Install Vagrant + libvirt and create Vagrantfile ale to run 3 VMs in KVM hypervisor

install_vagrant-libvirt_Vagrantfile.sh

# Install Vagrant libvirt plugin (with all the dependencies like qemu, libvirt, vagrant, ...)
dnf install -y -q ansible git libvirt-client libvirt-nss python-netaddr python-virtualenv vagrant-libvirt
vagrant plugin install vagrant-libvirt

# Enable dns resolution of VMs taken from libvirt (https://lukas.zapletalovi.com/2017/10/definitive-solution-to-libvirt-guest-naming.html)
sed -i.orig 's/files dns myhostname/files libvirt libvirt_guest dns myhostname/' /etc/nsswitch.conf

# Start the libvirt daemon 
service libvirtd start

# Create ssh key if it doesn't exist
test -f ~/.ssh/id_rsa.pub || ssh-keygen -f $HOME/.ssh/id_rsa -N ''

# Create directory structure
mkdir /var/tmp/kubernetes_cluster
cd /var/tmp/kubernetes_cluster

# Create Vagrantfile
cat > Vagrantfile << EOF
box_image = "peru/my_ubuntu-16.04-server-amd64"
node_count = 4
ssh_pub_key = File.readlines("#{Dir.home}/.ssh/id_rsa.pub").first.strip

Vagrant.configure(2) do |config|
  config.vm.synced_folder ".", "/vagrant", :disabled => true
  config.vm.box = box_image

  config.vm.provider :libvirt do |domain|
    domain.cpus = 2
    domain.memory = 2048
    domain.default_prefix = ''
  end

  (1..node_count).each do |i|
    config.vm.define "kube0#{i}" do |config|
      config.vm.hostname = "kube0#{i}"
    end
  end

  config.vm.provision 'shell', inline: "install -m 0700 -d /root/.ssh/; echo #{ssh_pub_key} >> /root/.ssh/authorized_keys; chmod 0600 /root/.ssh/authorized_keys"
  config.vm.provision 'shell', inline: "echo #{ssh_pub_key} >> /home/vagrant/.ssh/authorized_keys", privileged: false
end
EOF

# Create and start virtual machines
vagrant up