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Collect metrics from edge

Enable kubectl logs/exec feature​

Refer to this doc.

Deploy metrics server​

Here we use v0.4.1 metrics-server, please use v0.4.0+ version since it supports automatic port identification after v0.4.0.

v0.4.1 have fixed a harmless stack dump error, details see this pr.

Download Configuration​

$ wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.4.0/components.yaml -O deploy.yaml

Update Deploy Configuration​

Update deploy.yaml as below:

  • Add affinity and tolerations configuration:

    spec:
      template:
        spec:
          affinity:
            nodeAffinity:
              requiredDuringSchedulingIgnoredDuringExecution:
                nodeSelectorTerms:
                - matchExpressions:
                  - key: node-role.kubernetes.io/master
                    operator: Exists
          tolerations:
          - key: node-role.kubernetes.io/master
            operator: Exists
            effect: NoSchedule

  • Enable hostnetwork mode:

    spec:
      template:
        spec:
          hostNetwork: true

  • Skip tls insecure:

    spec:
      template:
        spec:
          containers:
          - args:
            - --kubelet-insecure-tls

Deploy​

$ kubectl apply -f deploy.yaml
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created

Test​

$ kubectl top node

It would output all nodes as following:

NAME                 CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
edge-node            1169m        29%    3605Mi          45%
test-control-plane   121m         3%     664Mi           8%