今天升级Kubernetes到1.20，发现PVC创建时一直处于pending状态，经过检查发现，nfs-client-provisioner日志有如下错误：
1 | provision "test/test-sql" class "nfs-storage": unexpected error getting claim reference: selfLink was empty, can't make reference |
经过查找发现这个是V1.10之后的配置修改，具体参考： https://github.com/kubernetes/enhancements/issues/1164
找到原因，直接修改/etc/kubernetes/manifests/kube-apiserver.yaml，增加参数：
1 | - --feature-gates=RemoveSelfLink=false |
