背景

在云计算飞速发展的今天，用户ECS服务器身处的网络环境越来越复杂，弹性网卡让ECS服务器完美游走在日益复杂的网络环境中。但是以前服务器必须是Stopped状态才可以进行弹性网卡(ENI)的插拔，这样可能会影响运行在服务器上的业务。现在很高兴的向大家宣布：弹性网卡从今天开始支持热插拨，即ECS服务器只要处在稳定状态(Running Stopped)，就可以对弹性网卡进行插拔操作。

弹性网卡热插拔：控制台

• 控制台操作弹性网卡的位置：进入控制台 -> 云服务器 ECS -> 弹性网卡。
• 创建弹性网卡：点击创建弹性网卡按钮，在弹窗中填写网卡名称，选择专有网络 交换机 安全组等信息后创建弹性网卡。
  
• 热挂载弹性网卡：点击弹性网卡对应的绑定实例按钮，在弹窗中选择要绑定实例。实例状态只要求为稳定状态(Running Stopped)。
  
• 热卸载弹性网卡：点击弹性网卡对应的解绑实例按钮，确定即可解绑。实例状态只要求为稳定状态(Running Stopped)。
  

弹性网卡热插拔：OpenAPI

attach_eni detach_eni 分别可以根据弹性网卡ID，实例ID，进行弹性网卡的热插拔。相关API参考帮助文档：挂载弹性网卡，卸载弹性网卡。

#  coding=utf-8

# if the python sdk is not install using 'sudo pip install aliyun-python-sdk-ecs'
# if the python sdk is install using 'sudo pip install --upgrade aliyun-python-sdk-ecs'
# make sure the sdk version is 4.7.1, you can use command 'pip show aliyun-python-sdk-ecs' to check

import json
import logging

from aliyunsdkcore import client
from aliyunsdkecs.request.v20140526.CreateNetworkInterfaceRequest import CreateNetworkInterfaceRequest
from aliyunsdkecs.request.v20140526.AttachNetworkInterfaceRequest import AttachNetworkInterfaceRequest
from aliyunsdkecs.request.v20140526.DetachNetworkInterfaceRequest import DetachNetworkInterfaceRequest
from aliyunsdkecs.request.v20140526.DeleteNetworkInterfaceRequest import DeleteNetworkInterfaceRequest

# configuration the log output formatter, if you want to save the output to file,
# append ",filename='ecs_invoke.log'" after datefmt.

logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
                    datefmt='%a, %d %b %Y %H:%M:%S')


# send open api request
def _send_request(request):
    request.set_accept_format('json')
    try:
        response_str = clt.do_action(request)
        logging.info(response_str)
        response_detail = json.loads(response_str)
        return response_detail
    except Exception as e:
        logging.error(e)


# create eni
def create_eni(vSwitchId, securityGroupId, networkInterfaceName=None, primaryIpAddress=None, description=None,
               clientToken=None):
    request = CreateNetworkInterfaceRequest()
    request.set_VSwitchId(vSwitchId)
    request.set_SecurityGroupId(securityGroupId)
    if (networkInterfaceName != None):
        request.set_NetworkInterfaceName(networkInterfaceName)
    if (primaryIpAddress != None):
        request.set_PrimaryIpAddress(primaryIpAddress)
    if (description != None):
        request.set_Description(description)
    if (clientToken != None):
        request.set_ClientToken(clientToken)
    _send_request(request)


# attach eni to instance
def attach_eni(eniId, instanceId):
    request = AttachNetworkInterfaceRequest()
    request.set_NetworkInterfaceId(eniId)
    request.set_InstanceId(instanceId)
    _send_request(request)


# detach eni from instance
def detach_eni(eniId, instanceId):
    request = DetachNetworkInterfaceRequest()
    request.set_NetworkInterfaceId(eniId)
    request.set_InstanceId(instanceId)
    _send_request(request)


# delete eni
def delete_eni(eniId):
    request = DeleteNetworkInterfaceRequest()
    request.set_NetworkInterfaceId(eniId)
    _send_request(request)


if __name__ == '__main__':
    clt = client.AcsClient('Your Access Key Id', 'Your Access Key Secrect', 'cn-zhangjiakou')
    vSwitchId = "vsw-test"
    securityGroupId = "sg-test"
    # create_eni(vSwitchId=vSwitchId, securityGroupId=securityGroupId)

    attach_eniId = "eni-test"
    attach_instanceId = "i-test"
    # attach_eni(attach_eniId, attach_instanceId)

    detach_eniId = "eni-test"
    detach_instanceId = "i-test"
    # detach_eni(detach_eniId, detach_instanceId)

    delete_eniId = "eni-test"
    # delete_eni(delete_eniId)

小结

现在的弹性网卡热插拔只要求实例为稳定状态即可，改进了以前实例只能为Stopped状态才能插拔弹性网卡的现状。提升了用户体验，现在服务器不用关机就能轻松配置弹性网卡，更加灵活实用。