Q: Kubernetes cluster name change I'm creating a cluster with kubeadm init --with-stuff (Kubernetes 1.8.4, for reasons). I can setup nodes, weave, etc. But I have a problem setting the cluster name. When I open the admin.conf or a different config file I see:
name: kubernetes

When I run kubectl config get-clusters:
NAME
kubernetes

Which is the default. Is there a way to set the cluster name during init (there is no command line parameter)? Or is there a way to change this after the init? The current name is referenced in many files in /etc/kubernetes/
Best Regrads
Kamil

A: You can now do so using kubeadm's config file. PR here:
https://github.com/kubernetes/kubernetes/pull/60852
Using the kubeadm config you just set the following at the top level
clusterName: kubernetes


A: No, you cannot change a name of running cluster, because it serves for discovery inside a cluster and this would require near-simultaneous changing it across the cluster.
Sadly, you also cannot change a name of the cluster before init. Here is the issue on Github.
Update: From version 1.12, kubeadm allow you to change a cluster name before an "init" stage.
To do it (for sure for versions >=1.15, for lower versions commands can be different, commands changed somewhen between versions 1.12 and 1.15), you need to set clusterName value in a cluster configuration file like that:


*

*Save default configuration to a file (cluster config is optional, so we need to do that step first for not to write it from scratch) by a kubeadm config print init-defaults < init-config.yaml command.

*Set  clusterName value in the config.

*Run kubeadm init with a config argument: kubeadm init --config init-config.yaml
