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    CFS-CSI

    Last updated: 2024-02-01 10:05:00
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      Overview

      Add-on description

      The Kubernetes-csi-tencentcloud CFS-CSI plug-in allows you to use Tencent Cloud File Storage in your TKE cluster.
      Note:
      For clusters of version 1.12, you need to modify the kubelet configuration by adding \\--feature-gates=KubeletPluginsWatcher=false\\.

      Kubernetes objects deployed in a cluster

      Kubernetes Object Name
      Type
      Default Resource Occupation
      Namespace
      csi-provisioner-cfsplugin
      StatefulSet
      -
      kube-system
      csi-nodeplugin-cfsplugin
      DaemonSet
      -
      kube-system
      csi-provisioner-cfsplugin
      Service
      1C2G
      kube-system

      Use Cases

      Cloud File Storage (CFS) provides a scalable shared file storage service that can be used with Tencent Cloud services such as CVM, TKE, and BatchCompute. CFS offers standard NFS and CIFS/SMB file system access protocols to provide shared data sources for multiple CVM instances or other computing services. It supports elastic capacity expansion and performance scaling. CFS can be mounted on existing applications without modification. As a highly available and reliable distributed file system, CFS is suitable for various scenarios such as big data analysis, media processing, and content management.
      CFS is easy to integrate. You do not need to adjust your business structure or make complex configurations. You can integrate and use CFS in three steps: create a file system, launch a file system client on the server, and mount the created file system. With the CFS-CSI add-on, you can quickly use CFS through the standard native Kubernetes in your TKE cluster. For more information, see CFS Usage.

      Limits

      For the limits of CFS, see CFS System Limits.
      To use CFS in TKE, you need to install this add-on in your cluster, which will occupy some system resources.

      CFS-CSI Permission

      Note:
      The Permission Scenarios section only lists the permissions related to the core features of the components, for a complete permission list, please refer to the Permission Definition.

      Permission Description

      The permission of this component is the minimal dependency required for the current feature to operate.
      The related directory /var/lib/kubelet on the host machine needs to be mounted to the container to accomplish volume mount/unmount, hence the activation of the privileged-level container is required.

      Permission Scenarios

      Feature
      Involved Object
      Involved Operation Permission
      It is required to support the dynamic creation of CFS instances.
      persistentvolumeclaims/persistentvolumes
      All operations
      storageclasses
      get/list/watch
      Supporting the cfs instance under the shared pattern
      tcfs
      get/list/watch/create/update/delete/patch
      deployment
      get/list/watch/create/update/delete
      node
      get/list

      Permission Definition

      kind: ClusterRole
      apiVersion: rbac.authorization.k8s.io/v1
      metadata:
        name: csi-cfs-controller-role
      rules:
        - apiGroups: [""]
          resources: ["nodes"]
          verbs: ["get", "list"]
        - apiGroups: [""]
          resources: ["services", "events", "configmaps", "endpoints"]
          verbs: ["get","list","create","update","patch","delete"]
        - apiGroups: [""]
          resources: ["services/status", "events/status"]
          verbs: ["get"]
        - apiGroups: [""]
          resources: ["persistentvolumes"]
          verbs: ["get", "list", "watch", "create", "delete", "update"]
        - apiGroups: [""]
          resources: ["persistentvolumeclaims"]
          verbs: ["get", "list", "watch", "update", "patch", "create"]
        - apiGroups: ["storage.k8s.io"]
          resources: ["volumeattachments", "volumeattachments/status"]
          verbs: ["get", "list", "watch", "update", "patch"]
        - apiGroups: ["storage.k8s.io"]
          resources: ["storageclasses"]
          verbs: ["get", "list", "watch"]
        - apiGroups: ["extensions"]
          resources: ["ingresses"]
          verbs: ["get", "list", "watch", "update", "patch", "create"]
        - apiGroups: ["extensions"]
          resources: ["ingresses/status"]
          verbs: ["get"]
        - apiGroups: ["apps"]
          resources: ["deployments"]
          verbs: ["get", "list", "delete", "update", "create", "watch"]
        - apiGroups: ["apps"]
          resources: ["deployments/status"]
          verbs: ["get"]
        - apiGroups: ["tcfsoperator.k8s.io"]
          resources: ["tcfs", "tcfs/status"]
          verbs: ["get", "list", "watch", "create", "delete", "update", "patch"]
      ---
      apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRole
      metadata:
        name: tcfs-subdir-external-provisioner-runner
      rules:
        - apiGroups: [""]
          resources: ["nodes"]
          verbs: ["get", "list", "watch"]
        - 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"]

      Directions

      Installing and setting the CFS add-on

      1. Log in to the TKE Console and select Cluster in the left sidebar.
      2. On the "Cluster Management" page, click the ID of the target cluster to go to the cluster details page.
      3. In the left sidebar, click Add-on Management to go to the "Add-on List" page.
      4. On the "Add-on List" page, click Create. On the displayed "Create an Add-on" page, select CFS.
      5. Click Finish to create the add-on.

      Creating a CFS-type StorageClass

      1. On the "Cluster Management" page, click the ID of the cluster that uses CFS to go to the cluster details page.
      2. In the left sidebar, choose Storage > StorageClass and click Create to go to the "Create a StorageClass" page.
      3. Create a CFS-type StorageClass based on your actual requirements, as shown in the figure below:
      
      
      4. Click Create a StorageClass to complete the creation.

      Creating a PersistentVolumeClaim

      1. On the "Cluster Management" page, click the ID of the cluster that uses CFS to go to the cluster details page.
      2. In the left sidebar, choose Storage > PersistentVolumeClaim and click Create to go to the "Create a PersistentVolumeClaim" page.
      3. Create a CFS-type PersistentVolumeClaim based on your actual requirements and select the StorageClass created above.
      4. Click Create a PersistentVolumeClaim to complete the creation process.

      Creating a workload

      1. On the "Cluster Management" page, click the ID of the cluster that uses CFS to go to the cluster details page.
      2. In the left sidebar, choose Workload > Deployment and click Create to go to the "Create a Workload" page.
      3. Based on your actual requirements, select Use an existing PVC for volumes and select the PVC created above.
      4. Mount the PVC to the specified container path and click Create a Workload to complete the creation process.
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