目前除了我们常见的搜索引擎如百度、Google、Sogou、360等搜索引擎之外，还存在其他非常多的搜索引擎，通常这些搜索引擎不仅不会带来流量，因为大量的抓取请求，还会造成主机的CPU和带宽资源浪费，屏蔽方法也很简单，按照下面步骤操作即可，原理就是分析指定UA然后屏蔽。

总结来说就是两种，一种是通过robots.txt处理，但是这个需要蜘蛛遵守robots协议，据说有的垃圾蜘蛛不遵守robots协议，所以这个感觉不是太保险，另一种就是在服务器设置禁止这些蜘蛛访问。

方法一 通过网站Robots.txt来屏蔽

User-agent: AhrefsBot
Disallow: /
User-agent: DotBot
Disallow: /
User-agent: SemrushBot
Disallow: /
User-agent: Uptimebot
Disallow: /
User-agent: MJ12bot
Disallow: /
User-agent: MegaIndex.ru
Disallow: /
User-agent: ZoominfoBot
Disallow: /
User-agent: Mail.Ru
Disallow: /
User-agent: SeznamBot
Disallow: /
User-agent: BLEXBot
Disallow: /
User-agent: ExtLinksBot
Disallow: /
User-agent: aiHitBot
Disallow: /
User-agent: Researchscan
Disallow: /
User-agent: DnyzBot
Disallow: /
User-agent: spbot
Disallow: /
User-agent: YandexBot
Disallow: /

把以上代码复制到网站robots.txt里面

方法二、通过宝塔面板配置文件判断来屏蔽垃圾蜘蛛和扫描工具

首先进入宝塔面板，文件管理进入/www/server/nginx/conf目录，新建空白文件kill_bot.conf。然后将以下代码保存到当前文件中。

#禁止垃圾搜索引擎蜘蛛抓取

if ($http_user_agent ~* "CheckMarkNetwork|Synapse|Nimbostratus-Bot|Dark|scraper|LMAO|Hakai|Gemini|Wappalyzer|masscan|crawler4j|Mappy|Center|eright|aiohttp|MauiBot|Crawler|researchscan|Dispatch|AlphaBot|Census|ips-agent|NetcraftSurveyAgent|ToutiaoSpider|EasyHttp|Iframely|sysscan|fasthttp|muhstik|DeuSu|mstshash|HTTP_Request|ExtLinksBot|package|SafeDNSBot|CPython|SiteExplorer|SSH|MegaIndex|BUbiNG|CCBot|NetTrack|Digincore|aiHitBot|SurdotlyBot|null|SemrushBot|Test|Copied|ltx71|Nmap|DotBot|AdsBot|InetURL|Pcore-HTTP|PocketParser|Wotbox|newspaper|DnyzBot|redback|PiplBot|SMTBot|WinHTTP|Auto Spider 1.0|GrabNet|TurnitinBot|Go-Ahead-Got-It|Download Demon|Go!Zilla|GetWeb!|GetRight|libwww-perl|Cliqzbot|MailChimp|SMTBot|Dataprovider|XoviBot|linkdexbot|SeznamBot|Qwantify|spbot|evc-batch|zgrab|Go-http-client|FeedDemon|JikeSpider|Indy Library|Alexa Toolbar|AskTbFXTV|AhrefsBot|CrawlDaddy|CoolpadWebkit|Java|UniversalFeedParser|ApacheBench|Microsoft URL Control|Swiftbot|ZmEu|jaunty|Python-urllib|lightDeckReports Bot|YYSpider|DigExt|YisouSpider|HttpClient|MJ12bot|EasouSpider|LinkpadBot|Ezooms") {
 return 403;
 break;
}

#禁止扫描工具客户端
if ($http_user_agent ~* "crawl|curb|git|Wtrace|Scrapy" ) {
 return 403;
 break;
}

保存后返回到宝塔 – 【网站】-【设置】点击左侧 【配置文件】选项卡。在 “#SSL-START SSL相关配置，请勿删除或修改下一行带注释的404规则” 上方空白行插入代码：“include kill_bot.conf; ” 保存后即可生效，这样这些蜘蛛或工具扫描网站的时候就会提示403禁止访问。