Install ansible

http://docs.ansible.com/intro_installation.html#installation

Add a user with username "deploy"

ansible-playbook user.yml -i stage

Install Nginx webserver

ansible-playbook webservers.yml -i stage

Install Mysql

ansible-playbook dbservers.yml -t mysql -i stage

Install Postgresql

ansible-playbook dbservers.yml -t postgres -i stage

Install Rbenv + Ruby + Nodejs

ansible-playbook appservers.yml -i stage