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changing_node_hostname.rst

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Changing the hostname of a MetalK8s node

  1. On the node, change the hostname:

    $ hostnamectl set-hostname <New hostname>
$ systemctl restart systemd-hostnamed

  2. Check that the change is taken into account.

    $ hostnamectl status

Static hostname: <New hostname>
Pretty hostname: <New hostname>
  Icon name: computer-vm
   Chassis: vm
Machine ID: 5003025f93c1a84914ea5ae66519c100
   Boot ID: f28d5c64f06c48a3a775e24c4f03d00c
   Virtualization: kvm
Oerating System: CentOS Linux 7 (Core)
   CPE OS Name: cpe:/o:centos:centos:7
       Kernel: Linux 3.10.0-957.12.2.el7.x86_64
   Architecture: x86-64

  3. On the bootstrap node, check the hostname edition incurred a change of status on the bootstrap. The edited node must be in a NotReady status.

    $ kubectl get <node_name>
<node_name>    NotReady   etcd,master                   19h       v1.11.7

  4. Change the name of the node in the yaml file used to create it. Refer to installation-expansion-manifest for more information.

    apiVersion: v1 kind: Node metadata: name: <New_node_name> annotations: metalk8s.scality.com/ssh-key-path: /etc/metalk8s/pki/salt-bootstrap metalk8s.scality.com/ssh-host: <node control-plane IP> metalk8s.scality.com/ssh-sudo: 'false' labels: metalk8s.scality.com/version: '' <role labels> spec: taints: <taints>

    Then apply the configuration:

    $ kubectl apply -f <path to edited manifest>

  5. Delete the old node (here <node_name>):

    $ kubectl delete node <node_name>

  6. Open a terminal into the Salt Master container:

    $ kubectl -it exec salt-master-<bootstrap_node_name> -n kube-system -c salt-master bash

  7. Delete the now obsolete Salt Minion key for the changed Node:

    $ salt-key -d <node_name>

  8. Re-run the deployment for the edited Node:

    $ salt-run state.orchestrate metalk8s.orchestrate.deploy_node saltenv=metalk8s- pillar='{"orchestrate": {"node_name": "<new-node-name>"}}'

    Summary for bootstrap_master -------------Succeeded: 11 (changed=9) Failed: 0 -------------Total states run: 11 Total run time: 132.435 s

  9. On the edited node, restart the Kubelet service:

    $ systemctl restart kubelet