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%