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Kubernetes : Metrics Server の設定2025/05/20

 

Metrics Server を設定して、Kubernetes クラスターの CPU/メモリー リソースのメトリクスを収集/監視します。

当例では以下のように 4 台のノードを使用して Kubernetes クラスターを構成しています。

+----------------------+   +----------------------+
|  [ ctrl.srv.world ]  |   |   [ dlp.srv.world ]  |
|     Manager Node     |   |     Control Plane    |
+-----------+----------+   +-----------+----------+
        eth0|10.0.0.25             eth0|10.0.0.30
            |                          |
------------+--------------------------+-----------
            |                          |
        eth0|10.0.0.51             eth0|10.0.0.52
+-----------+----------+   +-----------+----------+
| [ node01.srv.world ] |   | [ node02.srv.world ] |
|     Worker Node#1    |   |     Worker Node#2    |
+----------------------+   +----------------------+

[1] Metrics Server を設定します。
[cent@ctrl ~]$
git clone https://github.com/kubernetes-sigs/metrics-server

[cent@ctrl ~]$
vi ./metrics-server/manifests/base/deployment.yaml
.....
.....
      containers:
      - name: metrics-server
        image: gcr.io/k8s-staging-metrics-server/metrics-server:master
        imagePullPolicy: IfNotPresent
        args:
          - --cert-dir=/tmp
          - --secure-port=10250
          - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
          - --kubelet-use-node-status-port
          - --metric-resolution=15s
          # 29行目 : 追記
          - --kubelet-insecure-tls

[cent@ctrl ~]$
kubectl apply -k ./metrics-server/manifests/base/

# Warning: 'commonLabels' is deprecated. Please use 'labels' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
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

[cent@ctrl ~]$
kubectl get pods -n kube-system

NAME                                       READY   STATUS    RESTARTS   AGE
calico-kube-controllers-64c678449f-bts57   1/1     Running   2          3h40m
calico-node-9pl4d                          1/1     Running   3          3h35m
calico-node-dc9mt                          1/1     Running   2          3h36m
calico-node-n8szh                          1/1     Running   2          3h40m
coredns-7c65d6cfc9-j7jb5                   1/1     Running   2          3h41m
coredns-7c65d6cfc9-jxvwr                   1/1     Running   2          3h41m
etcd-dlp.srv.world                         1/1     Running   2          3h41m
kube-apiserver-dlp.srv.world               1/1     Running   2          3h41m
kube-controller-manager-dlp.srv.world      1/1     Running   2          3h41m
kube-proxy-lk27c                           1/1     Running   2          3h35m
kube-proxy-wx6nm                           1/1     Running   2          3h41m
kube-proxy-xfjd8                           1/1     Running   2          3h36m
kube-scheduler-dlp.srv.world               1/1     Running   2          3h41m
metrics-server-75c666cb86-tlkhw            1/1     Running   0          31s
# [metrics-server] pod が新規にデプロイされる
[2] CPU や メモリー の使用状況は以下のように確認できます。
[cent@ctrl ~]$
kubectl top node

NAME               CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
dlp.srv.world      67m          0%     1831Mi          11%
node01.srv.world   32m          0%     1088Mi          6%
node02.srv.world   30m          0%     1155Mi          7%

[cent@ctrl ~]$
kubectl top pod -n kube-system

NAME                                       CPU(cores)   MEMORY(bytes)
calico-kube-controllers-64c678449f-bts57   2m           102Mi
calico-node-9pl4d                          17m          199Mi
calico-node-dc9mt                          17m          199Mi
calico-node-n8szh                          15m          196Mi
coredns-7c65d6cfc9-j7jb5                   1m           17Mi
coredns-7c65d6cfc9-jxvwr                   1m           74Mi
etcd-dlp.srv.world                         7m           108Mi
kube-apiserver-dlp.srv.world               15m          382Mi
kube-controller-manager-dlp.srv.world      5m           148Mi
kube-proxy-lk27c                           1m           88Mi
kube-proxy-wx6nm                           1m           88Mi
kube-proxy-xfjd8                           1m           88Mi
kube-scheduler-dlp.srv.world               1m           83Mi
metrics-server-75c666cb86-tlkhw            3m           22Mi
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