You must start the catalog service manually when you are using a distributed WebSphere® eXtreme Scale environment that is not running in WebSphere Application Server.
The catalog service can run in a single process or can include multiple catalog servers to form a catalog service domain. A catalog service domain is required in a production environment for high availability. For more information, see High availability catalog service. You can also specify additional parameters to the script to bind the transport to a specific host and port, specify the domain, or enable security.