Apache

Install mod-evasive

sudo apt install libapache2-mod-evasive

Add mod_evasive to VirtualHost

<IfModule mod_evasive20.c>
    DOSHashTableSize 3097
    DOSPageCount 2
    DOSSiteCount 60
    DOSPageInterval 1
    DOSSiteInterval 1
    DOSBlockingPeriod 60
    DOSEmailNotify <hyperreal@moonshadow.dev
</IfModule>

Restart apache2.

sudo systemctl restart apache2.service