I'm trying to create a Docker container that acts like a full-on virtual machine. I know I can use the EXPOSE instruction inside a Dockerfile to expose a port, and I can use the `-p` flag with `docker run` to assign ports, but once a container is actually running, is there a command to open/map additional ports live?

For example, let's say I have a Docker container that is running sshd. Someone else using the container ssh's in and installs httpd. Is there a way to expose port 80 on the container and map it to port 8080 on the host, so that people can visit the web server running in the container, without restarting it?