kubeadm: deprecate the flag --use-api for cert renewal #88827
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The KCM is moving to means of only singing apiserver (kubelet) client and kubelet serving certificates. See: https://github.com/kubernetes/enhancements/blob/master/keps/sig-auth/20190607-certificates-api.md#signers Up until now the experimental kubeadm functionality '--use-api' under "kubeadm alpha certs renew" was using the KCM to sign *any* certficate as long as the KCM has the root CA cert/key. Post discussions with the kubeadm maintainers, it was decided that this functionality should be removed from kubeadm due to the requirement to have external signers for renewing the common control-plane certificates that kubeadm manages.
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What this PR does / why we need it:
The KCM is moving to means of only singing apiserver (kubelet) client
and kubelet serving certificates. See:
https://github.com/kubernetes/enhancements/blob/master/keps/sig-auth/20190607-certificates-api.md#signers
Up until now the experimental kubeadm functionality '--use-api'
under "kubeadm alpha certs renew" was using the KCM to sign any
certficate as long as the KCM has the root CA cert/key.
Post discussions with the kubeadm maintainers, it was decided that
this functionality should be removed from kubeadm due to the
requirement to have external signers for renewing the common
control-plane certificates that kubeadm manages.
Which issue(s) this PR fixes:
ref kubernetes/kubeadm#2047
Special notes for your reviewer:
NONE
Does this PR introduce a user-facing change?:
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
/assign @fabriziopandini @rosti
/kind deprecation
/priority important-soon