Redis StatefulSet with VolumeClaimTemplate

redis-sts.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  labels:
    app: redis
spec:
  selector:
    matchLabels:
      role: master
      app: redis
  serviceName: "redis"
  replicas: 2
  template:
    metadata:
      labels:
        role: master
        app: redis
      annotations:
    spec:
      initContainers:
      - name: init-redis
        image: redis:4.0.9
        command:
        - bash
        - "-c"
        - |
          set -ex
          # Generate mysql server-id from pod ordinal index.
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          # Copy appropriate conf.d files from config-map to emptyDir.
          if [[ $ordinal -eq 0 ]]; then
            cp /mnt/config-map/master.conf /etc/redis.conf
          else
            cp /mnt/config-map/slave.conf /etc/redis.conf
          fi
        volumeMounts:
        - name: conf
          mountPath: /etc
          subPath: redis.conf
        - name: config-map
          mountPath: /mnt/config-map
      containers:
      - name: redis
        image: redis:4.0.9
        command: ["redis-server"]
        args: ["/etc/redis.conf"]
        env:
        - name: ALLOW_EMPTY_PASSWORD
          value: "yes"
        ports:
        - name: redis
          containerPort: 6379
        volumeMounts:
        - name: redis-data
          mountPath: /data
        - name: conf
          mountPath: /etc/
          subPath: redis.conf
      volumes:
      - name: conf
        emptyDir: {}
      - name: config-map
        configMap:
          name: redis
  volumeClaimTemplates:
    - metadata:
        name: redis-data
      spec:
        accessModes: [ "ReadWriteOnce" ]
        resources:
          requests:
            storage: 50Mi