158 lines
4.3 KiB
Bash
158 lines
4.3 KiB
Bash
#!/usr/bin/env bash
|
|
set -Eeuo pipefail
|
|
|
|
########################################
|
|
# Arch Linux Kubernetes Worker
|
|
# Prepares worker node for manual join
|
|
########################################
|
|
|
|
# ---------- Logging ----------
|
|
log() {
|
|
echo
|
|
echo "============================================================"
|
|
echo "[INFO] $*"
|
|
echo "============================================================"
|
|
}
|
|
|
|
warn() {
|
|
echo
|
|
echo "[WARN] $*" >&2
|
|
}
|
|
|
|
die() {
|
|
echo
|
|
echo "[ERROR] $*" >&2
|
|
exit 1
|
|
}
|
|
|
|
# ---------- Root check ----------
|
|
if [[ "${EUID}" -ne 0 ]]; then
|
|
die "Run this script as root, for example: sudo ./worker_node_prepare.sh"
|
|
fi
|
|
|
|
# ---------- Cleanup on error ----------
|
|
on_error() {
|
|
local exit_code=$?
|
|
warn "Script failed on line $1 with exit code ${exit_code}"
|
|
warn "Useful diagnostics:"
|
|
echo " journalctl -u containerd -u kubelet -b --no-pager | tail -n 200"
|
|
echo " systemctl status containerd kubelet --no-pager"
|
|
exit "${exit_code}"
|
|
}
|
|
trap 'on_error $LINENO' ERR
|
|
|
|
# ---------- Step 1: Disable swap ----------
|
|
log "Disabling swap immediately"
|
|
swapoff -a || true
|
|
|
|
log "Disabling swap persistently in /etc/fstab"
|
|
if [[ -f /etc/fstab ]]; then
|
|
cp /etc/fstab /etc/fstab.bak.$(date +%Y%m%d%H%M%S)
|
|
sed -ri '/\sswap\s/s/^/# DISABLED FOR KUBERNETES: /' /etc/fstab
|
|
fi
|
|
|
|
# ---------- Step 2: Update system ----------
|
|
log "Updating package databases and system packages"
|
|
pacman -Syu --noconfirm
|
|
|
|
# ---------- Step 3: Resolve iptables conflict automatically ----------
|
|
log "Resolving iptables backend for Kubernetes"
|
|
if pacman -Q iptables >/dev/null 2>&1; then
|
|
log "Removing legacy iptables package so iptables-nft can be installed"
|
|
pacman -Rdd --noconfirm iptables || true
|
|
fi
|
|
|
|
# ---------- Step 4: Install required packages ----------
|
|
log "Installing Kubernetes worker packages"
|
|
pacman -S --needed --noconfirm \
|
|
ca-certificates \
|
|
curl \
|
|
containerd \
|
|
cni-plugins \
|
|
crictl \
|
|
ethtool \
|
|
iptables-nft \
|
|
conntrack-tools \
|
|
socat \
|
|
kubeadm \
|
|
kubectl \
|
|
kubelet
|
|
|
|
# ---------- Step 5: Kernel modules ----------
|
|
log "Configuring required kernel modules"
|
|
cat >/etc/modules-load.d/k8s.conf <<'EOF'
|
|
overlay
|
|
br_netfilter
|
|
EOF
|
|
|
|
modprobe overlay
|
|
modprobe br_netfilter
|
|
|
|
# ---------- Step 6: Sysctl ----------
|
|
log "Configuring Kubernetes sysctl settings"
|
|
cat >/etc/sysctl.d/99-kubernetes-cri.conf <<'EOF'
|
|
net.bridge.bridge-nf-call-iptables = 1
|
|
net.bridge.bridge-nf-call-ip6tables = 1
|
|
net.ipv4.ip_forward = 1
|
|
EOF
|
|
|
|
sysctl --system
|
|
|
|
# ---------- Step 7: Configure containerd ----------
|
|
log "Configuring containerd"
|
|
mkdir -p /etc/containerd
|
|
|
|
if [[ ! -f /etc/containerd/config.toml ]]; then
|
|
containerd config default >/etc/containerd/config.toml
|
|
else
|
|
cp /etc/containerd/config.toml /etc/containerd/config.toml.bak.$(date +%Y%m%d%H%M%S)
|
|
fi
|
|
|
|
# Ensure kubelet/containerd use systemd cgroups
|
|
sed -ri 's/^\s*SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
|
|
|
|
# ---------- Step 8: Enable services ----------
|
|
log "Enabling and starting containerd and kubelet"
|
|
systemctl daemon-reload
|
|
systemctl enable --now containerd
|
|
systemctl enable --now kubelet
|
|
|
|
# ---------- Step 9: Wait for containerd ----------
|
|
log "Waiting for containerd to become active"
|
|
for i in {1..20}; do
|
|
if systemctl is-active --quiet containerd; then
|
|
break
|
|
fi
|
|
sleep 1
|
|
done
|
|
systemctl is-active --quiet containerd || die "containerd did not start successfully"
|
|
|
|
# ---------- Step 10: Pre-pull Kubernetes images ----------
|
|
log "Pulling Kubernetes node images"
|
|
kubeadm config images pull
|
|
|
|
# ---------- Step 11: Clean notice if already joined ----------
|
|
if [[ -f /etc/kubernetes/kubelet.conf ]]; then
|
|
warn "This node appears to have already been joined before."
|
|
warn "If you want to re-join it cleanly, run:"
|
|
echo " sudo kubeadm reset -f"
|
|
echo " sudo rm -rf /etc/cni/net.d /var/lib/cni /var/lib/kubelet /etc/kubernetes"
|
|
echo " sudo systemctl restart containerd kubelet"
|
|
fi
|
|
|
|
# ---------- Step 12: Final status ----------
|
|
log "Worker node runtime status"
|
|
systemctl status containerd kubelet --no-pager || true
|
|
|
|
echo
|
|
echo "Worker node preparation is complete."
|
|
echo
|
|
echo "This node is ready for you to run your join command manually."
|
|
echo
|
|
echo "Example:"
|
|
echo " kubeadm join 10.28.24.43:6443 --token <token> \\"
|
|
echo " --discovery-token-ca-cert-hash sha256:<hash>"
|
|
echo
|
|
echo "After joining, verify on the control-plane node with:"
|
|
echo " kubectl get nodes"
|
|
echo |