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kubeadm/create-cluster: add warning about admin.conf #27141

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kubeadm/create-cluster: add warning about admin.conf #27141

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7 changes: 7 additions & 0 deletions ...nt/en/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm.md
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Expand Up @@ -187,6 +187,13 @@ Alternatively, if you are the `root` user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
```

{{< warning >}}
Kubeadm signs the certificate in the `admin.conf` to have `Subject: O = system:masters, CN = kubernetes-admin`.
`system:masters` is a break-glass, super user group that bypasses the authorization layer (e.g. RBAC).
Do not share the `admin.conf` file with anyone and instead grant users custom permissions by generating
them a kubeconfig file using the `kubeadm kubeconfig user` command.
{{< /warning >}}

Make a record of the `kubeadm join` command that `kubeadm init` outputs. You
need this command to [join nodes to your cluster](#join-nodes).

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