Not sure what you’re asking here? Tomcat is an application server (that can run on linux, or anywhere else) - but not sure how it relates?
As for publishing maps, they’re all configuration for the world builder. You can find the current worlds at boundless.worlds/config/worlds at master · monumentalco/boundless.worlds · GitHub. There isn’t much information (yet) on how private servers will be configured, but for some background on how they will be set up at a high level: