Vagrant dynamic port mapping

mappings.yml

---

- mapping: '80:8082'
  role: nil

- mapping: '53:5350/udp,53:5350,8081'
  role: 'powerdns'

- mapping: '2003,4444/udp,9200,9300'
  role: 'logging'

- mapping: '4000,4560,5000'
  role: 'metrics'

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :
require 'yaml'

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

# Load mappings.yml
MAPPINGS = YAML.load_file('mappings.yml')

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  MAPPINGS.each do |maps|
    maps["mapping"].split(/,/).each do |mapping|
      guest, host = mapping.split(/:/)
      host, protocol = (host || guest).to_s.split(/\//)
      config.vm.network :forwarded_port, guest: guest.gsub(/\/.*/, ''), host: (host || guest), protocol: (protocol || "tcp")
    end
  end

end

I recommend checking in a mappings.example.yml and adding mappings.yml to your .gitignore.