You could also look at the nginx module naxsi :
https://github.com/nbs-system/naxsi

More flexibility with regex and actions

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On Mon, Nov 14, 2016 at 10:04 AM, debilish99 <nginx-forum@forum.nginx.org>
wrote:

> Hello,
>
> I have a server with several domains, in the configuration file of each
> domain I have a line like this to block bad bots.
>
> If ($ http_user_agent ~ *
> (zealbot|MJ12bot|AhrefsBot|sogou|PaperLiBot|uipbot|
> DotBot|GetIntent|Cliqzbot|YandexBot|Nutch|TurnitinBot|IndeedBot)
> Return 403;
> }
>
> This works fine.
>
> The question is, if I increase the list of bad bots to 1000, for example,
> this would be a speed problem when nginx manages every request that
> arrives.
>
> I have domains that can have 500,000 hits daily and up to 20,000 hits.
>
> Thank you all.
>
> Greetings.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.
> php?2,270930,270930#msg-270930
>
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