Learn VAGRANTFILE with Real Code Examples

# vagrant/demo/Vagrantfile
Vagrant.configure("2") do |config|
    config.vm.box = "ubuntu/focal64"
    config.vm.network "forwarded_port", guest: 80, host: 8080
    config.vm.provider "virtualbox" do |vb|
        vb.memory = "1024"
    end
end

A simple Vagrantfile to create a single Ubuntu VM with forwarded port 8080.