master2.sh

master2.sh

#!/bin/bash

Cleanup Kubernetes installation if any previous setup exists

echo "Cleaning up previous Kubernetes setup..." sudo hostname master-node-1 sudo kubeadm reset -f sudo apt-get purge kubeadm kubelet kubectl -y sudo apt-get autoremove -y sudo apt-get purge containerd -y sudo apt-get autoremove -y

Remove Kubernetes and containerd configuration files and directories

echo "Removing Kubernetes and containerd configuration files..." sudo rm -rf /etc/cni sudo rm -rf /opt/cni sudo rm -rf /etc/cni/net.d sudo rm -rf /var/lib/kubelet sudo rm -rf /etc/kubernetes

Update and prepare the system

echo "Updating and upgrading system packages..." sudo apt update && sudo apt upgrade -y

Disable swap

echo "Disabling swap..." sudo swapoff -a sudo sed -i '/ swap / s/^/#/' /etc/fstab

Install required packages for Kubernetes installation

echo "Installing necessary packages for Kubernetes..." sudo apt install -y apt-transport-https ca-certificates curl

Add Kubernetes repository and GPG key

echo "Adding Kubernetes repository..." echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /" | sudo tee /etc/apt/sources.list.d/kubernetes.list curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

Update package list and install Kubernetes components

echo "Installing Kubernetes components..." sudo apt-get update -y sudo apt-get install -y kubelet kubeadm kubectl sudo apt-mark hold kubelet kubeadm kubectl

Install containerd

echo "Installing containerd..." sudo apt install -y containerd sudo mkdir -p /etc/containerd containerd config default | sudo tee /etc/containerd/config.toml sudo systemctl restart containerd sudo systemctl enable containerd sudo systemctl status containerd --no-pager

Verify the installed versions

echo "Verifying installed versions..." kubelet --version kubeadm version kubectl version --client

Configure Kubernetes networking and IP forwarding

echo "Configuring Kubernetes networking..." echo -e "br_netfilter" | sudo tee /etc/modules-load.d/k8s.conf && sudo modprobe br_netfilter echo -e "net.bridge.bridge-nf-call-ip6tables = 1\nnet.bridge.bridge-nf-call-iptables = 1" | sudo tee /etc/sysctl.d/k8s.conf echo "net.ipv4.ip_forward=1" | sudo tee /etc/sysctl.d/99-kubernetes-ip-forward.conf sudo sysctl --system

Initialize the Kubernetes master node

echo "Initializing Kubernetes master node..."
sudo kubeadm init --pod-network-cidr=192.168.0.0/16

Configure kubectl for the master node

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

Apply Calico networking

echo "Applying Calico networking..." kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Get the status of nodes

echo "Getting the status of nodes..." kubectl get nodes