serf.yaml

- hosts: serf

  tasks:
    - name: creating required directories
      file: path={{ item }} state=directory
      with_items:
        - ~/tmp
        - ~/bin

    - name: fetching serf binary
      get_url: dest=~/tmp/serf.zip url=https://dl.bintray.com/mitchellh/serf/0.1.1_linux_amd64.zip 
  
    - name: extracting serf archive
      shell: chdir=~/tmp creates=~/bin/serf unzip serf.zip -d ~/bin

    - name: adding ~/bin to user path
      lineinfile: regexp='PATH=\\$HOME/bin' line='export PATH=\$HOME/bin:\$PATH' dest=~/.bashrc

Vagrantfile

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

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

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.define :serf do |config|
    config.vm.box = "precise64"
    config.vm.box_url = "http://files.vagrantup.com/precise64.box"

    config.vm.provision :ansible do |ansible|
      ansible.playbook = "serf.yaml"
    end
  end
end