Ubuntu 20.04
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Kubernetes : Configure Worker Node2020/08/19

Install Kubeadm to Configure Multi Nodes Kubernetes Cluster.
This example is based on the emvironment like follows.
           |                           |                          |
       eth0|              eth0|             eth0|
+----------+-----------+   +-----------+----------+   +-----------+----------+
|   [ dlp.srv.world ]  |   | [ node01.srv.world ] |   | [ node02.srv.world ] |
|      Master Node     |   |      Worker Node     |   |      Worker Node     |
+----------------------+   +----------------------+   +----------------------+

[2] Join in Kubernetes Cluster which is initialized on Master 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 2ai7nw.g02n51jp4ak0i63j \
--discovery-token-ca-cert-hash sha256:19d10da61c574672cb292f33c56d246da8615d29bbf9cbf2d7152140caa27e8b

W0818 14:31:16.039489    6363 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[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 -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace
[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 [This node has joined the cluster] is shown

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

NAME               STATUS   ROLES    AGE    VERSION
dlp.srv.world      Ready    master   14m    v1.18.8
node01.srv.world   Ready    <none>   113s   v1.18.8
node02.srv.world   Ready    <none>   33s    v1.18.8
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