Label worker nodes before Prometheus migration

README.md

@@ -210,6 +210,8 @@ duplicate those PV manifests when you want storage on another node.
 
 `bootstrap/cluster` labels nodes with homelab placement metadata:
 
+- `node-role.kubernetes.io/worker=worker` on every worker so `kubectl get nodes`
+  shows `worker` instead of `<none>` in the ROLES column
 - `homelab.dev/node-role=control-plane` and `homelab.dev/storage=local` on the
   Debian control plane
 - `homelab.dev/node-role=edge-app` and `homelab.dev/storage=local` on the
@@ -230,9 +232,9 @@ default `prometheus_stack_node_selector` (`homelab.dev/node-role=app` and
 `homelab.dev/storage=nvme`). Because the Prometheus, Alertmanager, and Grafana
 PVCs use retained local OpenEBS volumes, moving an existing install off the
 Debian control plane requires discarding those PVCs. Run
-`./lab.sh move-prometheus-stack-workers` from the Debian host to destroy only
-the existing `prometheus-stack` Helm release, delete its retained PVC/PV objects,
-and recreate the stack on the worker selector.
+`./lab.sh move-prometheus-stack-workers` from the Debian host to label existing
+worker nodes, destroy only the existing `prometheus-stack` Helm release, delete
+its retained PVC/PV objects, and recreate the stack on the worker selector.
 
 The website and demos NodePorts are reachable from the OCI jump box through the
 Raspberry Pi Tailscale interface. `bootstrap/cluster` installs a persistent

lab.sh

@@ -174,6 +174,49 @@ adopt_apps_existing_resources() {
         "demos-static"
 }
 
+ensure_homelab_node_labels() {
+    local control_plane_node="${LAB_CONTROL_PLANE_NODE_NAME:-debian}"
+    local raspberry_node="${LAB_RASPBERRY_NODE_NAME:-raspberry}"
+    local prometheus_selector="homelab.dev/node-role=app,homelab.dev/storage=nvme"
+    local node
+    local target_nodes
+
+    echo "Applying homelab labels to existing Kubernetes nodes..."
+    while IFS= read -r node; do
+        [[ -n "${node}" ]] || continue
+
+        if [[ "${node}" == "${control_plane_node}" ]]; then
+            kubectl --kubeconfig "${KUBECONFIG_PATH}" label node "${node}" \
+                homelab.dev/node-role=control-plane \
+                homelab.dev/storage=local \
+                --overwrite
+            continue
+        fi
+
+        kubectl --kubeconfig "${KUBECONFIG_PATH}" label node "${node}" \
+            node-role.kubernetes.io/worker=worker \
+            --overwrite
+
+        if [[ "${node}" == pimox-worker-* ]]; then
+            kubectl --kubeconfig "${KUBECONFIG_PATH}" label node "${node}" \
+                homelab.dev/node-role=app \
+                homelab.dev/storage=nvme \
+                --overwrite
+        elif [[ "${node}" == "${raspberry_node}" ]]; then
+            kubectl --kubeconfig "${KUBECONFIG_PATH}" label node "${node}" \
+                homelab.dev/node-role=edge-app \
+                homelab.dev/storage=local \
+                --overwrite
+        fi
+    done < <(kubectl --kubeconfig "${KUBECONFIG_PATH}" get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}')
+
+    target_nodes="$(kubectl --kubeconfig "${KUBECONFIG_PATH}" get nodes -l "${prometheus_selector}" -o name)"
+    if [[ -z "${target_nodes}" ]]; then
+        echo "No nodes match ${prometheus_selector}; refusing to move prometheus-stack." >&2
+        exit 1
+    fi
+}
+
 delete_prometheus_stack_storage() {
     local namespace="${1:-monitoring}"
     local pattern='(^|-)prometheus-stack-(prometheus|alertmanager|grafana)(-|$)|^prometheus-prometheus-stack|^alertmanager-prometheus-stack|^storage-prometheus-stack-grafana'
@@ -227,6 +270,7 @@ move_prometheus_stack_workers() {
     export KUBECONFIG="${TF_VAR_kubeconfig_path}"
 
     echo "Moving prometheus-stack off the control plane. Existing prometheus-stack PVC data will be deleted."
+    ensure_homelab_node_labels
     tofu -chdir="${REPO_ROOT}/${stack}" init
     adopt_platform_existing_resources
     tofu -chdir="${REPO_ROOT}/${stack}" destroy -target=helm_release.prometheus_stack -auto-approve
@@ -647,8 +691,8 @@ write_cluster_worker_var_file() {
     LAB_RASPBERRY_USER="${LAB_RASPBERRY_USER:-jv}" \
     LAB_RASPBERRY_NODE_NAME="${LAB_RASPBERRY_NODE_NAME:-raspberry}" \
     LAB_RASPBERRY_SSH_KEY_PATH="${LAB_RASPBERRY_SSH_KEY_PATH:-/home/jv/.ssh/id_ed25519}" \
-    LAB_RASPBERRY_NODE_LABELS_JSON="${LAB_RASPBERRY_NODE_LABELS_JSON:-{\"homelab.dev/node-role\":\"edge-app\",\"homelab.dev/storage\":\"local\"}}" \
-    LAB_PIMOX_WORKER_NODE_LABELS_JSON="${LAB_PIMOX_WORKER_NODE_LABELS_JSON:-{\"homelab.dev/node-role\":\"app\",\"homelab.dev/storage\":\"nvme\"}}" \
+    LAB_RASPBERRY_NODE_LABELS_JSON="${LAB_RASPBERRY_NODE_LABELS_JSON:-{\"node-role.kubernetes.io/worker\":\"worker\",\"homelab.dev/node-role\":\"edge-app\",\"homelab.dev/storage\":\"local\"}}" \
+    LAB_PIMOX_WORKER_NODE_LABELS_JSON="${LAB_PIMOX_WORKER_NODE_LABELS_JSON:-{\"node-role.kubernetes.io/worker\":\"worker\",\"homelab.dev/node-role\":\"app\",\"homelab.dev/storage\":\"nvme\"}}" \
         python3 - "${spec_file}" "${var_file}" <<'PY'
 import json
 import os