kubectl get pod时 报错couldn't get resource list for cert-manager.io/v1alpha1

问题：

在k8s下执行"kubectl get pod "时，报一下错误：

[root@app1 ~]# kubectl get pod
E0528 12:27:42.105135  187150 memcache.go:255] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:27:42.106730  187150 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:27:42.108499  187150 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:27:42.111427  187150 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request

问题定位：
该问题由于kubectl 在访问apiservice过程导致，通过以下命令查看问题原因： 

[root@app1 ~]# kubectl describe apiservice v1alpha1.cert-manager.io
E0528 12:25:53.708862  185582 memcache.go:255] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:25:53.713279  185582 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:25:53.715726  185582 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:25:53.718525  185582 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
Name: v1alpha1.cert-manager.io
Namespace:
Labels: app=cert-manager-webhook-dnspod
              app.kubernetes.io/managed-by=Helm
              chart=cert-manager-webhook-dnspod-0.3.3
              heritage=Helm
              release=cert-manager-webhook-dnspod
Annotations: cert-manager.io/inject-ca-from: cert-manager/cert-manager-webhook-dnspod-webhook-tls
              meta.helm.sh/release-name: cert-manager-webhook-dnspod
              meta.helm.sh/release-namespace: cert-manager
API Version: apiregistration.k8s.io/v1
Kind: APIService
Metadata:
  Creation Timestamp: 2023-07-14T02:18:21Z
  Managed Fields:
    API Version: apiregistration.k8s.io/v1
    Fields Type: FieldsV1
    fieldsV1:
…………

  Service:
    Name: cert-manager-webhook-dnspod
    Namespace: cert-manager
    Port: 443
  Version: v1alpha1
  Version Priority: 15
Status:
  Conditions:
    Last Transition Time: 2024-01-24T02:00:32Z
    Message: endpoints for service/cert-manager-webhook-dnspod in "cert-manager" have no addresses with port name "https"
    Reason: MissingEndpoints
    Status: False
    Type: Available
Events: <none>

cert-manager没有地址，导致此问题报错

查看endpint相关信息，缺少IP地址：

[root@app1 ~]# kubectl get endpoints -A|grep dns
E0528 12:28:13.420696  187613 memcache.go:255] couldn't get resource list for cert-man
cert-manager       cert-manager-webhook-dnspod <none> 39m
kube-system        kube-dns                                  172.16.245.122:53,172.16.245.123:53,172.16.245.122:53 + 3 more... 452d

cert-manager在该平台中未使用，使用以下命令进行清查操作：

[root@app1 ~]# kubectl delete endpoints -n cert-manager cert-manager-webhook-dnspod
E0528 12:28:58.992511  188344 memcache.go:255] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:28:58.994115  188344 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:28:58.996940  188344 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
E0528 12:28:58.998950  188344 memcache.go:106] couldn't get resource list for cert-manager.io/v1alpha1: the server is currently unable to handle the request
endpoints "cert-manager-webhook-dnspod" deleted

再次查看，未发现系统报错，问题解决。

[root@app1 ~]# kubectl get pod
NAME                                      READY   STATUS    RESTARTS        AGE
sleep-577dfc8474-5rq54                    1/1     Running   1 (3h58m ago) 125d
spring-boot-helloworld-6985c7f8bb-rmd4h   1/1     Running   1 (3h58m ago) 125d