Kubernetes kubectl top 命令报 error: Metrics API not available

环境

minikube

错误详情

PS C:\Users\fendoudebb> kubectl top node
error: Metrics API not available

原因

未启用metrics-server插件

查看插件列表

minikube addons list

输出：可以看到metrics-server是disabled状态

PS C:\Users\fendoudebb> minikube addons list
|-----------------------------|----------|--------------|--------------------------------|
|         ADDON NAME          | PROFILE  |    STATUS    |           MAINTAINER           |
|-----------------------------|----------|--------------|--------------------------------|
| ambassador                  | minikube | disabled     | third-party (ambassador)       |
| auto-pause                  | minikube | disabled     | google                         |
| csi-hostpath-driver         | minikube | disabled     | kubernetes                     |
| dashboard                   | minikube | enabled ✅   | kubernetes                     |
| default-storageclass        | minikube | enabled ✅   | kubernetes                     |
| efk                         | minikube | disabled     | third-party (elastic)          |
| freshpod                    | minikube | disabled     | google                         |
| gcp-auth                    | minikube | disabled     | google                         |
| gvisor                      | minikube | disabled     | google                         |
| helm-tiller                 | minikube | disabled     | third-party (helm)             |
| ingress                     | minikube | disabled     | unknown (third-party)          |
| ingress-dns                 | minikube | disabled     | google                         |
| istio                       | minikube | disabled     | third-party (istio)            |
| istio-provisioner           | minikube | disabled     | third-party (istio)            |
| kubevirt                    | minikube | disabled     | third-party (kubevirt)         |
| logviewer                   | minikube | disabled     | unknown (third-party)          |
| metallb                     | minikube | disabled     | third-party (metallb)          |
| metrics-server              | minikube | disabled     | kubernetes                     |
| nvidia-driver-installer     | minikube | disabled     | google                         |
| nvidia-gpu-device-plugin    | minikube | disabled     | third-party (nvidia)           |
| olm                         | minikube | disabled     | third-party (operator          |
|                             |          |              | framework)                     |
| pod-security-policy         | minikube | disabled     | unknown (third-party)          |
| portainer                   | minikube | disabled     | portainer.io                   |
| registry                    | minikube | disabled     | google                         |
| registry-aliases            | minikube | disabled     | unknown (third-party)          |
| registry-creds              | minikube | disabled     | third-party (upmc enterprises) |
| storage-provisioner         | minikube | enabled ✅   | google                         |
| storage-provisioner-gluster | minikube | disabled     | unknown (third-party)          |
| volumesnapshots             | minikube | disabled     | kubernetes                     |
|-----------------------------|----------|--------------|--------------------------------|

启用插件

minikube addons enable metrics-server

输出

PS C:\Users\fendoudebb> minikube addons enable metrics-server
    ▪ Using image registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.4.2
🌟  启动 'metrics-server' 插件

查看插件创建的控制器和服务

可以看到metrics-server创建了名为metrics-server-96bbfd9f5-mfm7t的Pod和metrics-server的Service。

PS C:\Users\fendoudebb> kubectl get pod,svc -n kube-system
NAME                                   READY   STATUS    RESTARTS       AGE
pod/coredns-65c54cc984-rf6t5           1/1     Running   2              14d
pod/etcd-minikube                      1/1     Running   0              2d16h
pod/kube-apiserver-minikube            1/1     Running   0              2d16h
pod/kube-controller-manager-minikube   1/1     Running   1              14d
pod/kube-proxy-t6wjm                   1/1     Running   1              14d
pod/kube-scheduler-minikube            1/1     Running   1              14d
pod/metrics-server-96bbfd9f5-mfm7t     1/1     Running   0              39s
pod/storage-provisioner                1/1     Running   11 (75m ago)   14d

NAME                     TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                  AGE
service/kube-dns         ClusterIP   10.96.0.10      <none>        53/UDP,53/TCP,9153/TCP   14d
service/metrics-server   ClusterIP   10.108.228.83   <none>        443/TCP                  39s

禁用插件

minikube addons disable metrics-server