Deploy Prowler CIS scanner as weekly CronJob on minikube-indri

Custom slim container (no PowerShell/Trivy), NFS-backed reports
on sifaka:/volume1/reports/prowler/, ClusterRole with read-only
RBAC for Kubernetes CIS Benchmark v1.11 checks.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/apps/prowler.yaml

@@ -0,0 +1,17 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: prowler
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: ssh://forgejo@forge.ops.eblu.me:2222/eblume/blumeops.git
+    targetRevision: main
+    path: argocd/manifests/prowler
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: prowler
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true

argocd/manifests/prowler/cronjob.yaml

@@ -0,0 +1,53 @@
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: prowler
+  namespace: prowler
+spec:
+  schedule: "0 3 * * 0"  # Sunday 3am
+  concurrencyPolicy: Forbid
+  jobTemplate:
+    spec:
+      ttlSecondsAfterFinished: 604800  # Auto-delete after 7 days
+      template:
+        spec:
+          serviceAccountName: prowler
+          containers:
+            - name: prowler
+              image: registry.ops.eblu.me/blumeops/prowler:kustomized
+              args:
+                - kubernetes
+                - --compliance
+                - cis_1.11_kubernetes
+                - -z
+                - --output-formats
+                - html,csv,json-ocsf
+                - --output-directory
+                - /reports
+              volumeMounts:
+                - name: reports
+                  mountPath: /reports
+                - name: var-lib-kubelet
+                  mountPath: /var/lib/kubelet
+                  readOnly: true
+                - name: etc-kubernetes
+                  mountPath: /etc/kubernetes
+                  readOnly: true
+                - name: var-lib-etcd
+                  mountPath: /var/lib/etcd
+                  readOnly: true
+          hostPID: true
+          restartPolicy: OnFailure
+          volumes:
+            - name: reports
+              persistentVolumeClaim:
+                claimName: prowler-reports
+            - name: var-lib-kubelet
+              hostPath:
+                path: /var/lib/kubelet
+            - name: etc-kubernetes
+              hostPath:
+                path: /etc/kubernetes
+            - name: var-lib-etcd
+              hostPath:
+                path: /var/lib/etcd

argocd/manifests/prowler/kustomization.yaml

@@ -0,0 +1,15 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: prowler
+
+resources:
+  - serviceaccount.yaml
+  - rbac.yaml
+  - pv-nfs.yaml
+  - pvc.yaml
+  - cronjob.yaml
+
+images:
+  - name: registry.ops.eblu.me/blumeops/prowler
+    newTag: v5.22.0-placeholder

argocd/manifests/prowler/pv-nfs.yaml

@@ -0,0 +1,22 @@
+# NFS PersistentVolume for Prowler compliance reports
+# Requires: NFS share on sifaka at /volume1/reports with NFS permissions for indri
+#
+# To create on Synology:
+# 1. Control Panel > Shared Folder > Create
+# 2. Name: reports, Location: Volume 1
+# 3. Control Panel > File Services > NFS > NFS Rules
+# 4. Add rule for "reports" share: Hostname=indri, Privilege=Read/Write, Squash=No mapping
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: prowler-reports-nfs-pv
+spec:
+  capacity:
+    storage: 10Gi
+  accessModes:
+    - ReadWriteMany
+  persistentVolumeReclaimPolicy: Retain
+  storageClassName: ""
+  nfs:
+    server: sifaka
+    path: /volume1/reports/prowler

argocd/manifests/prowler/pvc.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: prowler-reports
+  namespace: prowler
+spec:
+  accessModes:
+    - ReadWriteMany
+  storageClassName: ""
+  volumeName: prowler-reports-nfs-pv
+  resources:
+    requests:
+      storage: 10Gi

argocd/manifests/prowler/rbac.yaml

@@ -0,0 +1,24 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: prowler-reader
+rules:
+  - apiGroups: [""]
+    resources: ["pods", "configmaps", "nodes", "namespaces"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["rbac.authorization.k8s.io"]
+    resources: ["clusterroles", "clusterrolebindings", "roles", "rolebindings"]
+    verbs: ["get", "list", "watch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: prowler-reader
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: prowler-reader
+subjects:
+  - kind: ServiceAccount
+    name: prowler
+    namespace: prowler

argocd/manifests/prowler/serviceaccount.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: prowler
+  namespace: prowler

containers/prowler/Dockerfile

@@ -0,0 +1,45 @@
+# Prowler CIS scanner — slim build for Kubernetes provider only
+# Strips PowerShell (M365), Trivy (IaC), and dashboard dependencies from upstream
+ARG CONTAINER_APP_VERSION=5.22.0
+
+FROM python:3.12-slim-bookworm AS build
+
+ARG CONTAINER_APP_VERSION
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        git ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /build
+
+RUN git clone --depth 1 --branch ${CONTAINER_APP_VERSION} \
+        https://github.com/prowler-cloud/prowler.git .
+
+# Install prowler into a virtualenv so we can copy it cleanly
+RUN python -m venv /opt/prowler \
+    && /opt/prowler/bin/pip install --no-cache-dir --upgrade pip \
+    && /opt/prowler/bin/pip install --no-cache-dir .
+
+# ---
+
+FROM python:3.12-slim-bookworm
+
+ARG CONTAINER_APP_VERSION
+
+LABEL org.opencontainers.image.title="prowler"
+LABEL org.opencontainers.image.version="${CONTAINER_APP_VERSION}"
+LABEL org.opencontainers.image.source="https://forge.ops.eblu.me/eblume/blumeops"
+LABEL org.opencontainers.image.vendor="blumeops"
+LABEL org.opencontainers.image.description="Prowler CIS scanner (Kubernetes provider)"
+
+RUN addgroup --gid 1000 prowler \
+    && adduser --uid 1000 --gid 1000 --disabled-password --gecos "" prowler
+
+COPY --from=build /opt/prowler /opt/prowler
+
+ENV PATH="/opt/prowler/bin:${PATH}"
+
+USER prowler
+WORKDIR /home/prowler
+
+ENTRYPOINT ["prowler"]

docs/changelog.d/deploy-prowler.feature.md

@@ -0,0 +1 @@
+Deploy Prowler CIS scanner as a weekly CronJob on minikube-indri, with reports written to sifaka NFS share.

docs/how-to/operations/deploy-prowler.md

@@ -0,0 +1,63 @@
+---
+title: Deploy Prowler CIS Scanner
+modified: 2026-03-24
+last-reviewed: 2026-03-24
+tags:
+  - how-to
+  - kubernetes
+  - security
+  - compliance
+---
+
+# Deploy Prowler CIS Scanner
+
+Prowler runs weekly CIS Kubernetes Benchmark scans against minikube-indri and writes HTML/CSV/JSON reports to the NFS share on sifaka.
+
+## What it checks
+
+Prowler's Kubernetes provider runs ~70 checks from the CIS Kubernetes Benchmark v1.11, grouped into:
+
+| Category | Checks | How it works |
+|----------|--------|-------------|
+| **Core (pod security)** | 13 | Queries K8s API for privileged containers, hostPID/hostNetwork, capabilities, secrets in env vars, seccomp |
+| **RBAC** | 9 | Queries RBAC API for overprivileged roles, wildcard access, cluster-admin bindings |
+| **Apiserver** | 29 | Inspects `kube-apiserver` pod args in kube-system (TLS, auth, audit, admission plugins) |
+| **Etcd** | 7 | Inspects `etcd` pod args (TLS, cert auth) |
+| **Controller Manager** | 7 | Inspects `kube-controller-manager` pod args |
+| **Kubelet** | 16 | Reads kubelet-config ConfigMap + node file permissions (file checks need hostPID) |
+| **Scheduler** | 2 | Inspects `kube-scheduler` pod args |
+
+**Minikube relevance:** Most checks work because minikube runs control plane as static pods. Kubelet file permission checks return MANUAL unless Prowler runs on the node (we mount host paths to enable this).
+
+**k3s note:** k3s embeds the control plane in a single binary — no static pods exist. Only core + RBAC checks (~22 of 70) produce results. Consider `kube-bench` for k3s control plane checks.
+
+## Reports
+
+Reports are written to `sifaka:/volume1/reports/prowler/<date>/` in three formats:
+
+- **HTML** — human-readable, self-contained, filterable
+- **CSV** — flat tabular, one row per finding
+- **JSON-OCSF** — structured, for SIEM ingestion
+
+## Running an ad-hoc scan
+
+```fish
+kubectl create job --from=cronjob/prowler prowler-manual -n prowler --context=minikube-indri
+```
+
+Watch progress:
+
+```fish
+kubectl logs -f job/prowler-manual -n prowler --context=minikube-indri
+```
+
+## Container
+
+Custom slim build at `containers/prowler/Dockerfile` — strips PowerShell, Trivy, and non-Kubernetes providers from upstream. See [[build-container-image]] for the build/release process.
+
+**TODO:** Mirror prowler-cloud/prowler on forge for supply chain control.
+
+## See also
+
+- [[deploy-k8s-service]] — general K8s deployment how-to
+- [[build-container-image]] — container build pipeline

docs/reference/kubernetes/apps.md

@@ -40,6 +40,7 @@ Registry of all applications deployed via [[argocd]].
 | `forgejo-runner` | forgejo-runner | `argocd/manifests/forgejo-runner/` | [[forgejo]] CI |
 | `ollama` | ollama | `argocd/manifests/ollama/` | [[ollama]] |
 | `mealie` | mealie | `argocd/manifests/mealie/` | [[mealie]] |
+| `prowler` | prowler | `argocd/manifests/prowler/` | [[prowler]] |
 
 ## Sync Policies
 

docs/reference/services/prowler.md

@@ -0,0 +1,30 @@
+---
+title: Prowler
+modified: 2026-03-24
+last-reviewed: 2026-03-24
+tags:
+  - service
+  - security
+---
+
+# Prowler
+
+CIS Kubernetes Benchmark scanner for compliance posture reporting.
+
+## Quick Reference
+
+| Property | Value |
+|----------|-------|
+| **Namespace** | `prowler` |
+| **Image** | `registry.ops.eblu.me/blumeops/prowler` (see `argocd/manifests/prowler/kustomization.yaml` for current tag) |
+| **Schedule** | Weekly (Sunday 3am) |
+| **Reports** | `sifaka:/volume1/reports/prowler/` (NFS) |
+| **Manifests** | `argocd/manifests/prowler/` |
+
+## What it does
+
+Runs Prowler 5 as a CronJob against minikube-indri, executing CIS Kubernetes Benchmark v1.11 checks across pod security, RBAC, apiserver, etcd, kubelet, controller-manager, and scheduler. Reports are written in HTML, CSV, and JSON-OCSF to the NFS share on sifaka.
+
+## See also
+
+- [[deploy-prowler]] — deployment how-to, ad-hoc scan instructions, check relevance notes