Ansible: Vagrant: Add libvirt support

contrib/ansible/vagrant/README.md

@@ -4,7 +4,7 @@ This deployer sets up a vagrant cluster and installs kubernetes with flannel on
 
 ## Before you start !
 
-You will need a functioning vagrant provider. Currently supported are openstack and virtualbox.
+You will need a functioning vagrant provider. Currently supported are openstack, libvirt, and virtualbox.
 
 ## USAGE
 
@@ -44,6 +44,15 @@ To use the vagrant openstack provider you will need
 
 For vagrant (1.7.2) does not seem to ever want to pick openstack as the provider. So you will need to tell it to use openstack explicitly.
 
+###### Libvirt
+
+The libvirt vagrant provider is non-deterministic when launching VMs. This is a problem as we need ansible to only run after all of the VMs are running. To solve this when using libvirt one must
+do the following
+```
+vagrant up --no-provision
+vagrant provision
+```
+
 ### VirtualBox
 Nothing special with VirtualBox. Hopefully `vagrant up` just works.
 

contrib/ansible/vagrant/Vagrantfile

@@ -70,6 +70,15 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     vb.customize ["modifyvm", :id, "--nictype2", "virtio"]
   end
 
+  def set_libvirt(lv, config)
+    config.vm.box = "kube-centos-7"
+    config.vm.box_url = "http://cloud.centos.org/centos/7/vagrant/x86_64/images/CentOS-7.LibVirt.box"
+    lv.memory = 2048
+    lv.cpus = 2
+    lv.nested = true
+    lv.volume_cache = 'none'
+  end
+
   def set_provider(n)
     n.vm.provider :openstack do |os, override|
       set_openstack(os, override, n)
@@ -77,6 +86,10 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     n.vm.provider :virtualbox do |vb, override|
       set_vbox(vb, override)
     end
+    n.vm.provider :libvirt do |lv, override|
+      set_libvirt(lv, override)
+    end
+  end
 
   config.vm.synced_folder ".", "/vagrant", disabled: true