Kubernetes : Add Worker Nodes2023/10/19 |
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Add new Worker Nodes to existing Kubernetes Cluster.
This example is based on the cluster environment like follows.
+----------------------+ +----------------------+
| [ mgr.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] |
On a new Node, Configure common settings to join in Cluster, refer to here. |
| [2] | Confirm join command on Control Plane Node. |
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[root@dlp ~]# kubeadm token create --print-join-command kubeadm join 10.0.0.25:6443 --token 5f90le.v0jciitymf7j19jl --discovery-token-ca-cert-hash sha256:8a8bd725c9cbf8d03c0a724bded0afb923a067d48ca50fd8f0346fd3d0a27b6e |
| [3] | Run join command on a new Node. |
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[root@node03 ~]# kubeadm join 10.0.0.25:6443 --token 5f90le.v0jciitymf7j19jl \ --discovery-token-ca-cert-hash sha256:8a8bd725c9cbf8d03c0a724bded0afb923a067d48ca50fd8f0346fd3d0a27b6e [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... [ 432.883160] Warning: Deprecated Driver is detected: iptables will not be maintained in a future major release and may be disabled [ 432.921296] Warning: Deprecated Driver is detected: ip6tables will not be maintained in a future major release and may be disabled 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] | Verify settings on Manager Node. That's OK if the status of new Node turns to [STATUS = Ready]. |
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[root@mgr ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION dlp-1.srv.world Ready control-plane 22m v1.28.2 dlp.srv.world Ready control-plane 4h4m v1.28.2 node01.srv.world Ready <none> 3h v1.28.2 node02.srv.world Ready <none> 178m v1.28.2 node03.srv.world Ready <none> 95s v1.28.2[root@mgr ~]# kubectl get pods -A -o wide | grep node03 kube-system calico-node-fqf2f 1/1 Running 0 2m55s 10.0.0.53 node03.srv.world <none> <none> kube-system kube-proxy-rlcbx 1/1 Running 0 2m55s 10.0.0.53 node03.srv.world <none> <none> |
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