最近才知道 kubectl top 並不是天生就可以用的，需要另外安裝 metrics-server。

Install

直接 apply 最新版的 metrics-server

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kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

看看服務有沒有跑起來

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kubectl logs -n kube-system -l k8s-app=metrics-server
kubectl top po -A

疑難排解

Error: x509: cannot validate certificate

  1. edit deployment/metrics-server
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kubectl edit deployment -n kube-system metrics-server
  1. add - --kubelet-insecure-tls to args:
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spec:
  containers:
  - args:
    - --cert-dir=/tmp
    - --secure-port=4443
    - --kubelet-insecure-tls
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --kubelet-use-node-status-port
    image: k8s.gcr.io/metrics-server/metrics-server:v0.4.1
    imagePullPolicy: IfNotPresent

refs.