函数计算对进行自动化运维的一些姿势函数计算对进行自动化运维的一些姿势rsong2018-04-1211:21:38浏览6

函数计算对进行自动化运维的一些姿势

rsong 2018-04-12 11:21:38 浏览69 评论0

摘要： 函数计算是一个事件驱动的全托管计算服务。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，这就给用户极大的自由来实现自定义的功能，一旦和自定义自动化运维相遇，会擦出不一样的火花

什么是函数计算

阿里云函数计算是一个事件驱动的全托管计算服务。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。

函数计算遇见自动化运维

函数计算给用户极大的自由来实现自定义的功能，一旦和自定义自动化运维相遇，会擦出不一样的火花

示例场景1

某些账号ak需要定期更换，以确保ak安全

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

示例具体实现

定期更换ak，函数计算结合定时器

创建函数,函数创建可参考函数计算helloworld
给函数配置定时器，详情可参考定时触发函数
核心代码，可去附件下载完整代码

# -*- 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 = "NmQyY2ZhODMtMTlhYS00MTNjLTlmZjAtZTQxYTFiYWVmMzZmM1B1NXhTZENCNXVWd1dhdTNMWVRvb3V6dU9QcVVlMXRBQUFBQUFBQUFBQ3gwZTkzeGhDdHVzMWhDUCtZeVVuMWlobzlCa3VxMlErOXFHWWdZMSt1MkdZYlgwL1NSZTFvUURYSW9lak5Hak1lMnF0R2I1TWUxMEJiYmkzVnBwZHlrWGYzc3kyK2tQbGlKb2lHQ3lrZUdieHN2eXZwSVYzN2Qyd1cydz09"

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)

定期检查ecs对外暴露端口，函数计算结合定时器

过程如上一下函数操作过程

核心代码片段

# -*- 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)

附件下载： code.zip[rsong].1523503335.zip