Dockerfile

FROM ubuntu:14.04

RUN apt-get -y update
RUN apt-get -y install nginx
ADD example.conf /etc/nginx/conf.d/example.conf
RUN echo "daemon off;" >>/etc/nginx/nginx.conf

EXPOSE 3000

CMD ["/usr/sbin/nginx"]

example.conf

server {
  listen 80;
  root /var/www/nginx;
  try_files $uri/index.html $uri.html $uri @app;

  location @app {
    proxy_pass http://foobar;
  }
}

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.box = "ubuntu/trusty64"
  config.vm.box_check_update = false

  config.vm.provision :shell, inline: <<EOS
    set -e

    # install docker
    curl -sSL https://get.docker.io/ubuntu/ | sudo sh

    # upgrade to 1.3.0 (testing)
    curl -q -s -o /usr/bin/docker-1.3.0 https://test.docker.com/builds/Linux/x86_64/docker-1.3.0
    chmod a+x /usr/bin/docker-1.3.0
    mv /usr/bin/docker /usr/bin/docker-1.2.0
    ln -s /usr/bin/docker-1.3.0 /usr/bin/docker
    restart docker
    sleep 3
    docker version

    # add vagrant to docker group
    gpasswd -a vagrant docker

    # build image
    su - vagrant -c 'cd /vagrant && docker build -t test .'
EOS
end