Installing kubeadm

install_kubeadm.sh

#!/bin/bash
set -x -e

VERSION="${1:-1.28}"
apt-get update
apt-get install -y apt-transport-https ca-certificates curl gpg
mkdir -p -m 755 /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v${VERSION}/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v${VERSION}/deb/ /" | tee /etc/apt/sources.list.d/kubernetes.list
apt-get update
apt-get install -y kubelet kubeadm kubectl containerd
apt-mark hold kubelet kubeadm kubectl containerd

echo "br_netfilter" | tee /etc/modules-load.d/kubernetes.conf
systemctl restart systemd-modules-load.service

echo """
net.bridge.bridge-nf-call-iptables=1
net.ipv4.ip_forward=1
""" | tee /etc/sysctl.d/98-kubernetes.conf
sysctl -p /etc/sysctl.d/98-kubernetes.conf 

mkdir -p /etc/containerd 
containerd config default > /etc/containerd/config.toml
sudo sed -i 's/ SystemdCgroup = false/ SystemdCgroup = true/' /etc/containerd/config.toml
systemctl restart containerd