Install kubeadm on ubuntu

kubeadm.sh

#!/bin/sh

sudo modprobe br_netfilter
sudo sysctl -w net.ipv4.ip_forward=1

#!/bin/bash

# I choose CRI-O because it is easier to install and needs less installation
# Also, versioning seems to match kubernetes version so less confusion about versions
export CRIO_VERSION='v1.33'
export KUBERNETES_VERSION='v1.33'

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gpg

curl -fsSL https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list


curl -fsSL https://download.opensuse.org/repositories/isv:/cri-o:/stable:/$CRIO_VERSION/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/cri-o-apt-keyring.gpg
echo "deb [signed-by=/etc/apt/keyrings/cri-o-apt-keyring.gpg] https://download.opensuse.org/repositories/isv:/cri-o:/stable:/$CRIO_VERSION/deb/ /" | sudo tee /etc/apt/sources.list.d/cri-o.list

sudo apt-get update
sudo apt-get install -y cri-o kubelet kubeadm kubectl

# As recommended by kubeadm docs, hold updates for these packages
sudo apt-mark hold kubelet kubeadm kubectl

sudo systemctl enable --now crio.service
sudo systemctl enable --now kubelet