如何获取 Kubernetes 中 Pod 的资源使用情况？

Question

我们如何通过命令行获取 Kubernetes 上每个 pod 的真实资源使用情况（不是资源请求）？ 不推荐使用 Heapster。 同时，Metrics-server 仍然不支持kubectl top pod。

1. Heapster -

   我使用以下命令部署了 Heapster

   $ heapster/deploy/kube.sh start
   kubectl get pods --all-namespaces
   NAMESPACE     NAME                                                           READY     STATUS    RESTARTS   AGE
   kube-system   calico-node-hlcbl                                              2/2       Running   0          39m
   kube-system   calico-node-m8jl2                                              2/2       Running   0          35m
   kube-system   coredns-78fcdf6894-bl94w                                       1/1       Running   0          39m
   kube-system   coredns-78fcdf6894-fwx95                                       1/1       Running   0          39m
   kube-system   etcd-ctl.kube.yarnrm-pg0.utah.cloudlab.us                      1/1       Running   0          39m
   kube-system   heapster-84c9bc48c4-qzt8x                                      1/1       Running   0          15s
   kube-system   kube-apiserver-ctl.kube.yarnrm-pg0.utah.cloudlab.us            1/1       Running   0          39m
   kube-system   kube-controller-manager-ctl.kube.yarnrm-pg0.utah.cloudlab.us   1/1       Running   0          38m
   kube-system   kube-proxy-nj9f8                                               1/1       Running   0          35m
   kube-system   kube-proxy-zvr2b                                               1/1       Running   0          39m
   kube-system   kube-scheduler-ctl.kube.yarnrm-pg0.utah.cloudlab.us            1/1       Running   0          39m
   kube-system   monitoring-grafana-555545f477-jldmz                            1/1       Running   0          15s
   kube-system   monitoring-influxdb-848b9b66f6-k2k4f                           1/1       Running   0          15s
   

   我在使用kubectl top时遇到如下错误。

   $ kubectl top pods
   Error from server (ServiceUnavailable): the server is currently unable to handle the request (get services http:heapster:)
   $ kubectl top nodes
   Error from server (ServiceUnavailable): the server is currently unable to handle the request (get services http:heapster:)
   

2. 指标服务器：

   metrics-server 不支持 kubectl top Resource Metrics API

如果有人已经解决了同样的问题，请帮助我。 谢谢。

Answer 1

来自服务器的错误（ServiceUnavailable）：服务器当前无法处理请求（获取服务 http:heapster:)

听起来 heapster 部署只是忘记为heapster 安装Service；我希望这会让你摆脱那个错误，但不知道它是否真的会导致kubectl top pods开始工作：

kubectl create -f /dev/stdin <<SVC
apiVersion: v1
kind: Service
metadata:
  name: heapster
  namespace: kube-system
spec:
  selector:
    whatever-label: is-on-heapster-pods
  ports:
  - name: http
    port: 80
    targetPort: whatever-is-heapster-is-listening-on
SVC