使用Local Persistent Volume 部署有状态工作负载

本教程以部署Demo StatefulSet为例，指导您利用 LocalPersistentVolume (即本地持久卷)技术使用标准 PVC 对象访问本地磁盘。

安装kubernetes集群

略，可参考官方文档

创建WaitForFirstConsumer 绑定模式的StorageClass

此模式指示 Kubernetes 延迟PVC的绑定，直到有Pod使用为止。

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

在对应的主机上准备卷

kubernetes003主机

mkdir -p /data/volumes/pv0
chmod 777 /data/volumes/pv0

kubernetes002主机

mkdir -p /data/volumes/pv1
chmod 777 /data/volumes/pv1

创建两个LocalPersistentVolume

注意，pv和host节点进行亲和处理，这是为了让k8s把对应的pod调度到对应的卷

apiVersion: v1
kind: PersistentVolume
metadata:
  name: test-local-pv-0
spec:
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /data/volumes/pv0
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - kubernetes003

apiVersion: v1
kind: PersistentVolume
metadata:
  name: test-local-pv-1
spec:
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /data/volumes/pv1
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - kubernetes002

创建两个pvc

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-pvc-busybox-0
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  volumeName: test-local-pv-0
  resources:
    requests:
      storage: 10Gi

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-pvc-busybox-1
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  volumeName: test-local-pv-1
  resources:
    requests:
      storage: 10Gi

创建ZooKeeper StatefulSet

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: busybox
  labels:
    app: busybox
spec:
  replicas: 2
  selector:
    matchLabels:
      app: busybox
  serviceName: "busybox"
  template:
    metadata:
      labels:
        app: busybox
    spec:
      containers:
      - name: busybox
        image: busybox
        command: ['sh', '-c', 'echo "The local volume is mounted!" > /mnt/test.txt && sleep 3600']
        imagePullPolicy: Always
        volumeMounts:
        - name: test-pvc
          mountPath: /mnt
  volumeClaimTemplates:
    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: test-pvc
    spec:
      storageClassName: local-storage