Kubernetes : Configure Worker Node2025/01/22 |
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Configure Multi Nodes Kubernetes Cluster. This example is based on the environment like follows.
+----------------------+ +----------------------+
| [ 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 |
+----------------------+ +----------------------+
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| [1] | |
| [2] | Join in Kubernetes Cluster which is initialized on Control Plane Node. The command for joining is just the one [kubeadm join ***] which was shown on the bottom of the results on initial setup of Cluster. |
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# if Firewalld is running, allow services [root@node01 ~]# firewall-cmd --add-service={kube-nodeport-services,kubelet,kubelet-readonly} success [root@node01 ~]# firewall-cmd --add-port={179/tcp,4789/udp} success [root@node01 ~]# firewall-cmd --add-masquerade success [root@node01 ~]# firewall-cmd --runtime-to-permanent success kubeadm join 10.0.0.25:6443 --token 6ccfpo.ycmm831uit8qfxcr \ --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 501.126429ms [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. # OK if [This node has joined the cluster] |
| [3] | Verify Status on Manager Node or Client Hosts you did setup cluster admin file. That's Ok if all STATUS are Ready. |
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[root@ctrl ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION dlp.srv.world Ready control-plane 6m25s v1.31.5 node01.srv.world Ready <none> 88s v1.31.5 node02.srv.world Ready <none> 33s v1.31.5 |
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