add vagrant playground

vagrant/Vagrantfile

@@ -0,0 +1,53 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+
+  config.trigger.before :up do |trigger|
+      trigger.run = {inline: "cp -uvf ../../../../../bin/coredns ../../../../../bin/wgsd-client ."}
+  end
+
+  config.vm.box = "ubuntu/focal64"
+
+  config.vm.synced_folder ".", "/vagrant", type: "rsync"
+
+  config.vm.provision "shell", inline: <<-SHELL
+    apt-get -y update
+    apt-get -y install wireguard
+  SHELL
+
+  config.vm.define "registry" do |registry|
+    registry.vm.hostname = "registry"
+    registry.vm.network "private_network", ip: "192.168.33.10"
+    registry.vm.provision "shell", inline: <<-SHELL
+      wg genkey | tee /etc/wireguard/privatekey | wg pubkey | tee /etc/wireguard/publickey
+      cat > /etc/wireguard/wg0.conf << EOF
+[Interface]
+PrivateKey = $(cat /etc/wireguard/privatekey)
+Address = 192.168.100.10/24
+SaveConfig = True
+ListenPort = 51820
+EOF
+      chmod 600 /etc/wireguard/{privatekey,wg0.conf}
+      chmod 644 /etc/wireguard/publickey
+      chmod 711 /etc/wireguard
+      systemctl enable wg-quick@wg0
+      systemctl start wg-quick@wg0
+      cat > /etc/rc.local << EOF
+#!/bin/sh
+/vagrant/coredns -conf /vagrant/Corefile | logger &
+EOF
+      chmod 755 /etc/rc.local
+      sleep 1
+      /etc/rc.local
+    SHELL
+  end
+
+  (1..4).each do |i|
+      config.vm.define "client-#{i}" do |client|
+          client.vm.hostname = "client-#{i}"
+          client.vm.network "private_network", ip: "192.168.33.10#{i}"
+      end
+  end
+
+end