Ubuntu 12.04 Precise LTS: Install ModEvasive for Apache 2 web server

1. sudo apt-get install libapache2-mod-evasive

2. sudo mkdir /var/log/mod_evasive; sudo chown -R www-data:www-data /var/log/mod_evasive

3. sudo vi /etc/apache2/mods-available/mod-evasive.conf

   <ifmodule mod_evasive20.c>
      DOSHashTableSize 3097
      DOSPageCount  2
      DOSSiteCount  50
      DOSPageInterval 1
      DOSSiteInterval  1
      DOSBlockingPeriod  10
      DOSLogDir   /var/log/mod_evasive
      DOSEmailNotify  EMAIL@DOMAIN.com
      DOSWhitelist   127.0.0.1
   </ifmodule>

4. sudo a2enmod mod-evasive; sudo /etc/init.d/apache2 restart