This is working version with completed documentation

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+vms = {
+  'node1' => {'memory' => '4096', 'cpus' => 2, 'ip' => '20', 'host' => 'node1', 'provision' => 'node.sh'},
+  'node2' => {'memory' => '4096', 'cpus' => 2, 'ip' => '30', 'host' => 'node2', 'provision' => 'node.sh'},
+  'extras' => {'memory' => '256', 'cpus' => 1, 'ip' => '40', 'host' => 'extras', 'provision' => 'extras.sh'},
+  'master' => {'memory' => '8192', 'cpus' => 4, 'ip' => '10', 'host' => 'okd', 'provision' => 'master.sh'}
+}
+
+Vagrant.configure('2') do |config|
+
+  config.vm.box = 'centos/7'
+  config.vm.box_check_update = false
+
+  vms.each do |name, conf|
+    config.vm.define "#{name}" do |k|
+      k.vm.hostname = "#{conf['host']}.example.com"
+      k.vm.network 'private_network', ip: "172.27.11.#{conf['ip']}"
+      k.vm.provider 'virtualbox' do |vb|
+        vb.memory = conf['memory']
+        vb.cpus = conf['cpus']
+      end
+      k.vm.provider 'libvirt' do |lv|
+        lv.memory = conf['memory']
+        lv.cpus = conf['cpus']
+        lv.cputopology :sockets => 1, :cores => conf['cpus'], :threads => '1'
+      end
+      k.vm.provision 'shell', path: "provision/#{conf['provision']}"
+    end
+  end
+
+  config.vm.provision 'shell', path: 'provision/provision.sh'
+end