三快一分稳定—函数计算自动化运维实战1 -- 定时任务

函数计算

阿里云函数计算是一个事件驱动的全托管计算服务。三快一分稳定通过函数计算,您无需管理服务器等基础设施,只需编写代码并上传。函数计算会为您准备好计算资源,以弹性、可靠的方式运行您的代码,并提供日志查询,性能监控,报警等功能。借助于函数计算,您可以快速构建任何类型的应用和服务,无需管理和运维。更棒的是,您只需要为代码实际运行消耗的资源付费,而代码未运行则不产生费用。

函数计算中的TimeTrigger

触发器是触发函数执行的方式。有时候您不想手动调用函数执行,您希望当某件事情发生时自动触发函数的执行,这个事情就是事件源。三快一分稳定您可以通过配置触发器的方式设置事件源触发函数执行。
例如,设置定时触发器,可以在某个时间点触发函数执行或者每隔5分钟触发函数一次;函数计算timetrigger

专题传送门 => 函数计算进行自动化运维专题

定时任务自动化场景分析

定时任务示例场景1

某些账号ak需要定期更换,以确保ak安全;
在下面的代码示例中,授权service具有访问kms权限的能力,使用kms,先对一个具有创建和删除ak权限的ak加密密文解密,获取具有创建和删除ak权限的AK, 之后利用这个AK进行ak的创建和删除操作

说明: 除了使用kms加密解密来获取较大权限的AK, 通过函数计算环境变量的设置也是一种很好的方法

操作步骤

_1

  • 函数代码(函数计算已经内置了相关sdk,直接使用下面的代码即可)
# -*- coding: utf-8 -*-
import logging, time, json
from aliyunsdkcore import client
from aliyunsdkram.request.v20150501.CreateAccessKeyRequest import CreateAccessKeyRequest
from aliyunsdkram.request.v20150501.DeleteAccessKeyRequest import DeleteAccessKeyRequest
from aliyunsdkkms.request.v20160120.EncryptRequest import EncryptRequest
from aliyunsdkkms.request.v20160120.DecryptRequest import DecryptRequest
from aliyunsdkcore.auth.credentials import StsTokenCredential
# ak Encrypt content
AK_CiphertextBlob = "NmQyY2ZhODMtMTlhYS00MTNjLTlmZjAtZTQxYTFiYWVmMzZmM1B1NXhTZENCNXVWd1dhdTNMWVRvb3V6dU9QcVVlMXRBQUFBQUFBQUFBQ3gwZTkzeGhDdHVzMWhDUCtZeVVuMWlobzlCa3VxMlErOXFHWWdXXXHELLwL1NSZTFvUURYSW9lak5Hak1lMnF0R2I1TWUxMEJiYmkzVnBwZHlrWGYzc3kyK2tQbGlKb2lHQ3lrZUdieHN2eXZwSVYzN2Qyd1cydz09"
USER_NAME = "ls-test" # sub-account name
LOGGER = logging.getLogger()
def handler(event, context):
  creds = context.credentials
  sts_token_credential = StsTokenCredential(creds.access_key_id, creds.access_key_secret, creds.security_token)
  # this demo ecs and function in same region, if not in same region, you need change region_id to your ecs instance's region_id
  clt = client.AcsClient(region_id=context.region, credential=sts_token_credential)
  request = DecryptRequest()
  request.set_CiphertextBlob(AK_CiphertextBlob)
  response = _send_request(clt, request)
  ak_info = json.loads(response.get("Plaintext","{}"))
  if not ak_info:
    return "KMS Decrypt ERROR"
  ak_id = ak_info["ak_id"]
  ak_secret = ak_info["ak_secret"]
  LOGGER.info("Decrypt sucessfully with key id: {}".format(response.get("KeyId","{}")))
  clt2 = client.AcsClient(ak_id, ak_secret, context.region)
  request = CreateAccessKeyRequest()
  request.set_UserName(USER_NAME) # 给子账号ls-test创建AK
  response = _send_request(clt2, request)
  create_ak_id = response.get("AccessKey",{}).get("AccessKeyId")
  if not create_ak_id:
    return
  LOGGER.info("create ak {} sucess!".format(create_ak_id))
  
  time.sleep(10)
  
  request = DeleteAccessKeyRequest()
  request.set_UserName(USER_NAME)  
  request.set_UserAccessKeyId(create_ak_id)
  response = _send_request(clt2, request)
  LOGGER.info("delete ak {} sucess!".format(create_ak_id))
  
  return "OK"
  
# send open api request
def _send_request(clt, request):
    request.set_accept_format('json')
    try:
        response_str = clt.do_action_with_exception(request)
        LOGGER.debug(response_str)
        response_detail = json.loads(response_str)
        return response_detail
    except Exception as e:
        LOGGER.error(e)

AK 存在环境变量版本

# -*- coding: utf-8 -*-
import os, logging, time, json
from aliyunsdkcore import client
from aliyunsdkram.request.v20150501.CreateAccessKeyRequest import CreateAccessKeyRequest
from aliyunsdkram.request.v20150501.DeleteAccessKeyRequest import DeleteAccessKeyRequest
USER_NAME = "ls-test" # sub-account name
LOGGER = logging.getLogger()
def handler(event, context):
  ak_id = os.environ['AK_ID']
  ak_secret = os.environ['AK_SECRET']
  clt = client.AcsClient(ak_id, ak_secret, context.region)
  request = CreateAccessKeyRequest()
  request.set_UserName(USER_NAME) # 给子账号USER_NAME创建AK
  response = _send_request(clt, request)
  create_ak_id = response.get("AccessKey", "").get("AccessKeyId")
  if not create_ak_id:
    return
  LOGGER.info("create ak {} sucess!".format(create_ak_id))
  
  time.sleep(5)
  
  request = DeleteAccessKeyRequest()
  request.set_UserName(USER_NAME)  
  request.set_UserAccessKeyId(create_ak_id)
  response = _send_request(clt, request)
  LOGGER.info("delete ak {} sucess!".format(create_ak_id))
  
  return "OK"
  
# send open api request
def _send_request(clt, 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)

定时任务示例场景2

定期检查自己ecs对应暴露的端口,确保安全,比如你的ecs是一个网站服务器,可能只需要对外暴露80端口就行,如果出现0.0.0.0/0这种允许所有人访问的,需要出现报警或者自动修复

操作步骤

# -*- coding: utf-8 -*-
import logging
import json, random, string, time
from aliyunsdkcore import client
from aliyunsdkecs.request.v20140526.DescribeInstancesRequest import DescribeInstancesRequest
from aliyunsdkecs.request.v20140526.DescribeSecurityGroupAttributeRequest import DescribeSecurityGroupAttributeRequest
from aliyunsdkcore.auth.credentials import StsTokenCredential
LOGGER = logging.getLogger()
clt = None
# 需要检查的ecs列表, 修改成你的ecs id 列表
ECS_INST_IDS = ["i-uf6h07zdscdg9g55zkxx", "i-uf6bwkxfxh847a1e2xxx"]
def handler(event, context):
  creds = context.credentials
  global clt
  sts_token_credential = StsTokenCredential(creds.access_key_id, creds.access_key_secret, creds.security_token)
  # this demo ecs and function in same region, if not in same region, you need change region_id to your ecs instance's region_id
  clt = client.AcsClient(region_id=context.region, credential=sts_token_credential)
  invalid_perssions = {}
  for ecs_id in ECS_INST_IDS:
    ret = check_and_modify_security_rule(ecs_id)
    if ret:
      invalid_perssions[ecs_id] = ret
  return invalid_perssions
def check_and_modify_security_rule(instance_id):
  LOGGER.info("check_and_modify_security_rule, instance_id  is %s ", instance_id)
  request = DescribeInstancesRequest()
  request.set_InstanceIds(json.dumps([instance_id]))
  response = _send_request(request)
  SecurityGroupIds = []
  if response is not None:
    instance_list = response.get('Instances', {}).get('Instance')
    for item in instance_list:
      SecurityGroupIds = item.get('SecurityGroupIds', {}).get("SecurityGroupId", [])
      break
  if not SecurityGroupIds:
    LOGGER.error("ecs {} do not have SecurityGroupIds".format(instance_id))
    return 
  
  invalid_perssions = []
  
  for sg_id in SecurityGroupIds:
    request = DescribeSecurityGroupAttributeRequest()
    request.set_SecurityGroupId(sg_id)
    response = _send_request(request)
    LOGGER.info("Find a securityGroup id {}".format(sg_id))
    permissions = response.get("Permissions", {}).get("Permission",[])
    if not permissions:
      continue
    for permission in permissions:
      if permission["Direction"] == "ingress" and permission["SourceCidrIp"] == "0.0.0.0/0":
        LOGGER.error("ecs {0} , SecurityGroup id {1}, have a risk, need fix; permission = {2}".format(instance_id, sg_id, permission))
        invalid_perssions.append(permission)
        
  return invalid_perssions
# send open api request
def _send_request(request):
    request.set_accept_format('json')
    try:
        response_str = clt.do_action_with_exception(request)
        LOGGER.debug(response_str)
        response_detail = json.loads(response_str)
        return response_detail
    except Exception as e:
        LOGGER.error(e)

“ 阿里巴巴云原生微信公众号(ID:Alicloudnative)关注微服务、Serverless、容器、Service Mesh等技术领域、聚焦云原生流行技术趋势、云原生大规模的落地实践,做最懂云原生开发者的技术公众号。”

posted @ 2019-12-03 09:59  阿里巴巴云原生  阅读(...)  评论(... 编辑 收藏