Can now create a node worker
This commit is contained in:
436
alpine/rootfs-extra/opt/scripts/bootstrap-cluster.sh
Executable file
436
alpine/rootfs-extra/opt/scripts/bootstrap-cluster.sh
Executable file
@@ -0,0 +1,436 @@
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#!/bin/sh
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set -eu
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CONFIG_DIR="${CONFIG_DIR:-/opt/monok8s/config}"
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CLUSTER_ENV="${CONFIG_DIR}/cluster.env"
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KUBEADM_CONFIG_OUT="${KUBEADM_CONFIG_OUT:-/tmp/kubeadm-init.yaml}"
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log() {
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echo "[monok8s] $*"
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}
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fail() {
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echo "[monok8s] ERROR: $*" >&2
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exit 1
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}
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need_cmd() {
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command -v "$1" >/dev/null 2>&1 || fail "missing required command: $1"
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}
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require_file() {
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[ -f "$1" ] || fail "required file not found: $1"
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}
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load_config() {
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require_file "$CLUSTER_ENV"
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# shellcheck disable=SC1090
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. "$CLUSTER_ENV"
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: "${KUBERNETES_VERSION:?KUBERNETES_VERSION is required}"
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: "${NODE_NAME:?NODE_NAME is required}"
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: "${APISERVER_ADVERTISE_ADDRESS:?APISERVER_ADVERTISE_ADDRESS is required}"
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POD_SUBNET="${POD_SUBNET:-10.244.0.0/16}"
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SERVICE_SUBNET="${SERVICE_SUBNET:-10.96.0.0/12}"
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CLUSTER_NAME="${CLUSTER_NAME:-monok8s}"
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CLUSTER_DOMAIN="${CLUSTER_DOMAIN:-cluster.local}"
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CONTAINER_RUNTIME_ENDPOINT="${CONTAINER_RUNTIME_ENDPOINT:-unix:///var/run/crio/crio.sock}"
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SANS="${SANS:-}"
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ALLOW_SCHEDULING_ON_CONTROL_PLANE="${ALLOW_SCHEDULING_ON_CONTROL_PLANE:-yes}"
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SKIP_IMAGE_CHECK="${SKIP_IMAGE_CHECK:-no}"
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KUBECONFIG_USER_HOME="${KUBECONFIG_USER_HOME:-/root}"
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BOOTSTRAP_MODE="${BOOTSTRAP_MODE:-init}"
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JOIN_KIND="${JOIN_KIND:-worker}"
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API_SERVER_ENDPOINT="${API_SERVER_ENDPOINT:-}"
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BOOTSTRAP_TOKEN="${BOOTSTRAP_TOKEN:-}"
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DISCOVERY_TOKEN_CA_CERT_HASH="${DISCOVERY_TOKEN_CA_CERT_HASH:-}"
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CONTROL_PLANE_CERT_KEY="${CONTROL_PLANE_CERT_KEY:-}"
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CNI_PLUGIN="${CNI_PLUGIN:-none}"
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}
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validate_config() {
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case "$BOOTSTRAP_MODE" in
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init)
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;;
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join)
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: "${API_SERVER_ENDPOINT:?API_SERVER_ENDPOINT is required for join mode}"
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: "${BOOTSTRAP_TOKEN:?BOOTSTRAP_TOKEN is required for join mode}"
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: "${DISCOVERY_TOKEN_CA_CERT_HASH:?DISCOVERY_TOKEN_CA_CERT_HASH is required for join mode}"
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case "$JOIN_KIND" in
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worker|control-plane)
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;;
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*)
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fail "JOIN_KIND must be 'worker' or 'control-plane'"
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;;
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esac
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if [ "$JOIN_KIND" = "control-plane" ]; then
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: "${CONTROL_PLANE_CERT_KEY:?CONTROL_PLANE_CERT_KEY is required for JOIN_KIND=control-plane}"
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fi
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;;
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*)
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fail "BOOTSTRAP_MODE must be 'init' or 'join'"
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;;
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esac
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}
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check_prereqs() {
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need_cmd kubeadm
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need_cmd kubelet
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need_cmd kubectl
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need_cmd crictl
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need_cmd rc-service
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need_cmd awk
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need_cmd ip
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need_cmd grep
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need_cmd sed
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need_cmd hostname
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}
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check_apiserver_reachable() {
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host="${API_SERVER_ENDPOINT%:*}"
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port="${API_SERVER_ENDPOINT##*:}"
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need_cmd nc
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log "checking API server reachability: ${host}:${port}"
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for _ in $(seq 1 20); do
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if nc -z "$host" "$port" >/dev/null 2>&1; then
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log "API server is reachable"
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return 0
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fi
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sleep 1
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done
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fail "cannot reach API server at ${host}:${port}"
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}
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start_crio() {
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rc-service crio start
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}
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check_crio_running() {
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log "waiting for CRI-O to become ready..."
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last_status="unknown"
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for _ in $(seq 1 30); do
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if rc-service crio status >/dev/null 2>&1; then
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last_status="service-running"
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if crictl --runtime-endpoint "$CONTAINER_RUNTIME_ENDPOINT" info >/dev/null 2>&1; then
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log "CRI-O is up"
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return 0
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fi
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last_status="service-running-but-runtime-not-ready"
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else
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last_status="service-not-running"
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fi
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sleep 1
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done
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fail "CRI-O did not become ready in time (${last_status})"
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}
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image_present() {
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wanted="$1"
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repo="${wanted%:*}"
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tag="${wanted##*:}"
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crictl --runtime-endpoint "$CONTAINER_RUNTIME_ENDPOINT" images \
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| awk 'NR>1 { print $1 ":" $2 }' \
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| grep -Fx "$repo:$tag" >/dev/null 2>&1
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}
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check_required_images() {
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[ "$SKIP_IMAGE_CHECK" = "yes" ] && {
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log "skipping image check (SKIP_IMAGE_CHECK=yes)"
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return 0
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}
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log "checking required Kubernetes images for $KUBERNETES_VERSION..."
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missing_any=0
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for img in $(kubeadm config images list --kubernetes-version "$KUBERNETES_VERSION"); do
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if image_present "$img"; then
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log "found image: $img"
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else
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echo "[monok8s] MISSING image: $img" >&2
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missing_any=1
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fi
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done
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[ "$missing_any" -eq 0 ] || fail "preload the Kubernetes images before bootstrapping"
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log "all required images are present"
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}
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check_not_already_bootstrapped() {
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case "$BOOTSTRAP_MODE" in
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init)
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if [ -f /etc/kubernetes/admin.conf ]; then
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fail "cluster already appears initialized (/etc/kubernetes/admin.conf exists)"
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fi
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;;
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join)
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if [ -f /etc/kubernetes/kubelet.conf ]; then
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fail "node already appears joined (/etc/kubernetes/kubelet.conf exists)"
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fi
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;;
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esac
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}
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run_kubeadm_join() {
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log "running kubeadm join..."
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case "$JOIN_KIND" in
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worker)
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kubeadm join "${API_SERVER_ENDPOINT}" \
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--token "${BOOTSTRAP_TOKEN}" \
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--discovery-token-ca-cert-hash "${DISCOVERY_TOKEN_CA_CERT_HASH}" \
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--node-name "${NODE_NAME}" \
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--cri-socket "${CONTAINER_RUNTIME_ENDPOINT}"
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;;
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control-plane)
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kubeadm join "${API_SERVER_ENDPOINT}" \
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--token "${BOOTSTRAP_TOKEN}" \
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--discovery-token-ca-cert-hash "${DISCOVERY_TOKEN_CA_CERT_HASH}" \
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--control-plane \
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--certificate-key "${CONTROL_PLANE_CERT_KEY}" \
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--apiserver-advertise-address "${APISERVER_ADVERTISE_ADDRESS}" \
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--node-name "${NODE_NAME}" \
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--cri-socket "${CONTAINER_RUNTIME_ENDPOINT}"
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;;
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esac
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}
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generate_kubeadm_config() {
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log "generating kubeadm config at $KUBEADM_CONFIG_OUT..."
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SAN_LINES=""
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if [ -n "${SANS:-}" ]; then
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old_ifs="$IFS"
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IFS=','
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for san in $SANS; do
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san_trimmed="$(echo "$san" | sed 's/^ *//;s/ *$//')"
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[ -n "$san_trimmed" ] && SAN_LINES="${SAN_LINES} - \"${san_trimmed}\"
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"
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done
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IFS="$old_ifs"
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fi
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cat > "$KUBEADM_CONFIG_OUT" <<EOF
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apiVersion: kubeadm.k8s.io/v1beta4
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kind: InitConfiguration
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localAPIEndpoint:
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advertiseAddress: ${APISERVER_ADVERTISE_ADDRESS}
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bindPort: 6443
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nodeRegistration:
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name: ${NODE_NAME}
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criSocket: ${CONTAINER_RUNTIME_ENDPOINT}
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imagePullPolicy: IfNotPresent
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kubeletExtraArgs:
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- name: hostname-override
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value: "${NODE_NAME}"
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- name: node-ip
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value: "${APISERVER_ADVERTISE_ADDRESS}"
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- name: pod-manifest-path
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value: "/etc/kubernetes/manifests"
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---
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apiVersion: kubeadm.k8s.io/v1beta4
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kind: ClusterConfiguration
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clusterName: ${CLUSTER_NAME}
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kubernetesVersion: ${KUBERNETES_VERSION}
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networking:
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podSubnet: ${POD_SUBNET}
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serviceSubnet: ${SERVICE_SUBNET}
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dnsDomain: ${CLUSTER_DOMAIN}
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apiServer:
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certSANs:
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- "${APISERVER_ADVERTISE_ADDRESS}"
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${SAN_LINES}---
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apiVersion: kubelet.config.k8s.io/v1beta1
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kind: KubeletConfiguration
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cgroupDriver: cgroupfs
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containerRuntimeEndpoint: ${CONTAINER_RUNTIME_ENDPOINT}
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EOF
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}
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run_kubeadm_init() {
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log "running kubeadm init..."
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kubeadm init --config "$KUBEADM_CONFIG_OUT"
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}
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require_local_ip() {
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wanted_ip="$1"
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ip -o addr show | awk '{print $4}' | cut -d/ -f1 | grep -Fx "$wanted_ip" >/dev/null 2>&1 \
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|| fail "required local IP is not present on any interface: $wanted_ip"
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}
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validate_network_requirements() {
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case "$BOOTSTRAP_MODE" in
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init)
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require_local_ip "$APISERVER_ADVERTISE_ADDRESS"
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;;
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join)
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require_local_ip "$APISERVER_ADVERTISE_ADDRESS"
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check_apiserver_reachable
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;;
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*)
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fail "unsupported BOOTSTRAP_MODE: $BOOTSTRAP_MODE"
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;;
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esac
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}
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setup_local_kubectl() {
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kube_dir="${KUBECONFIG_USER_HOME}/.kube"
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log "setting up local kubectl config in ${kube_dir}/config..."
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mkdir -p "$kube_dir"
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cp /etc/kubernetes/admin.conf "${kube_dir}/config"
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chmod 600 "${kube_dir}/config"
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if [ "$KUBECONFIG_USER_HOME" = "/root" ]; then
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mkdir -p /etc/profile.d
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cat > /etc/profile.d/kubeconfig.sh <<'EOF'
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export KUBECONFIG=/root/.kube/config
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EOF
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chmod 644 /etc/profile.d/kubeconfig.sh
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fi
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}
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wait_for_node() {
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log "waiting for node registration: $NODE_NAME"
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for _ in $(seq 1 60); do
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if kubectl --kubeconfig /etc/kubernetes/admin.conf get node "$NODE_NAME" >/dev/null 2>&1; then
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return 0
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fi
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sleep 1
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done
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fail "node $NODE_NAME did not register in time"
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}
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apply_local_node_metadata_if_possible() {
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if [ "$BOOTSTRAP_MODE" != "init" ]; then
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log "skipping node labels/annotations from this node (not control-plane init mode)"
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return 0
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fi
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wait_for_node
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if [ -n "${NODE_ANNOTATIONS:-}" ]; then
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kubectl --kubeconfig /etc/kubernetes/admin.conf annotate node "$NODE_NAME" $(printf '%s' "$NODE_ANNOTATIONS" | tr ',' ' ') --overwrite
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fi
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if [ -n "${NODE_LABELS:-}" ]; then
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kubectl --kubeconfig /etc/kubernetes/admin.conf label node "$NODE_NAME" $(printf '%s' "$NODE_LABELS" | tr ',' ' ') --overwrite
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fi
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}
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install_cni_if_requested() {
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case "${CNI_PLUGIN}" in
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none)
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if [ -f /etc/cni/net.d/10-crio-bridge.conflist ]; then
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mv /etc/cni/net.d/10-crio-bridge.conflist \
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/etc/cni/net.d/10-crio-bridge.conflist.disabled
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fi
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log "bootstrap bridge CNI disabled; install a cluster CNI (e.g., flannel) for pod networking"
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;;
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bridge)
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if [ -f /etc/cni/net.d/10-crio-bridge.conflist.disabled ]; then
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mv /etc/cni/net.d/10-crio-bridge.conflist.disabled \
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/etc/cni/net.d/10-crio-bridge.conflist
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fi
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log "bootstrap bridge CNI enabled"
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;;
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*)
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fail "unsupported CNI_PLUGIN: ${CNI_PLUGIN}"
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;;
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esac
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}
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allow_single_node_scheduling() {
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if [ "$ALLOW_SCHEDULING_ON_CONTROL_PLANE" != "yes" ]; then
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log "leaving control-plane taint in place"
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return 0
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fi
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log "removing control-plane taint so this single node can schedule workloads..."
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kubectl --kubeconfig /etc/kubernetes/admin.conf taint nodes "$NODE_NAME" node-role.kubernetes.io/control-plane- >/dev/null 2>&1 || true
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}
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print_next_steps() {
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echo
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echo "[monok8s] bootstrap complete"
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echo
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case "$BOOTSTRAP_MODE" in
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init)
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cat <<EOF
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Try these now:
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export KUBECONFIG=/root/.kube/config
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kubectl get nodes -o wide
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kubectl describe nodes
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Notes:
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- On a fresh cluster without a CNI, nodes may stay NotReady.
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- If you want pods to run on this same node, keep ALLOW_SCHEDULING_ON_CONTROL_PLANE=yes.
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EOF
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;;
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join)
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cat <<EOF
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This node has attempted to join the cluster.
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Check from the control-plane node:
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kubectl get nodes -o wide
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kubectl describe node ${NODE_NAME}
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Notes:
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- This node can join without a CNI.
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- Without a cluster CNI, the node may remain NotReady.
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EOF
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;;
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esac
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}
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main() {
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load_config
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validate_config
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check_prereqs
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validate_network_requirements
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check_not_already_bootstrapped
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install_cni_if_requested
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start_crio
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check_crio_running
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|
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case "$BOOTSTRAP_MODE" in
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init)
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check_required_images
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generate_kubeadm_config
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||||
run_kubeadm_init
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rc-service kubelet restart
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setup_local_kubectl
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apply_local_node_metadata_if_possible
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allow_single_node_scheduling
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;;
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join)
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run_kubeadm_join
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;;
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||||
esac
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||||
|
||||
print_next_steps
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}
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||||
|
||||
main "$@"
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||||
Reference in New Issue
Block a user