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my site is constantly visited by bots and very often I would like to block them

because of them, the load on php-fpm

enter image description here

on log apache files i have this

enter image description here

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In your .htaccess you can add restrictions rules to avoid those bots of access your website. Below there is a list of known ones. Your case is the first in the list.

RewriteEngine On 
RewriteCond %{HTTP_USER_AGENT} ^DotBot [OR] 
RewriteCond %{HTTP_USER_AGENT} ^BlackWidow [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Bot\ mailto:craftbot@yahoo.com [OR] 
RewriteCond %{HTTP_USER_AGENT} ^ChinaClaw [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Custo [OR] 
RewriteCond %{HTTP_USER_AGENT} ^DISCo [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Download\ Demon [OR] 
RewriteCond %{HTTP_USER_AGENT} ^eCatch [OR] 
RewriteCond %{HTTP_USER_AGENT} ^EirGrabber [OR] 
RewriteCond %{HTTP_USER_AGENT} ^EmailSiphon [OR] 
RewriteCond %{HTTP_USER_AGENT} ^EmailWolf [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Express\ WebPictures [OR] 
RewriteCond %{HTTP_USER_AGENT} ^ExtractorPro [OR] 
RewriteCond %{HTTP_USER_AGENT} ^EyeNetIE [OR] 
RewriteCond %{HTTP_USER_AGENT} ^FlashGet [OR] 
RewriteCond %{HTTP_USER_AGENT} ^GetRight [OR] 
RewriteCond %{HTTP_USER_AGENT} ^GetWeb! [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Go!Zilla [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Go-Ahead-Got-It [OR] 
RewriteCond %{HTTP_USER_AGENT} ^GrabNet [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Grafula [OR] 
RewriteCond %{HTTP_USER_AGENT} ^HMView [OR] 
RewriteCond %{HTTP_USER_AGENT} HTTrack [NC,OR] 
RewriteCond %{HTTP_USER_AGENT} ^Image\ Stripper [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Image\ Sucker [OR] 
RewriteCond %{HTTP_USER_AGENT} Indy\ Library [NC,OR] 
RewriteCond %{HTTP_USER_AGENT} ^InterGET [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Internet\ Ninja [OR] 
RewriteCond %{HTTP_USER_AGENT} ^JetCar [OR]  
RewriteCond %{HTTP_USER_AGENT} ^JOC\ Web\ Spider [OR] 
RewriteCond %{HTTP_USER_AGENT} ^larbin [OR] 
RewriteCond %{HTTP_USER_AGENT} ^LeechFTP [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Mass\ Downloader [OR] 
RewriteCond %{HTTP_USER_AGENT} ^MIDown\ tool [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Mister\ PiX [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Navroad [OR] 
RewriteCond %{HTTP_USER_AGENT} ^NearSite [OR] 
RewriteCond %{HTTP_USER_AGENT} ^NetAnts [OR] 
RewriteCond %{HTTP_USER_AGENT} ^NetSpider [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Net\ Vampire [OR] 
RewriteCond %{HTTP_USER_AGENT} ^NetZIP [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Octopus [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Offline\ Explorer [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Offline\ Navigator [OR] 
RewriteCond %{HTTP_USER_AGENT} ^PageGrabber [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Papa\ Foto [OR] 
RewriteCond %{HTTP_USER_AGENT} ^pavuk [OR] 
RewriteCond %{HTTP_USER_AGENT} ^pcBrowser [OR] 
RewriteCond %{HTTP_USER_AGENT} ^RealDownload [OR] 
RewriteCond %{HTTP_USER_AGENT} ^ReGet [OR] 
RewriteCond %{HTTP_USER_AGENT} ^SiteSnagger [OR] 
RewriteCond %{HTTP_USER_AGENT} ^SmartDownload [OR] 
RewriteCond %{HTTP_USER_AGENT} ^SuperBot [OR] 
RewriteCond %{HTTP_USER_AGENT} ^SuperHTTP [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Surfbot [OR] 
RewriteCond %{HTTP_USER_AGENT} ^tAkeOut [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Teleport\ Pro [OR] 
RewriteCond %{HTTP_USER_AGENT} ^VoidEYE [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Web\ Image\ Collector [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Web\ Sucker [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebAuto [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebCopier [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebFetch [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebGo\ IS [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebLeacher [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebReaper [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebSauger [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Website\ eXtractor [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Website\ Quester [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebStripper [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebWhacker [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WebZIP [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Wget [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Widow [OR] 
RewriteCond %{HTTP_USER_AGENT} ^WWWOFFLE [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Xaldon\ WebSpider [OR] 
RewriteCond %{HTTP_USER_AGENT} ^Zeus 
RewriteRule ^.* - [F,L]
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0

How to use .htaccess to block / deny visitors via their URL or IP address:

Block by URL specific to your question:

Note that the pattern in the rule itself doesn't lead with a / because for the rule it is stripped off but for %{REQUEST_URI} pattern it is preserved. See https://stackoverflow.com/a/18178775/8826818

RewriteRule ^dotbot$ - [F]

Add the code to your site's root .htaccess file.

Block by IP address:

Change the IP address to the one that you want to block and add the code to your site's root .htaccess file.

Deny from 123.123.123.123
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