pecl install apc

make sure that the apxs directory is in the system path.

slowloris ddos aversion

use Nginx and openBSD/pf to protect Apache.
http://nginx.net/

here's some configuration help.
https://calomel.org/nginx.html

Slowloris DDOS prevention

#!/bin/sh

LIMIT=100

COMMAND='netstat -n | egrep '\''tcp.*[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*:(80|443)[ ]*[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*:[0-9]*[ ]*ESTABLISHED
'\'' | awk -F'\''[ \t:]+'\'' '\''{ print $6 }'\'''

eval $COMMAND | sort | uniq -c | while read numconn ip
do
if [ $numconn -gt $LIMIT ]
then
echo "Check ASAP and renable this cron." | mail -s "IP $ip - ($numconn) went over $LIMIT connections on `hostname`" me@someemailaddress.com

sed -i 's/\(^\*.*this_script.sh*\)/#\1/g' /etc/crontab
# /sbin/iptables -I INPUT -s $ip -j DROP
fi
done

Apache Worker vs. Prefork

This is a good post.

http://www.camelrichard.org/apache-prefork-vs-worker

Good Hints:
Worker is superior in 2+ cpu applications
Compile PHP5 after installing Apache

How to set up Apache, MySQL and PHP on FreeBSD

# cd /usr/ports/www/apache13-modssl
# make install
# echo 'apache_enable ="YES"' >> /etc/rc.conf
# echo 'apache_flags ="-DSSL"' >> /etc/rc.conf
# echo 'mysql_enable ="YES"' >> /etc/rc.conf
# /usr/local/etc/rc.d/mysql-server start
# mysqladmin -u root password newpassword
# cd /usr/ports/www/mod_php4
# make install clean
# cd /usr/ports/lang/php4-extensions
# make install clean
# vi /usr/local/etc/apache/httpd.conf
AddType application/x- httpd-php . php
AddType application/x- httpd-php-source . phps
# /usr/local/etc/rc.d/apache.sh start


# whoami
root
# cd ~
# openssl genrsa -des3 -out server.key 1024
# openssl req -new -key server.key -out server.csr 
# openssl x509 -req -days 365 \
     -in /root/server.csr \
     -signkey /root/server.key \
     -out /root/server.crt
# cp ~/ ./server.key /usr/local/etc/apache/ssl.key/
# cp ~/ ./server.crt /usr/local/etc/apache/ssl.crt/