k8s pvc扩容：pvc创建后扩容

![](/media/202301/2023-01-20_110038_9585070.020969841654447152.png)
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

```
[[email protected] ~]# 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
[[email protected] ~]# 
```

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

```
[[email protected] ~]# 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.
[[email protected] ~]# 
```

```
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

```yml
[[email protected] ~] apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata: name: default
parameters: archiveOnDelete: "false"
provisioner: nfs-client-provisioner-default
reclaimPolicy: Delete
volumeBindingMode: Immediate
allowVolumeExpansion: true 
~ "/tmp/kubectl-edit-x0fyj.yaml" 24L, 738C written
storageclass.storage.k8s.io/default edited
[[email protected] ~]
```

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

```yml
[[email protected] ~]
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
[[email protected] ~]
```