setup Kubernetes digitalocean ubuntu 22.04

auto-sudo.sh

sudo apt update
sudo cat << EOF | sudo tee /etc/modules-load.d/k8s-modules.conf
br_netfilter
overlay
EOF
sudo cat << EOF |  sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sudo sysctl --system
sudo apt-get update ; sudo apt-get install -y containerd
sudo mkdir -p /etc/containerd
sudo 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
swapoff -a
sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add
sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"
sudo apt install -y kubeadm kubelet kubectl
kubeadm init --pod-network-cidr=192.168.0.0/16
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config
sudo kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Latest k8s packages can be installed using new keys.

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.31/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
chmod 644 /etc/apt/keyrings/kubernetes-apt-keyring.gpg

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.31/deb/ /' | tee /etc/apt/sources.list.d/kubernetes.list
chmod 644 /etc/apt/sources.list.d/kubernetes.list

Reference: https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/#install-using-native-package-management