How to Setup Kubernetes (k8s) Cluster on Ubuntu 22.04 Step by Step
In this video tutorial, we will show you how to setup Kubernetes cluster step by step.
Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. It allows you to easily manage your applications and services, and provides you with a highly scalable and fault-tolerant infrastructure.
########### Kubernetes Install steps ###################
1) Update host entries, disable swap and add kernel parameters.
192.168.1.190 k8smaster.example.com k8smaster
192.168.1.191 k8sworker.example.com k8sworker
sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo vi /etc/modules-load.d/containerd.conf
overlay
br_netfilter
save and close the file
sudo modprobe overlay
sudo modprobe br_netfilter
sudo vi /etc/sysctl.d/kubernetes.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
Reload the above kernel parameters
sudo sysctl --system
2) Install Containerd and Enable Kubernetes repository.
sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
Enable Docker Repository,
sudo curl -fsSL https://download.docker.com/linux/ubu... | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/docker.gpg
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Now, install containerd
sudo apt update && sudo apt install -y containerd.io
Configure containerd so that it starts using systemd as cgroup.
containerd config default | sudo tee /etc/containerd/config.toml
sudo sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' /etc/containerd/config.toml
sudo systemctl restart containerd && sudo systemctl enable containerd
3) Install kubeadm, kubectl and kubelet.
curl -s https://packages.cloud.google.com/apt... | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/kubernetes-xenial.gpg
sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"
sudo apt update && sudo apt install -y kubelet kubeadm kubectl && sudo apt-mark hold kubelet kubeadm kubectl
4) Initialize Kubernetes cluster
sudo kubeadm init --control-plane-endpoint=k8smaster.example.com
It may take 4 to 5 minutes depending on the internet speed,
So, to interact with cluster, copy paste commands from the output
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Run kubectl command,
kubectl cluster-info
kubectl get nodes
5) Add worker node to cluster & install calico cni
sudo kubeadm join k8smaster.example.net:6443 ( Copy the command from kubeadm command's output)
Install Calico CNI
kubectl apply -f https://raw.githubusercontent.com/pro...
verify calico pods
kubectl get pods -n kube-system
Now nodes should be Ready State, run
kubectl get nodes
6) Test Kubernetes cluster installation.
To test Kubernetes installation, let’s try to deploy nginx based application and try to access it.
kubectl create deployment nginx-app --image=nginx --replicas=2
Verify Deployment and pods status,
kubectl get deployment nginx-app
kubectl get pods
Expose the deployment,
kubectl expose deployment nginx-app --type=NodePort --port=80
Verify the service status,
kubectl get svc nginx-app && kubectl describe svc nginx-app
Access nginx application using worker IP and nodeport
curl http://worker-ip-address:nodeport
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