statefulset.yaml

kind: Service
apiVersion: v1
metadata:
  name: redis
  labels:
    app: redis
spec:
  selector:
    app: redis
  ports:
  - name: redis
    port: 6379
    targetPort: redis

---
kind: StatefulSet
apiVersion: apps/v1
metadata:
  name: redis
  labels:
    app: redis
spec:
  replicas: 3
  serviceName: redis
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      initContainers:
      - name: init
        image: redis
        command:
        - /bin/bash
        - "-c"
        - |
          redis-server &
          sleep 1s
          redis-cli set hostname $${HOSTNAME}
          redis-cli shutdown
        volumeMounts:
        - name: data
          mountPath: /data
      containers:
      - name: redis
        image: redis
        ports:
        - containerPort: 6379
          name: redis
        volumeMounts:
        - name: data
          mountPath: /data
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 10Gi

---
kind: Service
apiVersion: v1
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  selector:
    app: nginx
  ports:
  - name: http
    port: 80
    targetPort: http

---
kind: StatefulSet
apiVersion: apps/v1
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  replicas: 3
  serviceName: nginx
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      initContainers:
      - name: init
        image: alpine
        command:
        - /bin/sh
        - "-c"
        - |
          echo "hello $${HOSTNAME}" > /www/index.html
        volumeMounts:
        - name: www
          mountPath: /www
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
          name: http
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 10Gi

---
kind: Pod
apiVersion: v1
metadata:
  name: curl
  labels:
    app: curl
spec:
  restartPolicy: Never
  containers:
  - name: curl
    image: appropriate/curl
    command:
    - /bin/sh
    - "-c"
    - |
      while : ; do
        curl --silent nginx.default
        sleep 0.5s
      done

---
kind: Pod
apiVersion: v1
metadata:
  name: redis-cli
  labels:
    app: redis-cli
spec:
  restartPolicy: Never
  containers:
  - name: redis-cli
    image: redis
    command:
    - /bin/bash
    - "-c"
    - |
      while : ; do
        redis-cli -h redis get hostname
        sleep 0.5s
      done