Install Kubernetes 1.24 on Debian 11

# Install prerequisites
sudo apt-get -y update
sudo apt-get -y install ca-certificates curl gnupg lsb-release

# Setup Docker's repository
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo   "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get -y update

# Install containerd
sudo apt-get -y install containerd.io

# Configure containerd
## comment the line with disabled_plugins in config.toml, this enables containerd cri plugin, after restart
sudo sed -i "s/^\(disabled_plugins\s*=\)/# \1/" /etc/containerd/config.toml

## containerd's CGroup Settings
cat <<EOF | sudo tee -a /etc/containerd/config.toml
### from https://github.com/kubernetes/kubernetes/issues/105762
version = 2

[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
  runtime_type = "io.containerd.runc.v2"

  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
    SystemdCgroup = true

EOF

## restart containerd
sudo systemctl restart containerd


# Firewall
## Load those kernel modules when restarting computer
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

## Load the same modules immediately
sudo modprobe overlay
sudo modprobe br_netfilter

## Settings for the firewall
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

## Load sysctl settings now
sudo sysctl --system

# Kubernetes
## Setup repository
sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update

## Install latest version
sudo apt-get install -y kubelet kubeadm kubectl

# Setup
## Download images for later initialization joining
sudo kubeadm config images pull

echo "If this computer is considered to be the master use:"
echo "  sudo kubeadm --pod-network-cidr=10.244.0.0/16 init"
echo "after that follow the instructions"
echo "Keep in mind to also install a CNI"