Vagrant cluster Libvirt

Vagrantfile

Vagrant.configure('2') do |config|
  config.vm.box = "centos/7"
  config.vm.box_check_update = true
  (51..53).each do |i|
    config.vm.define "docker#{i}" do |node|
      node.vm.hostname = "docker#{i}"
      #node.vm.network "private_network", ip: "192.168.121.#{i}"
      node.vm.network :private_network, ip: "192.168.123.#{i}"
      node.vm.provider :kvm do |kvm, override|
         kvm.memory_size = '2048m'
      end
      node.vm.provider :libvirt do |libvirt, override|
         libvirt.memory = 2048
         libvirt.nested = true
      end
    end
  end  

  config.vm.provision "shell", inline: <<-SHELL
    yum clean all && yum repolist && yum upgrade -y
    curl -fsSL get.docker.com |bash
  SHELL
end