函數(shù)計(jì)算自動(dòng)化運(yùn)維實(shí)戰(zhàn)3 -- 事件觸發(fā)自動(dòng)創(chuàng)建快照

函數(shù)計(jì)算

阿里云 函數(shù)計(jì)算是一個(gè)事件驅(qū)動(dòng)的全托管計(jì)算服務(wù)。通過函數(shù)計(jì)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(jì)算會(huì)為您準(zhǔn)備好計(jì)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(bào)警等功能。借助于函數(shù)計(jì)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(shí)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。

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(jí)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(shí)現(xiàn)更加完美的的自動(dòng)化運(yùn)維。

函數(shù)計(jì)算進(jìn)行自動(dòng)化運(yùn)維專題" class="reference-link"> 專題傳送門 => 函數(shù)計(jì)算進(jìn)行自動(dòng)化運(yùn)維專題

示例場景

在本文中，重點(diǎn)關(guān)注函數(shù)計(jì)算對(duì)ecs的重啟事件處理，因?yàn)檫@些ecs重啟事件是目前用戶需要很高優(yōu)先級(jí)用戶優(yōu)先級(jí)去響應(yīng)的；假設(shè)之前一臺(tái)ecs 發(fā)生因系統(tǒng)錯(cuò)誤而重啟，用戶可能會(huì)緊急起來做一些驗(yàn)證或者創(chuàng)建快照的處理， 在本示例中，我們對(duì)一臺(tái)因?yàn)橄到y(tǒng)錯(cuò)誤實(shí)例重啟或者因?qū)嵗e(cuò)誤而重啟的機(jī)器進(jìn)行自動(dòng)化處理，比如成功重啟后創(chuàng)建快照處理。

ecs 系統(tǒng)事件
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云產(chǎn)品系統(tǒng)事件監(jiān)控

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(jì)算helloworld

  注：記得給函數(shù)的service的role設(shè)置操作ecs的權(quán)限

• 登錄 云監(jiān)控控制臺(tái), 創(chuàng)建報(bào)警規(guī)則, 監(jiān)控的事件為ecs 因?qū)嵗e(cuò)誤或西戎錯(cuò)誤重啟開始和結(jié)束
  

• mock調(diào)試
  
  

• 模擬真實(shí)的ecs事件
  請(qǐng)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 aliyunsdkecs.request.v20140526.DeleteSnapshotRequest import DeleteSnapshotRequest
from aliyunsdkecs.request.v20140526.CreateSnapshotRequest import CreateSnapshotRequest
from aliyunsdkecs.request.v20140526.DescribeDisksRequest import DescribeDisksRequest
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");
  name = name.lower()
  if name in ['Instance:SystemFailure.Reboot:Executing'.lower(), "Instance:InstanceFailure.Reboot:Executing".lower()]:
    pass
    # do other things
  if name in ['Instance:SystemFailure.Reboot:Executed'.lower(), "Instance:InstanceFailure.Reboot:Executed".lower()]:
    request = DescribeDisksRequest()
    request.add_query_param("RegionId", "cn-shenzhen")
    request.set_InstanceId(ecsInstanceId)
    response = _send_request(request)
    disks = response.get('Disks').get('Disk', [])
    for disk in disks:
      diskId = disk["DiskId"]
      SnapshotId = create_ecs_snap_by_id(diskId)
      LOGGER.info("Create ecs snap sucess, ecs id = %s , disk id = %s ", ecsInstanceId, diskId)
def create_ecs_snap_by_id(disk_id):
    LOGGER.info("Create ecs snap, disk id is %s ", disk_id)
    request = CreateSnapshotRequest()
    request.set_DiskId(disk_id)
    request.set_SnapshotName("reboot_" + ''.join(random.choice(string.ascii_lowercase) for _ in range(6)))
    response = _send_request(request)
    return response.get("SnapshotId")
# 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)