StatefulSet without service name

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Metadata

Id: bb241e61-77c3-4b97-9575-c0f8a1e008d0

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Low

Category: Availability

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Description

StatefulSets should reference an existing headless Service via spec.serviceName. The referenced Service must be headless (spec.clusterIP set to “None”) and located in the same namespace. All selector labels defined on the Service must be present on the StatefulSet pod template labels so the Service can target the StatefulSet’s pods.

Compliant Code Examples

#this is a problematic code where the query should report a result(s)
apiVersion: v1
kind: Service
metadata:
  name: nginx2
  namespace: nginx2
  labels:
    app: nginx2
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx2
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web2
  namespace: nginx2
spec:
  selector:
    matchLabels:
      app: nginx2
  serviceName: "nginx2"
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx2
        foo: bar
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx2
        image: k8s.gcr.io/nginx-slim:0.8
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "my-storage-class"
      resources:
        requests:
          storage: 1Gi

Non-Compliant Code Examples

#this is a problematic code where the query should report a result(s)
apiVersion: v1
kind: Service
metadata:
  name: nginx
  namespace: nginx
  labels:
    app: nginx2
spec:
  ports:
  - port: 80
    name: web
  clusterIP: All
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
  namespace: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  serviceName: "nginx"
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: k8s.gcr.io/nginx-slim:0.8
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "my-storage-class"
      resources:
        requests:
          storage: 1Gi