Update Vagrantfile, add servers.yml

Add servers.yml for VM configuration details. Update Vagrantfile to
reference servers.yml for configuration. Add more comments to
Vagrantfile.

photon/Vagrantfile

@@ -5,18 +5,42 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 
+# Require 'yaml' module
+require 'yaml'
+
+# Read YAML file to get VM configuration information
+# Edit servers.yml to change VM configuration details
+servers = YAML.load_file('servers.yml')
+
 # Create and configure the VMs
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 
-  # Specify the Vagrant box to use
-  config.vm.box = "vmware/photon"
-
-  # Disable automatic box update checking
-  config.vm.box_check_update = false
-
   # Use Vagrant's default insecure SSH key
   config.ssh.insert_key = false
 
-  # Disable default synced folder
-  config.vm.synced_folder ".", "/vagrant", disabled: true
-end
+  # Iterate through entries in YAML file to create VMs
+  servers.each do |servers|
+
+    # Configure the VMs per details in servers.yml
+    config.vm.define servers["name"] do |srv|
+
+      # Don't check for box updates
+      srv.vm.box_check_update = false
+
+      # Specify the hostname of the VM
+      srv.vm.hostname = servers["name"]
+
+      # Specify the Vagrant box to use
+      srv.vm.box = servers["box"]
+
+      # Disable default synced folder (not supported with Photon)
+      srv.vm.synced_folder ".", "/vagrant", disabled: true
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml
+      srv.vm.provider :vmware_fusion do |vmw|
+        vmw.vmx["memsize"] = servers["ram"]
+        vmw.vmx["numvcpus"] = servers["vcpu"]
+      end # srv.vm.provider
+    end # config.vm.define
+  end # servers.each
+end # Vagrant.configure

photon/servers.yml

@@ -1,5 +1,5 @@
 ---
-- name: openstack-cli
-  box: slowe/ubuntu-trusty-x64
+- name: photon-01
+  box: vmware/photon
   ram: 512
   vcpu: 1