kubeadm-ubuntu-setup.sh

#/bin/bash -eu

cat /etc/fstab | sed /swap/d | tee /etc/fstab
swapoff -a

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

modprobe overlay
modprobe br_netfilter

# Setup required sysctl params, these persist across reboots.
cat <<EOF | 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
sysctl --system

## Install containerd

apt-get update
apt-get install ca-certificates curl gnupg lsb-release
mkdir -m 0755 -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
apt-get update
apt-get install -y containerd.io

# Configure containerd
mkdir -p /etc/containerd
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
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

KUBERNETES_VERSION=v1.30

apt-get update && apt-get install -y apt-transport-https curl
curl -fsSL https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
cat <<EOF | tee /etc/apt/sources.list.d/kubernetes.list
deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/ /
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
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

# Create a Kubernetes cluster
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

# Run as root
curl -sL https://gist.github.com/tuna2134/8359e2ebbd7c7601ef3316d5f83c7cda/raw/cb143bf96c6978f0a5ddc027109db0630195367d/kubeadm-ubuntu-setup.sh | bash