Kubernetes : Worker ノードを追加する2025/05/20 |
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既存の Kubernetes クラスターに Worker ノードを新規に追加する場合は以下のように設定します。
当例では以下のように 4 台のノードを使用して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] |
新規に追加するノードで、こちらを参考に、ノード共通の設定を適用しておきます。 |
| [2] | Control Plane ノードで認証トークンを確認します。 |
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[root@dlp ~]# kubeadm token create --print-join-command kubeadm join 10.0.0.25:6443 --token 0ocigo.5qnqgk0l36pjuhgq --discovery-token-ca-cert-hash sha256:f7ed0f751e3370eb32367ee7b38ec48c5e48a997ca6935045b573c3b57df5b3e |
| [3] | 新規に追加するノードで、Control Plane ノードで確認した認証トークン用コマンドを実行します。 |
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[root@node03 ~]# kubeadm join 10.0.0.25:6443 --token 1303q4.vioahp3nqt51kjp5 \ --discovery-token-ca-cert-hash sha256:17b33be257174fc86fa06066a5ebdbdb84d9b397f86d893a54d328ac3a1a44dd [preflight] Running pre-flight checks [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml' [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Starting the kubelet [kubelet-check] Waiting for a healthy kubelet at http://127.0.0.1:10248/healthz. This can take up to 4m0s [kubelet-check] The kubelet is healthy after 11.002305353s [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster. |
| [4] | Manager ノードでノード情報を確認しておきます。新規追加ノードが STATUS = Ready であれば OK です。 |
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[root@ctrl ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION dlp-1.srv.world Ready control-plane 117m v1.31.9 dlp.srv.world Ready control-plane 3h3m v1.31.9 node01.srv.world Ready <none> 178m v1.31.9 node02.srv.world Ready <none> 177m v1.31.9 node03.srv.world Ready <none> 38s v1.31.9[root@ctrl ~]# kubectl get pods -A -o wide | grep node03 kube-system calico-node-5xs5m 1/1 Running 0 83s 10.0.0.53 node03.srv.world <none> <none> kube-system kube-proxy-bv5f2 1/1 Running 0 83s 10.0.0.53 node03.srv.world <none> <none> |
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