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Community Blog Container Storage: Migrating from FlexVolume to CSI (NAS and OSS Volumes)

Container Storage: Migrating from FlexVolume to CSI (NAS and OSS Volumes)

This article shows you how to replace Alibaba Cloud NAS and OSS volumes mounted through FlexVolume with those of the Container Storage Interface (CSI) type.

By Kan Junbao (Junbao)

FlexVolume is a storage plugin that has been supported by Kubernetes since its earlier versions. At present, the Kubernetes community still uses FlexVolume as a storage plugin. FlexVolume is a non-containerized solution. The community introduced the Container Storage Interface (CSI) specification and will maintain and update the CSI specification in the long run.

Earlier versions of Alibaba Cloud Container Service for Kubernetes (ACK) support only FlexVolume. ACK now supports both FlexVolume and CSI. With the constant evolution of CSI, CSI has far surpassed FlexVolume in terms of orchestration capabilities. Therefore, the long-term plan for ACK is to eventually support only CSI, and gradually stop the support for FlexVolume.

This article shows you how to replace Alibaba Cloud NAS and OSS volumes mounted through FlexVolume with those of the CSI type.

Constraints

To perform this operation, you must upgrade your ACK cluster to 1.16 or later.

If you have mounted a cloud disk to your cluster through FlexVolume, the solution described in this article is not applicable.

To migrate from FlexVolume drivers to CSI, you must restart the running pods and redefine persistent volumes (PVs) and persistent volume claims (PVCs).

CSI Deployment

To deploy the CSI plugin in your cluster, use a template provided on the following page (you can also select a later release from the dropdown list, for example, release-v1.0.6): https://github.com/kubernetes-sigs/alibaba-cloud-csi-driver/tree/release-v1.0.5/deploy/ack

Run the following commands to deploy CSI:

# kubectl apply -f csi-plugin.yaml
# kubectl apply -f csi-provisioner.yaml

When you deploy CSI, replace the address of the mirror to the region address of your cluster to improve the download speed. For example, replace registry.cn-hangzhou.aliyuncs.com/acs/csi-plugin:v1.14.8.39-0d749258-aliyun with registry-vpc.cn-beijing.aliyuncs.com/acs/csi-plugin:v1.14.8.39-0d749258-aliyun.

After you complete the deployment, check whether the deployment is successful.

# kubectl get pod -nkube-system |grep csi
csi-plugin-5jqf6                                    9/9     Running   0          4m15s
csi-plugin-dt8fd                                    9/9     Running   0          4m15s
csi-plugin-nlnpn                                    9/9     Running   0          4m15s
csi-plugin-p5lv6                                    9/9     Running   0          4m15s
csi-plugin-s29wp                                    9/9     Running   0          4m15s
csi-provisioner-58cb59cf6c-5c9qj                    8/8     Running   0          4m9s
csi-provisioner-58cb59cf6c-k96v2                    8/8     Running   0          4m9s

Note: A StorageClass-related error may occur when you deploy csi-provisioner.

This error is caused because FlexVolume and Disk-Controller also have corresponding StorageClasses which have the same name as the CSI StorageClass.

To solve this error, delete the existing StorageClasses and then reapply csi-provisioner:

# kubectl get sc
NAME                       PROVISIONER                       AGE
alicloud-disk-available    alicloud/disk                     5h11m
alicloud-disk-efficiency   alicloud/disk                     5h11m
alicloud-disk-essd         alicloud/disk                     5h11m
alicloud-disk-ssd          alicloud/disk                     5h11m

# kubectl delete sc alicloud-disk-available alicloud-disk-efficiency alicloud-disk-essd alicloud-disk-ssd
storageclass.storage.k8s.io "alicloud-disk-available" deleted
storageclass.storage.k8s.io "alicloud-disk-efficiency" deleted
storageclass.storage.k8s.io "alicloud-disk-essd" deleted
storageclass.storage.k8s.io "alicloud-disk-ssd" deleted

# kubectl apply -f csi-provisioner.yaml

# kubectl get sc
NAME                       PROVISIONER                       AGE
alicloud-disk-available    diskplugin.csi.alibabacloud.com   84s
alicloud-disk-efficiency   diskplugin.csi.alibabacloud.com   84s
alicloud-disk-essd         diskplugin.csi.alibabacloud.com   84s
alicloud-disk-ssd          diskplugin.csi.alibabacloud.com   84s
alicloud-disk-topology     diskplugin.csi.alibabacloud.com   5m18s

Migration of a Static NAS Volume

Procedure:

  • Retain the PVC and PV templates of the FlexVolume type.
  • Create a PVC and a PV of the CSI type.
  • Update the application to apply the new CSI PVC that you created in the previous step.

The following shows you how to migrate a NAS PVC in a deployment:

# kubectl get deploy
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
nas-static   2/2     2            2           6m21s

# kubectl get pod
NAME                          READY   STATUS    RESTARTS   AGE
nas-static-7f9446758b-2qfxj   1/1     Running   0          11m
nas-static-7f9446758b-wcwc5   1/1     Running   0          11m

# kubectl describe pod nas-static-7f9446758b-2qfxj |grep ClaimName
    ClaimName:  nas-pvc

# kubectl get pvc
NAME      STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
nas-pvc   Bound    nas-pv   512Gi      RWX            nas            12m

## Log on to the node where the pod is located and view information about the mounting.
2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com:/aliyun on /var/lib/kubelet/pods/b9f14e39-86ed-4c39-b4b7-baba37b15bac/volumes/alicloud~nas/nas-pv type nfs4 (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,noresvport,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.7.208,local_lock=none,addr=192.168.1.152)

Step 1: Retain the existing PVC (nas-pvc) and PV (nas-pv).

# kubectl get pvc nas-pvc -oyaml > pvc.nas-pvc.yaml
# cat pvc.nas-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nas-pvc
  namespace: default
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 512Gi
  selector:
    matchLabels:
      alicloud-pvname: nas-pv
  storageClassName: nas
  
# kubectl get pv nas-pv -oyaml > pv.nas-pv.yaml
# cat pv.nas-pv.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  labels:
    alicloud-pvname: nas-pv
  name: nas-pv
spec:
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 512Gi
  flexVolume:
    driver: alicloud/nas
    options:
      path: /aliyun
      server: 2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com
      vers: "3"
  persistentVolumeReclaimPolicy: Retain
  storageClassName: nas

Step 2: Create a PVC (nas-pvc-new) and a PV (nas-pv-new) of the CSI type.

# cat pvc.nas-pvc-new.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nas-pvc-new
  namespace: default
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 512Gi
  selector:
    matchLabels:
      alicloud-pvname: nas-pv-new
  storageClassName: nas
  
## Change the FlexVolume configuration to the CSI configuration.
## You can write the options in mountOptions.
# cat pv.nas-pv-new.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  labels:
    alicloud-pvname: nas-pv-new
  name: nas-pv-new
spec:
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 512Gi
  csi:
    driver: nasplugin.csi.alibabacloud.com
    volumeHandle: nas-pv-new
    volumeAttributes:
      server: "2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com"
      path: "/aliyun"
  mountOptions:
  - nolock,tcp,noresvport
  - vers=3
  persistentVolumeReclaimPolicy: Retain
  storageClassName: nas
  
# kubectl apply -f pvc.nas-pvc-new.yaml
# kubectl apply -f pv.nas-pv-new.yaml 

# kubectl get pvc
NAME          STATUS   VOLUME       CAPACITY   ACCESS MODES   STORAGECLASS   AGE
nas-pvc       Bound    nas-pv       512Gi      RWX            nas            30m
nas-pvc-new   Bound    nas-pv-new   512Gi      RWX            nas            2s

Step 3: Update the application to apply the new CSI PVC.

# kubectl edit deploy nas-static

Replace the existing PVC with the new PVC.
      volumes:
      - name: pvc-nas
        persistentVolumeClaim:
          claimName: nas-pvc-new

## Check whether the pod has been restarted.
# kubectl get pod
NAME                          READY   STATUS    RESTARTS   AGE
nas-static-6f7d965689-7sm5b   1/1     Running   0          70s
nas-static-6f7d965689-8npxw   1/1     Running   0          53s

## View information about the mounting.
2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com:/aliyun on /var/lib/kubelet/pods/ac02ea3f-125f-4b38-9bcf-9b117f62eaf0/volumes/kubernetes.io~csi/nas-pv-new/mount type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,nolock,noresvport,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.152,mountvers=3,mountport=2049,mountproto=tcp,local_lock=all,addr=192.168.1.152)

Through the preceding three steps, an NAS volume mounted through FlexVolume in a deployment is replaced with an NAS volume of the CSI type.

Migration of a Dynamic NAS Volume

Procedure:

  • Retain the StorageClass, PVC, and PV templates of the FlexVolume type.
  • Create a StorageClass, a PVC, and a PV of the CSI type.
  • Update the application to apply the new CSI PVC that you created in the previous step.
  • When you create PVCs later, use CSI StorageClasses.

The following shows you how to migrate a dynamic PV in a StatefulSet:

# kubectl get sts
NAME   READY   AGE
web    2/2     3m11s

# kubectl get pod
NAME    READY   STATUS    RESTARTS   AGE
web-0   1/1     Running   0          3m14s
web-1   1/1     Running   0          118s

# kubectl get pvc
NAME            STATUS   VOLUME                                                           CAPACITY   ACCESS MODES   STORAGECLASS   AGE
nas-pvc-web-0   Bound    default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3   20Gi       RWX            alicloud-nas   3m32s
nas-pvc-web-1   Bound    default-nas-pvc-web-1-pvc-95eee8f9-54f4-42dc-a34f-b554423220eb   20Gi       RWX            alicloud-nas   2m16s

# kubectl get pv
NAME                                                             CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                   STORAGECLASS   REASON   AGE
default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3   20Gi       RWX            Delete           Bound    default/nas-pvc-web-0   alicloud-nas            2m34s
default-nas-pvc-web-1-pvc-95eee8f9-54f4-42dc-a34f-b554423220eb   20Gi       RWX            Delete           Bound    default/nas-pvc-web-1   alicloud-nas            2m14s

# kubectl get sc alicloud-nas
NAME           PROVISIONER    AGE
alicloud-nas   alicloud/nas   106m

Step 1: Retain the existing StorageClass, PVC, and PV templates.

## Retain the PVC template.
# kubectl get pvc nas-pvc-web-0 -oyaml > origin/nas-pvc-web-0.yaml
# cat origin/nas-pvc-web-0.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    volume.beta.kubernetes.io/storage-provisioner: alicloud/nas
  finalizers:
  - kubernetes.io/pvc-protection
  labels:
    app: nginx
  name: nas-pvc-web-0
  namespace: default
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 20Gi
  storageClassName: alicloud-nas    
# kubectl get pvc nas-pvc-web-1 -oyaml > origin/nas-pvc-web-1.yaml

## Retain the PV template.
# kubectl get pv default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3 -oyaml > origin/default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3.yaml
# cat origin/default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  annotations:
    pv.kubernetes.io/provisioned-by: alicloud/nas
  labels:
    createdby.aliyun.com: alicloud-nas-controller
    version.controller.aliyun.com: v1.14.3-58bf821
  name: default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3
spec:
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 20Gi
  flexVolume:
    driver: alicloud/nas
    options:
      options: nolock,tcp,noresvport,vers=3
      path: /root/default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3
      server: 2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com
      vers: "3"
  persistentVolumeReclaimPolicy: Delete
  storageClassName: alicloud-nas
# kubectl get pv default-nas-pvc-web-1-pvc-95eee8f9-54f4-42dc-a34f-b554423220eb -oyaml > origin/default-nas-pvc-web-1-pvc-95eee8f9-54f4-42dc-a34f-b554423220eb.yaml

## Retain the StorageClass template.
# kubectl get sc alicloud-nas -oyaml > origin/alicloud-nas.yaml
# cat origin/alicloud-nas.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: alicloud-nas
mountOptions:
- nolock,tcp,noresvport
- vers=3
parameters:
  archiveOnDelete: "true"
  driver: flexvolume
  server: 2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com:/root/
provisioner: alicloud/nas
reclaimPolicy: Delete
volumeBindingMode: Immediate

Step 2: Create a StorageClass, a PVC, and a PV of the CSI type.

## The existing PVC is nas-pvc-web-0, and the new PVC is nas-pvc-new-web-0. Here, nas-pvc is the name of the volume configured in the StatefulSet, and is now changed to nas-pvc-new.
## Set provisioner to nasplugin.csi.alibabacloud.com.
## Set name to nas-pvc-new-web-0.
## Set storageClassName to alicloud-nas-new.
## Set alicloud-pvname to nas-pvc-new-web-0-pv (You can choose any name. However, to improve readability and ensure global uniqueness of the PVC name, we recommend that you add pv or namespace to the end of the name.)

# cat nas-pvc-new-web-0.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  annotations:
    volume.beta.kubernetes.io/storage-provisioner: nasplugin.csi.alibabacloud.com
  labels:
    app: nginx
  name: nas-pvc-new-web-0
  namespace: default
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 20Gi
  storageClassName: alicloud-nas-new
  selector:
    matchLabels:
      alicloud-pvname: nas-pvc-new-web-0-pv

## Replace the existing PV default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3 with the following new PV:
## Set provisioned-by to nasplugin.csi.alibabacloud.com.
## Set labels to nas-pvc-new-web-0-pv.
## Set name to nas-pvc-new-web-0-pv.
## Change FlexVolume configurations to CSI configurations: Set volumeHandle to the name of the PV.
## Set storageClassName to alicloud-nas-new.

# cat nas-pvc-new-web-0-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  annotations:
    pv.kubernetes.io/provisioned-by: nasplugin.csi.alibabacloud.com
  finalizers:
  - kubernetes.io/pv-protection
  labels:
    alicloud-pvname: nas-pvc-new-web-0-pv
  name: nas-pvc-new-web-0-pv
spec:
  accessModes:
  - ReadWriteMany
  capacity:
    storage: 20Gi
  csi:
    driver: nasplugin.csi.alibabacloud.com
    volumeHandle: nas-pvc-new-web-0-pv
    volumeAttributes:
      server: "2564f49129-ysu87.cn-shenzhen.nas.aliyuncs.com"
      path: "/root/default-nas-pvc-web-0-pvc-951911bd-b7f3-4551-8647-22f1f5d576b3"
  mountOptions:
  - nolock,tcp,noresvport
  - vers=3
  persistentVolumeReclaimPolicy: Delete
  storageClassName: alicloud-nas-new
  
Create additional PVCs and PVs following the preceding steps.
Replace the existing PVC nas-pvc-web-1 with the new PVC nas-pvc-new-web-1.   
Replace the existing PV default-nas-pvc-web-1-pvc-95eee8f9-54f4-42dc-a34f-b554423220eb with nas-pvc-new-web-1-pv.

# kubectl get pvc
NAME                STATUS   VOLUME                                                           CAPACITY   ACCESS MODES   STORAGECLASS       AGE
nas-pvc-new-web-0   Bound    nas-pvc-new-web-0-pv                                             20Gi       RWX            alicloud-nas-new   13m
nas-pvc-new-web-1   Bound    nas-pvc-new-web-1-pv                                             20Gi       RWX            alicloud-nas-new   10m

Step 3: Update the application to change the volume to nas-pvc-new.

## Change the volume in the StatefulSet template from nas-pvc to nas-pvc-new.
  volumeClaimTemplates:
  - metadata:
      name: nas-pvc-new
    spec:

## Delete the existing StatefulSet (volumeClaimTemplates of the StatefulSet cannot be edited), and create a new one.
# kubectl delete sts web
# kubectl apply -f sts.yaml

Check the new application:

# kubectl get pod
NAME    READY   STATUS    RESTARTS   AGE
web-0   1/1     Running   0          9m37s
web-1   1/1     Running   0          9m20s

# kubectl describe pod web-0 | grep ClaimName
    ClaimName:  nas-pvc-new-web-0

# kubectl get pvc nas-pvc-new-web-0
NAME                STATUS   VOLUME                 CAPACITY   ACCESS MODES   STORAGECLASS       AGE
nas-pvc-new-web-0   Bound    nas-pvc-new-web-0-pv   20Gi       RWX            alicloud-nas-new   17m

Migration of a Static OSS PV or PVC

Procedure:

  • Retain the PVC and PV templates of the FlexVolume type.
  • Create a PVC and a PV of the CSI type.
  • Update the application to apply the new CSI PVC that you created in the previous step.

The following shows you how to migrate a static OSS PV or PVC in a deployment:

# kubectl get deploy
NAME              READY   UP-TO-DATE   AVAILABLE   AGE
nginx-oss-deploy   1/1     1            1           5m37s

# kubectl get pod
NAME                              READY   STATUS    RESTARTS   AGE
nginx-oss-deploy-f49d8d6c4-df892   1/1     Running   0          6m1s

# kubectl describe pod nas-static-7f9446758b-2qfxj |grep ClaimName
    ClaimName:  pvc-oss

# kubectl get pvc
NAME      STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
pvc-oss   Bound    pv-oss   5Gi        RWX                           7m23s

# kubectl get pv pv-oss -o yaml

    flexVolume:
      driver: alicloud/oss
      options:
        akId: xxxx
        akSecret: xxx
        bucket: oss-mount-test
        otherOpts: -o max_stat_cache_size=0 -o allow_other
        url: oss-cn-shanghai.aliyuncs.com

Step 1: Retain the existing PVC (pvc-oss) and PV (pv-oss).

# kubectl get pvc pvc-oss -oyaml > flex.oss-pvc.yaml
# cat flex.oss-pvc.yaml
apiVersion: v1
items:
- apiVersion: v1
  kind: PersistentVolumeClaim
    name: pvc-oss
    namespace: default
  spec:
    accessModes:
    - ReadWriteMany
    resources:
      requests:
        storage: 5Gi
    volumeMode: Filesystem
    volumeName: pv-oss
  status:
    accessModes:
    - ReadWriteMany
    capacity:
      storage: 5Gi
    phase: Bound
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""

# kubectl get pv pv-oss -oyaml > flex.oss-pv.yaml
# cat flex.oss-pv.yaml
apiVersion: v1
items:
- apiVersion: v1
  kind: PersistentVolume
  metadata:
    name: pv-oss
  spec:
    accessModes:
    - ReadWriteMany
    capacity:
      storage: 5Gi
    claimRef:
      apiVersion: v1
      kind: PersistentVolumeClaim
      name: pvc-oss
      namespace: default
    flexVolume:
      driver: alicloud/oss
      options:
        akId: xxx
        akSecret: xxx
        bucket: oss-mount-test
        otherOpts: -o max_stat_cache_size=0 -o allow_other
        url: oss-cn-shanghai.aliyuncs.com
    persistentVolumeReclaimPolicy: Retain
    volumeMode: Filesystem
  status:
    phase: Bound
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""

Step 2: Create a PVC (pvc-oss-new) and a PV (pv-oss-new) of the CSI type.

# cat csi.oss-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: oss-csi-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  selector:
    matchLabels:
      alicloud-pvname: oss-csi-pv

# cat csi.oss-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: oss-csi-pv
  labels:
    alicloud-pvname: oss-csi-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: ossplugin.csi.alibabacloud.com
    # set volumeHandle same value pv name
    volumeHandle: oss-csi-pv
    volumeAttributes:
      bucket: "oss-mount-test"
      url: "oss-cn-shanghai.aliyuncs.com"
      otherOpts: "-o max_stat_cache_size=0 -o allow_other"
      akId: "***"
      akSecret: "***"
      path: "/"

# kubectl apply -f csi.oss-pv.yaml
# kubectl apply -f csi.oss-pvc.yaml

# kubectl get pvc
NAME         STATUS   VOLUME       CAPACITY   ACCESS MODES   STORAGECLASS   AGE
oss-csi-pvc   Bound    oss-csi-pv   5Gi        RWO                           7m15s
pvc-oss       Bound    pv-oss       5Gi        RWX                           52m

Step 3: Update the application to apply the new CSI PVC.

# kubectl edit deploy nginx-oss-deploy
        volumes:
        - name: oss1
          persistentVolumeClaim:
            claimName: oss-csi-pvc
// Check whether the pod has been restarted.
# kubectl get pods
NAME                               READY   STATUS    RESTARTS   AGE
nginx-oss-deploy-d84b9bb86-nxbf5   1/1     Running   0          21s

Through the preceding three steps, an OSS volume mounted through FlexVolume in a deployment is replaced with an OSS volume of the CSI type.

Solution for OSS volumes where secrets are configured:

Procedure

  • Acquire the secret used in the FlexVolume deployment.
  • Use the secret to create a static OSS PVC and PV of the CSI type.
  • Change the FlexVolume deployment reference to the new PVC and PV that you created in the previous step.

Step 1: Acquire the secret used in the FlexVolume deployment.

# kubectl get secret osssecret -o yaml
apiVersion: v1
data:
  akId: xxxx
  akSecret: xxxx
kind: Secret
metadata:
  name: oss-secret
  namespace: default
type: alicloud/oss

Step 2: Use the secret to create a static OSS PVC and PV of the CSI type.

# kubectl apply -f secret-pvc-pv.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: oss-csi-pvc-secret
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
  selector:
    matchLabels:
      alicloud-pvname: oss-csi-pv-secret
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: oss-csi-pv-secret
  labels:
    alicloud-pvname: oss-csi-pv-secret
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: ossplugin.csi.alibabacloud.com
    volumeHandle: oss-csi-pv-secret // The specified value must be the same as the name of the PV.
    nodePublishSecretRef:
      name: oss-secret
      namespace: default
    volumeAttributes:
      bucket: "oss"
      url: "oss-cn-hangzhou.aliyuncs.com"
      otherOpts: "-o max_stat_cache_size=0 -o allow_other"
      
# kubectl get pvc oss-csi-pvc-secret
NAME                 STATUS   VOLUME              CAPACITY   ACCESS MODES   STORAGECLASS   AGE
oss-csi-pvc-secret   Bound    oss-csi-pv-secret   5Gi        RWX                           3m35s

Step 3: Change the deployment reference to the PVC that you created in the previous step.

# kubectl edit deploy nginx-oss-deploy
        volumes:
        - name: oss1
          persistentVolumeClaim:
            claimName: oss-csi-pvc-secret
// Check whether the pod has been restarted.
# kubectl get pods
NAME                               READY   STATUS    RESTARTS   AGE
nginx-oss-deploy-d84bxxrs6-nxbf5   1/1     Running   0          2s
Storage Container Object Storage Service Network Attached Storage Kubernetes FlexVolume Container Storage Interface
0 0 0
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