Install k8s as one control plane and one worker node

The first thing you will need to do which is configure the two servers, either you can choose one of the following options:-

  • VMWARE
  • Cloud

Master Node Setup

Step #1

Create configuration file for containerd:

cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

After the above step, you need to load the modules.

sudo modprobe overlay
sudo modprobe br_netfilter

Step #2

Set system configurations for Kubernetes networking

cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

Apply new settings

sudo sysctl --system

Step #3

Install Containerd

sudo apt-get update && sudo apt-get install -y containerd

Step #4

Create default configuration file for containerd

sudo mkdir -p /etc/containerd

Generate default containerd configuration and save to the newly created default file

sudo containerd config default | sudo tee /etc/containerd/config.toml

Load the new configuration

sudo systemctl restart containerd
sudo systemctl status containerd

Step #5

Disable Swap

sudo swapoff -a

Step #6

Install dependency packages:

sudo apt-get update && sudo apt-get install -y apt-transport-https curl

Download and add GPG key

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

Add Kubernetes to repository list

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

sudo apt-get update

Step #6

Install Kubernetes packages (Note: If you get a dpkg lock message, just wait a minute or two before trying the command again):

sudo apt-get install -y kubelet=1.24.0-00 kubeadm=1.24.0-00 kubectl=1.24.0-00

Just in case Turn off automatic updates

sudo apt-mark hold kubelet kubeadm kubectl

The above steps should be done on the worker node even if you have 3 or 4.

Initialize the Cluster

Initialize the Kubernetes cluster on the control plane node using kubeadm (Note: This is only performed on the Control Plane Node):

sudo kubeadm init --pod-network-cidr 192.168.0.0/16 --kubernetes-version 1.24.0

Set kubectl access:

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

You can test your cluster by run

kubectl get nodes

Install the Calico Network Add-On

On the control plane node, install Calico Networking

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

Check status of the control plane node:

kubectl get nodes

Join the Worker Nodes to the Cluster

In the control plane node, create the token and copy the kubeadm join command (NOTE:The join command can also be found in the output from kubeadm init command):

kubeadm token create --print-join-command

Copy the output

Worker node Setup.

from the above command of Kubeadm join run it using sudo command.

In the control plane node, view cluster status (Note: You may have to wait a few moments to allow all nodes to become ready)

kubectl get nodes

Cheers

Enjoy the DevOps

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