install

#Install Docker and Kubernetes to all nodes

Open 3 Azure Cloud shells and Log-in to Launcher VM in each case:
ssh pranabpaul@13.95.211.101                 (Use the public IP of the VM)

Log-in to controller and 2 workers from Launcher prompt using their private IPs:
ssh kuberoot@10.230.0.10
ssh kuberoot@10.230.0.20
ssh kuberoot@10.230.0.21

Run following commands in launcher, controller and both the workers VMs:

============================================================================
Run following commands to install docker, kubelet, kubeadm and kubectl:
# Get the Docker gpg key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

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

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

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

# Update your packages
sudo apt-get update

# Install Docker, kubelet, kubeadm, and kubectl
sudo apt-get install -y docker-ce=5:19.03.9~3-0~ubuntu-bionic kubelet=1.18.6-00 kubeadm=1.18.6-00 kubectl=1.18.6-00

# Hold them at the current version
sudo apt-mark hold docker-ce kubelet kubeadm kubectl

====================================================================

Run following commands in controller and both the workers VMs:
# Add the iptables rule to sysctl.conf
echo "net.bridge.bridge-nf-call-iptables=1" | sudo tee -a /etc/sysctl.conf

# Enable iptables immediately
sudo sysctl -p

===================================================================

Courtsey: https://gist.github.com/chadmcrowell/f2221cf33185c8c52d6e793320d69678