Generate certificate keys
This command will print out a secure randomly-generated certificate key that can be used with the “init” command.
You can also use “kubeadm init –experimental-upload-certs” without specifying a certificate key and it will generate and print one for you.
kubeadm alpha certs certificate-key [flags]
-h, --help help for certificate-key
--rootfs string [EXPERIMENTAL] The path to the 'real' host root filesystem.
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