SETUP

Install packages for master

Disable SWAP:

sudo swapoff -a 

Install docker:

sudo apt install -y docker.io

Debian, Ubuntu, and operating systems using apt/apt-get
Replace the apt repository definition so that apt points to the new repository instead of the Google-hosted repository. Make sure to replace the Kubernetes minor version in the command below with the minor version that you're currently using:

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

Download the public signing key for the Kubernetes package repositories. The same signing key is used for all repositories, so you can disregard the version in the URL:

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

Update: In releases older than Debian 12 and Ubuntu 22.04, the folder /etc/apt/keyrings does not exist by default, and it should be created before the curl command.

Update the apt package index:

sudo apt-get update

Install Kubernetes components:

sudo apt-get install -y kubelet kubeadm kubectl

Install packages for worker node/s

Disable SWAP:

sudo swapoff -a 

https://kubernetes.io/blog/2023/08/15/pkgs-k8s-io-introduction/ 

Install docker:

sudo apt install -y docker.io

Debian, Ubuntu, and operating systems using apt/apt-get
Replace the apt repository definition so that apt points to the new repository instead of the Google-hosted repository. Make sure to replace the Kubernetes minor version in the command below with the minor version that you're currently using:

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

Download the public signing key for the Kubernetes package repositories. The same signing key is used for all repositories, so you can disregard the version in the URL:

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

Update: In releases older than Debian 12 and Ubuntu 22.04, the folder /etc/apt/keyrings does not exist by default, and it should be created before the curl command.

Update the apt package index:

sudo apt-get update

Install Kubernetes components:

apt-get install -y kubelet kubeadm kubectl

Initialise Kubernetes Control Plane (Master)

sudo kubeadm init --pod-network-cidr=10.244.0.0/16

--pod-network-cidr=192.168.0.0/16: This specifies the CIDR range for Pod networking. This value might differ depending on the CNI (Container Network Interface) plugin you choose later.

To start using your cluster, you need to run the following as a regular user:

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

Configure pod network

Kubernetes requires a network add-on to enable communication between Pods. There are several options available, such as Calico, Flannel, and Weave. For this example, let’s use Calico. From the Control Plane:

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Note: Ensure the CIDR specified in kubeadm init matches the network add-on requirements.

Join the worker nodes to the cluster:

sudo kubeadm join <master-ip>:<master-port> --token <token> --discovery-token-ca-cert-hash <hash>

Replace <master-ip>, <master-port>, <token>, and <hash> with the values provided by the output of kubeadm init. In this example, my output was:

kubeadm join 192.168.1.114:6443 --token tw8h7m.1yjwutss70lfyn89 --discovery-token-ca-cert-hash sha256:d08527b8e9c3ca103ffd911d7b0fa142aec3e14914e2d78f974aae74f0641fc9

Configure container network

 

There are various network plugins available for kuberenetes;

Calico

Pull configuration on control-plane:

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Check cluster state:

kubectl get nodes

Example;

root@k8s-ma:~# kubectl get nodes
NAME          STATUS     ROLES           AGE   VERSION
k8s-ma        Ready      control-plane   13m   v1.28.14
k8s-worker1   NotReady   <none>          12m   v1.28.14
k8s-worker2   Ready      <none>          12m   v1.28.14