diff --git a/docker-swarm-etcd/Vagrantfile b/docker-swarm-etcd/Vagrantfile
index 964f6e7..3229168 100644
--- a/docker-swarm-etcd/Vagrantfile
+++ b/docker-swarm-etcd/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml', 'fileutils', and 'erb' modules
 require 'yaml'
@@ -52,6 +54,7 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
       srv.vm.box = servers["box"]
       # Assign an additional static private network
       srv.vm.network "private_network", ip: servers["priv_ip"]
+
       # Configure VMs based on CoreOS box
       if srv.vm.box == "coreos-stable"
         # Disable default synced folder for CoreOS VMs
@@ -60,7 +63,8 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
         srv.vm.provision "file", source: "#{USER_DATA}", destination: "/tmp/vagrantfile-user-data"
         # Move user_data to correct location to be processed by cloud-init
         srv.vm.provision "shell", inline: "mv /tmp/vagrantfile-user-data /var/lib/coreos-vagrant/", privileged: true
-      end
+      end # if srv.vm.box
+
       # Configure VMs based on Ubuntu box
       if srv.vm.box == "slowe/ubuntu-trusty-x64"
         # Enable default synced folder (needed for provisioning)
@@ -68,12 +72,19 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
         # Run final provisioning script
         # Note that default shared folder is needed for script to work
         srv.vm.provision "shell", path: "provision.sh", privileged: true
-      end
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+      end # if srv.vm.box
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx["memsize"] = servers["ram"]
         vmw.vmx["numvcpus"] = servers["vcpu"]
-      end
-    end
-  end
-end
\ No newline at end of file
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = servers["ram"]
+        vb.cpus = servers["vcpu"]
+      end # srv.vm.provider virtualbox
+    end # config.vm.define
+  end # servers.each
+end # Vagrant.configure
diff --git a/docker-swarm/Vagrantfile b/docker-swarm/Vagrantfile
index c4ef23c..2cd188e 100644
--- a/docker-swarm/Vagrantfile
+++ b/docker-swarm/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version '>= 1.6.0'
 VAGRANTFILE_API_VERSION = '2'
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml', 'fileutils', and 'erb' modules
 require 'yaml'
@@ -74,11 +76,17 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
         srv.vm.provision 'shell', path: 'consul.sh'
       end # srv.vm.box == 'ubuntu-trusty-x64'
 
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx['memsize'] = server['ram']
         vmw.vmx['numvcpus'] = server['vcpu']
-      end # srv.vm.provider
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = server['ram']
+        vb.cpus = server['vcpu']
+      end # srv.vm.provider virtualbox
     end # config.vm.define
   end # servers.each
 end # Vagrant.configure
diff --git a/etcd-2.0/Vagrantfile b/etcd-2.0/Vagrantfile
index bea9a19..bf39e5f 100644
--- a/etcd-2.0/Vagrantfile
+++ b/etcd-2.0/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml' module
 require 'yaml'
@@ -39,22 +41,33 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   # Iterate through entries in YAML file to create VMs
   servers.each do |servers|
     config.vm.define servers["name"] do |srv|
+
       # Don't check for box updates
       srv.vm.box_check_update = false
       srv.vm.hostname = servers["name"]
       srv.vm.box = servers["box"]
+
       # Assign an additional static private network
       srv.vm.network "private_network", ip: servers["priv_ip"]
+
       # Specify default synced folder; requires VMware Tools
       # Note shared folders are REQUIRED for the shell provisioning to work
       srv.vm.synced_folder ".", "/vagrant"
+
       # Provision etcd to the VMs
       srv.vm.provision "shell", path: "provision.sh", privileged: true
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx["memsize"] = servers["ram"]
         vmw.vmx["numvcpus"] = servers["vcpu"]
-      end
-    end
-  end
-end
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = servers["ram"]
+        vb.cpus = servers["vcpu"]
+      end # srv.vm.provider virtualbox
+    end # config.vm.define
+  end # servers.each
+end # Vagrant.configure
diff --git a/lxd-ovs/Vagrantfile b/lxd-ovs/Vagrantfile
index 6734284..7511e63 100644
--- a/lxd-ovs/Vagrantfile
+++ b/lxd-ovs/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml' module
 require 'yaml'
@@ -33,11 +35,17 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
       # Perform final provisioning activities
       srv.vm.provision "shell", path: "setup.sh", privileged: true
 
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx["memsize"] = servers["ram"]
         vmw.vmx["numvcpus"] = servers["vcpu"]
-      end # srv.vm.provider
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = servers["ram"]
+        vb.cpus = servers["vcpu"]
+      end # srv.vm.provider virtualbox
     end # config.vm.define
   end # servers.each
 end # Vagrant.configure
diff --git a/lxd-shell/Vagrantfile b/lxd-shell/Vagrantfile
index 1ef3280..baefee4 100755
--- a/lxd-shell/Vagrantfile
+++ b/lxd-shell/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml' module
 require 'yaml'
@@ -33,11 +35,17 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
       # Perform final provisioning activities
       srv.vm.provision "shell", path: "setup.sh", privileged: true
 
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx["memsize"] = servers["ram"]
         vmw.vmx["numvcpus"] = servers["vcpu"]
-      end # srv.vm.provider
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = servers["ram"]
+        vb.cpus = servers["vcpu"]
+      end # srv.vm.provider virtualbox
     end # config.vm.define
   end # servers.each
 end # Vagrant.configure
diff --git a/openstack-cli/Vagrantfile b/openstack-cli/Vagrantfile
index 9f11298..4687cd1 100644
--- a/openstack-cli/Vagrantfile
+++ b/openstack-cli/Vagrantfile
@@ -5,6 +5,8 @@
 Vagrant.require_version ">= 1.6.0"
 VAGRANTFILE_API_VERSION = "2"
 ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'virtualbox'
 
 # Require 'yaml' module
 require 'yaml'
@@ -29,15 +31,22 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 
       # Enable default synced folder
       srv.vm.synced_folder ".", "/vagrant"
+
       # Perform final provisioning activities
       srv.vm.provision "shell", path: "config.sh", privileged: true
       srv.vm.provision "file", source: "adminrc", destination: "/home/vagrant/adminrc"
 
-      # Configure VMs with RAM and CPUs per settings in servers.yml
+      # Configure VMs with RAM and CPUs per settings in servers.yml (Fusion)
       srv.vm.provider :vmware_fusion do |vmw|
         vmw.vmx["memsize"] = servers["ram"]
         vmw.vmx["numvcpus"] = servers["vcpu"]
-      end
-    end
-  end
-end
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml (VirtualBox)
+      srv.vm.provider :virtualbox do |vb|
+        vb.memory = servers["ram"]
+        vb.cpus = servers["vcpu"]
+      end # srv.vm.provider virtualbox
+    end # config.vm.define
+  end # servers.each
+end # Vagrant.configure