函數(shù)計算

阿里云函數(shù)計算是一個事件驅(qū)動的全托管計算服務(wù)。通過函數(shù)計算，您無需管理服務(wù)器等基礎(chǔ)設(shè)施，只需編寫代碼并上傳。函數(shù)計算會為您準(zhǔn)備好計算資源，以彈性、可靠的方式運(yùn)行您的代碼，并提供日志查詢，性能監(jiān)控，報警等功能。借助于函數(shù)計算，您可以快速構(gòu)建任何類型的應(yīng)用和服務(wù)，無需管理和運(yùn)維。更棒的是，您只需要為代碼實際運(yùn)行消耗的資源付費(fèi)，而代碼未運(yùn)行則不產(chǎn)生費(fèi)用。

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云監(jiān)控

阿里云云監(jiān)控為云上用戶提供開箱即用的企業(yè)級開放型一站式監(jiān)控解決方案。涵蓋 IT 設(shè)施基礎(chǔ)監(jiān)控，外網(wǎng)網(wǎng)絡(luò)質(zhì)量撥測監(jiān)控，基于事件、自定義指標(biāo)、日志的業(yè)務(wù)監(jiān)控。為您全方位提供更高效、更全面、更省錢的監(jiān)控服務(wù)。

云監(jiān)控提供了豐富事件，并且事件還在不斷豐富中（云產(chǎn)品系統(tǒng)事件監(jiān)控）， 豐富的事件觸發(fā)自定義處理的函數(shù)，可以實現(xiàn)更加完美的的自動化運(yùn)維。

專題傳送門 => 函數(shù)計算進(jìn)行自動化運(yùn)維專題

示例場景

假設(shè)兩臺 ECS 機(jī)器A, B, A 機(jī)器出現(xiàn)了宕機(jī)，這個時候需要把 A 機(jī)器上的 eip 遷移到備用機(jī)器 B 上，這個利用云監(jiān)控的報警和函數(shù)計算可以實現(xiàn)EIP的自動遷移， 云監(jiān)控檢測到 A 宕機(jī)這個事件，然后觸發(fā)函數(shù)執(zhí)行，函數(shù)實現(xiàn) eip 的自動遷移

操作步驟

• 創(chuàng)建函數(shù)(函數(shù)代碼在文末),函數(shù)創(chuàng)建可參考函數(shù)計算helloworld

  注：記得給函數(shù)的 service 的 role 設(shè)置操作 ecs 和 eip 的權(quán)限
  cdn.com/969096ef4233ea658e1ccf75686a7c4620269329.png">

• 登錄云監(jiān)控控制臺, 創(chuàng)建報警規(guī)則, 監(jiān)控的事件為 ecs 重啟開始

• mock調(diào)試

• 模擬真實的 ecs 事件

• 請參考演練系統(tǒng)事件處理程序？ So Easy~

代碼

# -*- coding: utf-8 -*-
import logging
import json, random, string, time
from aliyunsdkcore import client
from aliyunsdkvpc.request.v20160428.AssociateEipAddre***equest import AssociateEipAddre***equest
from aliyunsdkvpc.request.v20160428.UnassociateEipAddre***equest import UnassociateEipAddre***equest
from aliyunsdkvpc.request.v20160428.DescribeEipAddressesRequest import DescribeEipAddressesRequest
from aliyunsdkcore.auth.credentials import StsTokenCredential
LOGGER = logging.getLogger()
clt = None
def handler(event, context):
  creds = context.credentials
  sts_token_credential = StsTokenCredential(creds.access_key_id, creds.access_key_secret, creds.security_token)
  '''
  {
    "product": "ECS",
    "content": {
        "executeFinishTime": "2018-06-08T01:25:37Z",
        "executeStartTime": "2018-06-08T01:23:37Z",
        "ecsInstanceName": "timewarp",
        "eventId": "e-t4nhcpqcu8fqushpn3mm",
        "eventType": "InstanceFailure.Reboot",
        "ecsInstanceId": "i-bp18l0uopocfc98xxxx" 
    },
    "resourceId": "acs:ecs:cn-hangzhou:123456789:instance/i-bp18l0uopocfc98xxxx",
    "level": "CRITICAL",
    "instanceName": "instanceName",
    "status": "Executing",
    "name": "Instance:SystemFailure.Reboot:Executing", 
    "regionId": "cn-hangzhou"
  }
  '''
  evt = json.loads(event)
  content = evt.get("content");
  ecsInstanceId = content.get("ecsInstanceId");
  regionId = evt.get("regionId");

  global clt
  clt = client.AcsClient(region_id=regionId, credential=sts_token_credential)

  name = evt.get("name");
  eipId = "eip-bp1nexxxc7zjfnex6i0";
  standbyEcsId = "i-bp19yycxx7yroukxpv"
  name = name.lower()

  if name in ['Disk:Stalled:Executing'.lower(), 'Instance:SystemFailure.Reboot:Executing'.lower(), "Instance:InstanceFailure.Reboot:Executing".lower()]:
    print("move eip to standbyEcs");
    move_eip(ecsInstanceId, standbyEcsId, eipId) # move eip to standbyEcs
  else:
    # other event to do 
    pass

def getEipStatus(eip):
  request = DescribeEipAddressesRequest()
  request.set_AllocationId(eip)
  request.add_query_param("RegionId", "cn-hangzhou")
  response = _send_request(request)
  if isinstance(response, dict) and "RequestId" in response:
    EipAddresses = response.get('EipAddresses', {})
    EipAddress = EipAddresses['EipAddress'][0]
    status = EipAddress['Status']
    return status
  else:
    LOGGER.error("getEipAddressDesc {} fail".format(eip))
def unAssociateEip(ecs_id, eip):
  request = UnassociateEipAddre***equest()
  request.set_AllocationId(eip)
  request.set_InstanceType('EcsInstance')
  request.set_InstanceId(ecs_id)
  response = _send_request(request)
  if isinstance(response, dict) and "RequestId" in response:
    LOGGER.info("UnassociateEipAddress {} from {} succ".format(ecs_id, eip))
  else:
    LOGGER.error("UnassociateEipAddress {} from {} fail".format(ecs_id, eip))
def associateEip(ecs_id, eip):
  associte_request = AssociateEipAddre***equest()
  associte_request.set_AllocationId(eip)
  associte_request.set_InstanceType('EcsInstance')
  associte_request.set_InstanceId(ecs_id)
  associte_response = _send_request(associte_request)
  if isinstance(associte_response, dict) and "RequestId" in associte_response:
    LOGGER.info("AssociateEipAddress {} to {} succ".format(eip, ecs_id))
    return True
  return False
def move_eip(from_ecs, to_ecs, eip):
  unAssociateEip(from_ecs, eip)
  # wait unAssociateEip ...
  time.sleep(3)
  # retry 30s util sucess
  for i in xrange(10):
    eip_status = getEipStatus(eip).lower()
    if eip_status == 'available':
      if associateEip(to_ecs, eip):
        LOGGER.info("AssociateEipAddress {} to {} succ".format(eip, to_ecs))
        return
    else:
      LOGGER.info("eip status = {}".format(eip_status))
      time.sleep(3)
  LOGGER.info("AssociateEipAddress {} to {} fail".format(eip, to_ecs))
# send open api request
def _send_request(request):
    request.set_accept_format('json')
    try:
        response_str = clt.do_action_with_exception(request)
        LOGGER.info(response_str)
        response_detail = json.loads(response_str)
        return response_detail
    except Exception as e:
        LOGGER.error(e)

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