[CharlieDigital]

Hmm; at least in the more recent versions of .NET, Microsoft has really cleaned up the runtime host paradigm so that it's consistent across console (think background services, timer jobs, pull-oriented processing) and web (classic HTTP).

For us, it just becomes a matter of configuring the correct construction of the dependency injection container at host startup using some flag (usually environment variable) to pick the right bits and pieces to load into the container and which services to run from the monolith.

Then each of the host "partitions" gets its own Dockerfile.