block2.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  namespace: default
  name: zk

# StatefulSet spec
spec:
  serviceName: zk-hs
  selector:
    matchLabels:
      app: zk # It has to match .spec.template.metadata.labels
  replicas: 5
  podManagementPolicy: OrderedReady
  updateStrategy:
    type: RollingUpdate

  # volumeClaimTemplates creates a Persistent Volume for each StatefulSet Pods.
  volumeClaimTemplates:
  - metadata:
      name: datadir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: standard
      resources:
        requests:
          storage: 10Gi

  # Pod spec
  template:
    metadata:
      labels:
        app: zk
    spec:
      affinity:
        nodeAffinity:
          ...
        podAntiAffinity:
          ...
      # Containers running in each Pod
      containers:
      - name: k8szk
        image: gcr.io/google_samples/k8szk:v3
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        env:
        ...
        readinessProbe:
          exec:
            command:
            - "zkOk.sh"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          ...
        volumeMounts:
        - name: datadir
          mountPath: /var/lib/zookeeper