Document how to use Kubernetes with a custom certificate authority

[sdputurn]

What would you like to be added?

i would like k8s to use custom CA and it's key to sign certificates for apiserver, controller-manager, scheduler, kubelet etc.. and also sign CSR's.

i have checked the docs - https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-certs/#external-ca-mode

1. where it says to use external CA signed certificate for the server and add trust this CA in k8s(but this will k8s will not be able to sign CSR's)
2. it also says run the controller-manager standalone with --controllers=csrsigner and point to the CA certificate and key, but does not more details

we are looking at option 2. but the doc does not explain it well if this the option to use external CA and key to use for k8s.

thanks,
Sandeep

Why is this needed?

currently we have multiple cluster and every cluster usages it own CA for certificate management. Our scanning tools reports them as unknown CA. So we end up having so many CA to trust in scanning tool. we want to use a custom CA and use this CA cert and key in our k8s cluster.

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[sdputurn]

wg /policy

[sftim]

This might be a documentation request. I think it is.

/retitle Document how to use Kubernetes with a custom certificate authority

[sftim]

/transfer website

[sftim]

/sig docs
/sig security
/sig auth

[aramase]

/triage accepted

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/remove-triage accepted

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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