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Renew the certificate embedded in the kubeconfig file for the admin to use and for kubeadm itself

Synopsis

Renew the certificate embedded in the kubeconfig file for the admin to use and for kubeadm itself.

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 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 admin.conf [flags]

Options

      --cert-dir string     The path where to save the certificates (default "/etc/kubernetes/pki")
      --config string       Path to a kubeadm configuration file.
      --csr-dir string      The path to output the CSRs and private keys to
      --csr-only            Create CSRs instead of generating certificates
  -h, --help                help for admin.conf
      --kubeconfig string   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. (default "/etc/kubernetes/admin.conf")
      --use-api             Use the Kubernetes certificate API to renew certificates

Options inherited from parent commands

      --rootfs string   [EXPERIMENTAL] The path to the 'real' host root filesystem.

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