Установка nginx
Репозитарии:

64bit
rpm -ihv http://centos.alt.ru/repository/centos/5/x86_64/centalt-release-5-3.noarch.rpm
rpm -Uvh http://download.fedora.redhat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm
32bit
rpm -ihv http://centos.alt.ru/repository/centos/5/i386/centalt-release-5-3.noarch.rpm
rpm -Uvh http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm

yum install nginx

Установка php

yum install php

Установка spawn-fcgi

yum install spawn-fcgi

в /etc/init.d/ создаем файл php_cgi
с содержанием

#!/bin/sh
#
# php-cgi - php-fastcgi swaping via spawn-fcgi
#
# chkconfig: - 85 15
# description: Run php-cgi as app server
# processname: php-cgi
# config: /etc/sysconfig/phpfastcgi (defaults RH style)
# pidfile: /var/run/php_cgi.pid
# Note: See how to use this script :
# http://www.cyberciti.biz/faq/rhel-fedora-install-configure-nginx-php5/
# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

spawnfcgi="/usr/bin/spawn-fcgi"
php_cgi="/usr/bin/php-cgi"
prog=$(basename $php_cgi)
server_ip=127.0.0.1
server_port=9000
server_user=apache
server_group=apache
server_childs=5
pidfile="/var/run/php_cgi.pid"

# do not edit, put changes in /etc/sysconfig/phpfastcgi
[ -f /etc/sysconfig/phpfastcgi ] && . /etc/sysconfig/phpfastcgi

start() {
[ -x $php_cgi ] || exit 1
[ -x $spawnfcgi ] || exit 2
echo -n $"Starting $prog: "
daemon $spawnfcgi -a ${server_ip} -p ${server_port} -u ${server_user} -g ${server_group} -P ${pidfile} -C ${server_childs} -f ${php_cgi}
retval=$?
echo
return $retval
}

stop() {
echo -n $"Stopping $prog: "
killproc -p ${pidfile} $prog -QUIT
retval=$?
echo
[ -f ${pidfile} ] && /bin/rm -f ${pidfile}
return $retval
}

restart(){
stop
sleep 2
start
}

rh_status(){
status -p ${pidfile} $prog
}

case "$1" in
start)
start;;
stop)
stop;;
restart)
restart;;
status)
rh_status;;
*)
echo $"Usage: $0 {start|stop|restart|status}"
exit 3
esac

Ставим права

chmod a+x /etc/init.d/php_cgi

запускаем

service php_cgi start

можете настраивать дальше.