I am pretty new to the scenario of LAMP. I am trying to create a multiple server lamp stack i.e. 3 linux servers with one of A,M,P (Linux+ Apache, Linux + Mysql, Linux + php)

I have my basic environment ready with 3 linux servers having A,M,P respectively. But I am having troubles integrating the 3 (A,M,P) to communicate with each other. Has anyone tried one such scenario. Or any guidelines for the same. Searched on the net but couldnt find any. These are the steps I followed. I am missing the steps to integrate all the 3. Please guide

server1:

yum install -y httpd
/sbin/service httpd restart

server2:

yum install -y mysql-libs
yum install -y mysql
yum install -y perl-DBI
yum install -y perl-DBD-MySQL
yum install -y mysql-server
/sbin/chkconfig mysqld on
/sbin/service mysqld start
mysql -u root  -e "CREATE USER 'mysqluser' IDENTIFIED by 'password'"
mysql -u root  -e "CREATE USER 'mysqluser'@'localhost' IDENTIFIED by 'password'"
mysql -u root  -e "GRANT ALL PRIVILEGES ON *.* TO 'mysqluser'@'localhost' WITH GRANT OPTION"
mysql -u root  -e "GRANT ALL PRIVILEGES ON *.* TO 'mysqluser'@'%' WITH GRANT OPTION"
mysql -u mysqluser -p password -e "CREATE DATABASE mysqldb" 
mysql -u mysqluser -p password mysqldb < /tmp/mysqlinstaller/world.sql

server 3:

yum install -y php php-mysql
sed -i "s/Listen 80/#Listen 80/g" /etc/httpd/conf/httpd.conf
yum install -y mod_ssl openssl
/sbin/service httpd restart