Multinode kubernetes cluster in virtualbox
1.Update the package repository (All hosts)
sudo apt-get update
2. Install Docker (All hosts)
sudo apt-get install docker.io -y
3. Access Repos via HTTPS (All hosts)
sudo apt-get install apt-transport-https curl -y
4. Add K8S key and Repo (All hosts)
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