ман для apache.txt

sudo apt-get update
sudo apt-get install apache2 apache2-doc apache2-mpm-prefork apache2-utils apache2-suexec
sudo apt-get install php5 php-doc php-pear libapache2-mod-php5 libapache2-mod-auth-mysql libapache2-mod-ruby php5-mysql libapache2-mod-python php5-dev php5-cgi php5-mcrypt php5-gd php5-cli php5-common php5-curl php5-idn php5-imagick php5-imap php5-memcache php5-ming php5-ps php5-pspell php5-recode php5-snmp php5-sqlite php5-tidy php5-xmlrpc php5-xsl
sudo apt-get install libpng12-dev libjpeg62-dev libxpm-dev libfreetype6-dev

Çàùèùàåì Apache îò DDoS àòàê.
sudo apt-get install libapache2-mod-evasive
sudo nano /etc/apache2/mods-available/mod-evasive.conf
 í¸ì ïèøåì!
<IfModule mod_evasive20.c>
DOSHashTableSize 4096
DOSPageCount 5
DOSSiteCount 50
DOSPageInterval 1
DOSSiteInterval 1
DOSBlockingPeriod 10
</IfModule>

sudo nano /etc/apache2/sites-available/default
Èçìåíÿåì ïàðàìåòð: AllowOverride None íà AllowOverride All

sudo /etc/init.d/apache2 restart

http://ipdemon.ru/2011/12/mod_evasive_debian/
http://habrahabr.ru/post/145215/
http://wiki.vdsplanet.ru/%D0%97%D0%B0%D1%89%D0%B8%D1%82%D0%B0_%D0%BE%D1%82_%D0%BB%D0%B5%D0%B3%D0%BA%D0%BE%D0%B9_flood_%D0%B8_ddos_%D0%B0%D1%82%D0%B0%D0%BA%D0%B8_%D0%BF%D0%BE_HTTP-%D0%BF%D1%80%D0%BE%D1%82%D0%BE%D0%BA%D0%BE%D0%BB%D1%83_%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D1%83%D1%8F_mod_dosevasive

http://www.ubuntomania.ru/servery/web/440-zashhita-apache-ot-ddos-atak.html