This was all that appeared in the trace.log:
18-3-29 00:45:45.2|Debug|ProcessProvider|Found 0 processes with the name: NzbDrone.Console
18-3-29 00:45:45.3|Debug|ProcessProvider|Found 1 processes with the name: NzbDrone
18-3-29 00:45:45.3|Debug|ProcessProvider| - [19208] NzbDrone
18-3-29 00:45:45.3|Info|Router|Application mode: Interactive
18-3-29 00:45:45.3|Debug|Router|Tray selected
18-3-29 00:45:45.5|Info|MigrationLogger|*** Migrating data source=/root/.config/NzbDrone/nzbdrone.db;cache size=-10485760;datetimekind=Utc;journal mode=Wal;pooling=True;version=3 ***
18-3-29 00:45:45.7|Debug|MigrationLogger|Took: 00:00:00.1943686
18-3-29 00:45:45.7|Info|MigrationLogger|*** Migrating data source=/root/.config/NzbDrone/logs.db;cache size=-10485760;datetimekind=Utc;journal mode=Wal;pooling=True;version=3 ***
18-3-29 00:45:45.7|Debug|MigrationLogger|Took: 00:00:00.0241304
18-3-29 00:45:45.7|Info|OwinHostController|Listening on the following URLs:
18-3-29 00:45:45.7|Info|OwinHostController| http://*:8989/
18-3-29 00:45:45.8|Debug|OwinAppFactory|Attaching NzbDroneVersionMiddleWare to host
18-3-29 00:45:45.8|Debug|OwinAppFactory|Attaching SignalRMiddleWare to host
18-3-29 00:45:45.8|Debug|OwinAppFactory|Attaching NancyMiddleWare to host
18-3-29 00:45:45.9|Info|NancyBootstrapper|Starting Web Server
18-3-29 00:45:46.9|Fatal|ConsoleApp|Address already in use. This can happen if another instance of Sonarr is already running another application is using the same port (default: 8989) or the user has insufficient permissions
But like I said, it’s in its own container with a static IP. That’s the only thing running in that container.