Cloud Paralleled File System (CPFS) is a parallel file system. CPFS stores data across multiple data nodes in a cluster and allows data to be simultaneously accessed by multiple clients. Therefore, it can provide data storage services with high IOPS, high throughput, and low latency for large-scale, high-performance computing clusters. This topic describes how to mount and use a CPFS volume.

Background information

Container Service for Kubernetes allows you to mount CPFS volumes in static or dynamic manner. To mount a static volume, you need to manually create a PV and a PVC. This procedure can be time consuming when large numbers of PVs and PVCs are required. In this case, you can dynamically mount CPFS volumes. This topic describes how to use alibaba-cloud-csi-driver to mount CPFS volumes. For more information, see alibaba-cloud-csi-driver.

  1. Deploy the cpfs-plugin component.
    To mount CPFS volumes, take the following steps to deploy the cpfs-plugin component in the target cluster first. 
    apiVersion: storage.k8s.io/v1beta1
kind: CSIDriver
metadata:
  name: cpfsplugin.csi.alibabacloud.com
spec:
  attachRequired: false
  podInfoOnMount: true
---
# This YAML defines all API objects to create RBAC roles for csi node plugin.
kind: DaemonSet
apiVersion: apps/v1beta2
metadata:
  name: csi-cpfsplugin
  namespace: kube-system
spec:
  selector:
    matchLabels:
      app: csi-cpfsplugin
  template:
    metadata:
      labels:
        app: csi-cpfsplugin
    spec:
      tolerations:
      - operator: Exists
      priorityClassName: system-node-critical
      serviceAccount: admin
      hostNetwork: true
      hostPID: true
      containers:
      - name: driver-registrar
        image: registry.cn-hangzhou.aliyuncs.com/acs/csi-node-driver-registrar:v1.2.0
        imagePullPolicy: Always
        args:
        - "--v=5"
        - "--csi-address=/var/lib/kubelet/csi-plugins/cpfsplugin.csi.alibabacloud.com/csi.sock"
        - "--kubelet-registration-path=/var/lib/kubelet/csi-plugins/cpfsplugin.csi.alibabacloud.com/csi.sock"
        volumeMounts:
        - name: kubelet-dir
          mountPath: /var/lib/kubelet/
        - name: registration-dir
          mountPath: /registration

      - name: csi-cpfsplugin
        securityContext:
          privileged: true
          capabilities:
            add: ["SYS_ADMIN"]
          allowPrivilegeEscalation: true
        image: registry.cn-hangzhou.aliyuncs.com/acs/csi-cpfsplugin:v1.16.6-d539237c
        imagePullPolicy: "Always"
        args:
        - "--endpoint=$(CSI_ENDPOINT)"
        - "--v=5"
        - "--driver=cpfsplugin.csi.alibabacloud.com"
        env:
        - name: CSI_ENDPOINT
          value: unix://var/lib/kubelet/csi-plugins/cpfsplugin.csi.alibabacloud.com/csi.sock
        volumeMounts:
        - name: kubelet-dir
          mountPath: /var/lib/kubelet/
          mountPropagation: "Bidirectional"
        - mountPath: /var/log/
          name: host-log
        - name: etc
          mountPath: /host/etc
      volumes:
      - name: kubelet-dir
        hostPath:
          path: /var/lib/kubelet/
          type: Directory
      - name: registration-dir
        hostPath:
          path: /var/lib/kubelet/plugins_registry
          type: DirectoryOrCreate
      - name: host-log
        hostPath:
          path: /var/log/
      - name: etc
        hostPath:
          path: /etc
  updateStrategy:
    type: RollingUpdate
    Run the following command to check the plug-in status. 
    # kubectl get pod -nkube-system |grep cpfs
csi-cpfsplugin-8t585                               2/2     Running   0          4h43m
csi-cpfsplugin-9z5xj                               2/2     Running   0          4h43m
csi-cpfsplugin-bdm22                               2/2     Running   0          4h43m
csi-cpfsplugin-bjnlx                               2/2     Running   0          4h44m
csi-cpfsplugin-nv7vg                               2/2     Running   0          4h43m
csi-cpfsplugin-zc7z5                               2/2     Running   0          4h43m
  2. Use a CPFS volume.
    1. Create a CPFS file system. For more information, see Create a file system.
      Obtain the mount point URL of the NAS instance. In the following figure, file-system-id.region.nas.aliyuncs.com in the Mount Command column is the URL of the mount point.NAS
      Note file-system-id.region.nas.aliyuncs.com is the URL of the mount point. To obtain the mount point URL, log on to the NAS console, click the name of the target file system, and choose Mounting Usage.
    2. Create a PV and a PVC.
      Use the following templates to create a PV and a PVC based on the CPFS file system. 
      apiVersion: v1
kind: PersistentVolume
metadata:
  name: cpfs-csi-pv
  labels:
    alicloud-pvname: cpfs-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: cpfsplugin.csi.alibabacloud.com
    volumeHandle: cpfs-csi-pv
    volumeAttributes:
      server: "xxxxxx@tcp:xxxxxx@tcp"
      fileSystem: "xxxxxx"
      subPath: "/k8s"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: cpfs-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  selector:
    matchLabels:
      alicloud-pvname: cpfs-pv
    3. Create a deployment.
      Use the following template to create a deployment that consumes the preceding PVC. 
      ---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment-cpfs
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
        volumeMounts:
          - name: cpfs-pvc
            mountPath: "/data"
      volumes:
        - name: cpfs-pvc
          persistentVolumeClaim:
            claimName: cpfs-pvc