541 lines
17 KiB
Bash
541 lines
17 KiB
Bash
#!/usr/bin/env bash
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set -Eeuo pipefail
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########################################
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# Arch Linux Kubernetes Control Plane
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# Fully automated master node installer
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# + Official Kubernetes binaries pinned to 1.34.x
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# + Helm
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# + ingress-nginx
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# + cert-manager
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# + Rancher
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########################################
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# ---------- Config ----------
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POD_CIDR="${POD_CIDR:-192.168.0.0/16}"
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CALICO_VERSION="${CALICO_VERSION:-v3.31.4}"
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# Rancher-compatible Kubernetes version
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K8S_VERSION="${K8S_VERSION:-v1.34.6}"
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K8S_SERIES_REGEX='^v1\.34\.[0-9]+$'
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K8S_ARCH="${K8S_ARCH:-amd64}"
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KUBECONFIG_DIR_ROOT="/root/.kube"
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JOIN_COMMAND_FILE="/root/kubeadm-join-command.sh"
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INSTALL_HELM="${INSTALL_HELM:-true}"
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INSTALL_RANCHER="${INSTALL_RANCHER:-true}"
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ALLOW_WORKLOADS_ON_CONTROL_PLANE="${ALLOW_WORKLOADS_ON_CONTROL_PLANE:-true}"
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# Rancher settings
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RANCHER_REPO_CHANNEL="${RANCHER_REPO_CHANNEL:-stable}" # stable | latest | alpha
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RANCHER_BOOTSTRAP_PASSWORD="${RANCHER_BOOTSTRAP_PASSWORD:-}"
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RANCHER_HOSTNAME="${RANCHER_HOSTNAME:-}" # auto -> rancher.<NODE_IP>.sslip.io
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RANCHER_REPLICAS="${RANCHER_REPLICAS:-1}"
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RANCHER_NAMESPACE="${RANCHER_NAMESPACE:-cattle-system}"
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# ingress-nginx settings
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INGRESS_NAMESPACE="${INGRESS_NAMESPACE:-ingress-nginx}"
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INGRESS_CLASS_NAME="${INGRESS_CLASS_NAME:-nginx}"
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# cert-manager settings
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CERT_MANAGER_NAMESPACE="${CERT_MANAGER_NAMESPACE:-cert-manager}"
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# Binary locations
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KUBEADM_BIN="/usr/local/bin/kubeadm"
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KUBECTL_BIN="/usr/local/bin/kubectl"
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KUBELET_BIN="/usr/local/bin/kubelet"
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# Detect the real invoking user when run with sudo
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REAL_USER="${SUDO_USER:-root}"
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REAL_HOME="$(getent passwd "$REAL_USER" | cut -d: -f6 || true)"
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REAL_HOME="${REAL_HOME:-/root}"
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REAL_KUBECONFIG_DIR="${REAL_HOME}/.kube"
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# ---------- Logging ----------
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log() {
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echo
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echo "============================================================"
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echo "[INFO] $*"
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echo "============================================================"
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}
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warn() {
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echo
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echo "[WARN] $*" >&2
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}
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die() {
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echo
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echo "[ERROR] $*" >&2
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exit 1
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}
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# ---------- Helpers ----------
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require_cmd() {
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command -v "$1" >/dev/null 2>&1 || die "Required command not found: $1"
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}
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retry() {
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local attempts="${1:-10}"
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local sleep_seconds="${2:-5}"
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shift 2 || true
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local n=1
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until "$@"; do
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if (( n >= attempts )); then
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return 1
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fi
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warn "Command failed (attempt ${n}/${attempts}): $*"
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sleep "${sleep_seconds}"
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((n++))
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done
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}
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helm_repo_add_force() {
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local name="$1"
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local url="$2"
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if helm repo list 2>/dev/null | awk '{print $1}' | grep -qx "${name}"; then
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helm repo add "${name}" "${url}" --force-update >/dev/null
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else
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helm repo add "${name}" "${url}" >/dev/null
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fi
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}
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kubectl_ns_apply() {
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local ns="$1"
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"${KUBECTL_BIN}" create namespace "${ns}" --dry-run=client -o yaml | "${KUBECTL_BIN}" apply -f -
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}
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download_k8s_binary() {
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local name="$1"
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local tmpdir
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tmpdir="$(mktemp -d)"
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curl -fsSL -o "${tmpdir}/${name}" \
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"https://dl.k8s.io/release/${K8S_VERSION}/bin/linux/${K8S_ARCH}/${name}"
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curl -fsSL -o "${tmpdir}/${name}.sha256" \
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"https://dl.k8s.io/release/${K8S_VERSION}/bin/linux/${K8S_ARCH}/${name}.sha256"
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(
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cd "${tmpdir}"
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echo "$(cat "${name}.sha256") ${name}" | sha256sum --check --status
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) || die "Checksum verification failed for ${name} ${K8S_VERSION}"
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install -o root -g root -m 0755 "${tmpdir}/${name}" "/usr/local/bin/${name}"
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rm -rf "${tmpdir}"
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}
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install_kubelet_service() {
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log "Installing kubelet systemd service"
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mkdir -p /etc/systemd/system/kubelet.service.d
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touch /etc/default/kubelet
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cat >/etc/systemd/system/kubelet.service <<'EOF'
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[Unit]
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Description=kubelet: The Kubernetes Node Agent
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Documentation=https://kubernetes.io/docs/
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After=containerd.service network-online.target
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Wants=network-online.target
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Requires=containerd.service
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[Service]
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ExecStart=/usr/local/bin/kubelet
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Restart=always
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StartLimitInterval=0
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RestartSec=10
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[Install]
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WantedBy=multi-user.target
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EOF
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cat >/etc/systemd/system/kubelet.service.d/10-kubeadm.conf <<'EOF'
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[Service]
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Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
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Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
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EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
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EnvironmentFile=-/etc/default/kubelet
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ExecStart=
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ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
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EOF
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}
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existing_cluster_version() {
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if [[ -f /etc/kubernetes/admin.conf ]]; then
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"${KUBECTL_BIN}" --kubeconfig=/etc/kubernetes/admin.conf version -o json 2>/dev/null | \
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jq -r '.serverVersion.gitVersion // empty'
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fi
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}
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ensure_rancher_supported_k8s() {
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[[ "${K8S_VERSION}" =~ ${K8S_SERIES_REGEX} ]] || die \
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"Rancher is enabled, but K8S_VERSION=${K8S_VERSION} is not a 1.34.x release. Set K8S_VERSION to a supported 1.34.x patch release."
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}
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# ---------- Root check ----------
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if [[ "${EUID}" -ne 0 ]]; then
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die "Run this script as root, for example: sudo ./master_node_install.sh"
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fi
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# ---------- Cleanup on error ----------
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on_error() {
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local exit_code=$?
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warn "Script failed on line $1 with exit code ${exit_code}"
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warn "Useful diagnostics:"
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echo " journalctl -u containerd -u kubelet -b --no-pager | tail -n 200"
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echo " systemctl status containerd kubelet --no-pager"
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echo " ${KUBECTL_BIN} get nodes -o wide"
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echo " ${KUBECTL_BIN} get pods -A"
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exit "${exit_code}"
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}
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trap 'on_error $LINENO' ERR
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if [[ "${INSTALL_RANCHER}" == "true" ]]; then
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ensure_rancher_supported_k8s
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fi
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# ---------- Step 1: Disable swap ----------
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log "Disabling swap immediately"
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swapoff -a || true
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log "Disabling swap persistently in /etc/fstab"
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if [[ -f /etc/fstab ]]; then
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cp /etc/fstab /etc/fstab.bak.$(date +%Y%m%d%H%M%S)
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sed -ri '/\sswap\s/s/^/# DISABLED FOR KUBERNETES: /' /etc/fstab
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fi
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# ---------- Step 2: Update system ----------
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log "Updating package databases and system packages"
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pacman -Syu --noconfirm
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# ---------- Step 3: Resolve iptables conflict automatically ----------
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log "Resolving iptables backend for Kubernetes"
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if pacman -Q iptables >/dev/null 2>&1; then
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log "Removing legacy iptables package so iptables-nft can be installed"
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pacman -Rdd --noconfirm iptables || true
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fi
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# ---------- Step 4: Install required Arch packages ----------
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log "Installing runtime and support packages from Arch"
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pacman -S --needed --noconfirm \
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ca-certificates \
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curl \
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containerd \
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cni-plugins \
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crictl \
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ethtool \
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iptables-nft \
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conntrack-tools \
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socat \
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tar \
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gzip \
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jq \
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openssl \
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helm
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# ---------- Step 5: Remove Arch Kubernetes packages if present ----------
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log "Removing Arch-provided kubeadm/kubectl/kubelet if present"
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for pkg in kubeadm kubectl kubelet; do
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if pacman -Q "${pkg}" >/dev/null 2>&1; then
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pacman -Rdd --noconfirm "${pkg}" || true
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fi
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done
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# ---------- Step 6: Install pinned Kubernetes binaries ----------
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log "Installing Kubernetes binaries ${K8S_VERSION}"
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download_k8s_binary kubeadm
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download_k8s_binary kubectl
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download_k8s_binary kubelet
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require_cmd "${KUBEADM_BIN}"
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require_cmd "${KUBECTL_BIN}"
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require_cmd "${KUBELET_BIN}"
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# ---------- Step 7: Kernel modules ----------
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log "Configuring required kernel modules"
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cat >/etc/modules-load.d/k8s.conf <<'EOF'
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overlay
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br_netfilter
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EOF
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modprobe overlay
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modprobe br_netfilter
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# ---------- Step 8: Sysctl ----------
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log "Configuring Kubernetes sysctl settings"
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cat >/etc/sysctl.d/99-kubernetes-cri.conf <<'EOF'
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net.bridge.bridge-nf-call-iptables = 1
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net.bridge.bridge-nf-call-ip6tables = 1
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net.ipv4.ip_forward = 1
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EOF
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sysctl --system
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# ---------- Step 9: containerd config ----------
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log "Configuring containerd"
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mkdir -p /etc/containerd
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if [[ ! -f /etc/containerd/config.toml ]]; then
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containerd config default >/etc/containerd/config.toml
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else
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cp /etc/containerd/config.toml /etc/containerd/config.toml.bak.$(date +%Y%m%d%H%M%S)
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fi
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sed -ri 's/^\s*SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
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# ---------- Step 10: kubelet service ----------
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install_kubelet_service
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# ---------- Step 11: Enable services ----------
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log "Enabling and starting containerd and kubelet"
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systemctl daemon-reload
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systemctl enable --now containerd
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systemctl enable --now kubelet
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# ---------- Step 12: Wait for containerd ----------
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log "Waiting for containerd to become active"
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for i in {1..20}; do
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if systemctl is-active --quiet containerd; then
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break
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fi
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sleep 1
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done
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systemctl is-active --quiet containerd || die "containerd did not start successfully"
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# ---------- Step 13: Handle existing cluster ----------
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EXISTING_CLUSTER_VERSION="$(existing_cluster_version || true)"
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if [[ -n "${EXISTING_CLUSTER_VERSION}" ]]; then
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log "Detected existing Kubernetes cluster: ${EXISTING_CLUSTER_VERSION}"
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if [[ "${EXISTING_CLUSTER_VERSION}" != "${K8S_VERSION}" ]]; then
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die "Existing cluster version is ${EXISTING_CLUSTER_VERSION}, but this script is pinned to ${K8S_VERSION}. Reset/rebuild the cluster before rerunning."
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fi
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fi
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# ---------- Step 14: Pre-pull Kubernetes images ----------
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log "Pulling Kubernetes control-plane images"
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"${KUBEADM_BIN}" config images pull --kubernetes-version="${K8S_VERSION}"
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# ---------- Step 15: Initialize cluster ----------
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if [[ -f /etc/kubernetes/admin.conf ]]; then
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warn "/etc/kubernetes/admin.conf already exists; skipping kubeadm init"
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else
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log "Initializing Kubernetes control plane"
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"${KUBEADM_BIN}" init \
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--kubernetes-version="${K8S_VERSION}" \
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--pod-network-cidr="${POD_CIDR}"
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fi
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# ---------- Step 16: Configure kubectl for root ----------
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log "Configuring kubectl for root"
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mkdir -p "${KUBECONFIG_DIR_ROOT}"
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cp -f /etc/kubernetes/admin.conf "${KUBECONFIG_DIR_ROOT}/config"
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chmod 600 "${KUBECONFIG_DIR_ROOT}/config"
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export KUBECONFIG=/etc/kubernetes/admin.conf
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# ---------- Step 17: Configure kubectl for invoking user ----------
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if [[ -n "${REAL_HOME}" && -d "${REAL_HOME}" ]]; then
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log "Configuring kubectl for user ${REAL_USER}"
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mkdir -p "${REAL_KUBECONFIG_DIR}"
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cp -f /etc/kubernetes/admin.conf "${REAL_KUBECONFIG_DIR}/config"
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chown -R "${REAL_USER}:${REAL_USER}" "${REAL_KUBECONFIG_DIR}"
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chmod 600 "${REAL_KUBECONFIG_DIR}/config"
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else
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warn "Could not determine invoking user's home directory; skipping user kubeconfig setup"
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fi
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# ---------- Step 18: Verify cluster version ----------
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log "Verifying Kubernetes server version"
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SERVER_VERSION="$("${KUBECTL_BIN}" version -o json | jq -r '.serverVersion.gitVersion')"
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[[ "${SERVER_VERSION}" =~ ${K8S_SERIES_REGEX} ]] || die \
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"Cluster server version ${SERVER_VERSION} is not a supported 1.34.x release for this Rancher workflow."
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# ---------- Step 19: Wait for API ----------
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log "Waiting for Kubernetes API to become responsive"
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retry 60 5 "${KUBECTL_BIN}" version --request-timeout=10s >/dev/null
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# ---------- Step 20: Optionally allow workloads on control-plane ----------
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if [[ "${ALLOW_WORKLOADS_ON_CONTROL_PLANE}" == "true" ]]; then
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log "Allowing workloads on the control-plane node (single-node/lab mode)"
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"${KUBECTL_BIN}" taint nodes --all node-role.kubernetes.io/control-plane- >/dev/null 2>&1 || true
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"${KUBECTL_BIN}" taint nodes --all node-role.kubernetes.io/master- >/dev/null 2>&1 || true
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fi
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# ---------- Step 21: Install Calico ----------
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log "Installing Calico networking"
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"${KUBECTL_BIN}" apply -f "https://raw.githubusercontent.com/projectcalico/calico/${CALICO_VERSION}/manifests/calico.yaml"
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# ---------- Step 22: Wait for node readiness ----------
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log "Waiting for node(s) to become Ready"
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"${KUBECTL_BIN}" wait --for=condition=Ready node --all --timeout=10m
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# ---------- Step 23: Wait for Calico ----------
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log "Waiting for Calico components"
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"${KUBECTL_BIN}" -n kube-system rollout status daemonset/calico-node --timeout=10m || true
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"${KUBECTL_BIN}" -n kube-system rollout status deployment/calico-kube-controllers --timeout=10m || true
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# ---------- Step 24: Save worker join command ----------
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log "Saving worker join command"
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"${KUBEADM_BIN}" token create --print-join-command > "${JOIN_COMMAND_FILE}"
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chmod 700 "${JOIN_COMMAND_FILE}"
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# ---------- Step 25: Determine node info ----------
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log "Determining control-plane node information"
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NODE_NAME="$("${KUBECTL_BIN}" get nodes -o jsonpath='{.items[0].metadata.name}')"
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NODE_IP="$("${KUBECTL_BIN}" get node "${NODE_NAME}" -o jsonpath='{.status.addresses[?(@.type=="InternalIP")].address}')"
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if [[ -z "${NODE_NAME}" || -z "${NODE_IP}" ]]; then
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die "Failed to determine node name or node IP"
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fi
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if [[ -z "${RANCHER_HOSTNAME}" ]]; then
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RANCHER_HOSTNAME="rancher.${NODE_IP}.sslip.io"
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fi
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if [[ -z "${RANCHER_BOOTSTRAP_PASSWORD}" ]]; then
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RANCHER_BOOTSTRAP_PASSWORD="$(openssl rand -base64 24 | tr -d '\n' | tr '/+' 'AB' | cut -c1-20)"
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fi
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echo "${RANCHER_BOOTSTRAP_PASSWORD}" >/root/rancher-bootstrap-password.txt
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chmod 600 /root/rancher-bootstrap-password.txt
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# ---------- Step 26: Install Helm repos ----------
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if [[ "${INSTALL_HELM}" == "true" ]]; then
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log "Configuring Helm repositories"
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helm_repo_add_force ingress-nginx https://kubernetes.github.io/ingress-nginx
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helm_repo_add_force jetstack https://charts.jetstack.io
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case "${RANCHER_REPO_CHANNEL}" in
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stable)
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helm_repo_add_force rancher-stable https://releases.rancher.com/server-charts/stable
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RANCHER_CHART="rancher-stable/rancher"
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;;
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latest)
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helm_repo_add_force rancher-latest https://releases.rancher.com/server-charts/latest
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RANCHER_CHART="rancher-latest/rancher"
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;;
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alpha)
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helm_repo_add_force rancher-alpha https://releases.rancher.com/server-charts/alpha
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RANCHER_CHART="rancher-alpha/rancher"
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;;
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*)
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die "Invalid RANCHER_REPO_CHANNEL: ${RANCHER_REPO_CHANNEL} (expected: stable, latest, alpha)"
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;;
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esac
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helm repo update
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fi
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# ---------- Step 27: Install ingress-nginx ----------
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if [[ "${INSTALL_RANCHER}" == "true" ]]; then
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log "Installing ingress-nginx"
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kubectl_ns_apply "${INGRESS_NAMESPACE}"
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helm upgrade --install ingress-nginx ingress-nginx/ingress-nginx \
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--namespace "${INGRESS_NAMESPACE}" \
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--create-namespace \
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--set controller.kind=DaemonSet \
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--set controller.hostNetwork=true \
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--set controller.dnsPolicy=ClusterFirstWithHostNet \
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--set controller.service.type=ClusterIP \
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--set controller.ingressClass="${INGRESS_CLASS_NAME}" \
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--set controller.ingressClassResource.name="${INGRESS_CLASS_NAME}" \
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--set controller.ingressClassResource.default=true \
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--set controller.watchIngressWithoutClass=true \
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--set controller.reportNodeInternalIp=true \
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--wait \
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--timeout 15m
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log "Waiting for ingress-nginx controller"
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"${KUBECTL_BIN}" -n "${INGRESS_NAMESPACE}" rollout status daemonset/ingress-nginx-controller --timeout=15m
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fi
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# ---------- Step 28: Install cert-manager ----------
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if [[ "${INSTALL_RANCHER}" == "true" ]]; then
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log "Installing cert-manager"
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kubectl_ns_apply "${CERT_MANAGER_NAMESPACE}"
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|
|
helm upgrade --install cert-manager jetstack/cert-manager \
|
|
--namespace "${CERT_MANAGER_NAMESPACE}" \
|
|
--create-namespace \
|
|
--set crds.enabled=true \
|
|
--wait \
|
|
--timeout 15m
|
|
|
|
log "Waiting for cert-manager deployments"
|
|
"${KUBECTL_BIN}" -n "${CERT_MANAGER_NAMESPACE}" rollout status deployment/cert-manager --timeout=15m
|
|
"${KUBECTL_BIN}" -n "${CERT_MANAGER_NAMESPACE}" rollout status deployment/cert-manager-cainjector --timeout=15m
|
|
"${KUBECTL_BIN}" -n "${CERT_MANAGER_NAMESPACE}" rollout status deployment/cert-manager-webhook --timeout=15m
|
|
fi
|
|
|
|
# ---------- Step 29: Install Rancher ----------
|
|
if [[ "${INSTALL_RANCHER}" == "true" ]]; then
|
|
log "Installing Rancher"
|
|
|
|
kubectl_ns_apply "${RANCHER_NAMESPACE}"
|
|
|
|
helm upgrade --install rancher "${RANCHER_CHART}" \
|
|
--namespace "${RANCHER_NAMESPACE}" \
|
|
--create-namespace \
|
|
--set hostname="${RANCHER_HOSTNAME}" \
|
|
--set bootstrapPassword="${RANCHER_BOOTSTRAP_PASSWORD}" \
|
|
--set replicas="${RANCHER_REPLICAS}" \
|
|
--set ingress.ingressClassName="${INGRESS_CLASS_NAME}" \
|
|
--set ingress.tls.source=rancher \
|
|
--wait \
|
|
--timeout 20m
|
|
|
|
log "Waiting for Rancher rollout"
|
|
"${KUBECTL_BIN}" -n "${RANCHER_NAMESPACE}" rollout status deployment/rancher --timeout=20m || true
|
|
fi
|
|
|
|
# ---------- Step 30: Show cluster status ----------
|
|
log "Cluster status"
|
|
"${KUBECTL_BIN}" get nodes -o wide || true
|
|
echo
|
|
"${KUBECTL_BIN}" get pods -A || true
|
|
echo
|
|
"${KUBECTL_BIN}" get ingress -A || true
|
|
|
|
# ---------- Final output ----------
|
|
echo
|
|
echo "Kubernetes control plane installation is complete."
|
|
echo
|
|
echo "Pinned Kubernetes version:"
|
|
echo " ${K8S_VERSION}"
|
|
echo
|
|
echo "kubectl configured for:"
|
|
echo " root: ${KUBECONFIG_DIR_ROOT}/config"
|
|
echo " ${REAL_USER}: ${REAL_KUBECONFIG_DIR}/config"
|
|
echo
|
|
echo "Worker join command saved to:"
|
|
echo " ${JOIN_COMMAND_FILE}"
|
|
echo
|
|
echo "To view it:"
|
|
echo " sudo cat ${JOIN_COMMAND_FILE}"
|
|
echo
|
|
|
|
if [[ "${INSTALL_RANCHER}" == "true" ]]; then
|
|
echo "Rancher install completed."
|
|
echo
|
|
echo "Rancher URL:"
|
|
echo " https://${RANCHER_HOSTNAME}"
|
|
echo
|
|
echo "Rancher bootstrap password saved to:"
|
|
echo " /root/rancher-bootstrap-password.txt"
|
|
echo
|
|
echo "To view it:"
|
|
echo " sudo cat /root/rancher-bootstrap-password.txt"
|
|
echo
|
|
echo "Notes:"
|
|
echo " - Rancher is using a 1.34.x Kubernetes control plane on purpose for compatibility."
|
|
echo " - ingress-nginx is using host networking, so access Rancher directly on this node's IP over 443."
|
|
echo " - If a local firewall is enabled, ensure ports 80 and 443 are allowed."
|
|
echo " - Rancher-generated TLS will usually produce a browser warning until you trust the cert."
|
|
echo
|
|
fi |