How to install putty on macOs

open terminal and type the code.

brew install putty

Now Create 2/3 ubuntu server on VirtualBox

installing Docker on all 3 Machines

First need to update the package list in all 3 machines

sudo apt-get update

• Next install Docker on all 3 machines

sudo apt-get install docker.io

• Next check the version of Docker on all 3 machines

docker ––version

Next set Docker to launch at boot in all 3 machines

sudo systemctl enable docker

Next verify if Docker is running on all 3 machines - Install Kubernetes all 3 machin

sudo systemctl status docker

Since you are downloading Kubernetes from a non-standard repository, it is essential to ensure that the software is authentic. This is done by adding a signing key


echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

Next

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

Since Kubernetes is not included in the default repo, add software repo:

sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"

Enter the following commands to install KUBEADM, KUBELET, KUBECTL:

sudo apt-get install kubeadm kubelet kubectl
sudo apt-mark hold kubeadm kubelet kubectl

Verify the installation: 

kubeadm version


In order to start Kubernetes deployment start by disabling swap memory for each server:

sudo swapoff –a

Assign unique hostname for each server node or machine:

sudo hostnamectl set-hostname master-node
sudo hostnamectl set-hostname worker01
sudo hostnamectl set-hostname worker02

Initialize Kubernetes on Master Node ONLY. Please note cidr 10.244.0.0/16 is designated for Flannel network. This network is required for Pods to communicate with each other. 

sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=all

Please copy the printout kubeadm join command (at the end of the printout) for later use. This command is unique to each cluster and will be used for joining other nodes to the cluster. Need to run the following commands to complete deployment on Master node: 

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

A Pod Network is a way to allow communication between different nodes in the cluster. This tutorial uses the flannel virtual network. Enter the following command on Master node:

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

use code when kubernetes host if error show -

kubeadm reset 

If show error IP address not found like that - so use this code- exmaple
(The connection to the server 192.168.x.x:6443 was refused - did you specify the right host or port? )

sudo cp /etc/kubernetes/admin.conf ~/.kube/config && sudo chown $(id -u):$(id -g) $HOME/.kube/config

Allow the process to complete and verify that everything is running and communicating:

kubectl get pods --all-namespaces

Check the nodes on the current cluster by running the following command in Master node:

kubectl get nodes

As mentioned in the earlier steps (see Kubernetes deployment), now kubeadm join command can be used in each worker node to connect them to the cluster. Run the command on each Worker node (the token part is excluded, since your token and IP should be unique):

sudo kubeadm join 172.31.x.x:6443 --token

if you see the error use this code

kubeadm reset

Now run the “kubectl get nodes” on the Master node to check node status

kubectl get nodes