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Go to the lab Master machine:

STEP 1: On Master Node Only:

Execute below commands to Configure Docker Daemon:

sudo su –

sudo wget https://raw.githubusercontent.com/lerndevops/labs/master/kubernetes/0-install/daemon.json -P /etc/docker

sudo systemctl restart docker.service

sudo service docker status

Initialize kubernetes Master Node

sudo kubeadm init

To fix the problem of The connection to the server localhost:8080 was refused - did you specify the right host or port?

Run the below commands

sudo mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

install networking driver -- Weave/flannel/canal/calico etc...

sudo kubectl apply -f https://raw.githubusercontent.com/projectcalico/calico/v3.24.1/manifests/calico.yaml

Validate: kubectl get nodes

Step 2: ON ALL Worker Nodes

Configure Docker Daemon:

sudo su -

hostname WORKER1

sudo su -

sudo wget https://raw.githubusercontent.com/lerndevops/labs/master/kubernetes/0-install/daemon.json -P /etc/docker

sudo systemctl restart docker.service

sudo service docker status

Run Below on Master Node to get join token

sudo kubeadm token create --print-join-command

copy the kubeadm join token from master & run it on all nodes

Ex: sudo kubeadm join 10.128.15.231:6443 --token mks3y2.v03tyyru0gy12mbt \
       --discovery-token-ca-cert-hash sha256:3de23d42c7002be0893339fbe558ee75e14399e11f22e3f0b34351077b7c4b56

Validate on master node

kubectl get nodes

kubectl get nodes -o wide

If nodes are with status as NotReady, then delete the node and join it again in the cluster

Execute below steps:

On Master Node:

kubectl delete node nodename

kubectl get nodes

On the same Worker node that we have to delete:

kubeadm reset --force

On master Node:

generate the token again, execute below command:

sudo kubeadm token create --print-join-command

Copy the token

On Worker Node:

Copy the token, the node will join the master node

On Master Node:

kubectl get nodes

If Master and worker Nodes are Not Ready, try these 2 solutions:

I set it as below and restarted lab.. its fix issue and all node in ready state..

sudo hostnamectl set-hostname master sudo hostnamectl set-hostname worker1 sudo hostnamectl set-hostname worker2

OR

all 3 nodes recovered:

Master Node:

kubeadm reset --force

rm -rf /var/lib/kubelet /etc/kubernetes /var/lib/etcd $HOME/.kube

sudo kubeadm init

sudo mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl get nodes

sudo kubeadm token create --print-join-command

Then on worker nodes we just need to:

kubeadm reset --force sudo kubeadm join ...... the value collected from Master Node no need to install the network again