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Kubernetes Tutorials: Statefulset with example

March 24, 2021 comments off

Statefulset example with HostPath PV

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "web-service"
  replicas: 2
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
      - name: web-container
        image: nginx:latest
        ports:
        - containerPort: 80
        volumeMounts:
        - name: data
          mountPath: /var/www/html  # Mount the volume at this path inside the container
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 1Gi
      storageClassName: manual

Statefulsets…

  • pod name
  • order
  • sticky to pvc

Statefulset example with NFS PV

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0001 
spec:
  capacity:
    storage: 1Gi 
  accessModes:
  - ReadWriteOnce 
  nfs: 
    path: /tecnotree/pv0001
    server: 172.31.14.69 
  persistentVolumeReclaimPolicy: Recycle
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0002
spec:
  capacity:
    storage: 1Gi 
  accessModes:
  - ReadWriteOnce 
  nfs: 
    path: /tecnotree/pv0002
    server: 172.31.14.69 
  persistentVolumeReclaimPolicy: Recycle
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "nginx"
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      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" ]
      resources:
        requests:
          storage: 1Gi
apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
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