Renew the certificate for serving etcd.
Renewals run unconditionally, regardless of certificate expiration date; extra attributes such as SANs will be based on the existing file/certificates, there is no need to resupply them.
Renewal by default tries to use the certificate authority in the local PKI managed by kubeadm; as alternative it is possible to use K8s certificate API for certificate renewal, or as a last option, to generate a CSR request.
After renewal, in order to make changes effective, is required to restart control-plane components and eventually re-distribute the renewed certificate in case the file is used elsewhere.
kubeadm alpha certs renew etcd-server [flags]
|--cert-dir string Default: "/etc/kubernetes/pki"|
|The path where to save the certificates|
|Path to a kubeadm configuration file.|
|The path to output the CSRs and private keys to|
|Create CSRs instead of generating certificates|
|help for etcd-server|
|--kubeconfig string Default: "/etc/kubernetes/admin.conf"|
|The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file.|
|Use the Kubernetes certificate API to renew certificates|
|[EXPERIMENTAL] The path to the 'real' host root filesystem.|
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