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Monitoring K8S resources

metrics-server

metrics-server collects the cluster-wide metrics from kubelet on each node, and expose them in the K8S apiserver through Metrics API.

metrics-server is not built-in, you have to deploy it. Github: https://github.com/kubernetes-sigs/metrics-server

Deploy metrics-server on K8S cluster

  • Before metrics-server is deployed, you could not get anything back from kubectl top
ubuntu@control:~$ kubectl top node control
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)
ubuntu@control:~$ kubectl top pod static-nginx-worker-4
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

  • Deplopy metrics-server

    • kubectl apply <components.yaml which is downloaded from above link>

  • Run kubectl top nodes

ubuntu@control:~/monitoring$ kubectl top nodes
NAME       CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
control    343m         17%    1186Mi          62%
worker-0   126m         6%     641Mi           16%
worker-1   120m         6%     970Mi           25%
worker-2   108m         5%     746Mi           19%

Deploy kube-state-metrics