Kubernetes : Configure Worker Node2021/05/11

Install Kubeadm to Configure Multi Nodes Kubernetes Cluster.

This example is based on the environment like follows.

-----------+---------------------------+--------------------------+------------
           |                           |                          |
       eth0|10.0.0.30              eth0|10.0.0.51             eth0|10.0.0.52
+----------+-----------+   +-----------+----------+   +-----------+----------+
|   [ dlp.srv.world ]  |   | [ node01.srv.world ] |   | [ node02.srv.world ] |
|      Master Node     |   |      Worker Node     |   |      Worker Node     |
+----------------------+   +----------------------+   +----------------------+

[1]	Configure pre-requirements on all Nodes, refer to here.
[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.

[root@node01 ~]#

kubeadm join 10.0.0.30:6443 --token xme2jq.gb2sgglicnpqqshv \
--discovery-token-ca-cert-hash sha256:2f597590adfff75d6c1394cef5b5209b2e58f52c8c54b8a3630367ac3991fb59

[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 [This node has joined the cluster]

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

[root@dlp ~]#

kubectl get nodes

NAME               STATUS   ROLES                  AGE   VERSION
dlp.srv.world      Ready    control-plane,master   45m   v1.20.5
node01.srv.world   Ready    <none>                 21m   v1.20.5
node02.srv.world   Ready    <none>                 26s   v1.20.5

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