（k8s）Kubernetes本地存储接入

hostpath也是本地存储，为什么要使用local模式的存储呢？

因为创建deployment时，无需指定调度具体节点。会自动调度到pv所在的节点运行。

Tip：local模式存储节点异常后，意味着pod启动不起来

1、创建local模式存储类

$ cat <<EOF | kubectl apply -f -
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
EOF

2、创建pv

$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolume
metadata:
  name: test
spec:
  capacity:
    storage: 10Gi
  volumeMode: Filesystem
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local:
    path: /data/test-local-pv
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - k8s-node01
EOF

3、创建pvc

$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: test-local-pvc
  namespace: default
spec:
  storageClassName: local-storage
  volumeMode: Filesystem
  accessModes: 
  - ReadWriteOnce
  resources:
    requests:
      storage: 10G
EOF

Tip：local模式存储，创建好pv和pvc并不会马上绑定。因为local模式的存储类volumeBindingMode 的值必须是 WaitForFirstConsumer ，所以只有当pod使用pvc时，pv和pvc才进行绑定的。

4、创建业务容器并挂载

$ cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tools
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tools
  template:
    metadata:
      labels:
        app: tools
    spec:
      containers:
      - name: tools
        image: registry.cn-guangzhou.aliyuncs.com/jiaxzeng6918/tools:v1.1
        volumeMounts:
        - name: data
          mountPath: /data
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: test-local-pvc
EOF

5、查看运行pod运行节点

$ kubectl get pod -owide
NAME                     READY   STATUS    RESTARTS   AGE     IP             NODE         NOMINATED NODE   READINESS GATES
tools-6f6f7cd4bf-jjlbg   1/1     Running   0          3m16s   10.244.0.209   k8s-node01   <none>           <none>

6、验证pod是否挂载成功

$ kubectl exec -it tools-6f6f7cd4bf-jjlbg -- df -h /data
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda3        62G  4.1G   58G   7% /data

Tip：local模式存储不能限制存储大小