Kubernetes 创建 pvc error getting claim reference: selfLink was empty, can‘t make refere
nfs插件报错误日志如下：
I0517 12:05:38.865404 1 leaderelection.go:156] attempting to acquire leader lease...
I0517 12:05:38.912969 1 leaderelection.go:178] successfully acquired lease to provision for pvc default/pvc-sc
I0517 12:05:38.913107 1 controller.go:1167] scheduleOperation[provision-default/pvc-sc[a75c71c6-f313-44d3-8fb6-ce67deabc651]]
E0517 12:05:38.926057 1 controller.go:853] Unexpected error getting claim reference to claim "default/pvc-sc": selfLink was empty, can‘t make reference
找了找资料发现，kubernetes 1.20版本 禁用了 selfLink。
解决方法1：
资料连接：
https://*.com/questions/65376314/kubernetes-nfs-provider-selflink-was-empty
https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/issues/25
当前的解决方法是编辑/etc/kubernetes/manifests/kube-apiserver.yaml
在这里：
spec:
containers:
- command:
- kube-apiserver
添加这一行：
- --feature-gates=RemoveSelfLink=false
然后应用它，即可
kubectl apply -f /etc/kubernetes/manifests/kube-apiserver.yaml
解决方法2：
如果是二进制安装的kubernetes集群，可以直接修改kube-apiserver文件，然后重启
vim /etc/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
ExecStart=/opt/kube/bin/kube-apiserver --advertise-address=192.168.40.199 --allow-privileged=true --anonymous-auth=false --api-audiences=api,istio-ca --authorization-mode=Node,RBAC --bind-address=192.168.40.199 --client-ca-file=/etc/kubernetes/ssl/ca.pem --endpoint-reconciler-type=lease --etcd-cafile=/etc/kubernetes/ssl/ca.pem --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem --etcd-servers=https://192.168.40.199:2379,https://192.168.40.207:2379,https://192.168.40.209:2379 --kubelet-certificate-authority=/etc/kubernetes/ssl/ca.pem --kubelet-client-certificate=/etc/kubernetes/ssl/kubernetes.pem --kubelet-client-key=/etc/kubernetes/ssl/kubernetes-key.pem --secure-port=6443 --service-account-issuer=https://kubernetes.default.svc --service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem --service-account-key-file=/etc/kubernetes/ssl/ca.pem --service-cluster-ip-range=10.68.0.0/16 --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem --requestheader-client-ca-file=/etc/kubernetes/ssl/ca.pem --requestheader-allowed-names= --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-group-headers=X-Remote-Group --requestheader-username-headers=X-Remote-User --proxy-client-cert-file=/etc/kubernetes/ssl/aggregator-proxy.pem --proxy-client-key-file=/etc/kubernetes/ssl/aggregator-proxy-key.pem --enable-aggregator-routing=true --feature-gates=RemoveSelfLink=false --v=2
Restart=always
RestartSec=5
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
重新加载kube-apiserver.service
systemctl daemon-reload && systemctl restart kube-apiserver
重新删除一下nfs插件，观察日志，直到日志显示如下，即为成功
[root@master1-192-168-40-199 ~]# kubectl logs -n kube-system nfs-provisioner-01-574d6c4db6-nbfdw
I0517 12:06:33.573502 1 controller.go:492] Starting provisioner controller 52712073-b708-11eb-804e-86e1c009f86c!
I0517 12:06:33.602105 1 controller.go:1167] scheduleOperation[lock-provision-default/pvc-sc[a75c71c6-f313-44d3-8fb6-ce67deabc651]]
I0517 12:06:33.639435 1 leaderelection.go:156] attempting to acquire leader lease...
I0517 12:06:48.602638 1 controller.go:1167] scheduleOperation[lock-provision-default/pvc-sc[a75c71c6-f313-44d3-8fb6-ce67deabc651]]
I0517 12:06:50.264165 1 leaderelection.go:178] successfully acquired lease to provision for pvc default/pvc-sc
I0517 12:06:50.264748 1 controller.go:1167] scheduleOperation[provision-default/pvc-sc[a75c71c6-f313-44d3-8fb6-ce67deabc651]]
I0517 12:06:50.281135 1 controller.go:900] volume "pvc-a75c71c6-f313-44d3-8fb6-ce67deabc651" for claim "default/pvc-sc" created
I0517 12:06:50.298751 1 controller.go:917] volume "pvc-a75c71c6-f313-44d3-8fb6-ce67deabc651" for claim "default/pvc-sc" saved
I0517 12:06:50.298796 1 controller.go:953] volume "pvc-a75c71c6-f313-44d3-8fb6-ce67deabc651" provisioned for claim "default/pvc-sc"
I0517 12:06:52.282891 1 leaderelection.go:198] stopped trying to renew lease to provision for pvc default/pvc-sc, task succeeded