与statefulset相关资源有三部分：statefulset、pv/pvc、svc，svc和pv/pvc需要手动删除。
通常删除statefulset时，推荐将其副本数置为0，实现有序停止，然后再删除statefulset，最后考虑是否需要删除svc和存储卷！
statefulset还提供了 —cascade=false 选项，表示不删除对应Pod，不过此项使用较少。

[root@maxiaoke local-k8s-yaml]# kubectl -n apps patch sts nginx-web -p '{"spec":{"replicas":0}}' # 有序停止
[root@maxiaoke local-k8s-yaml]# kubectl delete -n apps sts nginx-web # 删除statefulset
[root@maxiaoke local-k8s-yaml]# kubectl delete svc -n apps my-svc # 删除svc
[root@maxiaoke local-k8s-yaml]# kubectl get pv -n apps
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                        STORAGECLASS          REASON   AGE
pvc-1461c537-e784-41fd-9e78-b1e6b212912c   2Gi        RWX            Delete           Bound    apps/nginx-web-nginx-web-1   managed-nfs-storage            11h
pvc-277cff8f-c5e6-43fc-9498-ddc9ba788cb9   2Gi        RWO            Delete           Bound    apps/nginx-web-nginx-web-4   managed-nfs-storage            30m
pvc-7d1a1169-6e34-4331-9549-f2f4d2bf6f94   2Gi        RWO            Delete           Bound    apps/nginx-web-nginx-web-3   managed-nfs-storage            30m
pvc-b36b90f1-a268-4815-b55b-6f7fda587193   2Gi        RWX            Delete           Bound    apps/nginx-web-nginx-web-0   managed-nfs-storage            11h
pvc-d804a299-95e1-486c-a9cd-73c925ed21d6   2Gi        RWO            Delete           Bound    apps/nginx-web-nginx-web-2   managed-nfs-storage            31m
[root@maxiaoke local-k8s-yaml]# kubectl get pvc -n apps  # pv和pvc即使删除Pod还是处于绑定状态，需要手动释放
NAME                    STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS          AGE
nginx-web-nginx-web-0   Bound    pvc-b36b90f1-a268-4815-b55b-6f7fda587193   2Gi        RWX            managed-nfs-storage   11h
nginx-web-nginx-web-1   Bound    pvc-1461c537-e784-41fd-9e78-b1e6b212912c   2Gi        RWX            managed-nfs-storage   11h
nginx-web-nginx-web-2   Bound    pvc-d804a299-95e1-486c-a9cd-73c925ed21d6   2Gi        RWO            managed-nfs-storage   31m
nginx-web-nginx-web-3   Bound    pvc-7d1a1169-6e34-4331-9549-f2f4d2bf6f94   2Gi        RWO            managed-nfs-storage   31m
nginx-web-nginx-web-4   Bound    pvc-277cff8f-c5e6-43fc-9498-ddc9ba788cb9   2Gi        RWO            managed-nfs-storage   30m
[root@maxiaoke local-k8s-yaml]# kubectl get pvc -n apps | awk '/nginx-web-nginx-web/{print "kubectl -n apps delete pvc", $1}'|bash