File containing the PEM formatted private key
--x509-private-key path
x509-private-key specifies the path to the
private-key. The key should be in PEM format.
If it is not configured, the server instance does not load the private key and the server-side certificates.
pathPath to the PEM formatted private key file. Relative and absolute paths are valid.
The instance loads the private key from private_key.pem which
is located at .instance_root/x509
--x509-private-key ./x509/private_key.pem