feat: add kubernetes-reflector skill for cross-namespace secret/configmap mirroring

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-16 21:13:38 -04:00
parent 3563f311db
commit 3d38ba5a41
1 changed files with 140 additions and 0 deletions
@@ -0,0 +1,140 @@
+---
+name: kubernetes-reflector
+description: Configure Kubernetes Reflector annotations to mirror secrets and configmaps across namespaces.
+---
+
+# Kubernetes Reflector Skill
+
+Configure reflection annotations for [Kubernetes Reflector](https://github.com/emberstack/kubernetes-reflector), a Kubernetes addon that monitors changes to secrets and configmaps and reflects them to mirror resources in other namespaces.
+
+## Annotations Reference
+
+### Source Resource Annotations
+
+Apply to the **source** secret or configmap to permit reflection:
+
+| Annotation | Value | Description |
+|---|---|---|
+| `reflector.v1.k8s.emberstack.com/reflection-allowed` | `"true"` | Permit this resource to be reflected |
+| `reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces` | comma-separated namespaces or regex | Restrict which namespaces can reflect this resource. If omitted, all namespaces are allowed |
+
+**Automatic mirror creation** (optional):
+
+| Annotation | Value | Description |
+|---|---|---|
+| `reflector.v1.k8s.emberstack.com/reflection-auto-enabled` | `"true"` | Automatically create mirrors in target namespaces |
+| `reflector.v1.k8s.emberstack.com/reflection-auto-namespaces` | comma-separated namespaces or regex | Namespaces where auto-mirrors are created. If omitted, all allowed namespaces are used |
+
+### Mirror Resource Annotations
+
+Apply to the **mirror** (destination) resource:
+
+| Annotation | Value | Description |
+|---|---|---|
+| `reflector.v1.k8s.emberstack.com/reflects` | `namespace/name` | The source resource to reflect (e.g., `default/my-secret`) |
+| `reflector.v1.k8s.emberstack.com/reflected-version` | `""` | Reset to empty string to force re-reflection when manually updating the mirror |
+
+## Examples
+
+### Enable Reflection on a Source Secret
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: source-secret
+  namespace: default
+  annotations:
+    reflector.v1.k8s.emberstack.com/reflection-allowed: "true"
+    reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces: "namespace-1,namespace-2,namespace-[0-9]*"
+data:
+  ...
+```
+
+### Create a Mirror Secret
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mirror-secret
+  namespace: namespace-1
+  annotations:
+    reflector.v1.k8s.emberstack.com/reflects: "default/source-secret"
+data:
+  ...
+```
+
+### Automatic Mirroring (No Manual Mirror Creation)
+
+Annotate the source with `reflection-auto-enabled`:
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: source-secret
+  annotations:
+    reflector.v1.k8s.emberstack.com/reflection-allowed: "true"
+    reflector.v1.k8s.emberstack.com/reflection-auto-enabled: "true"
+    reflector.v1.k8s.emberstack.com/reflection-auto-namespaces: "namespace-1,namespace-2"
+```
+
+Reflector will automatically create mirrors in `namespace-1` and `namespace-2` with the same name.
+
+Reflector monitors changes to source objects and copies the following fields:
+- `data` for secrets
+- `data` and `binaryData` for configmaps
+
+Reflector tracks what was copied by annotating mirrors with the source object version.
+
+## cert-manager Integration
+
+### Certificate (v1.5+)
+
+Secrets created from certificates can enable reflection via `secretTemplate`:
+
+```yaml
+apiVersion: cert-manager.io/v1
+kind: Certificate
+...
+spec:
+  secretTemplate:
+    annotations:
+      reflector.v1.k8s.emberstack.com/reflection-allowed: "true"
+      reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces: ""
+```
+
+### Ingress (v1.15+)
+
+Ingress resources can set reflection annotations via `cert-manager.io/secret-template`:
+
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+    cert-manager.io/secret-template: |
+      {"annotations": {"reflector.v1.k8s.emberstack.com/reflection-allowed": "true", "reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces": ""}}
+```
+
+## Usage with kubectl
+
+```bash
+# Enable reflection on a source secret
+kubectl annotate secret -n <namespace> <name> \
+  reflector.v1.k8s.emberstack.com/reflection-allowed=true \
+  reflector.v1.k8s.emberstack.com/reflection-allowed-namespaces="<comma-separated-namespaces>" \
+  --overwrite
+
+# Create a mirror that reflects a source
+kubectl annotate secret -n <mirror-namespace> <mirror-name> \
+  reflector.v1.k8s.emberstack.com/reflects=<source-namespace>/<source-name> \
+  --overwrite
+
+# Force re-reflection on a mirror
+kubectl annotate secret -n <mirror-namespace> <mirror-name> \
+  reflector.v1.k8s.emberstack.com/reflected-version="" \
+  --overwrite
+```