K8S StorageClass搭建

# StorageClass

## 创建ServiceAccount

现在的 Kubernetes 集群大部分是基于 [RBAC](https://so.csdn.net/so/search?q=RBAC&spm=1001.2101.3001.7020) 的权限控制，所以我们需要创建一个拥有一定权限的 ServiceAccount 与后面要部署的 NFS Subdir Externa Provisioner 组件绑定。

```yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  namespace: srs-prd
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-client-provisioner-runner
rules:
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "delete"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims"]
    verbs: ["get", "list", "watch", "update"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["events"]
    verbs: ["create", "update", "patch"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-client-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    namespace: srs-prd
roleRef:
  kind: ClusterRole
  name: nfs-client-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  namespace: srs-prd
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  namespace: srs-prd
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    namespace: srs-prd
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io

```

## 部署NFS-Subdir-External-Provisioner

```shell
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-client-provisioner
  namespace: srs-prd
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nfs-client-provisioner
  strategy:
    type: Recreate        #设置升级策略为删除再创建(默认为滚动更新)
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-client-provisioner  #上一步创建的ServiceAccount名称
      containers:
        - name: nfs-client-provisioner
          image: harbor.tqsys.cn/public/nfs-subdir-external-provisioner:v4.0.0
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME  # Provisioner的名称,以后设置的storageclass要和这个保持一致
              value: aly-nas
            - name: NFS_SERVER        # NFS服务器地址,需和valumes参数中配置的保持一致
              value: 148e54a1d7-bda50.cn-beijing.nas.aliyuncs.com
            - name: NFS_PATH          # NFS服务器数据存储目录,需和valumes参数中配置的保持一致
              value: /k8s-prd
            - name: ENABLE_LEADER_ELECTION
              value: "true"
      volumes:
        - name: nfs-client-root
          nfs:
            server: 148e54a1d7-bda50.cn-beijing.nas.aliyuncs.com        # NFS服务器地址
            path: /k8s-prd       # NFS共享目录

```

## **创建 NFS StorageClass**

我们在创建 PVC 时经常需要指定 storageClassName 名称，这个参数配置的就是一个 StorageClass 资源名称，PVC 通过指定该参数来选择使用哪个 StorageClass，并与其关联的 Provisioner 组件来动态创建 PV 资源。所以，这里我们需要提前创建一个 Storagelcass 资源。

创建nfs-storageclass.yaml

```yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  namespace: srs-prd
  name: aly-nas-storageclass
  annotations:
    storageclass.kubernetes.io/is-default-class: "false"  ## 是否设置为默认的storageclass
provisioner: aly-nas                                  ## 动态卷分配者名称，必须和上面创建的deploy中环境变量“PROVISIONER_NAME”变量值一致
parameters:
  archiveOnDelete: "true"                                 ## 设置为"false"时删除PVC不会保留数据,"true"则保留数据
mountOptions: 
  - hard                                                  ## 指定为硬挂载方式
  - nfsvers=3                                             ## 指定NFS版本,这个需要根据NFS Server版本号设置
```

## 测试

```shell
#创建storage-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: storage-pvc
  namespace: srs-prd
spec:
  storageClassName: aly-nas-storageclass   ## 需要与上面创建的storageclass的名称一致
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Mi

```

```shell
sudo mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 148e54a1d7-bda50.cn-beijing.nas.aliyuncs.com:/ /k8s-nfs

mount -t nfs -o hard,nfsvers=4 148e54a1d7-bda50.cn-beijing.nas.aliyuncs.com:/k8s-prd/srs-prd-redis-data-redis-master-0-pvc-f2e8b7dc-7add-495e-9f4f-0de81647c7bb /var/lib/kubelet/pods/52ebb577-38e3-4253-991d-18116cfdf65d/volumes/kubernetes.io~nfs/pvc-f2e8b7dc-7add-495e-9f4f-0de81647c7bb

```