最近在学习k8s的相关知识，嗯，出现一些问题，记录下。

说明

Docker 20.10.12
kubeadm-v1.23.4
kubelet-v1.23.4
kubectl-v1.23.4

对，需要对volume，pv，pvc有了解哈
在使用nfs持久化存储这块出现的问题
nfs的k8s持久化存储的插件：https://github.com/kubernetes-retired/external-storage/tree/master/nfs

问题及解决

在创建pvc报的错

kubectl apply -f my-pvc.yaml
kubectl get pvc

这块有一些问题，就是

[root@k8sm storage]# kubectl describe pvc
Name:          my-pvc
Namespace:     default
StorageClass:  example-nfs
Status:        Pending
Volume:        
Labels:        <none>
Annotations:   control-plane.alpha.kubernetes.io/leader:
                 {"holderIdentity":"7c4527be-a9ea-11ec-93ce-3a41d59f9259","leaseDurationSeconds":15,"acquireTime":"2022-03-22T14:30:27Z","renewTime":"2022-...
               volume.beta.kubernetes.io/storage-class: example-nfs
               volume.beta.kubernetes.io/storage-provisioner: example.com/nfs
               volume.kubernetes.io/storage-provisioner: example.com/nfs
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      
Access Modes:  
VolumeMode:    Filesystem
Used By:       <none>
Events:
  Type    Reason                Age                 From                         Message
  ----    ------                ----                ----                         -------
  Normal  ExternalProvisioning  11s (x21 over 43s)  persistentvolume-controller  waiting for a volume to be created, either by external provisioner "example.com/nfs" or manually created by system administrator

Normal ExternalProvisioning 11s (x21 over 43s) persistentvolume-controller waiting for a volume to be created, either by external provisioner “example.com/nfs” or manually created by system administrator

一直都在pending状态
去查了一下，解决方式：

修改apiserver的配置

[root@k8sm storage]# vi /etc/kubernetes/manifests/kube-apiserver.yaml
apiVersion: v1
···
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    - --feature-gates=RemoveSelfLink=false # 添加这个配置
重启下kube-apiserver.yaml
[root@k8sm manifests]# kubectl apply -f kube-apiserver.yaml

[root@k8sm storage]# kubectl get pvc
NAME     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
my-pvc   Bound    pvc-ae9f6d4b-fc4c-4e19-8854-7bfa259a3a04   1Mi        RWX            example-nfs    13m

就正常了，查了下为什么？
因为原来是1.20版本（我的是1.23.4）默认禁止使用selfLink。
哦，那啥事selfLink？
selfLink：通过API访问资源自身的URL，例如一个Pod的link可能是/api/v1/namespaces/ns36aa8455/pods/sc-cluster-test-1-6bc58d44d6-r8hld

额，到这把。。