpc = Vpc(client)
    vswitch = VSwitch(client)
    eip = Eip(client)
    cbwp = CommonBandwidthPackage(client)
    nat_gateway = NatGateway(client)

    params = {}

    # 创建VPC
    vpc_json = vpc.create_vpc()
    CommonUtil.log("create_vpc", vpc_json)

    # 创建VSwitch
    params['vpc_id'] = vpc_json['VpcId']
    params['zone_id'] = "cn-shanghai-d"
    params['cidr_block'] = "172.16.1.0/24"
    vswitch_json = vswitch.create_vswitch(params)
    CommonUtil.log("create_vswitch", vswitch_json)

    # 创建Nat Gateway
    nat_gateway_json = nat_gateway.create_nat_gateway(params)
    CommonUtil.log("create_nat_gateway", nat_gateway_json)

    # 创建EIP
    eip_response_json = eip.allocate_eip_address(params)
    CommonUtil.log("allocate_eip_address", eip_response_json)
    params['allocation_id'] = eip_response_json["AllocationId"]

    # 绑定EIP到Nat Gateway
    params['instance_id'] = nat_gateway_json['NatGatewayId']
    params['allocation_id'] = eip_response_json["AllocationId"]
    params['instance_type'] = 'Nat'
    eip_response_json = eip.associate_eip_address(params)
    CommonUtil.log("associate_eip_address eip", eip_response_json)

    # 查询EIP
    eip_response_json = eip.describe_eip_address(params['allocation_id'])
    CommonUtil.log("describe_eip_address", eip_response_json)

    # 创建带宽包
    params['bandwidth'] = BANDWIDTH_10
    cbwp_repsonse_json = cbwp.create_common_bandwidth_package(params)
    CommonUtil.log("create_common_bandwidth_package", cbwp_repsonse_json)

    # 添加EIP到共享带宽包中
    params['ip_instance_id'] = params['allocation_id']
    params['bandwidth_package_id'] = cbwp_repsonse_json['BandwidthPackageId']
    cbwp_repsonse_json = cbwp.add_common_bandwidth_packageIp(params)
    CommonUtil.log("add_common_bandwidth_packageIp", cbwp_repsonse_json)

    # 查询Nat Gateway
    params['nat_gateway_id'] = nat_gateway_json['NatGatewayId']
    nat_gateway_json = nat_gateway.describe_nat_gateway(params['nat_gateway_id'])
    CommonUtil.log("describe_nat_gateway", nat_gateway_json)

    # 解绑EIP
    eip_response_json = eip.unassociate_eip_address(params)
    CommonUtil.log("unassociate_eip_address nat", eip_response_json)

    # 移除共享带宽包中的EIP
    cbwp_repsonse_json = cbwp.remove_common_bandwidth_packageIp(params)
    CommonUtil.log("remove_common_bandwidth_packageIp", cbwp_repsonse_json)

    # 删除共享带宽包
    params['force'] = True
    cbwp_repsonse_json = cbwp.delete_common_bandwidth_package(params)
    CommonUtil.log("delete_common_bandwidth_package", cbwp_repsonse_json)

    # 删除Nat Gateway
    nat_gateway_json = nat_gateway.delete_nat_gateway(params)
    CommonUtil.log("delete_nat_gateway", nat_gateway_json)

    # 释放EIP
    eip_response_json = eip.release_eip_address(params)
    CommonUtil.log("release_eip_address", eip_response_json)

    # 删除VSwitch
    params['vswitch_id'] = vswitch_json['VSwitchId']
    vswitch_json = vswitch.delete_vswitch(params)
    CommonUtil.log("delete_vswitch", vswitch_json)

    # 删除VPC
    vpc_json = vpc.delete_vpc(params)
    CommonUtil.log("delete_vpc", vpc_json)


if __name__ == "__main__":
    sys.exit(main())

进入natgw_associate_eip.py所在的目录，执行以下命令，绑定和解绑EIP。
```
python natgw_associate_eip.py
```

执行结果

系统回显结果如下：

---------------------------create_vpc---------------------------
{
  "ResourceGroupId": "rg-acfmxaz****",
  "RouteTableId": "vtb-uf6agemvkcmd8****",
  "VRouterId": "vrt-uf6r7lqtsv65d****",
  "VpcId": "vpc-uf6mqfqx8vjmo****",
  "RequestId": "ADF806C6-FCD6-4E46-B8E3-72C2BE895344"
}

---------------------------create_vswitch---------------------------
{
  "VSwitchId": "vsw-uf6rm6add6w89****",
  "RequestId": "897FFCC1-E6BA-484E-A245-C5DAEBBA269C"
}

---------------------------create_nat_gateway---------------------------
{
  "NatGatewayId": "ngw-uf681h38pbvly****",
  "BandwidthPackageIds": {
    "BandwidthPackageId": []
  },
  "ForwardTableIds": {
    "ForwardTableId": [
      "ftb-uf6jd0vbyao2d****"
    ]
  },
  "RequestId": "7C7CD3CB-041A-4B80-80B4-8BF8D5EF0D26",
  "SnatTableIds": {
    "SnatTableId": [
      "stb-uf6uj997htg3u****"
    ]
  }
}

---------------------------allocate_eip_address---------------------------
{
  "EipAddress": "106.XX.XX.129",
  "ResourceGroupId": "rg-acfmxaz****",
  "RequestId": "DB795B99-1CEA-4FC1-9CE3-9DE2B977BF02",
  "AllocationId": "eip-uf62tf8y4uyac****"
}

---------------------------associate_eip_address eip---------------------------
{
  "RequestId": "443D7060-B716-4193-A44D-23FE762004F8"
}

---------------------------describe_eip_address---------------------------
{
  "TotalCount": 1,
  "PageNumber": 1,
  "PageSize": 10,
  "EipAddresses": {
    "EipAddress": [
      {
        "ISP": "BGP",
        "ExpiredTime": "",
        "InternetChargeType": "PayByBandwidth",
        "IpAddress": "106.XX.XX.129",
        "AllocationId": "eip-uf62tf8y4uyac****",
        "PrivateIpAddress": "",
        "Status": "InUse",
        "BandwidthPackageId": "",
        "InstanceId": "ngw-uf681h38pbvly****",
        "InstanceRegionId": "cn-shanghai",
        "RegionId": "cn-shanghai",
        "AvailableRegions": {
          "AvailableRegion": [
            "cn-shanghai"
          ]
        },
        "ResourceGroupId": "rg-acfmxaz****",
        "HasReservationData": false,
        "InstanceType": "Nat",
        "AllocationTime": "2019-04-24T10:03:08Z",
        "Name": "",
        "OperationLocks": {
          "LockReason": []
        },
        "Mode": "NAT",
        "BandwidthPackageType": "",
        "BandwidthPackageBandwidth": "",
        "Bandwidth": "5",
        "HDMonitorStatus": "OFF",
        "ChargeType": "PostPaid",
        "SecondLimited": false,
        "Descritpion": ""
      }
    ]
  },
  "RequestId": "F0AEE605-14AD-4ADD-980C-4B508CE7EE4B"
}

---------------------------create_common_bandwidth_package----------------------
-----
{
  "ResourceGroupId": "rg-acfmxaz****",
  "BandwidthPackageId": "cbwp-uf6dmfvq0gzzg****",
  "RequestId": "D5E02777-2A72-42EC-8308-5D4B6E56D900"
}

---------------------------add_common_bandwidth_packageIp-----------------------
----
{
  "RequestId": "3B4CD99C-6E59-4DA2-9256-EACF3F699412"
}

---------------------------describe_nat_gateway---------------------------
{
  "TotalCount": 1,
  "PageNumber": 1,
  "RequestId": "A07498A0-4D60-4E0F-A7DE-3A832B174D59",
  "PageSize": 10,
  "NatGateways": {
    "NatGateway": [
      {
        "Status": "Available",
        "BandwidthPackageIds": {
          "BandwidthPackageId": []
        },
        "VpcId": "vpc-uf6mqfqx8vjmo****",
        "Description": "",
        "ForwardTableIds": {
          "ForwardTableId": [
            "ftb-uf6jd0vbyao2d****"
          ]
        },
        "IpLists": {
          "IpList": [
            {
              "UsingStatus": "Idle",
              "IpAddress": "106.XX.XX.129",
              "AllocationId": "eip-uf62tf8y4uyac****"
            }
          ]
        },
        "BusinessStatus": "Normal",
        "RegionId": "cn-shanghai",
        "CreationTime": "2019-04-24T10:03:05Z",
        "NatGatewayId": "ngw-uf681h38pbvly****",
        "SnatTableIds": {
          "SnatTableId": [
            "stb-uf6uj997htg3u****"
          ]
        },
        "AutoPay": false,
        "InstanceChargeType": "PostPaid",
        "ExpiredTime": "",
        "Spec": "Small",
        "Name": ""
      }
    ]
  }
}

---------------------------unassociate_eip_address nat--------------------------
-
{
  "RequestId": "92CB670E-239D-4659-B91F-E0565D5C0F2D"
}

---------------------------remove_common_bandwidth_packageIp--------------------
-------
{
  "RequestId": "A58E9647-6761-4CA3-8786-3CD4E7D2A7AB"
}

---------------------------delete_common_bandwidth_package----------------------
-----
{
  "RequestId": "4AA428BC-B72F-4567-94B8-AC2398EF7529"
}

---------------------------delete_nat_gateway---------------------------
{
  "RequestId": "EC6C5D04-AF7D-4560-A30E-80EC141D174D"
}

---------------------------release_eip_address---------------------------
{
  "RequestId": "9B1380B3-EE97-49BD-88FE-DBF356304208"
}

---------------------------delete_vswitch---------------------------
{
  "RequestId": "A9A1D63E-5709-4B98-90BF-9069AA264230"
}

---------------------------delete_vpc---------------------------
{
  "RequestId": "3B687C37-5315-4E0B-BE13-103BB287A80D"
}

开放平台

专有网络 VPC

绑定和解绑EIP

前提条件

操作步骤

执行结果

FAQ