kubeadm-certs: fix wrong info about admin.conf #48095
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@@ -349,14 +349,24 @@ CSRs requesting serving certificates for any IP or domain name. | |
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| ## Generating kubeconfig files for additional users {#kubeconfig-additional-users} | ||
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| During cluster creation, `kubeadm init` signs the certificate in the `super-admin.conf` | ||
| to have `Subject: O = system:masters, CN = kubernetes-super-admin`. | ||
| [`system:masters`](/docs/reference/access-authn-authz/rbac/#user-facing-roles) | ||
| is a break-glass, super user group that bypasses the authorization layer (for example, | ||
| [RBAC](/docs/reference/access-authn-authz/rbac/)). The file `admin.conf` is also created | ||
| by kubeadm on control plane nodes and it contains a certificate with | ||
| `Subject: O = kubeadm:cluster-admins, CN = kubernetes-admin`. `kubeadm:cluster-admins` | ||
| is a group logically belonging to kubeadm. If your cluster uses RBAC | ||
| (the kubeadm default), the `kubeadm:cluster-admins` group is bound to the | ||
| [`cluster-admin`](/docs/reference/access-authn-authz/rbac/#user-facing-roles) ClusterRole. | ||
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| {{< warning >}} | ||
| Avoid sharing the `super-admin.conf` or `admin.conf` files. Instead, create least | ||
| privileged access even for people who work as administrators and use that least | ||
| privilege alternative for anything other than break-glass (emergency) access. | ||
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There was a problem hiding this comment. Okay. Please state what "least privilege alternative" means. Or else, this suggestion is not actionable. There was a problem hiding this comment. @sftim suggested this change. |
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| {{< /warning >}} | ||
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| You can use the [`kubeadm kubeconfig user`](/docs/reference/setup-tools/kubeadm/kubeadm-kubeconfig) | ||
| command to generate kubeconfig files for additional users. | ||
| The command accepts a mixture of command line flags and | ||
| [kubeadm configuration](/docs/reference/config-api/kubeadm-config.v1beta4/) options. | ||
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What does this mean?
kubeadmis a CLI tool. Why there is a group belonging to a tool?There was a problem hiding this comment.
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Some design details in https://github.com/kubernetes/enhancements/tree/master/keps/sig-cluster-lifecycle/kubeadm/4214-separate-super-user-kubeconfig#proposal.
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The "kubeadm:cluster-admins is a group logically belonging to kubeadm" statement is confusing. You can say that this group is created and used by kubeadm. Having a group belonging to a CLI tool is confusing.
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group is a term from rbac.