Install Kubernetes v1.28

Requirements

You need to have at least three nodes with 4 Gigabytes of RAM and 4 cores of CPU

This time I have one node for master and two nodes for worker nodes

Step 1: Install Kubernetes required packages

{
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo mkdir -m 755 /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet=1.28.4-1.1 kubeadm=1.28.4-1.1 kubectl=1.28.4-1.1
sudo apt install containerd -y
}

Run these commands as well on the nodes

{
sudo apt install containerd -y
sudo modprobe br_netfilter
sudo bash -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
}

Initialize a master node

this command will go and download all the packages

sudo kubeadm init

The output of sudo kubeadm init will be a command for joining worker nodes so run the above command in the worker nodes:

sudo kubeadm join xxx.xxx.xxx.xxx:6443 --token wqjxpm.vqupwqtp5xyvf1cg \
      --discovery-token-ca-cert-hash sha256:637711aswr8e97dcd3fsfc8a1eda15725657d84dd39dfcbc8702050927ff4231

Make sure worker nodes are added

kubectl --kubeconfig /etc/kubernetes/admin.conf get nodes

Output

NAME       STATUS     ROLES           AGE     VERSION
master     NotReady   control-plane   8m13s   v1.28.4
worker-1   NotReady   <none>          59s     v1.28.4
worker-2   NotReady   <none>          7s      v1.28.4

Nodes are added but the STATUS is NotReady! isn’t weird?

It’s because you haven’t installed CNI (container network interface) so we can use Canal, Flannel, Calico, and Weave.

We’ll install Weave.

kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml --kubeconfig path

After few seconds they will be Ready.

Testing

cat > nginx.yaml <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  namespace: default
spec:
  containers:
  - name: nginx
    image: nginx:alpine
EOF

# Check if it has been scheduled and became Ready
kubectl get pod nginx --namespace default --kubeconfig /etc/kubernetes/admin.conf