FROM ubuntu:16.04

EXPOSE 5000
CMD ["some", "app"]

version: '2.3'

services:
  app:
    build:
      context: .
    exposes:
      - 6000

CONTAINER ID        NAMES      STATUS              CREATED             PORTS
3315ec1be1b3        app        Up 41 hours         41 hours ago        5000/tcp, 6000/tcp