2.5 KiB
2.5 KiB
Synopsis
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?
- It is a Secret in the kube-system namespace of type "bootstrap.kubernetes.io/token".
- A bootstrap token must be of the form "[a-z0-9]{6}.[a-z0-9]{16}". The former part is the public token ID, while the latter is the Token Secret and it must be kept private at all circumstances!
- The name of the Secret must be named "bootstrap-token-(token-id)".
You can read more about bootstrap tokens here: https://kubernetes.io/docs/admin/bootstrap-tokens/
kubeadm token [flags]
Options
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<td colspan="2">--dry-run</td>
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<td></td><td style="line-height: 130%; word-wrap: break-word;">Whether to enable dry-run mode or not</td>
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<td colspan="2">-h, --help</td>
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<td></td><td style="line-height: 130%; word-wrap: break-word;">help for token</td>
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<td colspan="2">--kubeconfig string Default: "/etc/kubernetes/admin.conf"</td>
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<td></td><td style="line-height: 130%; word-wrap: break-word;">The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file.</td>
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Options inherited from parent commands
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<td colspan="2">--rootfs string</td>
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<td></td><td style="line-height: 130%; word-wrap: break-word;">[EXPERIMENTAL] The path to the 'real' host root filesystem.</td>
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