Example of running multiple VM's using a single Vagrantfile.

Vagrantfile.rb

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant::Config.run do |config|
  config.vm.box = "base"
  config.vm.customize ["modifyvm", :id, "--memory", 1024]

  config.vm.define :haproxy do |haproxy|
    haproxy.vm.forward_port 80, 8000
    haproxy.vm.network :hostonly, "192.168.1.10"
  end

  config.vm.define :appserver1 do |app|
    app.vm.forward_port 80, 8001
    app.vm.network :hostonly, "192.168.1.11"
  end

  config.vm.define :appserver2 do |app|
    app.vm.forward_port 80, 8002
    app.vm.network :hostonly, "192.168.1.12"
  end

  config.vm.define :appserver3 do |app|
    app.vm.forward_port 80, 8003
    app.vm.network :hostonly, "192.168.1.13"
  end

  config.vm.define :db do |db|
    # db.vm.forward_port xxx, xxxx
    db.vm.network :hostonly, "192.168.1.14"
  end
end