Shulou(Shulou.com)06/02 Report--

Delete the node node in the existing K8s cloud platform by mistake, and then add the deleted node to the cluster. If it is a new server, you must also install docker and K8s basic components.

1. View the number of nodes and delete node nodes (master nodes)

[root@k8s01 ~] # kubectl get nodes

NAME STATUS ROLES AGE VERSION

K8s01 Ready master 40d v1.15.3

K8s02 Ready 40d v1.15.3

K8s03 Ready 40d v1.15.3

[root@k8s01 ~] # kubectl delete nodes k8s03

Node "k8s03" deleted

[root@k8s01 ~] # kubectl get nodes

NAME STATUS ROLES AGE VERSION

K8s01 Ready master 40d v1.15.3

K8s02 Ready 40d v1.15.3

[root@k8s01 ~] #

two。 Clear the cluster information on the deleted node node

[root@k8s03 ~] # kubeadm reset

[reset] WARNING: Changes made to this host by 'kubeadm init' or' kubeadm join' will be reverted.

[reset] Are you sure you want to proceed? [y/N]: y

[preflight] Running pre-flight checks

W1017 15:43:41.491522 3010 removeetcdmember.go:79] [reset] No kubeadm config, using etcd pod spec to get data directory

[reset] No etcd config found. Assuming external etcd

[reset] Please, manually reset etcd to prevent further issues

[reset] Stopping the kubelet service

[reset] Unmounting mounted directories in "/ var/lib/kubelet"

[reset] Deleting contents of config directories: [/ etc/kubernetes/manifests / etc/kubernetes/pki]

[reset] Deleting files: [/ etc/kubernetes/admin.conf / etc/kubernetes/kubelet.conf / etc/kubernetes/bootstrap-kubelet.conf / etc/kubernetes/controller-manager.conf / etc/kubernetes/scheduler.conf]

[reset] Deleting contents of stateful directories: [/ var/lib/kubelet / etc/cni/net.d / var/lib/dockershim / var/run/kubernetes] The reset process does not reset or clean up iptables rules or IPVS tables.

If you wish to reset iptables, you must do so manually.

For example:

Iptables-F & & iptables-t nat-F & & iptables-t mangle-F & & iptables-X If your cluster was setup to utilize IPVS, run ipvsadm-- clear (or similar)

To reset your system's IPVS tables.

The reset process does not clean your kubeconfig files and you must remove them manually.

Please, check the contents of the $HOME/.kube/config file.

[root@k8s03 ~] #

3. Check the token value of the cluster on the master node

[root@k8s01] # kubeadm token create-- print-join-command

Kubeadm join 192.168.54.128Viru 6443-token mg4o13.4ilr1oi605tj850w-discovery-token-ca-cert-hash sha256:363b5b8525ddb86f4dc157f059e40c864223add26ef53d0cfc9becc3cbae8ad3

[root@k8s01 ~] #

4. Add the node node back to the k8s cluster

[root@k8s03] # kubeadm join 192.168.54.128 token mg4o13.4ilr1oi605tj850w 6443-- discovery-token-ca-cert-hash sha256:363b5b8525ddb86f4dc157f059e40c864223add26ef53d0cfc9becc3cbae8ad3

[preflight] Running pre-flight checks

WARNING IsDockerSystemdCheck: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/

[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 19.03.2. Latest validated version: 18.09

[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-1.15" 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] Activating the kubelet service

[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.

[root@k8s03 ~] #

5. View the status of the entire cluster

[root@k8s01 ~] # kubectl get nodes

NAME STATUS ROLES AGE VERSION

K8s01 Ready master 40d v1.15.3

K8s02 Ready 40d v1.15.3

K8s03 Ready 41s v1.15.3

[root@k8s01 ~] #

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