【错误】
正常创建storageclass，但是创建PVC一直Pending，查看PV没有被创建
[root@crust-m02 ~]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
test-claim1 Pending nfs-client 1 0m
【分析】
- 查看storageclass的日志
[root@crust-m02 ~]# kubectl logs -n storageclass storageclass-nfs-client-provisioner-96d4f67c5-svqf9
- 输入如下
E0708 09:54:04.267529 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 10:05:26.529992 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 10:05:26.533022 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 10:20:26.530290 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 10:20:26.535305 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 10:35:26.530458 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 10:35:26.533075 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 10:50:26.530627 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 10:50:26.535387 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 11:05:26.530833 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 11:05:26.537123 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 11:20:26.530968 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 11:20:26.534794 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
I0708 11:35:26.531254 1 controller.go:987] provision "default/test-claim1" class "nfs-client": started
E0708 11:35:26.536277 1 controller.go:1004] provision "default/test-claim1" class "nfs-client": unexpected error getting claim reference: selfLink was empty, can't make reference
可见错误：selfLink was empty, can't make reference
查了一下资料，发现是 1.20版本之后 禁用了 selfLink
【解决】
- 启用 selfLink
在每个master节点上修改kube-apiserver的yml文件 ：/etc/kubernetes/manifests/kube-apiserver.yaml
添加- --feature-gates=RemoveSelfLink=false这一行，如下所示：
spec:
containers:
- command:
- kube-apiserver
- --feature-gates=RemoveSelfLink=false #添加这一行
- --advertise-address=10.10.239.201
- --allow-privileged=true
因为这是静态pod，修改完成后会自动更新（了解静态pod可以参见我的文档《k8s-静态pod》）
- 查看修改结果
如下可见，三个apiserver都更新了：
[root@crust-m01 ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
……
kube-apiserver-crust-m01 1/1 Running 0 6m
kube-apiserver-crust-m02 1/1 Running 0 9m
kube-apiserver-crust-m03 1/1 Running 0 60s
……
- 测试
删除storageclass的pod，新pod自启动后可以正常使用storageclass创建pv了
[root@crust-m01 ~]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
test-claim1 Bound pvc-36bab495-1b32-4dbb-8daf-bd3d48c0c2cb 1Mi RWX nfs-client 43m
[root@crust-m01 ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pvc-36bab495-1b32-4dbb-8daf-bd3d48c0c2cb 1Mi RWX Delete Bound default/test-claim1 nfs-client 43m
