I assume (!) that it depends on the trial license key whether the instance is in data center mode or not.
I start atlas-debug with a PostgresSQL database (started prior to Confluence). In this case I need to manually configure the installation (license, key, database, …) via the UI (I haven’t found out how to configure this in the POM). In this process I enter the test license.
If I enter the test license when started with the H2 database (the default database), I get the following error message: "
You’re using the embedded H2 database, which isn’t supported as a production database. You’ll need to migrate to a supported database before you can set up Data Center."
I have only one node configured, but the administration screen for clustering is present.
Hope this helps.