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Kubernetes : Configure Worker2023/07/28


Install Kubeadm to Configure Multi Nodes Kubernetes Cluster.

This example is based on the environment like follows.

           |                           |                          |
       eth0|              eth0|             eth0|
+----------+-----------+   +-----------+-----------+   +-----------+-----------+
|  [ ]  |   |  []  |   |  []  |
|     Control Plane    |   |      Worker Node      |   |      Worker Node      |
+----------------------+   +-----------------------+   +-----------------------+

[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.
kubeadm join --token q1xuoi.v6meo9irmuv9g0y1 \
--discovery-token-ca-cert-hash sha256:1b96782423120e014e212197d34c56b029af1a8db85bf40a6602e19881bc7db1

[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-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 the message above is shown

[3] Verify Status on Control Plane Node. That's Ok if all STATUS are Ready.
kubectl get nodes

NAME                STATUS   ROLES           AGE     VERSION      Ready    control-plane   4h54m   v1.26.6   Ready    <none>          2m12s   v1.26.6   Ready    <none>          83s     v1.26.6
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