Vagrant file to install 1 master and 1 node in local (node will not join) as its for dev env for CKAD learning. Check kubeadm_init.log for join command in master.

Vagrantfile

Vagrant.configure("2") do |config|
  config.vm.provision :shell, privileged: true, inline: $install_common_tools
  config.vm.define :master do |master|
    master.vm.provider :virtualbox do |vb|
      vb.name = "master"
      vb.memory = 4048
      vb.cpus = 2
    end
    master.vm.box = "ubuntu/bionic64"
    #master.disksize.size = "25GB"
    master.vm.hostname = "master"
    master.vm.network :private_network, ip: "10.0.0.10"
    master.vm.provision :shell, privileged: false, inline: $kube_install
  end

  %w{node1}.each_with_index do |name, i|
    config.vm.define name do |node|
      node.vm.provider "virtualbox" do |vb|
        vb.name = "node#{i + 1}"
        vb.memory = 4048
        vb.cpus = 2
      end
      node.vm.box = "ubuntu/bionic64"
      #node.disksize.size = "25GB"
      node.vm.hostname = name
      node.vm.network :private_network, ip: "10.0.0.#{i + 11}"
      
    end
  end

end

$kube_install = <<-SCRIPT
	sudo kubeadm init --apiserver-advertise-address=10.0.0.10 --pod-network-cidr=10.244.0.0/16 >> kubeadm_init.log
 	mkdir -p $HOME/.kube
  	sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  	sudo chown $(id -u):$(id -g) $HOME/.kube/config

SCRIPT

$install_common_tools = <<-SCRIPT
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

sudo apt-get update
sudo apt-get install -y docker-ce kubelet kubeadm kubectl
echo "net.bridge.bridge-nf-call-iptables=1" | sudo tee -a /etc/sysctl.conf
sudo sysctl -p
echo "1" > /proc/sys/net/ipv4/ip_forward
mkdir -p $HOME/.kube

sudo systemctl enable docker
sudo systemctl start docker

SCRIPT

DevOps quick guide

When preparing for CKAD/CKA you tend to create cluster multiple times and delete as well. This helps do the bare minimal setup of k8s master and node to begin practicing.

Start VMs

vagrant up

SSH VMs

vagrant ssh master
vagrant ssh node1

Add node1 to the local cluster

vagrant ssh master
tail kubeadm_init.log # this will give you Kubernetes join command.