OptionalCACertThe root CA certificate (in PEM format) this external CA uses to issue TLS certificates (assumed to be to the current swarm root CA certificate if not provided).
OptionalOptionsAn object with key/value pairs that are interpreted as protocol-specific options for the external CA driver.
OptionalProtocolProtocol for communication with the external CA (currently only cfssl is supported).
OptionalURLURL where certificate signing requests should be sent.
SwarmSpecCAConfigExternalCAsInner