Create one master and two nodes with Debian to play around with Docker swarm mode.

Vagrantfile

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

# https://manski.net/2016/09/vagrant-multi-machine-tutorial/

BOX_IMAGE = "bento/debian-9"
NODE_COUNT = 2

Vagrant.configure("2") do |config|
  config.vm.define "master" do |subconfig|
    subconfig.vm.box = BOX_IMAGE
    subconfig.vm.hostname = "master"
    subconfig.vm.network :private_network, ip: "10.0.0.10"
  end

  (1..NODE_COUNT).each do |i|
    config.vm.define "node#{i}" do |subconfig|
      subconfig.vm.box = BOX_IMAGE
      subconfig.vm.hostname = "node#{i}"
      subconfig.vm.network :private_network, ip: "10.0.0.#{i + 10}"
    end
  end

  config.vm.provision "shell", inline: <<-SHELL
    apt-get update
    apt-get upgrade -y
    apt-get install -y \
        avahi-daemon \
        libnss-mdns \
        apt-transport-https \
        ca-certificates \
        curl \
        gnupg2 \
        software-properties-common \
        tmux \
        git
    curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
    add-apt-repository \
        "deb [arch=amd64] https://download.docker.com/linux/debian \
        $(lsb_release -cs) \
        stable"
    apt-get update
    apt-get install -y \
        docker-ce \
        docker-ce-cli \
        containerd.io
  SHELL
end