Manage bootstrap tokens.
This command manages bootstrap tokens. It is optional and needed only for advanced use cases.
In short, bootstrap tokens are used for establishing bidirectional trust between a client and a server. A bootstrap token can be used when a client (for example a node that is about to join the cluster) needs to trust the server it is talking to. Then a bootstrap token with the “signing” usage can be used. bootstrap tokens can also function as a way to allow short-lived authentication to the API Server (the token serves as a way for the API Server to trust the client), for example for doing the TLS Bootstrap.
What is a bootstrap token more exactly?
You can read more about bootstrap tokens here: https://kubernetes.io/docs/admin/bootstrap-tokens/
kubeadm token [flags]
--dry-run Whether to enable dry-run mode or not -h, --help help for token --kubeconfig string The KubeConfig file to use when talking to the cluster (default "/etc/kubernetes/admin.conf")