The simplest way to run it (note: --net=host gives your container full access to the host's system services):
docker run --rm -it --net=host gesellix/mountebank
A more secure approach with explicit port mappings:
docker run --rm -it -p 2525:2525 gesellix/mountebank
You should always prefer an explicit image tag, see the Docker Hub (gesellix/mountebank) for a list of available tags.
More details about mountebank and its configuration can be found at the official web page https://www.mbtest.org.
docker pull gesellix/mountebank