k8s-debian-setup.sh

#!/bin/bash

read -p "Build with master node? (y/n): " MASTER_NODE

read -p "What are you using kubernetes version? (example v1.30): " KUBERNETES_VERSION

# Install Containerd
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

sudo modprobe overlay
sudo modprobe br_netfilter

# Setup required sysctl params, these persist across reboots.
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

# Apply sysctl params without reboot
sudo sysctl --system

## Install containerd
sudo apt-get update && sudo apt-get install -y containerd

# Configure containerd
sudo mkdir -p /etc/containerd
sudo containerd config default > /etc/containerd/config.toml

if grep -q "SystemdCgroup = true" "/etc/containerd/config.toml"; then
  echo "Config found, skip rewriting..."
else
  sed -i -e "s/SystemdCgroup \= false/SystemdCgroup \= true/g" /etc/containerd/config.toml
fi

# Restart containerd
sudo systemctl restart containerd

cat <<EOF | tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.overcommit_memory = 1
vm.panic_on_oom = 0
kernel.panic = 10
kernel.panic_on_oops = 1
kernel.keys.root_maxkeys = 1000000
kernel.keys.root_maxbytes = 25000000
EOF
sysctl --system

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
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

# Set kubeadm config
cat > ~/init_kubelet.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta3
kind: InitConfiguration
bootstrapTokens:
- token: "$(openssl rand -hex 3).$(openssl rand -hex 8)"
  description: "kubeadm bootstrap token"
  ttl: "24h"
nodeRegistration:
  criSocket: "unix:///var/run/containerd/containerd.sock"
---
apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
controllerManager:
  extraArgs:
    bind-address: "0.0.0.0" # Used by Prometheus Operator
scheduler:
  extraArgs:
    bind-address: "0.0.0.0" # Used by Prometheus Operator
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
cgroupDriver: "systemd"
protectKernelDefaults: true
EOF

if [ ${MASTER_NODE} = "hello" ]; then
  kubeadm init --config init_kubelet.yaml

  mkdir -p $HOME/.kube
  cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  chown $(id -u):$(id -g) $HOME/.kube/config

  curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

  helm repo add cilium https://helm.cilium.io/

  sleep 10

  helm install cilium cilium/cilium \
      --namespace kube-system
fi