install.sh

#!/bin/bash

# Disable swap
sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

# Update system
sudo apt update && sudo apt upgrade -y

# Install dependencies
sudo apt install -y apt-transport-https ca-certificates curl software-properties-common

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

sudo sysctl --system

sudo modprobe overlay
sudo modprobe br_netfilter

# Add Docker's official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# Add Docker repository
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

# Update the package database with the Docker packages from the newly added repo
sudo apt update

# Install Docker from the official Docker repository
sudo apt install -y containerd.io
sudo mkdir -p /etc/containerd
sudo containerd config default | sudo tee /etc/containerd/config.toml
sudo sed -i 's/            SystemdCgroup = false/            SystemdCgroup = true/' /etc/containerd/config.toml
sudo systemctl restart containerd

# Start and enable Docker service
sudo systemctl start docker
sudo systemctl enable docker

# Install kubeadm, kubelet, and kubectl
sudo apt update
sudo apt install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl


# Initialize the cluster
sudo kubeadm config images pull
sudo kubeadm init --control-plane-endpoint=k8s-master.k8s.lan --pod-network-cidr=192.168.0.0/16

# Set up kubeconfig for the current user
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# Install a pod network add-on (Calico in this example)
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

# Install Helm
curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

# Install etcd using Helm
helm repo add bitnami https://charts.bitnami.com/bitnami
kubectl create ns etcd
helm install etcd bitnami/etcd -n etcd