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Add some details about certs #12579

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Feb 17, 2019
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Add some details about certs #12579

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4 changes: 3 additions & 1 deletion content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-certs.md
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Expand Up @@ -23,7 +23,9 @@ You should be familiar with [PKI certificates and requirements in Kubernetes](/d

## Renew certificates with the certificates API

Kubeadm can renew certificates with the `kubeadm alpha certs renew` commands.
The Kubernetes certificates normally reach their expiration date after one year.

Kubeadm can renew certificates with the `kubeadm alpha certs renew` commands; you should run these commands on control-plane nodes only.

Typically this is done by loading on-disk CA certificates and keys and using them to issue new certificates.
This approach works well if your certificate tree is self-contained. However, if your certificates are externally
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