k8s pvc扩容：pvc创建后扩容

桃扇骨 2023-10-05 20:56 3阅读 0赞

## k8s pvc扩容：pvc创建后扩容 ##

![img][]

最开始的10g太小了，现在想扩容pv空间

1、kubernetes 1.11版本中开始支持pvc创建后的扩容

先查看storageclass是否配置了动态扩容，主要看storageclass是否存在allowVolumeExpansion字段

[root@192 ~]# kubectl  get storageclass default -oyaml
    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
      name: default
    parameters:
      archiveOnDelete: "false"
    provisioner: nfs-client-provisioner-default
    reclaimPolicy: Delete
    volumeBindingMode: Immediate
    [root@192 ~]#

可以看到并没有allowVolumeExpansion，此时是不支持动态扩容的，可以扩一下测试看看

[root@192 ~]# kubectl edit pvc -n leijun-mysql comom-store-column-03-24 
    # Please edit the object below. Lines beginning with a '#' will be ignored,
    # and an empty file will abort the edit. If an error occurs while saving this file will be
    # reopened with the relevant failures.
    #
    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: comom-store-column-03-24
      namespace: default
    spec:
      accessModes:
      - ReadWriteMany
      dataSource: null
      resources:
        requests:
          storage: 50Gi
      volumeName: pvc-24fc01a0-6d9b-11ea-9107-b8ca3a62236c
    status:
      accessModes:
      - ReadWriteMany
      capacity:
        storage: 10Gi
      phase: Bound
    "/tmp/kubectl-edit-fkm33.yaml" 38L, 1180C written
    error: persistentvolumeclaims "comom-store-column-03-24" could not be patched: persistentvolumeclaims "comom-store-column-03-24" is forbidden: only dynamically provisioned pvc can be resized and the storageclass that provisions the pvc must support resize
    You can run `kubectl replace -f /tmp/kubectl-edit-fkm33.yaml` to try this update again.
    [root@192 ~]#

kubectl edit pvc -n leijun-mysql comom-store-column-03-24
    修改storage 字段再保存，报错了，表示不支持动态扩容

2、给storageclass添加allowVolumeExpansion字段

[root@192 ~]# kubectl  edit  storageclass default    
    
    # Please edit the object below. Lines beginning with a '#' will be ignored,
    # and an empty file will abort the edit. If an error occurs while saving this file will be
    # reopened with the relevant failures.
    #
    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
      name: default
    parameters:
      archiveOnDelete: "false"
    provisioner: nfs-client-provisioner-default
    reclaimPolicy: Delete
    volumeBindingMode: Immediate
    allowVolumeExpansion: true   #增加该字段表示允许动态扩容
    ~                                                                                                                                          
    "/tmp/kubectl-edit-x0fyj.yaml" 24L, 738C written
    storageclass.storage.k8s.io/default edited
    [root@192 ~]#

3、再次修改pvc spec.resources.requests.storage字段

[root@192 ~]# kubectl edit pvc comom-store-column-03-24
    spec:
      accessModes:
      - ReadWriteMany
      dataSource: null
      resources:
        requests:
          storage: 30Gi
      volumeName: pvc-24fc01a0-6d9b-11ea-9107-b8ca3a62236c
    status:
      accessModes:
      - ReadWriteMany
      capacity:
        storage: 10Gi
      phase: Bound
    "/tmp/kubectl-edit-mibh7.yaml" 38L, 1180C written
    persistentvolumeclaim/comom-store-column-03-24 edited
    [root@192 ~]#

[img]: https://img-blog.csdnimg.cn/img_convert/4419e93bc9587e898dfc2432a9b531f2.png