Using ansibler gem to share Ansible inventory file with Vagrant https://github.com/aisrael/ansibler

vagrant

web1   ansible_host=192.168.4.11 ansible_ssh_user='vagrant' ansible_ssh_private_key_file='/Users/wojtha/.vagrant.d/insecure_private_key'
mongo1 ansible_host=192.168.4.21 ansible_ssh_user='vagrant' ansible_ssh_private_key_file='/Users/wojtha/.vagrant.d/insecure_private_key'
redis1 ansible_host=192.168.4.31 ansible_ssh_user='vagrant' ansible_ssh_private_key_file='/Users/wojtha/.vagrant.d/insecure_private_key'

[mongo]
mongo1

[redis]
redis1

[web]
web1

Vagrantfile

Vagrant.configure("2") do |config|
  # Base VM OS configuration.
  config.vm.box = "geerlingguy/ubuntu1404"
  config.vm.synced_folder '.', '/vagrant', disabled: true
  config.ssh.insert_key = false

  config.vm.provider :virtualbox do |v|
    v.memory = 256
    v.cpus = 1
    v.linked_clone = true
  end
  
  unless defined? Ansible::Inventory
    fail "Missing `ansibler` plugin. Please run `vagrant plugin install ansibler` and try again"
  end

  inventory = Ansible::Inventory.read_file('inventories/vagrant')

  config.vm.provision "ansible" do |ansible|
    ansible.playbook = "configure.yml"
    ansible.groups = inventory.groups.each_with_object({}) { |group, acc| acc[group.name] = group.hosts.map(&:name) }
  end

  inventory.hosts.each do |host|
    config.vm.define host.name do |machine|
      machine.vm.network :private_network, ip: host.vars[:ansible_host]
    end
  end
end