My working minimalist Vagrantfile with everything I have used so far in my use of Vagrant

Vagrantfile

VAGRANTFILE_CLIENT_NAME = "example"

Vagrant.configure(2) do |config|

  config.vm.define VAGRANTFILE_CLIENT_NAME do |localdevbox|
    localdevbox.vm.box = "localdev"

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine. In the example below,
  # accessing "localhost:8080" will access port 80 on the guest machine.
    localdevbox.vm.network "forwarded_port", guest: 80, host: 8080

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  # localdevbox.vm.network "private_network", ip: "192.168.33.10"

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  # localdevbox.vm.network "public_network"

    localdevbox.vm.synced_folder ".", "/var/www", :owner=> 'vagrant', :group=>'www-data', :mount_options => ['dmode=775', 'fmode=775']
  end

  config.vm.provider "virtualbox" do |vb|
    vb.name = VAGRANTFILE_CLIENT_NAME

    # Tell vagrant to use the host computer as resolver
    #  vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]

    # Display the VirtualBox GUI when booting the machine
    #  vb.gui = true

    # Customize the amount of memory on the VM:
    #  vb.memory = "1024"
  end

  #config.vm.provision "shell", inline: "sudo apt-get update && sudo apt-get upgrade -y"

end